Enable libarchive wrt #147

Fix nancy
Fix ghcup upgrade if binary is in non-standard location
2021-06-13 21:29:00 +02:00 · 2021-06-13 19:29:25 +02:00 · 2021-06-13 15:08:31 +02:00 · 2021-06-13 15:05:39 +02:00 · 2021-06-13 14:43:00 +02:00 · 2021-06-13 14:15:48 +02:00
29 changed files with 935 additions and 549 deletions
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -66,6 +66,14 @@ variables:
    ARCH: "64"
    CABAL_DIR: "$CI_PROJECT_DIR/cabal"

+.darwin:aarch64:
+  tags:
+    - aarch64-darwin-m1
+  variables:
+    OS: "DARWIN"
+    ARCH: "ARM64"
+    CABAL_DIR: "$CI_PROJECT_DIR/cabal"
+
 .freebsd:
  tags:
    - x86_64-freebsd
@@ -133,6 +141,30 @@ variables:
  before_script:
    - ./.gitlab/before_script/darwin/install_deps.sh

+.test_ghcup_version:darwin:aarch64:
+  extends:
+    - .test_ghcup_version
+    - .darwin:aarch64
+    - .root_cleanup
+  script: |
+    set -Eeuo pipefail
+    function runInNixShell() {
+      time nix-shell .gitlab/shell.nix \
+        -I nixpkgs=https://github.com/angerman/nixpkgs/archive/75f7281738b.tar.gz \
+        --argstr system "x86_64-darwin" \
+        --pure \
+        --keep GHC_VERSION --keep CABAL_INSTALL_VERSION --keep BUILD_FLAVOUR \
+        --keep BIN_DIST_PREP_TAR_COMP --keep CPUS --keep PROJECT_DIR \
+        --keep CI_PROJECT_DIR --keep MAKE_ARGS --keep HADRIAN_ARGS --keep CABAL_CACHE \
+        --keep LANG --keep CONFIGURE_ARGS --keep TEST_ENV --keep BIN_DIST_NAME \
+        --keep MACOSX_DEPLOYMENT_TARGET --keep ac_cv_func_clock_gettime --keep HACKAGE_INDEX_STATE \
+        --keep CABAL_DIR --keep ARCH --keep OS --keep CABAL_VERSION --keep GHC_VERSION \ 
+        --keep JSON_VERSION --ARTIFACT \
+        --run "$1" 2>&1
+    }
+    runInNixShell ./.gitlab/before_script/darwin/install_deps.sh 2>&1
+    runInNixShell ./.gitlab/script/ghcup_version.sh 2>&1
+
 .test_ghcup_version:freebsd:
  extends:
    - .test_ghcup_version
@@ -183,7 +215,7 @@ test:linux:bootstrap_script:
  script:
    - ./.gitlab/script/ghcup_bootstrap.sh
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"
  extends:
    - .debian
@@ -195,7 +227,7 @@ test:linux:recommended:
  stage: test
  extends: .test_ghcup_version:linux
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"
  needs: []

@@ -203,7 +235,7 @@ test:linux:latest:
  stage: test
  extends: .test_ghcup_version:linux
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "9.0.1"
    CABAL_VERSION: "3.4.0.0"
  needs: []

@@ -213,7 +245,7 @@ test:linux:recommended:32bit:
  stage: test
  extends: .test_ghcup_version:linux32
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.2.0.0"
  needs: []

@@ -251,10 +283,19 @@ test:mac:latest:
  stage: test
  extends: .test_ghcup_version:darwin
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "9.0.1"
    CABAL_VERSION: "3.4.0.0"
  needs: []

+test:mac:recommended:aarch64:
+  stage: test
+  extends: .test_ghcup_version:darwin:aarch64
+  variables:
+    GHC_VERSION: "8.10.5"
+    CABAL_VERSION: "3.4.0.0"
+  needs: []
+  allow_failure: true
+

 ######## freebsd test ########

@@ -268,23 +309,13 @@ test:freebsd:recommended:
  when: manual
  needs: []

-test:freebsd:latest:
-  stage: test
-  extends: .test_ghcup_version:freebsd
-  variables:
-    GHC_VERSION: "8.10.4"
-    CABAL_VERSION: "3.4.0.0"
-  allow_failure: true # freebsd runners are unreliable
-  when: manual
-  needs: []
-
 ######## windows test ########

 test:windows:recommended:
  stage: test
  extends: .test_ghcup_version:windows
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"
  needs: []

@@ -300,7 +331,7 @@ release:linux:64bit:
    - ./.gitlab/before_script/linux/alpine/install_deps.sh
  variables:
    ARTIFACT: "x86_64-linux-ghcup"
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"


@@ -314,7 +345,7 @@ release:linux:32bit:
    - ./.gitlab/before_script/linux/alpine/install_deps.sh
  variables:
    ARTIFACT: "i386-linux-ghcup"
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.2.0.0"

 release:linux:armv7:
@@ -356,26 +387,59 @@ release:darwin:
    - ./.gitlab/before_script/darwin/install_deps.sh
  variables:
    ARTIFACT: "x86_64-apple-darwin-ghcup"
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"
    MACOSX_DEPLOYMENT_TARGET: "10.7"

+release:darwin:aarch64:
+  stage: release
+  needs: ["test:mac:recommended:aarch64"]
+  extends:
+    - .darwin:aarch64
+    - .release_ghcup
+    - .root_cleanup
+  before_script:
+    - ./.gitlab/before_script/darwin/install_deps.sh
+  variables:
+    ARTIFACT: "aarch64-apple-darwin-ghcup"
+    GHC_VERSION: "8.10.5"
+    CABAL_VERSION: "3.4.0.0"
+    MACOSX_DEPLOYMENT_TARGET: "10.7"
+  allow_failure: true
+

 ######## freebsd release ########

 release:freebsd:
  stage: release
-  needs: ["test:freebsd:recommended", "test:freebsd:latest"]
+  needs: ["test:freebsd:recommended"]
  extends:
    - .freebsd
    - .release_ghcup
    - .root_cleanup
-  before_script:
-    - ./.gitlab/before_script/freebsd/install_deps.sh
+  script: |
+    set -Eeuo pipefail
+    function runInNixShell() {
+      time nix-shell .gitlab/shell.nix \
+        -I nixpkgs=https://github.com/angerman/nixpkgs/archive/75f7281738b.tar.gz \
+        --argstr system "x86_64-darwin" \
+        --pure \
+        --keep GHC_VERSION --keep CABAL_INSTALL_VERSION --keep BUILD_FLAVOUR \
+        --keep BIN_DIST_PREP_TAR_COMP --keep CPUS --keep PROJECT_DIR \
+        --keep CI_PROJECT_DIR --keep MAKE_ARGS --keep HADRIAN_ARGS --keep CABAL_CACHE \
+        --keep LANG --keep CONFIGURE_ARGS --keep TEST_ENV --keep BIN_DIST_NAME \
+        --keep MACOSX_DEPLOYMENT_TARGET --keep ac_cv_func_clock_gettime --keep HACKAGE_INDEX_STATE \
+        --keep CABAL_DIR --keep ARCH --keep OS --keep CABAL_VERSION --keep GHC_VERSION \ 
+        --keep JSON_VERSION --ARTIFACT \
+        --run "$1" 2>&1
+    }
+    runInNixShell ./.gitlab/before_script/freebsd/install_deps.sh 2>&1
+    runInNixShell ./.gitlab/script/ghcup_release.sh 2>&1
  variables:
    ARTIFACT: "x86_64-portbld-freebsd-ghcup"
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"
+  allow_failure: true

 ######## windows release ########

@@ -390,7 +454,7 @@ release:windows:
    - bash ./.gitlab/before_script/windows/install_deps.sh
  variables:
    ARTIFACT: "x86_64-mingw64-ghcup"
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"

 ######## hlint ########
@@ -404,7 +468,7 @@ hlint:
  script:
    - ./.gitlab/script/hlint.sh
  variables:
-    GHC_VERSION: "8.10.4"
+    GHC_VERSION: "8.10.5"
    CABAL_VERSION: "3.4.0.0"
    JSON_VERSION: "0.0.4"
  allow_failure: true
--- a/.gitlab/before_script/darwin/install_deps.sh
+++ b/.gitlab/before_script/darwin/install_deps.sh
@@ -6,10 +6,15 @@ set -eux

 mkdir -p "${TMPDIR}"

-curl -sSfL https://downloads.haskell.org/~ghcup/x86_64-apple-darwin-ghcup > ./ghcup-bin
-chmod +x ghcup-bin
+if [ $ARCH = 'ARM64' ] ; then
+	curl -sSfL https://downloads.haskell.org/~ghcup/0.1.15.1/aarch64-apple-darwin-ghcup-0.1.15.1 > ./ghcup-bin
+	chmod +x ghcup-bin
+else
+	curl -sSfL https://downloads.haskell.org/~ghcup/x86_64-apple-darwin-ghcup > ./ghcup-bin
+	chmod +x ghcup-bin
+	./ghcup-bin upgrade -i -f
+fi

-./ghcup-bin upgrade -i -f
 ./ghcup-bin install ${GHC_VERSION}
 ./ghcup-bin set ${GHC_VERSION}
 ./ghcup-bin install-cabal ${CABAL_VERSION}
--- a/.gitlab/before_script/windows/install_deps.sh
+++ b/.gitlab/before_script/windows/install_deps.sh
@@ -6,11 +6,10 @@ set -eux

 mkdir -p "${TMPDIR}" "${CABAL_DIR}"

-rm -rf /c/ghcup
-mkdir -p /c/ghcup
+mkdir -p "$GHCUP_INSTALL_BASE_PREFIX/ghcup/bin"

 CI_PROJECT_DIR=$(pwd)
-curl -o ghcup.exe https://downloads.haskell.org/~ghcup/tmp/x86_64-mingw64-ghcup-5.exe
+curl -o ghcup.exe https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-mingw64-ghcup-0.1.15.1.exe
 chmod +x ghcup.exe

 ./ghcup.exe install ${GHC_VERSION}
--- a/.gitlab/ghcup_env
+++ b/.gitlab/ghcup_env
@@ -1,6 +1,6 @@
 if [ "${OS}" = "WINDOWS" ] ; then
 	export GHCUP_INSTALL_BASE_PREFIX="$CI_PROJECT_DIR"
-	export PATH="/c/ghcup/bin:$CI_PROJECT_DIR/.local/bin:$PATH"
+	export PATH="$GHCUP_INSTALL_BASE_PREFIX/ghcup/bin:$CI_PROJECT_DIR/.local/bin:$PATH"
 	export TMPDIR="$CI_PROJECT_DIR/tmp"
 else
 	export GHCUP_INSTALL_BASE_PREFIX="$CI_PROJECT_DIR"
--- a/.gitlab/script/ghcup_release.sh
+++ b/.gitlab/script/ghcup_release.sh
@@ -29,7 +29,7 @@ if [ "${OS}" = "LINUX" ] ; then
 		ecabal build -w ghc-${GHC_VERSION} -ftui
 	fi
 elif [ "${OS}" = "FREEBSD" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} --ghc-options='-split-sections' --constraint="zlib +bundled-c-zlib" -ftui
+	ecabal build -w ghc-${GHC_VERSION} --ghc-options='-split-sections' --constraint="zlib +bundled-c-zlib" --constraint="zip +disable-zstd" -ftui
 elif [ "${OS}" = "WINDOWS" ] ; then
 	ecabal build -w ghc-${GHC_VERSION} --constraint="zlib +bundled-c-zlib" --constraint="lzma +static"
 else
@@ -37,12 +37,12 @@ else
 fi

 mkdir out
-cp "$(ecabal new-exec -w ghc-${GHC_VERSION} --verbose=0 --offline sh -- -c 'command -v ghcup')" .
-ver=$(./ghcup --numeric-version)
+binary=$(ecabal new-exec -w ghc-${GHC_VERSION} --verbose=0 --offline sh -- -c 'command -v ghcup')
+ver=$("${binary}" --numeric-version)
 if [ "${OS}" = "DARWIN" ] ; then
-	strip ./ghcup
+	strip "${binary}"
 else
-	strip -s ./ghcup
+	strip -s "${binary}"
 fi
-cp ghcup out/${ARTIFACT}-${ver}
+cp "${binary}" out/${ARTIFACT}-${ver}

--- a/.gitlab/script/ghcup_version.sh
+++ b/.gitlab/script/ghcup_version.sh
@@ -34,34 +34,47 @@ ecabal update
 if [ "${OS}" = "DARWIN" ] ; then
 	ecabal build -w ghc-${GHC_VERSION} -ftui
 	ecabal test -w ghc-${GHC_VERSION} -ftui ghcup-test
+	ecabal haddock -w ghc-${GHC_VERSION} -ftui
 elif [ "${OS}" = "LINUX" ] ; then
 	if [ "${ARCH}" = "32" ] ; then
 		ecabal build -w ghc-${GHC_VERSION} -finternal-downloader -ftui -ftar
 		ecabal test -w ghc-${GHC_VERSION} -finternal-downloader -ftui -ftar ghcup-test
+		ecabal haddock -w ghc-${GHC_VERSION} -finternal-downloader -ftui -ftar
 	else
 		ecabal build -w ghc-${GHC_VERSION} -finternal-downloader -ftui
 		ecabal test -w ghc-${GHC_VERSION} -finternal-downloader -ftui ghcup-test
+		ecabal haddock -w ghc-${GHC_VERSION} -finternal-downloader -ftui
 	fi
+elif [ "${OS}" = "FREEBSD" ] ; then
+	ecabal build -w ghc-${GHC_VERSION} -finternal-downloader -ftui --constraint="zip +disable-zstd"
+	ecabal test -w ghc-${GHC_VERSION} -finternal-downloader -ftui --constraint="zip +disable-zstd" ghcup-test
+	ecabal haddock -w ghc-${GHC_VERSION} -finternal-downloader -ftui --constraint="zip +disable-zstd"
 elif [ "${OS}" = "WINDOWS" ] ; then
 	ecabal build -w ghc-${GHC_VERSION}
 	ecabal test -w ghc-${GHC_VERSION} ghcup-test
+	ecabal haddock -w ghc-${GHC_VERSION}
 else
 	ecabal build -w ghc-${GHC_VERSION} -finternal-downloader -ftui
 	ecabal test -w ghc-${GHC_VERSION} -finternal-downloader -ftui ghcup-test
+	ecabal haddock -w ghc-${GHC_VERSION} -finternal-downloader -ftui
 fi

-ecabal haddock -w ghc-${GHC_VERSION} -ftar

-cp "$(ecabal new-exec -w ghc-${GHC_VERSION} --verbose=0 --offline sh -- -c 'command -v ghcup')" .
-cp "$(ecabal new-exec -w ghc-${GHC_VERSION} --verbose=0 --offline sh -- -c 'command -v ghcup-gen')" .
-
-cp ./ghcup "$CI_PROJECT_DIR"/.local/bin/ghcup
-cp ./ghcup-gen "$CI_PROJECT_DIR"/.local/bin/ghcup-gen
+if [ "${OS}" = "WINDOWS" ] ; then
+	ext=".exe"
+else
+	ext=''
+fi
+	cp "$(ecabal new-exec -w ghc-${GHC_VERSION} --verbose=0 --offline sh -- -c 'command -v ghcup')" "$CI_PROJECT_DIR"/.local/bin/ghcup${ext}
+	cp "$(ecabal new-exec -w ghc-${GHC_VERSION} --verbose=0 --offline sh -- -c 'command -v ghcup-gen')" "$CI_PROJECT_DIR"/.local/bin/ghcup-gen${ext}

 ### cleanup

-rm -rf "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup
-
+if [ "${OS}" = "WINDOWS" ] ; then
+	rm -rf "${GHCUP_INSTALL_BASE_PREFIX}"/ghcup
+else
+	rm -rf "${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup
+fi

 ### manual cli based testing

@@ -84,9 +97,11 @@ eghcup list -t cabal

 ghc_ver=$(ghc --numeric-version)
 ghc --version
-ghci --version
-ghc-$(ghc --numeric-version) --version
-ghci-$(ghc --numeric-version) --version
+ghc-${ghc_ver} --version
+if [ "${OS}" != "WINDOWS" ] ; then
+		ghci --version
+		ghci-${ghc_ver} --version
+fi


 # test installing new ghc doesn't mess with currently set GHC
--- a/.gitlab/shell.nix
+++ b/.gitlab/shell.nix
@@ -0,0 +1,91 @@
+{ system ? "aarch64-darwin"
+#, nixpkgs ? fetchTarball https://github.com/angerman/nixpkgs/archive/257cb120334.tar.gz #apple-silicon.tar.gz
+, pkgs ? import <nixpkgs> { inherit system; }
+, compiler ? if system == "aarch64-darwin" then "ghc8103Binary" else "ghc8103"
+}: pkgs.mkShell {
+  # this prevents nix from trying to write the env-vars file.
+  # we can't really, as NIX_BUILD_TOP/env-vars is not set.
+  noDumpEnvVars=1;
+
+  # stop polluting LDFLAGS with -liconv
+  dontAddExtraLibs = true;
+
+  # we need to inject ncurses into --with-curses-libraries.
+  # the real fix is to teach terminfo to use libcurses on macOS.
+  # CONFIGURE_ARGS = "--with-intree-gmp --with-curses-libraries=${pkgs.ncurses.out}/lib";
+  CONFIGURE_ARGS = "--with-intree-gmp --with-curses-libraries=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib --with-iconv-includes=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include --with-iconv-libraries=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib SH=/bin/bash";
+
+  # magic speedup pony :facepalm:
+  #
+  # nix has the ugly habbit of duplicating ld flags more than necessary.  This
+  # somewhat consolidates this.
+  shellHook = ''
+  export NIX_LDFLAGS=$(for a in $NIX_LDFLAGS; do echo $a; done |sort|uniq|xargs)
+  export NIX_LDFLAGS_FOR_TARGET=$(for a in $NIX_LDFLAGS_FOR_TARGET; do echo $a; done |sort|uniq|xargs)
+  export NIX_LDFLAGS_FOR_TARGET=$(comm -3 <(for l in $NIX_LDFLAGS_FOR_TARGET; do echo $l; done) <(for l in $NIX_LDFLAGS; do echo $l; done))
+
+
+  # Impurity hack for GHC releases.
+  #################################
+  # We don't want binary releases to depend on nix, thus we'll need to make sure we don't leak in references.
+  # GHC externally depends only on iconv and curses.  However we can't force a specific curses library for
+  # the terminfo package, as such we'll need to make sure we only look in the system path for the curses library
+  # and not pick up the tinfo from the nix provided ncurses package.
+  #
+  # We also need to force us to use the systems COREFOUNDATION, not the one that nix builds. Again this is impure,
+  # but it will allow us to have proper binary distributions.
+  #
+  # do not use nixpkgs provided core foundation
+  export NIX_COREFOUNDATION_RPATH=/System/Library/Frameworks
+  # drop curses from the LDFLAGS, we really want the system ones, not the nix ones.
+  export NIX_LDFLAGS=$(for lib in $NIX_LDFLAGS; do case "$lib" in *curses*);; *) echo -n "$lib ";; esac; done;)
+  export NIX_CFLAGS_COMPILE+=" -Wno-nullability-completeness -Wno-availability -Wno-expansion-to-defined -Wno-builtin-requires-header -Wno-unused-command-line-argument"
+
+  # unconditionally add the MacOSX.sdk and TargetConditional.h
+  export NIX_CFLAGS_COMPILE+=" -isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include"
+
+  # Use an architecture specific home, so cabal for different architectures don't confuse each other.
+  export HOME="$HOME/$(uname -m)-home"
+  mkdir -p $HOME
+  '';
+
+  nativeBuildInputs = (with pkgs; [
+    # This needs to come *before* ghc,
+    # otherwise we migth end up with the clang from
+    # the bootstrap GHC in PATH with higher priority.
+    clang_11
+    llvm_11
+
+    haskell.compiler.${compiler}
+    haskell.packages.${compiler}.cabal-install
+    haskell.packages.${compiler}.alex
+    haskell.packages.${compiler}.happy # _1_19_12 is needed for older GHCs.
+
+    automake
+    autoconf
+    m4
+
+    gmp
+    zlib.out
+    zlib.dev
+    glibcLocales
+    # locale doesn't build yet :-/
+    # locale
+
+    git
+
+    python3
+    # python3Full
+    # python3Packages.sphinx
+    perl
+
+    which
+    wget
+    file
+
+    xz
+    xlibs.lndir
+
+    cacert ])
+  ++ (with pkgs.darwin.apple_sdk.frameworks; [ Foundation Security ]);
+}
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,12 +1,14 @@
 # Revision history for ghcup

-## 0.1.15 -- ????-??-??
+## 0.1.15.1 -- 2021-06-11

+* Add Apple Silicon support
 * Add windows support wrt [#130](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/130)
-* Add date to GHC bindist names created by ghcup
+* Add stack support
 * Warn when /tmp doesn't have 5GB or more of disk space
 * Allow to compile GHC from git repo wrt [#126](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/126)
-* Add stack support
+* Allow to set custom ghc version when running 'ghcup compile ghc' wrt [#136](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/136)
+* Add date to GHC bindist names created by ghcup

 ## 0.1.14.2 -- 2021-05-12

--- a/README.md
+++ b/README.md
@@ -123,6 +123,9 @@ Then you can control the locations via XDG environment variables as such:
 * `XDG_BIN_HOME`: binaries end up here (default: `~/.local/bin`)
 * `XDG_CONFIG_HOME`: the config file is stored in `ghcup` subdir as `config.yaml` (default: `~/.config`)

+**Note that `ghcup` makes some assumptions about structure of files in `XDG_BIN_HOME`. So if you have other tools
+installing e.g. stack/cabal/ghc into it, this will likely clash. In that case consider disabling XDG support.**
+
 ### Env variables

 This is the complete list of env variables that change GHCup behavior:
@@ -132,6 +135,7 @@ This is the complete list of env variables that change GHCup behavior:
 * `GHCUP_INSTALL_BASE_PREFIX`: the base of ghcup (default: `$HOME`)
 * `GHCUP_CURL_OPTS`: additional options that can be passed to curl
 * `GHCUP_WGET_OPTS`: additional options that can be passed to wget
+* `GHCUP_SKIP_UPDATE_CHECK`: Skip the (possibly annoying) update check when you run a command
 * `CC`/`LD` etc.: full environment is passed to the build system when compiling GHC via GHCup

 ### Installing custom bindists
--- a/app/ghcup-gen/Main.hs
+++ b/app/ghcup-gen/Main.hs
@@ -69,13 +69,15 @@ tarballFilterP = option readm $
  long "tarball-filter" <> short 'u' <> metavar "<tool>-<version>" <> value def
    <> help "Only check certain tarballs (format: <tool>-<version>)"
  where
-    def = TarballFilter Nothing (makeRegex ("" :: String))
+    def = TarballFilter (Right Nothing) (makeRegex ("" :: String))
    readm = do
      s <- str
      case span (/= '-') s of
        (_, []) -> fail "invalid format, missing '-' after the tool name"
        (t, v) | [tool] <- [ tool | tool <- [minBound..maxBound], low (show tool) == low t ] ->
-          pure (TarballFilter $ Just tool) <*> makeRegexOptsM compIgnoreCase execBlank (drop 1 v)
+          pure (TarballFilter $ Right $ Just tool) <*> makeRegexOptsM compIgnoreCase execBlank (drop 1 v)
+        (t, v) | [tool] <- [ tool | tool <- [minBound..maxBound], low (show tool) == low t ] ->
+          pure (TarballFilter $ Left tool) <*> makeRegexOptsM compIgnoreCase execBlank (drop 1 v)
        _ -> fail "invalid tool"
    low = fmap toLower

@@ -105,23 +107,18 @@ main :: IO ()
 main = do
  _ <- customExecParser (prefs showHelpOnError) (info (opts <**> helper) idm)
    >>= \Options {..} -> case optCommand of
-          ValidateYAML vopts -> case vopts of
-            ValidateYAMLOpts { vInput = Nothing } ->
-              B.getContents >>= valAndExit validate
-            ValidateYAMLOpts { vInput = Just StdInput } ->
-              B.getContents >>= valAndExit validate
-            ValidateYAMLOpts { vInput = Just (FileInput file) } ->
-              B.readFile file >>= valAndExit validate
-          ValidateTarballs vopts tarballFilter -> case vopts of
-            ValidateYAMLOpts { vInput = Nothing } ->
-              B.getContents >>= valAndExit (validateTarballs tarballFilter)
-            ValidateYAMLOpts { vInput = Just StdInput } ->
-              B.getContents >>= valAndExit (validateTarballs tarballFilter)
-            ValidateYAMLOpts { vInput = Just (FileInput file) } ->
-              B.readFile file >>= valAndExit (validateTarballs tarballFilter)
+          ValidateYAML vopts -> withValidateYamlOpts vopts validate
+          ValidateTarballs vopts tarballFilter -> withValidateYamlOpts vopts (validateTarballs tarballFilter)
  pure ()

 where
+  withValidateYamlOpts vopts f = case vopts of
+    ValidateYAMLOpts { vInput = Nothing } ->
+      B.getContents >>= valAndExit f
+    ValidateYAMLOpts { vInput = Just StdInput } ->
+      B.getContents >>= valAndExit f
+    ValidateYAMLOpts { vInput = Just (FileInput file) } ->
+      B.readFile file >>= valAndExit f
  valAndExit f contents = do
    (GHCupInfo _ av gt) <- case Y.decodeEither' contents of
      Right r -> pure r
--- a/app/ghcup-gen/Validate.hs
+++ b/app/ghcup-gen/Validate.hs
@@ -184,7 +184,7 @@ validate dls _ = do
  isBase _        = False

 data TarballFilter = TarballFilter
-  { tfTool    :: Maybe Tool
+  { tfTool    :: Either GlobalTool (Maybe Tool)
  , tfVersion :: Regex
  }

@@ -201,17 +201,16 @@ validateTarballs :: ( Monad m
                 -> GHCupDownloads
                 -> M.Map GlobalTool DownloadInfo
                 -> m ExitCode
-validateTarballs (TarballFilter tool versionRegex) dls gt = do
+validateTarballs (TarballFilter etool versionRegex) dls gt = do
  ref <- liftIO $ newIORef 0

  flip runReaderT ref $ do
     -- download/verify all tarballs
-    let dlis = nubOrd $ dls ^.. each %& indices (maybe (const True) (==) tool) %> each %& indices (matchTest versionRegex . T.unpack . prettyVer) % (viSourceDL % _Just `summing` viArch % each % each % each)
-    when (null dlis) $ $(logError) [i|no tarballs selected by filter|] *> addError
-
+    let dlis = either (const []) (\tool -> nubOrd $ dls ^.. each %& indices (maybe (const True) (==) tool) %> each %& indices (matchTest versionRegex . T.unpack . prettyVer) % (viSourceDL % _Just `summing` viArch % each % each % each)) etool
    let gdlis = nubOrd $ gt ^.. each
-
-    forM_ (dlis ++ gdlis) downloadAll
+    let allDls = either (const gdlis) (const dlis) etool
+    when (null allDls) $ $(logError) [i|no tarballs selected by filter|] *> addError
+    forM_ allDls downloadAll

    -- exit
    e <- liftIO $ readIORef ref
@@ -254,18 +253,21 @@ validateTarballs (TarballFilter tool versionRegex) dls gt = do
 #endif
               ]
      $ do
-        case tool of
-          Just GHCup -> do
-            let fn = "ghcup"
-            p <- liftE $ download (settings appstate) dli (cacheDir dirs) (Just fn)
-            liftE $ checkDigest (settings appstate) dli p
+        case etool of
+          Right (Just GHCup) -> do
+            tmpUnpack <- lift mkGhcupTmpDir
+            _ <- liftE $ download (settings appstate) dli tmpUnpack Nothing
            pure Nothing
-          _ -> do
+          Right _ -> do
            p <- liftE $ downloadCached (settings appstate) dirs dli Nothing
            fmap (Just . head . splitDirectories . head)
              . liftE
              . getArchiveFiles
              $ p
+          Left ShimGen -> do
+            tmpUnpack <- lift mkGhcupTmpDir
+            _ <- liftE $ download (settings appstate) dli tmpUnpack Nothing
+            pure Nothing
    case r of
      VRight (Just basePath) -> do
        case _dlSubdir dli of
--- a/app/ghcup/Main.hs
+++ b/app/ghcup/Main.hs
@@ -174,6 +174,7 @@ data GHCCompileOptions = GHCCompileOptions
  , crossTarget  :: Maybe Text
  , addConfArgs  :: [Text]
  , setCompile   :: Bool
+  , ovewrwiteVer :: Maybe Version
  }

 data UpgradeOpts = UpgradeInplace
@@ -291,7 +292,7 @@ com =
          (   Install
          <$> info
                (installParser <**> helper)
-                (  progDesc "Install or update GHC/cabal"
+                (  progDesc "Install or update GHC/cabal/HLS"
                <> footerDoc (Just $ text installToolFooter)
                )
          )
@@ -307,7 +308,7 @@ com =
           "rm"
           (info
             (Rm <$> rmParser <**> helper)
-             (  progDesc "Remove a GHC/cabal version"
+             (  progDesc "Remove a GHC/cabal/HLS version"
             <> footerDoc (Just $ text rmFooter)
             )
           )
@@ -762,6 +763,15 @@ ghcCompileOpts =
          (long "set" <> help
            "Set as active version after install"
          )
+    <*> optional
+          (option
+            (eitherReader
+              (first (const "Not a valid version") . version . T.pack)
+            )
+            (short 'o' <> long "overwrite-version" <> metavar "OVERWRITE_VERSION" <> help
+              "Allows to overwrite the finally installed VERSION with a different one, e.g. when you build 8.10.4 with your own patches, you might want to set this to '8.10.4-p1'"
+            )
+          )


 toolVersionParser :: Parser ToolVersion
@@ -1085,10 +1095,10 @@ Report bugs at <https://gitlab.haskell.org/haskell/ghcup-hs/issues>|]
    >>= \opt@Options {..} -> do
          dirs <- getDirs

-          (settings, keybindings) <- toSettings opt
-
          -- create ~/.ghcup dir
-          createDirRecursive' (baseDir dirs)
+          ensureDirectories dirs
+
+          (settings, keybindings) <- toSettings opt

          -- logger interpreter
          logfile <- initGHCupFileLogging (logsDir dirs)
@@ -1114,7 +1124,7 @@ Report bugs at <https://gitlab.haskell.org/haskell/ghcup-hs/issues>|]
          ----------------------------------------
          -- Getting download and platform info --
          ----------------------------------------
-          
+
          ghcupInfo <-
            ( runLogger
              . runE @'[JSONError , DownloadFailed, FileDoesNotExistError]
@@ -1134,7 +1144,10 @@ Report bugs at <https://gitlab.haskell.org/haskell/ghcup-hs/issues>|]

          case optCommand of
            Upgrade _ _ -> pure ()
-            _ -> runLogger $ flip runReaderT appstate $ checkForUpdates
+            _ -> do
+              lookupEnv "GHCUP_SKIP_UPDATE_CHECK" >>= \case
+                Nothing -> runLogger $ flip runReaderT appstate $ checkForUpdates
+                Just _ -> pure ()


          -- ensure global tools
@@ -1571,6 +1584,7 @@ Report bugs at <https://gitlab.haskell.org/haskell/ghcup-hs/issues>|]
                  Right _ -> pure ()
                targetVer <- liftE $ compileGHC
                            (first (GHCTargetVersion crossTarget) targetGhc)
+                            ovewrwiteVer
                            bootstrapGhc
                            jobs
                            buildConfig
@@ -1607,7 +1621,7 @@ Make sure to clean up #{tmpdir} afterwards.|])
              target <- case uOpts of
                UpgradeInplace  -> Just <$> liftIO getExecutablePath
                (UpgradeAt p)   -> pure $ Just p
-                UpgradeGHCupDir -> pure (Just (binDir </> "ghcup"))
+                UpgradeGHCupDir -> pure (Just (binDir </> "ghcup" <> exeExt))

              runUpgrade (liftE $ upgradeGHCup target force) >>= \case
                VRight v' -> do
--- a/43
+++ b/43
@@ -16,14 +16,15 @@

 plat="$(uname -s)"
 arch=$(uname -m)
-ghver="0.1.14.1"
+ghver="0.1.15.1"
 base_url="https://downloads.haskell.org/~ghcup"

 case "${plat}" in
        MSYS*|MINGW*)
 			: "${GHCUP_INSTALL_BASE_PREFIX:=/c}"
-			GHCUP_DIR=${GHCUP_INSTALL_BASE_PREFIX}/ghcup
-			GHCUP_BIN=${GHCUP_INSTALL_BASE_PREFIX}/ghcup/bin
+			GHCUP_DIR=$(cygpath -u "${GHCUP_INSTALL_BASE_PREFIX}/ghcup")
+			GHCUP_BIN=$(cygpath -u "${GHCUP_INSTALL_BASE_PREFIX}/ghcup/bin")
+			: "${GHCUP_MSYS2:=${GHCUP_DIR}/msys64}"
 			;;
 		*)
 			: "${GHCUP_INSTALL_BASE_PREFIX:=$HOME}"
@@ -72,9 +73,9 @@ _eghcup() {
 		args="-s ${BOOTSTRAP_HASKELL_YAML}"
 	fi 
    if [ -z "${BOOTSTRAP_HASKELL_VERBOSE}" ] ; then
-        ghcup ${args} "$@"
+        "${GHCUP_BIN}/ghcup" ${args} "$@"
    else
-        ghcup ${args} --verbose "$@"
+        "${GHCUP_BIN}/ghcup" ${args} --verbose "$@"
    fi
 }

@@ -165,6 +166,10 @@ download_ghcup() {
        "Darwin"|"darwin")
 			case "${arch}" in
 				x86_64|amd64)
+					_url=${base_url}/${ghver}/x86_64-apple-darwin-ghcup-${ghver}
+					;;
+				aarch64|arm64|armv8l)
+					_url=${base_url}/${ghver}/aarch64-apple-darwin-ghcup-${ghver}
 					;;
 				i*86)
 					die "i386 currently not supported!"
@@ -172,11 +177,11 @@ download_ghcup() {
 				*) die "Unknown architecture: ${arch}"
 					;;
 			esac
-			_url=${base_url}/${ghver}/x86_64-apple-darwin-ghcup-${ghver} ;;
+			;;
        MSYS*|MINGW*)
 			case "${arch}" in
 				x86_64|amd64)
-					_url=https://downloads.haskell.org/~ghcup/tmp/x86_64-mingw64-ghcup-7.exe
+					_url=${base_url}/${ghver}/x86_64-mingw64-ghcup-${ghver}.exe
 					;;
 				*) die "Unknown architecture: ${arch}"
 					;;
@@ -272,7 +277,7 @@ eghcup set ghc "${BOOTSTRAP_HASKELL_GHC_VERSION}"
 eghcup --cache install cabal "${BOOTSTRAP_HASKELL_CABAL_VERSION}"

 adjust_cabal_config() {
-	edo cabal user-config -a "extra-prog-path: $(cygpath -w $GHCUP_BIN), $(cygpath -w "$HOME"/AppData/Roaming/cabal/bin), $(cygpath -w "$GHCUP_DIR"/msys64/usr/bin), $(cygpath -w "$GHCUP_DIR"/msys64/mingw64/bin)" -a "extra-include-dirs: $(cygpath -w "$GHCUP_DIR"/msys64/mingw64/include)" -a "extra-lib-dirs: $(cygpath -w "$GHCUP_DIR"/msys64/mingw64/lib)" -f init
+	edo cabal user-config -a "extra-prog-path: $(cygpath -w "$GHCUP_BIN"), $(cygpath -w "$HOME"/AppData/Roaming/cabal/bin), $(cygpath -w "$GHCUP_MSYS2"/usr/bin), $(cygpath -w "$GHCUP_MSYS2"/mingw64/bin)" -a "extra-include-dirs: $(cygpath -w "$GHCUP_MSYS2"/mingw64/include)" -a "extra-lib-dirs: $(cygpath -w "$GHCUP_MSYS2"/mingw64/lib)" -f init
 }

 case "${plat}" in
@@ -290,6 +295,7 @@ case "${plat}" in
 							break ;;
 						[Nn]*)
 							echo "Make sure that your global cabal.config references the correct mingw64 paths (extra-prog-path, extra-include-dirs and extra-lib-dirs)."
+							echo "And set the environment variable GHCUP_MSYS2 to the root path of your msys2 installation."
 							sleep 5
 							break ;;
 						*)
@@ -325,7 +331,7 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then

 		case $hls_answer in
 			[Yy]*)
-				eghcup --cache install hls
+				eghcup --cache install hls || warn "HLS installation failed, continuing anyway"
 				break ;;
 			[Nn]* | "")
 				break ;;
@@ -352,7 +358,7 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then

 		case $stack_answer in
 			[Yy]*)
-				eghcup --cache install stack
+				eghcup --cache install stack || warn "Stack installation failed, continuing anyway"
 				break ;;
 			[Nn]* | "")
 				break ;;
@@ -413,17 +419,13 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 				case $MY_SHELL in
 					"") break ;;
 					fish)
-						if ! grep -q "ghcup-env" "${GHCUP_PROFILE_FILE}" ; then
 							mkdir -p "${GHCUP_PROFILE_FILE%/*}"
-							echo "# ghcup-env" >> "${GHCUP_PROFILE_FILE}"
-							echo "set -q GHCUP_INSTALL_BASE_PREFIX[1]; or set GHCUP_INSTALL_BASE_PREFIX \$HOME" >> "${GHCUP_PROFILE_FILE}"
-							echo "test -f $GHCUP_DIR/env ; and set -gx PATH \$HOME/.cabal/bin $GHCUP_BIN \$PATH" >> "${GHCUP_PROFILE_FILE}"
-						fi
+							sed -i -e '/# ghcup-env$/ s/^#*/#/' "${GHCUP_PROFILE_FILE}"
+							echo "set -q GHCUP_INSTALL_BASE_PREFIX[1]; or set GHCUP_INSTALL_BASE_PREFIX \$HOME ; test -f $GHCUP_DIR/env ; and set -gx PATH \$HOME/.cabal/bin $GHCUP_BIN \$PATH # ghcup-env" >> "${GHCUP_PROFILE_FILE}"
 						break ;;
 					bash)
-						if ! grep -q "ghcup-env" "${GHCUP_PROFILE_FILE}" ; then
-							echo "[ -f \"${GHCUP_DIR}/env\" ] && source \"${GHCUP_DIR}/env\" # ghcup-env" >> "${GHCUP_PROFILE_FILE}"
-						fi
+						sed -i -e '/# ghcup-env$/ s/^#*/#/' "${GHCUP_PROFILE_FILE}"
+						echo "[ -f \"${GHCUP_DIR}/env\" ] && source \"${GHCUP_DIR}/env\" # ghcup-env" >> "${GHCUP_PROFILE_FILE}"
 						case "${plat}" in
 							"Darwin"|"darwin")
 								if ! grep -q "ghcup-env" "${HOME}/.bash_profile" ; then
@@ -434,9 +436,8 @@ if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 						break ;;

 					zsh)
-						if ! grep -q "ghcup-env" "${GHCUP_PROFILE_FILE}" ; then
-							echo "[ -f \"${GHCUP_DIR}/env\" ] && source \"${GHCUP_DIR}/env\" # ghcup-env" >> "${GHCUP_PROFILE_FILE}"
-						fi
+						sed -i -e '/# ghcup-env$/ s/^#*/#/' "${GHCUP_PROFILE_FILE}"
+						echo "[ -f \"${GHCUP_DIR}/env\" ] && source \"${GHCUP_DIR}/env\" # ghcup-env" >> "${GHCUP_PROFILE_FILE}"
 						break ;;
 				esac
                warn "OK! ${GHCUP_PROFILE_FILE} has been modified. Restart your terminal for the changes to take effect,"
--- a/bootstrap-haskell.ps1
+++ b/bootstrap-haskell.ps1
@@ -1,6 +1,35 @@
+<#
+    .SYNOPSIS
+    Script to bootstrap a Haskell environment
+
+    .DESCRIPTION
+    This is the windows GHCup installer, installing:
+
+    * ghcup - The Haskell toolchain installer"
+    * ghc   - The Glasgow Haskell Compiler"
+    * msys2 - Unix-style toolchain needed for dependencies and tools
+    * cabal - The Cabal build tool for managing Haskell software"
+    * stack - (optional) A cross-platform program for developing Haskell projects"
+    * hls   - (optional) A language server for developers to integrate with their editor/IDE"
+#>
+param (
+    # Run a non-interactive installation
+    [switch]$Silent,
+    # Specify the install root (default: 'C:\')
+    [string]$InstallDir,
+    # Instead of installing a new MSys2, use an existing installation
+    [string]$ExistingMsys2Dir,
+    # Specify the cabal root directory (default: '$InstallDir\cabal')
+    [string]$CabalDir,
+    # Perform a quick installation, omitting some expensive operations (you may have to install dependencies yourself later)
+    [bool]$Quick,
+    # Overwrite (or rather backup) a previous install
+    [bool]$Overwrite
+)
+
 function Print-Msg {
-  param ( [Parameter(Mandatory=$true, HelpMessage='String to output')][string]$msg )
-  Write-Host ('{0}' -f $msg) -ForegroundColor Green
+  param ( [Parameter(Mandatory=$true, HelpMessage='String to output')][string]$msg, [string]$color = "Green" )
+  Write-Host ('{0}' -f $msg) -ForegroundColor $color
 }

 function Create-Shortcut {
@@ -15,51 +44,48 @@ function Create-Shortcut {
 }

 function Add-EnvPath {
-    param(
-        [Parameter(Mandatory=$true,HelpMessage='The Pathe to add to Users environment')]
-        [string] $Path,
+  param(
+      [Parameter(Mandatory=$true,HelpMessage='The Path to add to Users environment')]
+      [string] $Path,

-        [ValidateSet('Machine', 'User', 'Session')]
-        [string] $Container = 'Session'
-    )
+      [ValidateSet('Machine', 'User', 'Session')]
+      [string] $Container = 'Session'
+  )

-    function Where-Something
-    {
-      param
-      (
-        [Parameter(Mandatory=$true, ValueFromPipeline=$true, HelpMessage='Data to filter')]
-        $InputObject
-      )
-      process
-      {
-        if ($InputObject)
-        {
-          $InputObject
-        }
+  if ($Container -eq 'Session') {
+      $envPaths = [Collections.Generic.List[String]]($env:Path -split ([IO.Path]::PathSeparator))
+      if ($envPaths -notcontains $Path) {
+          $envPaths.Add($Path)
+          $env:PATH = $envPaths -join ([IO.Path]::PathSeparator)
+      }
+  }
+  else {
+      [Microsoft.Win32.RegistryHive]$hive, $keyPath = switch ($Container) {
+          'Machine' { 'LocalMachine', 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment' }
+          'User' { 'CurrentUser', 'Environment' }
      }
-    }

-  if ($Container -ne 'Session') {
-        $containerMapping = @{
-            Machine = [EnvironmentVariableTarget]::Machine
-            User = [EnvironmentVariableTarget]::User
-        }
-        $containerType = $containerMapping[$Container]
+      $hiveKey = $envKey = $null
+      try {
+          $hiveKey = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey($hive, '')
+          $envKey = $hiveKey.OpenSubKey($keyPath, $true)
+          $rawPath = $envKey.GetValue('PATH', '', 'DoNotExpandEnvironmentNames')

-        $persistedPaths = [Environment]::GetEnvironmentVariable('Path', $containerType) -split ';'
-        if ($persistedPaths -notcontains $Path) {
-            $persistedPaths = $persistedPaths + $Path | Where-Something
-            [Environment]::SetEnvironmentVariable('Path', $persistedPaths -join ';', $containerType)
-        }
-    }
-
-    $envPaths = $env:Path -split ';'
-    if ($envPaths -notcontains $Path) {
-        $envPaths = $envPaths + $Path | Where-Something
-        $env:Path = $envPaths -join ';'
-    }
+          $envPaths = [Collections.Generic.List[String]]($rawPath -split ([IO.Path]::PathSeparator))
+          if ($envPaths -notcontains $Path) {
+              $envPaths.Add($Path)
+              $envKey.SetValue('PATH', ($envPaths -join ([IO.Path]::PathSeparator)), 'ExpandString')
+          }
+      }
+      finally {
+          if ($envKey) { $envKey.Close() }
+          if ($hiveKey) { $hiveKey.Close() }
+      }
+  }
 }

+
+
 filter Get-FileSize {
 	'{0:N2} {1}' -f $(
 	if ($_ -lt 1kb) { $_, 'Bytes' }
@@ -91,18 +117,102 @@ function Get-FileWCSynchronous{
    Get-Item -Path $destination | Unblock-File
 }

+function Test-AbsolutePath {
+  Param (
+      [Parameter(Mandatory=$True)]
+      [ValidateScript({[System.IO.Path]::IsPathRooted($_)})]
+      [String]$Path
+  )
+}
+
+function Exec
+{
+    [CmdletBinding()]
+    param(
+        [Parameter(Position = 0, Mandatory = 1)][string]$cmd,
+        [Parameter()][string]$errorMessage,
+        [parameter(ValueFromRemainingArguments = $true)]
+        [string[]]$Passthrough
+    )
+    & $cmd @Passthrough
+    if ($lastexitcode -ne 0) {
+        if (!($errorMessage)) {
+          throw ('Exec: Error executing command {0} with arguments ''{1}''' -f $cmd, "$Passthrough")
+        } else {
+          throw ('Exec: ' + $errorMessage)
+        }
+    }
+}
+
 $ErrorActionPreference = 'Stop'

-$GhcupDir = "$env:HOMEDRIVE\ghcup"
+$GhcupBasePrefixEnv = [System.Environment]::GetEnvironmentVariable('GHCUP_INSTALL_BASE_PREFIX', 'user')
+
+if ($GhcupBasePrefixEnv) {
+  $defaultGhcupBasePrefix = $GhcupBasePrefixEnv
+} else {
+  $defaultGhcupBasePrefix = 'C:\'
+}
+
+if ($Silent -and !($InstallDir)) {
+  $GhcupBasePrefix = $defaultGhcupBasePrefix
+} elseif ($InstallDir) {
+  if (!(Test-Path -LiteralPath ('{0}' -f $InstallDir) -IsValid)) {
+    Print-Msg -color Red -msg "Not a valid directory!"
+    Exit 1
+  } elseif (!(Split-Path -IsAbsolute -Path "$InstallDir")) {
+    Print-Msg -color Red -msg "Non-absolute Path specified!"
+    Exit 1
+  } else {
+    $GhcupBasePrefix = $InstallDir
+  }
+} else {
+  while ($true) {
+    Print-Msg -color Magenta -msg ('Where to install to (this should be a short Path, preferably a Drive like ''C:\''){1}Press enter to accept the default [{0}]:' -f $defaultGhcupBasePrefix, "`n")
+    $basePrefixPrompt = Read-Host
+    $GhcupBasePrefix = ($defaultGhcupBasePrefix,$basePrefixPrompt)[[bool]$basePrefixPrompt]
+    if (!($GhcupBasePrefix.EndsWith('\'))) {
+      $GhcupBasePrefix = ('{0}\' -f $GhcupBasePrefix)
+    }
+  
+    if (!($GhcupBasePrefix)) {
+      Print-Msg -color Red -msg "No directory specified!"
+    } elseif (!(Test-Path -LiteralPath ('{0}' -f $GhcupBasePrefix))) {
+      Print-Msg -color Red -msg "Directory does not exist, need to specify an existing Drive/Directory"
+    } elseif (!(Split-Path -IsAbsolute -Path "$GhcupBasePrefix")) {
+      Print-Msg -color Red -msg "Invalid/Non-absolute Path specified"
+    } else {
+      Break
+    }
+  }
+}
+
+Print-Msg -msg ('Setting env variable GHCUP_INSTALL_BASE_PREFIX to ''{0}''' -f $GhcupBasePrefix)
+$null = [Environment]::SetEnvironmentVariable("GHCUP_INSTALL_BASE_PREFIX", $GhcupBasePrefix, [System.EnvironmentVariableTarget]::User)
+
+
+$GhcupDir = ('{0}\ghcup' -f $GhcupBasePrefix)
 $MsysDir = ('{0}\msys64' -f $GhcupDir)
 $Bash = ('{0}\usr\bin\bash' -f $MsysDir)
+$BootstrapUrl = 'https://www.haskell.org/ghcup/sh/bootstrap-haskell'
+$GhcupMsys2 = [System.Environment]::GetEnvironmentVariable('GHCUP_MSYS2', 'user')

 Print-Msg -msg 'Preparing for GHCup installation...'

-if (Test-Path -Path ('{0}' -f $GhcupDir)) {
-  $decision = $Host.UI.PromptForChoice('Install', 'GHCup is already installed, what do you want to do?', @('&Reinstall'
-                                                                                                           '&Continue'
-                                                                                                           '&Abort'), 1)
+if (Test-Path -LiteralPath ('{0}' -f $GhcupDir)) {
+  Print-Msg -msg ('GHCup already installed at ''{0}''...' -f $GhcupDir)
+  if ($Overwrite) {
+    $decision = 0
+  } elseif (!($Silent)) {
+    $decision = $Host.UI.PromptForChoice('Install GHCup'
+                                        , 'GHCup is already installed, what do you want to do?'
+                                        , [System.Management.Automation.Host.ChoiceDescription[]] @('&Reinstall'
+                                            '&Continue'
+                                            '&Abort'), 1)
+  } else {
+    $decision = 1
+  }
+
  if ($decision -eq 0) {
    $suffix = [IO.Path]::GetRandomFileName()
    Print-Msg -msg ('Backing up {0} to {0}-{1} ...' -f $GhcupDir, $suffix)
@@ -110,7 +220,7 @@ if (Test-Path -Path ('{0}' -f $GhcupDir)) {
  } elseif ($decision -eq 1) {
    Print-Msg -msg 'Continuing installation...'
  } elseif ($decision -eq 2) {
-    Exit
+    Exit 0
  }
 }

@@ -121,6 +231,16 @@ $null = New-Item -Path ('{0}' -f $GhcupDir) -Name 'bin' -ItemType 'directory' -E
 Print-Msg -msg 'First checking for Msys2...'

 if (!(Test-Path -Path ('{0}' -f $MsysDir))) {
+  if ($Silent) {
+    $msys2Decision = 0
+  } else {
+    $msys2Decision = $Host.UI.PromptForChoice('Install MSys2'
+        , 'Do you want GHCup to install a default MSys2 toolchain (recommended)?'
+        , [System.Management.Automation.Host.ChoiceDescription[]] @('&Yes'
+            '&No'), 0)
+  }
+
+  if ($msys2Decision -eq 0) {
    Print-Msg -msg ('...Msys2 doesn''t exist, installing into {0} ...this may take a while' -f $MsysDir)

    # Download the archive
@@ -128,7 +248,7 @@ if (!(Test-Path -Path ('{0}' -f $MsysDir))) {
    $archive = 'msys2-x86_64-latest.sfx.exe'
    
    if (Get-Command -Name 'curl.exe' -ErrorAction SilentlyContinue) {
-      curl.exe -o ('{0}\{1}' -f $env:TEMP, $archive) ('https://repo.msys2.org/distrib/{0}' -f $archive)
+      Exec "curl.exe" '-o' ('{0}\{1}' -f $env:TEMP, $archive) ('https://repo.msys2.org/distrib/{0}' -f $archive)
    } else {
      Get-FileWCSynchronous -url ('https://repo.msys2.org/distrib/{0}' -f $archive) -destinationFolder "$env:TEMP" -includeStats
    }
@@ -138,24 +258,62 @@ if (!(Test-Path -Path ('{0}' -f $MsysDir))) {
    Remove-Item -Path ('{0}/{1}' -f $env:TEMP, $archive)

    Print-Msg -msg 'Processing MSYS2 bash for first time use...'
-    & "$Bash" -lc 'exit'
+    Exec "$Bash" '-lc' 'exit'

-    & "$env:windir\system32\taskkill.exe" /F /FI `"MODULES eq msys-2.0.dll`"
+    Exec "$env:windir\system32\taskkill.exe" /F /FI `"MODULES eq msys-2.0.dll`"

    Print-Msg -msg 'Upgrading full system...'
-    & "$Bash" -lc 'pacman --noconfirm -Syuu'
+    Exec "$Bash" '-lc' 'pacman --noconfirm -Syuu'

    Print-Msg -msg 'Upgrading full system twice...'
-    & "$Bash" -lc 'pacman --noconfirm -Syuu'
+    Exec "$Bash" '-lc' 'pacman --noconfirm -Syuu'

-    Print-Msg -msg 'Installing GHC Build Dependencies...'
-    & "$Bash" -lc 'pacman --noconfirm -S --needed git tar curl wget base-devel gettext binutils autoconf make libtool automake python p7zip patch unzip mingw-w64-x86_64-toolchain mingw-w64-x86_64-gcc mingw-w64-x86_64-gdb mingw-w64-x86_64-python2 mingw-w64-x86_64-python3-sphinx'
+    if ($Quick) {
+      $ghcBuildDeps = $Quick
+    } elseif (!($Silent)) {
+      $ghcBuildDeps = $Host.UI.PromptForChoice('Install Dependencies'
+        , 'Install a standard set of mingw64 packages to be able to build various haskell packages requiring unix libraries? (recommended, however this might take a while... if you skip this, you might have to do it manually later)'
+        , [System.Management.Automation.Host.ChoiceDescription[]] @('&Yes'
+            '&No'), 0)
+    } else {
+      $ghcBuildDeps = 0
+    }
+    if ($ghcBuildDeps -eq 0) {
+      Print-Msg -msg 'Installing Dependencies...'
+      Exec "$Bash" '-lc' 'pacman --noconfirm -S --needed git tar curl wget base-devel gettext binutils autoconf make libtool automake pkgconf python p7zip patch unzip'
+    }

    Print-Msg -msg 'Updating SSL root certificate authorities...'
-    & "$Bash" -lc 'pacman --noconfirm -S ca-certificates'
+    Exec "$Bash" '-lc' 'pacman --noconfirm -S ca-certificates'

    Print-Msg -msg 'Setting default home directory...'
-    & "$Bash" -lc "sed -i -e 's/db_home:.*$/db_home: windows/' /etc/nsswitch.conf"
+    Exec "$Bash" '-lc' "sed -i -e 's/db_home:.*$/db_home: windows/' /etc/nsswitch.conf"
+  } elseif ($msys2Decision -eq 1) {
+    Print-Msg -color Yellow -msg 'Skipping MSys2 installation.'
+    while ($true) {
+      if ($GhcupMsys2) {
+        $defaultMsys2Dir = $GhcupMsys2
+        Print-Msg -color Magenta -msg ('Input existing MSys2 toolchain directory. Press enter to accept the default [{0}]:' -f $defaultMsys2Dir)
+        $MsysDirPrompt = Read-Host
+        $MsysDir = ($defaultMsys2Dir,$MsysDirPrompt)[[bool]$MsysDirPrompt]
+      } else {
+        Print-Msg -color Magenta -msg 'Input existing MSys2 toolchain directory:' 
+        $MsysDir = Read-Host
+      }
+      if (!($MsysDir)) {
+        Print-Msg -color Red -msg "No directory specified!"         
+      } elseif (!(Test-Path -LiteralPath ('{0}' -f $MsysDir))) {
+        Print-Msg -color Red -msg ('MSys2 installation at ''{0}'' could not be found!' -f $MsysDir)
+      } elseif (!(Split-Path -IsAbsolute -Path "$MsysDir")) {
+        Print-Msg -color Red -msg "Invalid/Non-absolute Path specified"
+      } else {
+        Break
+      }
+    }
+    Print-Msg -msg ('Setting GHCUP_MSYS2 env var to ''{0}''' -f $MsysDir)
+    $null = [Environment]::SetEnvironmentVariable("GHCUP_MSYS2", $MsysDir, [System.EnvironmentVariableTarget]::User)
+    $Bash = ('{0}\usr\bin\bash' -f $MsysDir)
+  }
 } else {
    Print-Msg -msg ('...Msys2 found in {0} ...skipping Msys2 installation.' -f $MsysDir)
 }
@@ -165,10 +323,58 @@ Create-Shortcut -SourceExe ('{0}\msys2_shell.cmd' -f $MsysDir) -ArgumentsToSourc
 Create-Shortcut -SourceExe 'https://www.msys2.org/docs/package-management' -ArgumentsToSourceExe '' -DestinationPath ('{0}\Desktop\Mingw package management docs.url' -f $HOME)

 Print-Msg -msg ('Adding {0}\bin to Users Path...' -f $GhcupDir)
-Add-EnvPath -Path ('{0}\bin' -f $GhcupDir) -Container 'User'
+Add-EnvPath -Path ('{0}\bin' -f ([System.IO.Path]::GetFullPath("$GhcupDir"))) -Container 'User'
+
+if ($CabalDir) {
+  $CabDirEnv = $CabalDir
+  if (!($CabDirEnv)) {
+    Print-Msg -color Red -msg "No directory specified!"
+    Exit 1        
+  } elseif (!(Split-Path -IsAbsolute -Path "$CabDirEnv")) {
+    Print-Msg -color Red -msg "Invalid/Non-absolute Path specified"
+    Exit 1
+  }
+} elseif (!($Silent)) {
+  while ($true) {
+
+    $defaultCabalDir = ('{0}\cabal' -f $GhcupBasePrefix)
+    Print-Msg -color Magenta -msg ('Specify Cabal directory (this is where haskell packages end up). Press enter to accept the default [{0}]:' -f $defaultCabalDir)
+    $CabalDirPrompt = Read-Host
+    $CabDirEnv = ($defaultCabalDir,$CabalDirPrompt)[[bool]$CabalDirPrompt]
+
+    if (!($CabDirEnv)) {
+      Print-Msg -color Red -msg "No directory specified!"         
+    } elseif (!(Split-Path -IsAbsolute -Path "$CabDirEnv")) {
+      Print-Msg -color Red -msg "Invalid/Non-absolute Path specified"
+    } else {
+      Break
+    }
+  }
+} else {
+  $CabDirEnv = ('{0}\cabal' -f $GhcupBasePrefix)
+}
+
+$CabalDirFull = [System.IO.Path]::GetFullPath("$CabDirEnv")
+Print-Msg -msg ('Setting CABAL_DIR to ''{0}''' -f $CabalDirFull)
+$null = [Environment]::SetEnvironmentVariable("CABAL_DIR", $CabalDirFull, [System.EnvironmentVariableTarget]::User)

 Print-Msg -msg 'Starting GHCup installer...'
-& "$Bash" -lc "export PATH=`"/c/ghcup/bin:`$PATH`" ; curl --proto =https --tlsv1.2 -sSf https://gitlab.haskell.org/haskell/ghcup-hs/-/raw/windows-support/bootstrap-haskell | bash"
+
+$Msys2Shell = ('{0}\msys2_shell.cmd' -f $MsysDir)
+
+if ($Silent) {
+  $SilentExport = 'export BOOTSTRAP_HASKELL_NONINTERACTIVE=1 ;'
+} else {
+  $SilentExport = ''
+}
+
+if ((Get-Process -ID $PID).ProcessName.StartsWith("bootstrap-haskell")) {
+  Exec "$Bash" '-lc' ('{4} [ -n ''{1}'' ] && export GHCUP_MSYS2=$(cygpath -m ''{1}'') ; [ -n ''{2}'' ] && export GHCUP_INSTALL_BASE_PREFIX=$(cygpath -m ''{2}/'') ; export PATH=$(cygpath -u ''{3}/bin''):$PATH ; export CABAL_DIR=''{5}'' ; curl --proto ''=https'' --tlsv1.2 -sSf {0} | bash' -f $BootstrapUrl, $MsysDir, $GhcupBasePrefix, $GhcupDir, $SilentExport, $CabalDirFull)
+} else {
+  Exec "$Msys2Shell" '-mingw64' '-mintty' '-c' ('{4} [ -n ''{1}'' ] && export GHCUP_MSYS2=$(cygpath -m ''{1}'') ; [ -n ''{2}'' ] && export GHCUP_INSTALL_BASE_PREFIX=$(cygpath -m ''{2}/'') ; export PATH=$(cygpath -u ''{3}/bin''):$PATH ; export CABAL_DIR=''{5}'' ; trap ''echo Press any key to exit && read -n 1 && exit'' 2 ; curl --proto =https --tlsv1.2 -sSf -k {0} | bash ; echo ''Press any key to exit'' && read -n 1' -f $BootstrapUrl, $MsysDir, $GhcupBasePrefix, $GhcupDir, $SilentExport, $CabalDirFull)
+}
+
+
 # SIG # Begin signature block
  # MIID4QYJKoZIhvcNAQcCoIID0jCCA84CAQExCzAJBgUrDgMCGgUAMGkGCisGAQQB
  # gjcCAQSgWzBZMDQGCisGAQQBgjcCAR4wJgIDAQAABBAfzDtgWUsITrck0sYpfvNR
@@ -192,3 +398,4 @@ Print-Msg -msg 'Starting GHCup installer...'
  # aED5Ujwyq3Qre+TGVRUqwkEauDhQiX2A008G00fRO6+di6yJRCRn5eaRAbdU3Xww
  # E5VhEwLBnwzWrvLKtdEclhgUCo5Tq87QMXVdgX4aRmunl4ZE+Q==
 # SIG # End signature block
+
--- a/cabal.project
+++ b/cabal.project
@@ -3,7 +3,6 @@ packages: ./ghcup.cabal
 optimization: 2

 package ghcup
-    ghc-options: -O2 -rtsopts
    tests: True
    flags: +tui

@@ -12,6 +11,11 @@ source-repository-package
    location: https://github.com/Bodigrim/tar
    tag: ac197ec7ea4838dc2b4e22b9b888b080cedf29cf

+source-repository-package
+    type: git
+    location: https://github.com/bgamari/terminal-size
+    tag: 34ea816bd63f75f800eedac12c6908c6f3736036
+
 constraints: http-io-streams -brotli

 package libarchive
--- a/cabal.project.freeze
+++ b/cabal.project.freeze
@@ -0,0 +1,2 @@
+-- windows picks weird version
+constraints: any.hsc2hs ==0.68.7
--- a/ghcup-0.0.4.yaml
+++ b/ghcup-0.0.4.yaml
@@ -127,13 +127,6 @@ toolRequirements:
          - libffi
          - libiconv
          notes: ''
-      Windows:
-        unknown_versioning:
-          distroPKGs: []
-          notes: On Windows, msys2 should already have been set up during the installation,
-            so most users should just press ENTER.
-            If you are installing manually, make sure to have a working mingw64 toolchain and
-            shell.
 ghcupDownloads:
  GHC:
    7.10.3:
@@ -177,11 +170,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/7.10.3/ghc-7.10.3-x86_64-portbld-freebsd.tar.bz2
              dlSubdir: ghc-7.10.3
              dlHash: 2aa396edd2bb651f4bc7eef7a396913ea24923de5aafdc76df6295333e487e48
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/7.10.3/ghc-7.10.3-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-7.10.3
-              dlHash: 63e1689fc9e2809ae4d7f422b4dc810052e54c9aa2afd08746e234180e711dde
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-7103-32-deb8
@@ -248,11 +236,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.0.2/ghc-8.0.2-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.0.2
              dlHash: b36a20e5cae24d70bbb6116ae486f21811e9384f15d3892d260f02fba3e3bb8c
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.0.2/ghc-8.0.2-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.0.2
-              dlHash: 8c42c1f4af995205b9816a1e97e2752fe758544c1f5fe77958cdcd319c9c2d53
        A_32:
          Linux_Debian:
            '( >= 7 && < 8 )':
@@ -317,11 +300,6 @@ ghcupDownloads:
              dlSubdir: ghc-8.2.2
              dlHash: cd351c704b92b9af23994024df07de8ca7090ea7675d5c8b14b2be857a46d804
            unknown_versioning: *ghc-822-64-fbsd11
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.2.2/ghc-8.2.2-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.2.2
-              dlHash: 1e033df2092aa546e763e7be63167720b32df64f76673ea1ce7ae7c9f564b223
        A_32:
          Linux_Debian:
            '( >= 7 && < 8 )':
@@ -381,11 +359,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.4.1/ghc-8.4.1-x86_64-portbld11-freebsd.tar.xz
              dlSubdir: ghc-8.4.1
              dlHash: e748daec098445c6190090fe32bb2817a1140553be5acd2188e1af05ad24e5aa
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.4.1/ghc-8.4.1-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.4.1
-              dlHash: 328b013fc651d34e075019107e58bb6c8a578f0155cf3ad4557e6f2661b03131
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-841-32-deb8
@@ -441,11 +414,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.4.2/ghc-8.4.2-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.4.2
              dlHash: e9ed417fdf94c2ff2c6e344ed16f332bf6b591511f6442c0d9ea94854882b66c
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.4.2/ghc-8.4.2-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.4.2
-              dlHash: 797634aa9812fc6b2084a24ddb4fde44fa83a2f59daea82e0af81ca3dd323fde
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-842-32-deb8
@@ -496,11 +464,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.4.3/ghc-8.4.3-x86_64-apple-darwin.tar.xz
              dlSubdir: ghc-8.4.3
              dlHash: af0b455f6c46b9802b4b48dad996619cfa27cc6e2bf2ce5532387b4a8c00aa64
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.4.3/ghc-8.4.3-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.4.3
-              dlHash: 8a83cfbf9ae84de0443c39c93b931693bdf2a6d4bf163ffb41855f80f4bf883e
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-843-32-deb8
@@ -569,11 +532,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.4.4/ghc-8.4.4-x86_64-portbld-freebsd11.tar.xz
              dlSubdir: ghc-8.4.4
              dlHash: 44fbd142d1c355d6110595c59c760e2c73866ff9259ec85ebf814edb244d1940
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.4.4/ghc-8.4.4-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.4.4
-              dlHash: da29dbb0f1199611c7d5bb7b0dd6a7426ca98f67dfd6da1526b033cd3830dc05
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-844-32-deb8
@@ -634,11 +592,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.6.1/ghc-8.6.1-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.6.1
              dlHash: 51403b054a3a649039ac988e1d1112561f96750bfced63df864091a3fab36f08
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.6.1/ghc-8.6.1-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.6.1
-              dlHash: 7316d9cb5e486460476754f872c7bac30ee2082e42f46da4342f872d10b88099
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-861-32-deb8
@@ -685,11 +638,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.6.2/ghc-8.6.2-x86_64-apple-darwin.tar.xz
              dlSubdir: ghc-8.6.2
              dlHash: 8ec46a25872226dd7e5cf7271e3f3450c05f32144b96e6b9cb44cc4079db50dc
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.6.2/ghc-8.6.2-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.6.2
-              dlHash: 9a398e133cab09ff2610834337355d4e26c35e0665403fb9ff8db79315f74d3d
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-862-32-deb8
@@ -754,11 +702,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.6.3/ghc-8.6.3-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.6.3
              dlHash: bc2419fa180f8a7808c49775987866435995df9bdd9ce08bcd38352d63ba6031
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.6.3/ghc-8.6.3-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.6.3
-              dlHash: 2fec383904e5fa79413e9afd328faf9bc700006c8c3d4bcdd8d4f2ccf0f7fa2a
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-863-32-deb8
@@ -809,11 +752,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.6.4/ghc-8.6.4-x86_64-apple-darwin.tar.xz
              dlSubdir: ghc-8.6.4
              dlHash: cccb58f142fe41b601d73690809f6089f7715b6a50a09aa3d0104176ab4db09e
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.6.4/ghc-8.6.4-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.6.4
-              dlHash: e8d021b7a90772fc559862079da20538498d991956d7557b468ca19ddda22a08
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-864-32-deb9
@@ -882,11 +820,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/ghcup/unofficial-bindists/ghc/8.6.5/ghc-8.6.5-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.6.5
              dlHash: 83a3059a630d40a98e26cb5b520354e12094a96e36ba2f5ab002dad94cf2fb37
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.6.5/ghc-8.6.5-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.6.5
-              dlHash: 457024c6ea43bdce340af428d86319931f267089398b859b00efdfe2fd4ce93f
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-865-32-deb9
@@ -957,11 +890,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.8.1/ghc-8.8.1-x86_64-apple-darwin.tar.xz
              dlSubdir: ghc-8.8.1
              dlHash: 38c8917b47c31bedf58c9305dfca3abe198d8d35570366f0773c4e2948bd8abe
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.8.1/ghc-8.8.1-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.8.1
-              dlHash: 29e56e6af38017a5a76b2b6995a39d3988fa58131e4b55b62dd317ba7186ac9b
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-881-32-deb9
@@ -1021,11 +949,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.8.2/ghc-8.8.2-x86_64-apple-darwin.tar.xz
              dlSubdir: ghc-8.8.2
              dlHash: 25c5c1a70036abf3f22b2b19c10d26adfdb08e8f8574f89d4b2042de5947f990
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.8.2/ghc-8.8.2-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.8.2
-              dlHash: e25d9b16ee62cafc7387af2cd021eea676a99cd2c32b83533b016162c63065d9
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-882-32-deb9
@@ -1090,11 +1013,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/ghcup/unofficial-bindists/ghc/8.8.3/ghc-8.8.3-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.8.3
              dlHash: 569719075b4d14b3875a899df522090ae31e6fe085e6dffe518e875b09a2f0be
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.8.3/ghc-8.8.3-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.8.3
-              dlHash: e22586762af0911c06e8140f1792e3ca381a3a482a20d67b9054883038b3a422
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-883-32-deb9
@@ -1169,11 +1087,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/ghcup/unofficial-bindists/ghc/8.8.4/ghc-8.8.4-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.8.4
              dlHash: 8cebe5ccf454e82acd1ff52ca57590d1ab0f3f44a981b46257ec12158c8c447e
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.8.4/ghc-8.8.4-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.8.4
-              dlHash: d185055d2c8dc3bfe5b88afd59d6877eb1e722b672d1c9649f18296e148ed71f
        A_32:
          Linux_Debian:
            unknown_versioning: &ghc-884-32-deb9
@@ -1251,11 +1164,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/ghcup/unofficial-bindists/ghc/8.10.1/ghc-8.10.1-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.10.1
              dlHash: e8646ec9b60fd40aa9505ee055f22f04601290ab7a1342c2cf37c34de9d3f142
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.10.1/ghc-8.10.1-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.10.1
-              dlHash: 38a3166ea50cccd5bae7e1680eae3aae2b4ae31b61f82a1d8168fb821f43bd67
        A_32:
          Linux_Debian:
            '( >= 9 && < 10 )': &ghc-8101-32-deb9
@@ -1346,11 +1254,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.10.2/ghc-8.10.2-x86_64-unknown-freebsd.tar.xz
              dlSubdir: ghc-8.10.2
              dlHash: 9e5957f3497f4b58ecd3699568d9caaa11a47a6d7e902032c261e450fa0f6686
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.10.2/ghc-8.10.2-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.10.2
-              dlHash: dcae4c173b9896e07ff048de5509aa0a4537233150e06e5ce8848303dfadc176
        A_32:
          Linux_Debian:
            '( >= 9 && < 10 )': &ghc-8102-32-deb9
@@ -1383,6 +1286,7 @@ ghcupDownloads:
              dlHash: bb9c97826b1f4d7a8ef8bce0616b612f1ded10480ef10fcf7fb4e6d10a6681c8
    8.10.3:
      viTags:
+      - old
      - base-4.14.1.0
      viChangeLog: https://downloads.haskell.org/~ghc/8.10.3/docs/html/users_guide/8.10.3-notes.html
      viSourceDL:
@@ -1440,11 +1344,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.10.3/ghc-8.10.3-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.10.3
              dlHash: 749007e995104db05cf6e3ad5bc36238cab8afac8055145661e5730e8f8af040
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.10.3/ghc-8.10.3-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.10.3
-              dlHash: 927a6c699533a115cd49772ef2c753d9af2c13bf9f0b2d3bd13645cc6a144ee3
        A_32:
          Linux_Debian:
            '( >= 9 && < 10 )': &ghc-8103-32-deb9
@@ -1477,7 +1376,6 @@ ghcupDownloads:
              dlHash: b823b58cae36fbac0741680ca7605180fa4cf4c6ae439123d282184b94d32fd6
    8.10.4:
      viTags:
-      - Recommended
      - base-4.14.1.0
      viChangeLog: https://downloads.haskell.org/~ghc/8.10.4/docs/html/users_guide/8.10.4-notes.html
      viSourceDL:
@@ -1485,7 +1383,7 @@ ghcupDownloads:
        dlSubdir: ghc-8.10.4
        dlHash: 52af871b4e08550257d720c2944ac85727d0b948407cef1bebfe7508c224910e
      viPostRemove: *ghc-post-remove
-      viPreCompile: "If you have autoconf >= 2.70 you'll need this patch https://gitlab.haskell.org/ghc/ghc/-/snippets/2040 (see the --patchdir option)"
+      viPreCompile: &ghc-pre-compile "If you have autoconf >= 2.70 you'll need this patch https://gitlab.haskell.org/ghc/ghc/-/snippets/2040 (see the --patchdir option)"
      viArch:
        A_64:
          Linux_Debian:
@@ -1536,11 +1434,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.10.4/ghc-8.10.4-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-8.10.4
              dlHash: c9776a2ccf9629b03e967206a507fcdcb6c5189800a626e9461ababf6733c357
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/8.10.4/ghc-8.10.4-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-8.10.4
-              dlHash: e9175a276504c3390a5e0084954e6997d56078737dbe7158049518892cf6bfb2
        A_32:
          Linux_Debian:
            '( >= 9 && < 10 )': &ghc-8104-32-deb9
@@ -1571,6 +1464,97 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.10.4/ghc-8.10.4-armv7-deb10-linux.tar.xz
              dlSubdir: ghc-8.10.4
              dlHash: 0d18ef83593272f6196a41cc3abdc48dfe5e14372db75d71ea19fe35320c4e81
+    8.10.5:
+      viTags:
+      - Recommended
+      - base-4.14.2.0
+      viChangeLog: https://downloads.haskell.org/~ghc/8.10.5/docs/html/users_guide/8.10.5-notes.html
+      viSourceDL:
+        dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-src.tar.xz
+        dlSubdir: ghc-8.10.5
+        dlHash: f10941f16e4fbd98580ab5241b9271bb0851304560c4d5ca127e3b0e20e3076f
+      viPostRemove: *ghc-post-remove
+      viPreCompile: *ghc-pre-compile
+      viArch:
+        A_64:
+          Linux_Debian:
+            '( >= 9 && < 10 )': &ghc-8105-64-deb9
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-deb9-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 15e71325c3bdfe3804be0f84c2fc5c913d811322d19b0f4d4cff20f29cdd804d
+            '( >= 10 && < 11 )': &ghc-8105-64-deb10
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-deb10-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: bc623c20ca4c5c18e952071ba14aa0cfc5c94d34219bffaa615f7b491f376787
+            unknown_versioning: *ghc-8105-64-deb9
+          Linux_Ubuntu:
+            unknown_versioning: &ghc-8105-64-fedora
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-fedora27-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 73528ebfb219b50aa9042ee51a0a2bd764828d605f058404989d0b645752d210
+            '( >= 16 && < 19 )': *ghc-8105-64-deb9
+          Linux_Mint:
+            unknown_versioning: *ghc-8105-64-deb10
+          Linux_Fedora:
+            '( >= 27 && < 28 )': *ghc-8105-64-fedora
+            unknown_versioning: *ghc-8105-64-fedora
+          Linux_CentOS:
+            '( >= 7 && < 8 )': &ghc-8105-64-centos
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-centos7-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 4cdb259ec74d1408dab45dab20dcedc21690f39921c2ea4546486fb3e81f4fbd
+            unknown_versioning: *ghc-8105-64-centos
+          Linux_RedHat:
+            unknown_versioning: *ghc-8105-64-centos
+          Linux_Alpine:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-alpine3.10-linux-integer-simple.tar.xz
+              dlSubdir: ghc-8.10.5-x86_64-unknown-linux
+              dlHash: f4d7cd9ed12a4b8592219c9a63a86db1a256a09fa9e6ed755a60afc57dc782e2
+          Linux_AmazonLinux:
+            unknown_versioning: *ghc-8105-64-centos
+          Linux_UnknownLinux:
+            unknown_versioning: *ghc-8105-64-fedora
+          Darwin:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-apple-darwin.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: ef0f47eff8962d58fa447123636cf8ef31c1e5b2d0ae90177d3388861ddf4a22
+          FreeBSD:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/ghc/8.10.5/ghc-8.10.5-x86_64-portbld-freebsd.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 11a0b490bfb2f57b5bc87c69c197542eafce1b4991cc22f625179a6c6e567834
+        A_32:
+          Linux_Debian:
+            '( >= 9 && < 10 )': &ghc-8105-32-deb9
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-i386-deb9-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 0ccb5b2c1222374874795c35410754dd650f649b774872abbea2a4ef21ac9c9d
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_Ubuntu:
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_Mint:
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_UnknownLinux:
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_Alpine:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/ghc/8.10.5/ghc-8.10.5-i386-alpine-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 0e91abe61607f9375d4e252ee9c261e4856df396f60641bb1b880ab8a3a83ea7
+        A_ARM64:
+          Linux_UnknownLinux:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-aarch64-deb10-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 9a085cd8a7f8e0ace21ac67dbf659a56fcf41564b48817ba42cd8a1aac7f0ddc
+        A_ARM:
+          Linux_UnknownLinux:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-armv7-deb10-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 56170d1a8450e18b7eb9c23c94723da352815b27ec250bb23742a62f16dcab6c
    9.0.1:
      viTags:
      - Latest
@@ -1631,11 +1615,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/9.0.1/ghc-9.0.1-x86_64-portbld-freebsd.tar.xz
              dlSubdir: ghc-9.0.1
              dlHash: 9dbc06d8832cae5c9f86dd7b2db729b3748a47beb4fd4b1e62bb66119817c3c1
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/9.0.1/ghc-9.0.1-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-9.0.1-x86_64-unknown-mingw32
-              dlHash: 4f4ab118df01cbc7e7c510096deca0cb25025339a97730de0466416296202493
        A_32:
          Linux_Debian:
            '( >= 9 && < 10 )': &ghc-901-32-deb9
@@ -1726,11 +1705,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/9.2.1-alpha2/ghc-9.2.0.20210422-x86_64-apple-darwin.tar.xz
              dlSubdir: ghc-9.2.0.20210422
              dlHash: 8884c059f2b76e4c4309ff6bd7a7dde37663f751fd26220e9a2bcabb4d69a401
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghc/9.2.1-alpha2/ghc-9.2.0.20210422-x86_64-unknown-mingw32.tar.xz
-              dlSubdir: ghc-9.0.1-x86_64-unknown-mingw32
-              dlHash: 33f173b754d18f26bb27f52bb77a92fd22a48675daa2b43a1879bf01dddd7e8f
        A_32:
          Linux_Debian:
            '( >= 9 && < 10 )': &ghc-921-alpha2-32-deb9
@@ -1783,11 +1757,6 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~cabal/cabal-install-2.4.1.0/cabal-install-2.4.1.0-x86_64-portbld-freebsd.tar.xz
              dlSubdir:
              dlHash: 33b7d37ea0688c93436eac9ec139d9967687875aa1fa13f2bb73bf05a9a59a1d
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~cabal/cabal-install-2.4.1.0/cabal-install-2.4.1.0-x86_64-unknown-mingw32.zip
-              dlSubdir:
-              dlHash: 95f233efedb1ebf0e6db015fa2f55c1ed00b9938d207ec63c066f706fb4b6373
        A_32:
          Linux_UnknownLinux:
            unknown_versioning:
@@ -1816,11 +1785,6 @@ ghcupDownloads:
            unknown_versioning:
              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.0.0.0/cabal-install-3.0.0.0-x86_64-portbld-freebsd.tar.xz
              dlHash: 2240842ab2ae7b955feb8b526aba1c7991248c803383107adf39990441294d2a
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.0.0.0/cabal-install-3.0.0.0-x86_64-unknown-mingw32.zip
-              dlSubdir:
-              dlHash: 8889963ebef5e829d86329fdb59832c107efd117cf7862a605f2fe2d2360de1f
        A_32:
          Linux_Alpine:
            unknown_versioning:
@@ -1852,11 +1816,6 @@ ghcupDownloads:
            unknown_versioning:
              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.2.0.0/cabal-install-3.2.0.0-x86_64-portbld-freebsd.tar.xz
              dlHash: f1e35151cca91541b0fb4bdb3ed18f3c348038eab751845ad19c11307d66c273
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.2.0.0/cabal-install-3.2.0.0-x86_64-unknown-mingw32.zip
-              dlSubdir:
-              dlHash: 17778c3ade0482bc37f451eec326f8fce8fbe1f12b1d6aacb2e2b9e34786c054
        A_32:
          Linux_Alpine:
            unknown_versioning:
@@ -1891,11 +1850,6 @@ ghcupDownloads:
            unknown_versioning:
              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.4.0.0/cabal-install-3.4.0.0-x86_64-freebsd-12.1-release.tar.xz
              dlHash: a1e2db664ec00e42a1e071a4181f6476f6e0bad321f1ddc0cf27831119f4c6d4
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.4.0.0/cabal-install-3.4.0.0-x86_64-windows.zip
-              dlSubdir:
-              dlHash: 860fff2d39a82d1dc0ca924a77164d0988af49c2c5f45e15d615144122beb647
        A_32:
          Linux_UnknownLinux:
            unknown_versioning: &cabal-3400-32
@@ -1914,7 +1868,7 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal/3.4.0.0/cabal-install-3.4.0.0-armv7-linux-bootstrapped.tar.xz
              dlHash: 16c0d1eaba24bed14f3e152970179a45d9f9bb5cc839b2c210ad06eb7d4826ed
  GHCup:
-    0.1.14.1:
+    0.1.15.1:
      viTags:
      - Recommended
      - Latest
@@ -1924,39 +1878,39 @@ ghcupDownloads:
        A_64:
          Linux_UnknownLinux:
            unknown_versioning: &ghcup-64
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/x86_64-linux-ghcup-0.1.14.1
-              dlHash: 59e31b2ede3ed20f79dce0f8ba0a68b6fb25e5f00ba2d7243f6a8af68d979ff5
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-linux-ghcup-0.1.15.1
+              dlHash: 871c9dc1bfbf7df6fe3b9b7250c20a3dae8a7aee171712a3e63689ab75bc9439
          Darwin:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/x86_64-apple-darwin-ghcup-0.1.14.1
-              dlHash: 3e1dd173b3e7b5d90dcdece423c3ddd3efb4c83e964967b0fb574c9b7b2c44e1
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-apple-darwin-ghcup-0.1.15.1
+              dlHash: 7cd67b554fc58c4ffb224b73e369c5dd27c5276c01f102f6423230b34cc635bc
          FreeBSD:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/x86_64-portbld-freebsd-ghcup-0.1.14.1
-              dlHash: 89a70980d77888dae8b9fd0f05e7a7920f421bc3bb5192da8e73fd4e7b4cb86f
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/ghcup/tmp/ghcup.exe
-              dlHash: e6dc0b337b29164d5e4a299e572955591b1b6e5d4d11e895c8cbc05666d98ad5
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-portbld-freebsd-ghcup-0.1.15.1
+              dlHash: b4ad9c9f1a878560e8f770d985d53b8fb70582baf99e40e53ec9ee97dc47ae64
          Linux_Alpine:
            unknown_versioning: *ghcup-64
        A_32:
          Linux_UnknownLinux:
            unknown_versioning: &ghcup-32
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/i386-linux-ghcup-0.1.14.1
-              dlHash: 610aac7c3be3ba3874c07b9cae5b2ca0da9a92bf381afc2597bd2dc9c70aae0c
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/i386-linux-ghcup-0.1.15.1
+              dlHash: 0c1dcbdd7cfa8accdfbe14c623924f3ca29a35d32a2ac3e61f0eb322855e2cb1
          Linux_Alpine:
            unknown_versioning: *ghcup-32
        A_ARM64:
          Linux_UnknownLinux:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/aarch64-linux-ghcup-0.1.14.1
-              dlHash: e9ae07b7d41ea03e6af9c1f3587f61287827c4e29478b6a5d46ea1ce5af4cee5
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/aarch64-linux-ghcup-0.1.15.1
+              dlHash: 7fa29d8e9a9fe3d1e3a63a1d16fc3550128edbdb9b5b5dff7974358c4dab192c
+          Darwin:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/aarch64-apple-darwin-ghcup-0.1.15.1
+              dlHash: 6a743cd50e8124ac2de8be77013d49dcf3b99ce7cc463ec86ed99a904a51dfd9
        A_ARM:
          Linux_UnknownLinux:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/armv7-linux-ghcup-0.1.14.1
-              dlHash: 646832030efbc0a848df24c08b5eb7507bd15d1c2eb95fea6d9d03890f3662be
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/armv7-linux-ghcup-0.1.15.1
+              dlHash: 77ee5d9828c2ba771127274e301e81412b9f29af2d65dd85dada4786d9438c2c
  HLS:
    1.1.0:
      viTags:
@@ -1974,65 +1928,5 @@ ghcupDownloads:
            unknown_versioning:
              dlUri: https://github.com/haskell/haskell-language-server/releases/download/1.1.0/haskell-language-server-macOS-1.1.0.tar.gz
              dlHash: 4e89b192e2f49637d772e974f2c17b16da067ecd5912575eaa542551de97681b
-          Windows:
-            unknown_versioning:
-              dlUri: https://downloads.haskell.org/ghcup/unofficial-bindists/hls/1.1.0/haskell-language-server-Windows-1.1.0.tar.gz
-              dlHash: a1d3f451e64a041aa527a25da29e4716a2de6ae347cef4ef9312fc7611e168cc
          Linux_Alpine:
            unknown_versioning: *hls-64
-  Stack:
-    2.5.1:
-      viTags: []
-      viChangeLog: https://github.com/commercialhaskell/stack/blob/master/ChangeLog.md#v251
-      viPostInstall: &stack-post "Stack manages GHC versions internally by default. In order to make it use ghcup installed GHC versions have a look at the options 'system-ghc', 'compiler-check' and 'compiler': https://docs.haskellstack.org/en/stable/yaml_configuration/#system-ghc"
-      viArch:
-        A_64:
-          Linux_UnknownLinux:
-            unknown_versioning: &stack-251-64
-              dlUri: https://github.com/commercialhaskell/stack/releases/download/v2.5.1/stack-2.5.1-linux-x86_64.tar.gz
-              dlHash: c83b6c93d6541c0bce2175085a04062020f4160a86116e20f3b343b562f2d1e8
-              dlSubdir:
-                RegexDir: "stack-.*"
-          Darwin:
-            unknown_versioning:
-              dlUri: https://github.com/commercialhaskell/stack/releases/download/v2.5.1/stack-2.5.1-osx-x86_64.tar.gz
-              dlHash: f4aedfa8fbe371f77286ee97ec5c3c553842e7ae15b2952a8b8442dccba04bf0
-              dlSubdir:
-                RegexDir: "stack-.*"
-          Windows:
-            unknown_versioning:
-              dlUri: https://github.com/commercialhaskell/stack/releases/download/v2.5.1/stack-2.5.1-windows-x86_64.tar.gz
-              dlHash: 57150b422cfd42249f5e629d0eb678df6d95dabe486ced57e8298d300b940d41
-              dlSubdir:
-                RegexDir: "stack-.*"
-          Linux_Alpine:
-            unknown_versioning: *stack-251-64
-    2.7.1:
-      viTags:
-        - Recommended
-        - Latest
-      viChangeLog: https://github.com/commercialhaskell/stack/blob/master/ChangeLog.md#v271
-      viPostInstall: *stack-post
-      viArch:
-        A_64:
-          Linux_UnknownLinux:
-            unknown_versioning: &stack-64
-              dlUri: https://github.com/commercialhaskell/stack/releases/download/v2.7.1/stack-2.7.1-linux-x86_64.tar.gz
-              dlHash: 2bc47749ee4be5eccb52a2d4a6a00b0f3b28b92517742b40c675836d7db2777d
-              dlSubdir:
-                RegexDir: "stack-.*"
-          Darwin:
-            unknown_versioning:
-              dlUri: https://github.com/commercialhaskell/stack/releases/download/v2.7.1/stack-2.7.1-osx-x86_64.tar.gz
-              dlHash: 4248c6fbc87e8a2c06f39e867eb5ef28eae0d99470137cb415356c631c0dcbf2
-              dlSubdir:
-                RegexDir: "stack-.*"
-          Windows:
-            unknown_versioning:
-              dlUri: https://github.com/commercialhaskell/stack/releases/download/v2.7.1/stack-2.7.1-windows-x86_64.tar.gz
-              dlHash: 8452f5fc9235620a84863f2f68e5f681c72d0d181cde50482f178a966ee0ceb9
-              dlSubdir:
-                RegexDir: "stack-.*"
-          Linux_Alpine:
-            unknown_versioning: *stack-64
-
--- a/ghcup-0.0.5.yaml
+++ b/ghcup-0.0.5.yaml
@@ -1,7 +1,7 @@
 ---
 globalTools:
  ShimGen:
-    dlUri: https://downloads.haskell.org/~ghcup/tmp/gs.exe
+    dlUri: https://downloads.haskell.org/~ghcup/shimgen/gs.exe
    dlHash: 9ce8b7dad7ff4e5017dbd63d6f6f3d16412b889560cb6ccd3903dbcab0bf4f0d
 toolRequirements:
  GHC:
@@ -1387,6 +1387,7 @@ ghcupDownloads:
              dlHash: bb9c97826b1f4d7a8ef8bce0616b612f1ded10480ef10fcf7fb4e6d10a6681c8
    8.10.3:
      viTags:
+      - old
      - base-4.14.1.0
      viChangeLog: https://downloads.haskell.org/~ghc/8.10.3/docs/html/users_guide/8.10.3-notes.html
      viSourceDL:
@@ -1481,7 +1482,6 @@ ghcupDownloads:
              dlHash: b823b58cae36fbac0741680ca7605180fa4cf4c6ae439123d282184b94d32fd6
    8.10.4:
      viTags:
-      - Recommended
      - base-4.14.1.0
      viChangeLog: https://downloads.haskell.org/~ghc/8.10.4/docs/html/users_guide/8.10.4-notes.html
      viSourceDL:
@@ -1489,7 +1489,7 @@ ghcupDownloads:
        dlSubdir: ghc-8.10.4
        dlHash: 52af871b4e08550257d720c2944ac85727d0b948407cef1bebfe7508c224910e
      viPostRemove: *ghc-post-remove
-      viPreCompile: "If you have autoconf >= 2.70 you'll need this patch https://gitlab.haskell.org/ghc/ghc/-/snippets/2040 (see the --patchdir option)"
+      viPreCompile: &ghc-pre-compile "If you have autoconf >= 2.70 you'll need this patch https://gitlab.haskell.org/ghc/ghc/-/snippets/2040 (see the --patchdir option)"
      viArch:
        A_64:
          Linux_Debian:
@@ -1575,6 +1575,107 @@ ghcupDownloads:
              dlUri: https://downloads.haskell.org/~ghc/8.10.4/ghc-8.10.4-armv7-deb10-linux.tar.xz
              dlSubdir: ghc-8.10.4
              dlHash: 0d18ef83593272f6196a41cc3abdc48dfe5e14372db75d71ea19fe35320c4e81
+    8.10.5:
+      viTags:
+      - Recommended
+      - base-4.14.2.0
+      viChangeLog: https://downloads.haskell.org/~ghc/8.10.5/docs/html/users_guide/8.10.5-notes.html
+      viSourceDL:
+        dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-src.tar.xz
+        dlSubdir: ghc-8.10.5
+        dlHash: f10941f16e4fbd98580ab5241b9271bb0851304560c4d5ca127e3b0e20e3076f
+      viPostRemove: *ghc-post-remove
+      viPreCompile: *ghc-pre-compile
+      viArch:
+        A_64:
+          Linux_Debian:
+            '( >= 9 && < 10 )': &ghc-8105-64-deb9
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-deb9-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 15e71325c3bdfe3804be0f84c2fc5c913d811322d19b0f4d4cff20f29cdd804d
+            '( >= 10 && < 11 )': &ghc-8105-64-deb10
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-deb10-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: bc623c20ca4c5c18e952071ba14aa0cfc5c94d34219bffaa615f7b491f376787
+            unknown_versioning: *ghc-8105-64-deb9
+          Linux_Ubuntu:
+            unknown_versioning: &ghc-8105-64-fedora
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-fedora27-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 73528ebfb219b50aa9042ee51a0a2bd764828d605f058404989d0b645752d210
+            '( >= 16 && < 19 )': *ghc-8105-64-deb9
+          Linux_Mint:
+            unknown_versioning: *ghc-8105-64-deb10
+          Linux_Fedora:
+            '( >= 27 && < 28 )': *ghc-8105-64-fedora
+            unknown_versioning: *ghc-8105-64-fedora
+          Linux_CentOS:
+            '( >= 7 && < 8 )': &ghc-8105-64-centos
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-centos7-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 4cdb259ec74d1408dab45dab20dcedc21690f39921c2ea4546486fb3e81f4fbd
+            unknown_versioning: *ghc-8105-64-centos
+          Linux_RedHat:
+            unknown_versioning: *ghc-8105-64-centos
+          Linux_Alpine:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-alpine3.10-linux-integer-simple.tar.xz
+              dlSubdir: ghc-8.10.5-x86_64-unknown-linux
+              dlHash: f4d7cd9ed12a4b8592219c9a63a86db1a256a09fa9e6ed755a60afc57dc782e2
+          Linux_AmazonLinux:
+            unknown_versioning: *ghc-8105-64-centos
+          Linux_UnknownLinux:
+            unknown_versioning: *ghc-8105-64-fedora
+          Darwin:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-apple-darwin.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: ef0f47eff8962d58fa447123636cf8ef31c1e5b2d0ae90177d3388861ddf4a22
+          FreeBSD:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/ghc/8.10.5/ghc-8.10.5-x86_64-portbld-freebsd.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 11a0b490bfb2f57b5bc87c69c197542eafce1b4991cc22f625179a6c6e567834
+          Windows:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-x86_64-unknown-mingw32.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 4443d989df4f2680f681a4d8b8db310ce9582d21743984016b0eb0163b0c9998
+        A_32:
+          Linux_Debian:
+            '( >= 9 && < 10 )': &ghc-8105-32-deb9
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-i386-deb9-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 0ccb5b2c1222374874795c35410754dd650f649b774872abbea2a4ef21ac9c9d
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_Ubuntu:
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_Mint:
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_UnknownLinux:
+            unknown_versioning: *ghc-8105-32-deb9
+          Linux_Alpine:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/ghc/8.10.5/ghc-8.10.5-i386-alpine-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 0e91abe61607f9375d4e252ee9c261e4856df396f60641bb1b880ab8a3a83ea7
+        A_ARM64:
+          Linux_UnknownLinux:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-aarch64-deb10-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 9a085cd8a7f8e0ace21ac67dbf659a56fcf41564b48817ba42cd8a1aac7f0ddc
+          Darwin:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-aarch64-apple-darwin.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 03684e70ff03d041b9a4e0f84c177953a241ab8ec7a028c72fa21ac67e66cb09
+        A_ARM:
+          Linux_UnknownLinux:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghc/8.10.5/ghc-8.10.5-armv7-deb10-linux.tar.xz
+              dlSubdir: ghc-8.10.5
+              dlHash: 56170d1a8450e18b7eb9c23c94723da352815b27ec250bb23742a62f16dcab6c
    9.0.1:
      viTags:
      - Latest
@@ -1912,13 +2013,18 @@ ghcupDownloads:
            unknown_versioning:
              dlUri: https://downloads.haskell.org/~cabal/cabal-install-3.4.0.0/cabal-install-3.4.0.0-aarch64-ubuntu-18.04.tar.xz
              dlHash: 04d378347896dfdc3510b192b97489815cfa5d692f46e2758da0f789e682b8f0
+          Darwin:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal/3.4.0.0/cabal-install-3.4.0.0-aarch64-darwin-big-sur.tar.xz
+              dlHash: 46d8f96446a6bcdb81b3a9fbc14b137dc4f08436b46fe6446c5fba7bcb9b3d75
+
        A_ARM:
          Linux_UnknownLinux:
            unknown_versioning:
              dlUri: https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal/3.4.0.0/cabal-install-3.4.0.0-armv7-linux-bootstrapped.tar.xz
              dlHash: 16c0d1eaba24bed14f3e152970179a45d9f9bb5cc839b2c210ad06eb7d4826ed
  GHCup:
-    0.1.14.1:
+    0.1.15.1:
      viTags:
      - Recommended
      - Latest
@@ -1928,39 +2034,43 @@ ghcupDownloads:
        A_64:
          Linux_UnknownLinux:
            unknown_versioning: &ghcup-64
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/x86_64-linux-ghcup-0.1.14.1
-              dlHash: 59e31b2ede3ed20f79dce0f8ba0a68b6fb25e5f00ba2d7243f6a8af68d979ff5
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-linux-ghcup-0.1.15.1
+              dlHash: 871c9dc1bfbf7df6fe3b9b7250c20a3dae8a7aee171712a3e63689ab75bc9439
          Darwin:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/x86_64-apple-darwin-ghcup-0.1.14.1
-              dlHash: 3e1dd173b3e7b5d90dcdece423c3ddd3efb4c83e964967b0fb574c9b7b2c44e1
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-apple-darwin-ghcup-0.1.15.1
+              dlHash: 7cd67b554fc58c4ffb224b73e369c5dd27c5276c01f102f6423230b34cc635bc
          FreeBSD:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/x86_64-portbld-freebsd-ghcup-0.1.14.1
-              dlHash: 89a70980d77888dae8b9fd0f05e7a7920f421bc3bb5192da8e73fd4e7b4cb86f
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-portbld-freebsd-ghcup-0.1.15.1
+              dlHash: b4ad9c9f1a878560e8f770d985d53b8fb70582baf99e40e53ec9ee97dc47ae64
          Windows:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/tmp/x86_64-mingw64-ghcup-1.exe
-              dlHash: a61ae29e677db0f0a93505e0ab3b35b7ccc3ebec6a2a2cf9418cfd550ef82ec6
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/x86_64-mingw64-ghcup-0.1.15.1.exe
+              dlHash: 045bac4620fc9d1119ed4961aeba46b616ed572dd11b7d35b48caf58eea08d0f
          Linux_Alpine:
            unknown_versioning: *ghcup-64
        A_32:
          Linux_UnknownLinux:
            unknown_versioning: &ghcup-32
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/i386-linux-ghcup-0.1.14.1
-              dlHash: 610aac7c3be3ba3874c07b9cae5b2ca0da9a92bf381afc2597bd2dc9c70aae0c
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/i386-linux-ghcup-0.1.15.1
+              dlHash: 0c1dcbdd7cfa8accdfbe14c623924f3ca29a35d32a2ac3e61f0eb322855e2cb1
          Linux_Alpine:
            unknown_versioning: *ghcup-32
        A_ARM64:
          Linux_UnknownLinux:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/aarch64-linux-ghcup-0.1.14.1
-              dlHash: e9ae07b7d41ea03e6af9c1f3587f61287827c4e29478b6a5d46ea1ce5af4cee5
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/aarch64-linux-ghcup-0.1.15.1
+              dlHash: 7fa29d8e9a9fe3d1e3a63a1d16fc3550128edbdb9b5b5dff7974358c4dab192c
+          Darwin:
+            unknown_versioning:
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/aarch64-apple-darwin-ghcup-0.1.15.1
+              dlHash: 6a743cd50e8124ac2de8be77013d49dcf3b99ce7cc463ec86ed99a904a51dfd9
        A_ARM:
          Linux_UnknownLinux:
            unknown_versioning:
-              dlUri: https://downloads.haskell.org/~ghcup/0.1.14.1/armv7-linux-ghcup-0.1.14.1
-              dlHash: 646832030efbc0a848df24c08b5eb7507bd15d1c2eb95fea6d9d03890f3662be
+              dlUri: https://downloads.haskell.org/~ghcup/0.1.15.1/armv7-linux-ghcup-0.1.15.1
+              dlHash: 77ee5d9828c2ba771127274e301e81412b9f29af2d65dd85dada4786d9438c2c
  HLS:
    1.1.0:
      viTags:
@@ -1986,9 +2096,12 @@ ghcupDownloads:
            unknown_versioning: *hls-64
  Stack:
    2.5.1:
-      viTags: []
+      viTags:
+        - old
      viChangeLog: https://github.com/commercialhaskell/stack/blob/master/ChangeLog.md#v251
-      viPostInstall: &stack-post "Stack manages GHC versions internally by default. In order to make it use ghcup installed GHC versions have a look at the options 'system-ghc', 'compiler-check' and 'compiler': https://docs.haskellstack.org/en/stable/yaml_configuration/#system-ghc"
+      viPostInstall: &stack-post |
+        Stack manages GHC versions internally by default. In order to make it use ghcup installed GHC versions have a look at the options 'system-ghc', 'compiler-check' and 'compiler': https://docs.haskellstack.org/en/stable/yaml_configuration/#system-ghc
+        Additionally, you should upgrade stack only through ghcup.
      viArch:
        A_64:
          Linux_UnknownLinux:
--- a/ghcup.cabal
+++ b/ghcup.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.0
 name:            ghcup
-version:         0.1.15
+version:         0.1.15.1
 license:         LGPL-3.0-only
 license-file:    LICENSE
 copyright:       Julian Ospald 2020
@@ -19,6 +19,7 @@ extra-doc-files:
  CHANGELOG.md
  config.yaml
  ghcup-0.0.4.yaml
+  ghcup-0.0.5.yaml
  HACKING.md
  README.md
  RELEASING.md
@@ -114,7 +115,7 @@ library
    , generics-sop          ^>=0.5
    , haskus-utils-types    ^>=1.5
    , haskus-utils-variant  >=3.0        && <3.2
-    , lzma-static           ^>=5.2.5.2
+    , lzma-static           ^>=5.2.5.3
    , megaparsec            >=8.0.0      && <9.1
    , monad-logger          ^>=0.3.31
    , mtl                   ^>=2.2
@@ -144,7 +145,7 @@ library
    , versions              ^>=4.0.1
    , word8                 ^>=0.1.3
    , yaml                  ^>=0.11.4.0
-    , zip                   ^>=1.7.0
+    , zip                   ^>=1.7.1
    , zlib                  ^>=0.6.2.2

  if (flag(internal-downloader) && !os(windows))
@@ -156,7 +157,7 @@ library
      , io-streams             >=1.5.2.1
      , terminal-progress-bar  >=0.4.1

-  if (flag(tar) || os(windows))
+  if flag(tar)
    cpp-options:   -DTAR
    build-depends: tar

@@ -242,7 +243,7 @@ executable ghcup
  if os(windows)
    cpp-options: -DIS_WINDOWS

-  if (flag(tar) || os(windows))
+  if flag(tar)
    cpp-options: -DTAR

  else
@@ -296,7 +297,7 @@ executable ghcup-gen
    , versions              ^>=4.0.1
    , yaml                  ^>=0.11.4.0

-  if (flag(tar) || os(windows))
+  if flag(tar)
    cpp-options:   -DTAR
    build-depends: tar

--- a/lib/GHCup.hs
+++ b/lib/GHCup.hs
@@ -84,6 +84,9 @@ import qualified Data.ByteString.Lazy          as BL
 import qualified Data.Map.Strict               as Map
 import qualified Data.Text                     as T
 import qualified Data.Text.Encoding            as E
+#if defined(IS_WINDOWS)
+import qualified System.Win32.File             as Win32
+#endif
 import qualified Text.Megaparsec               as MP
 import GHCup.Utils.MegaParsec
 import Control.Concurrent (threadDelay)
@@ -658,7 +661,6 @@ setGHC ver sghc = do

  -- symlink destination
  AppState { dirs = Dirs {..} } <- lift ask
-  liftIO $ createDirRecursive' binDir

  -- first delete the old symlinks (this fixes compatibility issues
  -- with old ghcup)
@@ -741,7 +743,6 @@ setCabal ver = do

  -- symlink destination
  AppState {dirs = Dirs {..}} <- lift ask
-  liftIO $ createDirRecursive' binDir

  whenM (liftIO $ not <$> doesFileExist (binDir </> targetFile))
    $ throwE
@@ -772,7 +773,6 @@ setHLS :: ( MonadCatch m
       -> Excepts '[NotInstalled] m ()
 setHLS ver = do
  AppState { dirs = Dirs {..} } <- lift ask
-  liftIO $ createDirRecursive' binDir

  -- Delete old symlinks, since these might have different ghc versions than the
  -- selected version, so we could end up with stray or incorrect symlinks.
@@ -815,7 +815,6 @@ setStack ver = do

  -- symlink destination
  AppState {dirs = Dirs {..}} <- lift ask
-  liftIO $ createDirRecursive' binDir

  whenM (liftIO $ not <$> doesFileExist (binDir </> targetFile))
    $ throwE
@@ -878,7 +877,7 @@ listVersions :: ( MonadCatch m
 listVersions lt' criteria = do
  -- some annoying work to avoid too much repeated IO
  cSet <- cabalSet
-  cabals <- getInstalledCabals' cSet
+  cabals <- getInstalledCabals
  hlsSet' <- hlsSet
  hlses <- getInstalledHLSs
  sSet <- stackSet
@@ -1324,6 +1323,7 @@ compileGHC :: ( MonadMask m
              , MonadFail m
              )
           => Either GHCTargetVersion GitBranch          -- ^ version to install
+           -> Maybe Version            -- ^ overwrite version
           -> Either Version FilePath  -- ^ version to bootstrap with
           -> Maybe Int                  -- ^ jobs
           -> Maybe FilePath           -- ^ build config
@@ -1347,7 +1347,7 @@ compileGHC :: ( MonadMask m
                 ]
                m
                GHCTargetVersion
-compileGHC targetGhc bstrap jobs mbuildConfig patchdir aargs
+compileGHC targetGhc ov bstrap jobs mbuildConfig patchdir aargs
  = do
    AppState { pfreq = PlatformRequest {..}
             , ghcupInfo = GHCupInfo { _ghcupDownloads = dls }
@@ -1399,7 +1399,7 @@ compileGHC targetGhc bstrap jobs mbuildConfig patchdir aargs

          lEM $ git [ "checkout", "FETCH_HEAD" ]
          lEM $ git [ "submodule", "update", "--init", "--depth", "1" ]
-          lEM $ execLogged "sh" ["./boot"] (Just tmpUnpack) "ghc-bootstrap" Nothing
+          lEM $ execLogged "python3" ["./boot"] (Just tmpUnpack) "ghc-bootstrap" Nothing
          lEM $ execLogged "sh" ["./configure"] (Just tmpUnpack) "ghc-bootstrap" Nothing
          CapturedProcess {..} <- lift $ makeOut
            ["show!", "--quiet", "VALUE=ProjectVersion" ] (Just tmpUnpack)
@@ -1411,8 +1411,11 @@ compileGHC targetGhc bstrap jobs mbuildConfig patchdir aargs
        lift $ $(logInfo) [i|Git version #{ref} corresponds to GHC version #{prettyVer tver}|]

        pure (tmpUnpack, tmpUnpack, GHCTargetVersion Nothing tver)
+    -- the version that's installed may differ from the
+    -- compiled version, so the user can overwrite it
+    let installVer = maybe tver (\ov' -> tver { _tvVersion = ov' }) ov

-    alreadyInstalled <- lift $ ghcInstalled tver
+    alreadyInstalled <- lift $ ghcInstalled installVer
    alreadySet <- fmap (== Just tver) $ lift $ ghcSet (_tvTarget tver)
    when alreadyInstalled $ do
      lift $ $(logWarn) [i|GHC #{prettyShow tver} already installed. Will overwrite existing version.|]
@@ -1420,7 +1423,7 @@ compileGHC targetGhc bstrap jobs mbuildConfig patchdir aargs
        "...waiting for 10 seconds before continuing, you can still abort..."
      liftIO $ threadDelay 10000000 -- give the user a sec to intervene

-    ghcdir         <- lift $ ghcupGHCDir tver
+    ghcdir         <- lift $ ghcupGHCDir installVer

    bghc <- case bstrap of
      Right g    -> pure $ Right g
@@ -1633,14 +1636,27 @@ upgradeGHCup mtarget force = do
  let fn = "ghcup" <> exeExt
  p <- liftE $ download settings dli tmp (Just fn)
  let destDir = takeDirectory destFile
-      destFile = fromMaybe (binDir </> fn) mtarget
+      destFile = fromMaybe (binDir </> fn <> exeExt) mtarget
  lift $ $(logDebug) [i|mkdir -p #{destDir}|]
  liftIO $ createDirRecursive' destDir
+#if defined(IS_WINDOWS)
+  let tempGhcup = cacheDir </> "ghcup.old"
+  liftIO $ hideError NoSuchThing $ rmFile tempGhcup
+
+  lift $ $(logDebug) [i|mv #{destFile} #{tempGhcup}|]
+  -- NoSuchThing may be raised when we're updating ghcup from
+  -- a non-standard location
+  liftIO $ hideError NoSuchThing $ Win32.moveFileEx destFile (Just tempGhcup) 0
+  lift $ $(logDebug) [i|cp #{p} #{destFile}|]
+  handleIO (throwE . CopyError . show) $ liftIO $ copyFile p
+                                                           destFile
+#else
  lift $ $(logDebug) [i|rm -f #{destFile}|]
  liftIO $ hideError NoSuchThing $ rmFile destFile
  lift $ $(logDebug) [i|cp #{p} #{destFile}|]
  handleIO (throwE . CopyError . show) $ liftIO $ copyFile p
                                                           destFile
+#endif
  lift $ chmod_755 destFile

  liftIO (isInPath destFile) >>= \b -> unless b $
--- a/lib/GHCup/Download.hs
+++ b/lib/GHCup/Download.hs
@@ -227,7 +227,6 @@ getBase dirs@Dirs{..} Settings{ downloader }  =
          else -- access in less than 5 minutes, re-use file
               liftIO $ L.readFile json_file
      else do
-        liftIO $ createDirRecursive' cacheDir
        getModTime >>= \case
          Just modTime -> dlWithMod modTime json_file
          Nothing -> do
--- a/lib/GHCup/Platform.hs
+++ b/lib/GHCup/Platform.hs
@@ -44,6 +44,7 @@ import           Prelude                 hiding ( abs
 import           System.Info
 import           System.Directory
 import           System.OsRelease
+import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 import           Text.Regex.Posix

 import qualified Data.Text                     as T
@@ -97,7 +98,6 @@ getPlatform = do
        either (const Nothing) Just
          . versioning
          -- TODO: maybe do this somewhere else
-          . getMajorVersion
          . decUTF8Safe'
        <$> getDarwinVersion
      pure $ PlatformResult { _platform = Darwin, _distroVersion = ver }
@@ -108,10 +108,9 @@ getPlatform = do
      pure $ PlatformResult { _platform = FreeBSD, _distroVersion = ver }
    "mingw32" -> pure PlatformResult { _platform = Windows, _distroVersion = Nothing }
    what -> throwE $ NoCompatiblePlatform what
-  lift $ $(logDebug) [i|Identified Platform as: #{pfr}|]
+  lift $ $(logDebug) [i|Identified Platform as: #{prettyShow pfr}|]
  pure pfr
 where
-  getMajorVersion = T.intercalate "." . take 2 . T.split (== '.')
  getFreeBSDVersion = lift $ fmap _stdOut $ executeOut "freebsd-version" [] Nothing
  getDarwinVersion = lift $ fmap _stdOut $ executeOut "sw_vers"
                                                        ["-productVersion"]
--- a/lib/GHCup/Utils.hs
+++ b/lib/GHCup/Utils.hs
@@ -87,7 +87,6 @@ import qualified Codec.Archive.Tar             as Tar
 import qualified Codec.Compression.BZip        as BZip
 import qualified Codec.Compression.GZip        as GZip
 import qualified Codec.Compression.Lzma        as Lzma
-import qualified Data.ByteString               as B
 import qualified Data.ByteString.Lazy          as BL
 import qualified Data.Map.Strict               as Map
 import qualified Data.Text                     as T
@@ -253,14 +252,6 @@ getInstalledGHCs = do
 getInstalledCabals :: (MonadLogger m, MonadReader AppState m, MonadIO m, MonadCatch m)
                   => m [Either FilePath Version]
 getInstalledCabals = do
-  cs <- cabalSet -- for legacy cabal
-  getInstalledCabals' cs
-
-
-getInstalledCabals' :: (MonadLogger m, MonadReader AppState m, MonadIO m, MonadCatch m)
-                   => Maybe Version
-                   -> m [Either FilePath Version]
-getInstalledCabals' cs = do
  AppState {dirs = Dirs {..}} <- ask
  bins   <- liftIO $ handleIO (\_ -> pure []) $ findFiles
    binDir
@@ -269,7 +260,7 @@ getInstalledCabals' cs = do
    Just (Right r) -> pure $ Right r
    Just (Left  _) -> pure $ Left f
    Nothing        -> pure $ Left f
-  pure $ maybe vs (\x -> nub $ Right x:vs) cs
+  pure $ nub vs


 -- | Whether the given cabal version is installed.
@@ -284,32 +275,21 @@ cabalSet :: (MonadLogger m, MonadReader AppState m, MonadIO m, MonadThrow m, Mon
 cabalSet = do
  AppState {dirs = Dirs {..}} <- ask
  let cabalbin = binDir </> "cabal" <> exeExt
-  b        <- handleIO (\_ -> pure False) $ liftIO $ pathIsLink cabalbin
-  if
-    | b -> do
-      handleIO' NoSuchThing (\_ -> pure Nothing) $ do
-        broken <- liftIO $ isBrokenSymlink cabalbin
-        if broken
-          then pure Nothing
-          else do
-            link <- liftIO $ getLinkTarget cabalbin
-            case linkVersion link of
-              Right v -> pure $ Just v
-              Left err -> do
-                $(logWarn) [i|Failed to parse cabal symlink target with: "#{err}". The symlink #{cabalbin} needs to point to valid cabal binary, such as 'cabal-3.4.0.0'.|]
-                pure Nothing
-    | otherwise -> do -- legacy behavior
-      mc <- handleIO (\_ -> pure Nothing) $ fmap Just $ executeOut
-        cabalbin
-        ["--numeric-version"]
-        Nothing
-      fmap join $ forM mc $ \c -> if
-        | not (BL.null (_stdOut c)), _exitCode c == ExitSuccess -> do
-          let reportedVer = fst . B.spanEnd isNewLine . BL.toStrict . _stdOut $ c
-          case version $ decUTF8Safe reportedVer of
-            Left  e -> throwM e
-            Right r -> pure $ Just r
-        | otherwise -> pure Nothing
+
+  handleIO' NoSuchThing (\_ -> pure Nothing) $ do
+    broken <- liftIO $ isBrokenSymlink cabalbin
+    if broken
+      then pure Nothing
+      else do
+        link <- liftIO
+          $ handleIO' InvalidArgument
+            (\e -> pure $ Left (toException e))
+          $ fmap Right $ getLinkTarget cabalbin
+        case linkVersion =<< link of
+          Right v -> pure $ Just v
+          Left err -> do
+            $(logWarn) [i|Failed to parse cabal symlink target with: "#{err}". The symlink #{cabalbin} needs to point to valid cabal binary, such as 'cabal-3.4.0.0'.|]
+            pure Nothing
 where
  -- We try to be extra permissive with link destination parsing,
  -- because of:
@@ -375,18 +355,25 @@ getInstalledStacks = do

 -- Return the currently set stack version, if any.
 -- TODO: there's a lot of code duplication here :>
-stackSet :: (MonadReader AppState m, MonadIO m, MonadThrow m, MonadCatch m) => m (Maybe Version)
+stackSet :: (MonadReader AppState m, MonadIO m, MonadThrow m, MonadCatch m, MonadLogger m) => m (Maybe Version)
 stackSet = do
  AppState {dirs = Dirs {..}} <- ask
  let stackBin = binDir </> "stack" <> exeExt

-  liftIO $ handleIO' NoSuchThing (\_ -> pure Nothing) $ do
-    broken <- isBrokenSymlink stackBin
+  handleIO' NoSuchThing (\_ -> pure Nothing) $ do
+    broken <- liftIO $ isBrokenSymlink stackBin
    if broken
      then pure Nothing
      else do
-        link <- liftIO $ getLinkTarget stackBin
-        Just <$> linkVersion link
+        link <- liftIO
+          $ handleIO' InvalidArgument
+            (\e -> pure $ Left (toException e))
+          $ fmap Right $ getLinkTarget stackBin
+        case linkVersion =<< link of
+          Right v -> pure $ Just v
+          Left err -> do
+            $(logWarn) [i|Failed to parse stack symlink target with: "#{err}". The symlink #{stackBin} needs to point to valid stack binary, such as 'stack-2.7.1'.|]
+            pure Nothing
 where
  linkVersion :: MonadThrow m => FilePath -> m Version
  linkVersion = throwEither . MP.parse parser "" . T.pack . dropSuffix exeExt
@@ -1088,3 +1075,21 @@ ensureGlobalTools = do
 #else
  pure ()
 #endif
+
+
+-- | Ensure ghcup directory structure exists.
+ensureDirectories :: Dirs -> IO ()
+ensureDirectories dirs = do
+  let Dirs
+        { baseDir
+        , binDir
+        , cacheDir
+        , logsDir
+        , confDir
+        } = dirs
+  createDirRecursive' baseDir
+  createDirRecursive' binDir
+  createDirRecursive' cacheDir
+  createDirRecursive' logsDir
+  createDirRecursive' confDir
+  pure ()
--- a/lib/GHCup/Utils/Dirs.hs
+++ b/lib/GHCup/Utils/Dirs.hs
@@ -47,14 +47,12 @@ import           Data.Maybe
 import           Data.String.Interpolate
 import           GHC.IO.Exception               ( IOErrorType(NoSuchThing) )
 import           Haskus.Utils.Variant.Excepts
-#if !defined(IS_WINDOWS)
 import           Optics
+#if !defined(IS_WINDOWS)
 import           System.Directory                                                
 #endif
 import           System.DiskSpace                                                
-#if !defined(IS_WINDOWS)
 import           System.Environment
-#endif
 import           System.FilePath
 import           System.IO.Temp

@@ -78,7 +76,8 @@ import Control.Concurrent (threadDelay)
 ghcupBaseDir :: IO FilePath
 ghcupBaseDir = do
 #if defined(IS_WINDOWS)
-  pure ("C:\\" </> "ghcup")
+  bdir <- fromMaybe "C:\\" <$> lookupEnv "GHCUP_INSTALL_BASE_PREFIX"
+  pure (bdir </> "ghcup")
 #else
  xdg <- useXDG
  if xdg
@@ -104,7 +103,7 @@ ghcupBaseDir = do
 ghcupConfigDir :: IO FilePath
 ghcupConfigDir = do
 #if defined(IS_WINDOWS)
-  pure ("C:\\" </> "ghcup")
+  ghcupBaseDir
 #else
  xdg <- useXDG
  if xdg
@@ -129,7 +128,7 @@ ghcupConfigDir = do
 ghcupBinDir :: IO FilePath
 ghcupBinDir = do
 #if defined(IS_WINDOWS)
-  pure ("C:\\" </> "ghcup" </> "bin")
+  ghcupBaseDir <&> (</> "bin")
 #else
  xdg <- useXDG
  if xdg
@@ -150,7 +149,7 @@ ghcupBinDir = do
 ghcupCacheDir :: IO FilePath
 ghcupCacheDir = do
 #if defined(IS_WINDOWS)
-  pure ("C:\\" </> "ghcup" </> "cache")
+  ghcupBaseDir <&> (</> "cache")
 #else
  xdg <- useXDG
  if xdg
@@ -172,7 +171,7 @@ ghcupCacheDir = do
 ghcupLogsDir :: IO FilePath
 ghcupLogsDir = do
 #if defined(IS_WINDOWS)
-  pure ("C:\\" </> "ghcup" </> "logs")
+  ghcupBaseDir <&> (</> "logs")
 #else
  xdg <- useXDG
  if xdg
--- a/lib/GHCup/Utils/File/Windows.hs
+++ b/lib/GHCup/Utils/File/Windows.hs
@@ -214,10 +214,10 @@ createProcessWithMingwPath :: MonadIO m
                          => CreateProcess
                          -> m CreateProcess
 createProcessWithMingwPath cp = do
-  baseDir <- liftIO ghcupBaseDir
+  msys2Dir <- liftIO ghcupMsys2Dir
  cEnv <- Map.fromList <$> maybe (liftIO getEnvironment) pure (env cp)
-  let mingWPaths = [baseDir </> "msys64" </> "usr" </> "bin"
-                   ,baseDir </> "msys64" </> "mingw64" </> "bin"]
+  let mingWPaths = [msys2Dir </> "usr" </> "bin"
+                   ,msys2Dir </> "mingw64" </> "bin"]
      paths = ["PATH", "Path"]
      curPaths = (\x -> maybe [] splitSearchPath (Map.lookup x cEnv)) =<< paths
      newPath = intercalate [searchPathSeparator] (mingWPaths ++ curPaths)
@@ -226,6 +226,13 @@ createProcessWithMingwPath cp = do
  liftIO $ setEnv "Path" newPath
  pure $ cp { env = Just $ Map.toList envWithNewPath }

+ghcupMsys2Dir :: IO FilePath
+ghcupMsys2Dir =
+  lookupEnv "GHCUP_MSYS2" >>= \case
+    Just fp -> pure fp
+    Nothing -> do
+      baseDir <- liftIO ghcupBaseDir
+      pure (baseDir </> "msys64")

 -- | Checks whether the binary is a broken link.
 isBrokenSymlink :: FilePath -> IO Bool
--- a/lib/GHCup/Utils/Logger.hs
+++ b/lib/GHCup/Utils/Logger.hs
@@ -22,7 +22,6 @@ import           Control.Monad.IO.Class
 import           Control.Monad.Logger
 import           Prelude                 hiding ( appendFile )
 import           System.Console.Pretty
-import           System.Directory        hiding ( findFiles )
 import           System.FilePath
 import           System.IO.Error
 import           Text.Regex.Posix
@@ -70,7 +69,6 @@ initGHCupFileLogging :: (MonadIO m) => FilePath -> m FilePath
 initGHCupFileLogging logsDir = do
  let logfile = logsDir </> "ghcup.log"
  liftIO $ do
-    createDirectoryIfMissing True logsDir
    logFiles <- findFiles
      logsDir
      (makeRegexOpts compExtended
--- a/stack.yaml
+++ b/stack.yaml
@@ -27,8 +27,8 @@ extra-deps:
  - hspec-core-2.7.10@sha256:2aba6ea126442b29e8183ab27f1c811706b19b1d83b02f193a896f6fc1589d13,4621
  - hspec-discover-2.7.10@sha256:d08bf5dd785629f589571477d9beb7cd91529471bd89f39517c1cb4b9b38160f,2184
  - hspec-golden-aeson-0.9.0.0@sha256:aa17274114026661ba4dfc9c60c230673c8f408bd86482fd611d2d5cb6aff996,2179
-  - lzma-static-5.2.5.2@sha256:ac38dcad9ab423342a72ba48415bd75f62234e9c9e11831495b75603b5a060f6,7184
  - libarchive-3.0.2.1@sha256:40ebf2a278e585802427bc58826867208bb33822f63d56107a1fcc3ca04d691d,10990
+  - lzma-static-5.2.5.3@sha256:2758ee58c35992fcf7db78e98684c357a16a82fa2a4e7c352a6c210c08c555d8,7308
  - os-release-1.0.1@sha256:1281c62081f438fc3f0874d3bae6a4887d5964ac25261ba06e29d368ab173467,2716
  - primitive-0.7.0.1@sha256:a381571c36edc7dca28b77fe8159b43c14c640087ec5946adacf949feec64231,3433
  - regex-posix-clib-2.7
@@ -37,6 +37,7 @@ extra-deps:
  - streamly-posix-0.1.0.1@sha256:5d89b806281035d34020387ed99dde1ddab282c7ed66df3b7cd010b38fd3517b,2138
  - strict-base-0.4.0.0@sha256:2ff4e43cb95eedf2995558d7fc34d19362846413dd39e6aa6a5b3ea8228fef9f,1248
  - xor-0.0.1.0@sha256:f8362b4a68562b9afbcd727ff64c1a303970df3a032e0033d2f4c094c3501df3,2243
+  - zip-1.7.1@sha256:0ce03d0fbffba47c1ab6fbb9166f8ba5373d828d78587df21b7e9d7bb150f929,3918

 flags:
  http-io-streams:
--- a/www/ghcup.js
+++ b/www/ghcup.js
@@ -158,8 +158,8 @@ function copyToClipboard() {
  document.body.removeChild(el);
 }

-function copyToClipboardSilicon() {
-  const text = document.getElementById("ghcup-command-silicon").innerText;
+function copyToClipboardPowershell() {
+  const text = document.getElementById("ghcup-command-powershell").innerText;
  const el = document.createElement('textarea');
  el.value = text;
  document.body.appendChild(el);
--- a/www/index.html
+++ b/www/index.html
@@ -14,13 +14,12 @@

  <body id="idx">

-    <script id='html-content' type="text/html">
      <a id="platform-button" style="display: none;" href="#">
        click or press "n" to cycle platforms
      </a>

      <p id="pitch">
-        <em>ghcup</em> is the main installer for<br/>
+        <em>ghcup</em> is an installer for<br/>
        the general purpose language <a href="https://www.haskell.org/">Haskell</a>
      </p>

@@ -32,10 +31,7 @@

      <div id="platform-instructions-mac" class="instructions" style="display: none;">
        <p>Run the following in your terminal (as a user other than root), then follow the onscreen instructions.</p>
-		<p>On Intel:</p>
 		<div class="command-button"><pre><span class='ghcup-command' id="ghcup-command-normal">curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
-        <p>On Apple Silicon:</p>
-		<div class="command-button"><pre><span class='ghcup-command' id="ghcup-command-silicon">curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | arch -x86_64 /bin/bash</span></pre><button class="tooltip" onclick="copyToClipboardSilicon()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
        <p class="other-help">If you don't like curl | sh, see <a href="https://gitlab.haskell.org/haskell/ghcup-hs#manual-install">other installation methods</a>.<br/>You appear to be running macOS. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
      </div>

@@ -47,24 +43,24 @@

      <div id="platform-instructions-win32" class="instructions">
        <p>
-          To install Haskell, follow the instructions on
-          <a class="windows-download" href="https://www.haskell.org/platform/#windows">Haskell Platform</a>
-		<p>If you're a Windows Subsystem for Linux user run the following in your terminal, then follow the onscreen instructions to install Haskell.
+            To install Haskell,<br/>run the following in a powershell session (as a non-admin user).
+			<div class="command-button"><pre><span class='ghcup-command' id="ghcup-command-powershell">Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
+		<p>If you're a Windows Subsystem 2 for Linux user run the following in your terminal, then follow the onscreen instructions to install Haskell.
 		</p>
 		<div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
        </p>
-        <p class="other-help">You appear to be running Windows 32-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
+		<p class="other-help">WSL1 does not work with ghcup, follow  <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">the instructions here</a> to upgrade to WSL2 if needed.</br>You appear to be running Windows 32-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
      </div>

      <div id="platform-instructions-win64" class="instructions" style="display: none;">
        <p>
-          To install Haskell, follow the instructions on
-          <a class="windows-download" href="https://www.haskell.org/platform/#windows">Haskell Platform</a>
+            To install Haskell,<br/>run the following in a powershell session (as a non-admin user).
+			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
        </p>
-		<p>If you're a Windows Subsystem for Linux user run the following in your terminal, then follow the onscreen instructions to install Haskell.
+		<p>If you're a Windows Subsystem 2 for Linux user run the following in your terminal, then follow the onscreen instructions to install Haskell.
 		</p>
 		<div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
-        <p class="other-help">You appear to be running Windows 64-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
+		<p class="other-help">WSL1 does not work with ghcup, follow  <a href="https://docs.microsoft.com/en-us/windows/wsl/install-win10">the instructions here</a> to upgrade to WSL2 if needed.</br>You appear to be running Windows 64-bit. If not, <a class="default-platform-button" href="#">display all supported installers</a>.</p>
      </div>

      <div id="platform-instructions-unknown" class="instructions" style="display: none;">
@@ -86,7 +82,7 @@

        <!-- duplicate the default cross-platform instructions -->
        <div>
-          <p>If you are running Linux, macOS, FreeBSD or Windows Subsystem for Linux, run the following in your terminal (as a user other than root), then follow the onscreen instructions.</p>
+          <p>If you are running Linux, macOS, FreeBSD or Windows Subsystem 2 for Linux, run the following in your terminal (as a user other than root), then follow the onscreen instructions.</p>
 		  <div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
          <p class="other-help">If you don't like curl | sh, see <a href="https://gitlab.haskell.org/haskell/ghcup-hs#manual-install">other installation methods</a>.</p>
        </div>
@@ -95,8 +91,8 @@

        <div>
          <p>
-            If you are running Windows,<br/>follow the instructions on
-            <a class="windows-download" href="https://www.haskell.org/platform/#windows">Haskell Platform</a>
+            If you are running Windows,<br/>run the following in a powershell session (as a non-admin user).
+			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
          </p>
        </div>

@@ -104,11 +100,9 @@

      <div id="platform-instructions-default" class="instructions">
        <div>
-          <p>To install Haskell, if you are running Linux, macOS (on Intel), FreeBSD or Windows Subsystem for Linux, run the following
+          <p>To install Haskell, if you are running Linux, macOS, FreeBSD or Windows Subsystem 2 for Linux, run the following
          in your terminal (as a user other than root), then follow the onscreen instructions.</p>
 		  <div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre><button class="tooltip" onclick="copyToClipboard()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
-          <p>For macOS on Apple Silicon, run this instead:</p>
-          <div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | arch -x86_64 /bin/bash</span></pre><button class="tooltip" onclick="copyToClipboardSilicon()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
          <p class="other-help">If you don't like curl | sh, see <a href="https://gitlab.haskell.org/haskell/ghcup-hs#manual-install">other installation methods</a>.</p>
        </div>

@@ -116,8 +110,8 @@

        <div>
          <p>
-            If you are running Windows,<br/>follow the instructions on
-            <a class="windows-download" href="https://www.haskell.org/platform/#windows">Haskell Platform</a>
+            If you are running Windows,<br/>run the following in a powershell session (as a non-admin user).
+			<div class="command-button"><pre><span class='ghcup-command'>Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; Invoke-WebRequest -UseBasicParsing https://www.haskell.org/ghcup/sh/bootstrap-haskell.ps1 | Invoke-Expression</span></span></pre><button class="tooltip" onclick="copyToClipboardPowershell()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
          </p>
        </div>

@@ -137,54 +131,7 @@
        &nbsp;&middot;&nbsp;
        <a href="https://github.com/rust-lang/rustup.rs/tree/master/www">web design from rustup</a>
      </p>
-    </script>
-    <script>
-      document.write(document.getElementById("html-content").innerHTML);
-    </script>
    <script type="text/javascript" src="ghcup.js"></script>

-    <noscript>
-      <p id="pitch">
-        <em>ghcup</em> is the main installer for<br/>
-        the general purpose language <a href="https://www.haskell.org/">Haskell</a>
-      </p>
-
-      <div id="platform-instructions-default" class="instructions">
-        <div>
-          <p>To install Haskell, if you are running Linux, macOS (on Intel), FreeBSD or Windows Subsystem for Linux, run the following
-          in your terminal (as a user other than root), then follow the onscreen instructions.</p>
-		  <pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh</span></pre>
-          <p>For macOS on Apple Silicon, run this instead:</p>
-          <div class="command-button"><pre><span class='ghcup-command'>curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | arch -x86_64 /bin/bash</span></pre><button class="tooltip" onclick="copyToClipboardSilicon()"><img src="copy.svg" alt="" /><span class="tooltiptext">Copy to clipboard</span></button></div>
-          <p class="other-help">If you don't like curl | sh, see <a href="https://gitlab.haskell.org/haskell/ghcup-hs#manual-install">other installation methods</a>.</p>
-        </div>
-
-        <hr/>
-
-        <div>
-          <p>
-            If you are running Windows,<br/>follow the instructions on
-            <a class="windows-download" href="https://www.haskell.org/platform/#windows">Haskell Platform</a>
-          </p>
-        </div>
-
-      </div>
-
-      <p>
-        Need help? Ask on <a href="https://kiwiirc.com/nextclient/irc.libera.chat/#haskell-ghcup">#haskell-ghcup</a>, <a href="https://kiwiirc.com/nextclient/irc.libera.chat/#haskell">#haskell</a> or <a href="https://gitlab.haskell.org/haskell/ghcup-hs/issues">report a bug</a>.
-      </p>
-
-      <p id="about">
-        <img src="haskell-logo.svg" alt="" />
-        ghcup is a haskell.org hosted project.
-        <br/>
-        <a href="https://www.haskell.org/downloads/">other installation options</a>
-        &nbsp;&middot;&nbsp;
-        <a href="https://gitlab.haskell.org/haskell/ghcup-hs">about ghcup</a>
-        &nbsp;&middot;&nbsp;
-        <a href="https://github.com/rust-lang/rustup.rs/tree/master/www">web design from rustup</a>
-      </p>
-
-    </noscript>
  </body>
 </html>
Author	SHA1	Message	Date
Julian Ospald	dfb6c09133	Enable libarchive wrt #147	2021-06-13 21:29:00 +02:00
Julian Ospald	9636276c17	Fix nancy	2021-06-13 19:29:25 +02:00
Julian Ospald	41783ff027	Fix ghcup upgrade if binary is in non-standard location	2021-06-13 15:08:31 +02:00
Julian Ospald	08b0ecd057	Allow to skip update checks	2021-06-13 15:05:39 +02:00
Julian Ospald	7e31798446	Fix ghcup_version.sh	2021-06-13 14:43:00 +02:00
Julian Ospald	534afa6e8d	Update windows CI	2021-06-13 14:15:48 +02:00
Julian Ospald	b56c44a210	Ensure directories	2021-06-13 13:41:06 +02:00
Julian Ospald	ef0c94fddd	Fix windows upgrade for good	2021-06-13 10:15:34 +02:00
Julian Ospald	f14c281841	Fix for real	2021-06-13 08:36:20 +02:00
Julian Ospald	b40cefee35	Fix 'ghcup upgrade' on windows	2021-06-13 07:51:54 +02:00
Julian Ospald	ff32ccfb50	Add warning about XDG dirs	2021-06-12 22:35:03 +02:00
Julian Ospald	581108ab65	Fix compliation from git	2021-06-12 22:27:56 +02:00
Julian Ospald	54e8e3efb0	Gracefully handle stack binary not installed by ghcup	2021-06-12 22:27:31 +02:00
Julian Ospald	4dcc63606e	Remove legacy handling of cabal binary	2021-06-12 22:26:50 +02:00
Julian Ospald	a396b6044d	Allow more failures	2021-06-12 16:08:30 +02:00
Julian Ospald	94e5d2e19f	Don't error on stack/hls failed install	2021-06-12 16:05:35 +02:00
Julian Ospald	a0976eee70	Mark stack 2.5.1 as old	2021-06-12 16:02:37 +02:00
Julian Ospald	61494d8c4b	Improve stack post install message	2021-06-12 16:01:15 +02:00
Julian Ospald	2b34c2dd69	Fix copy button under windows	2021-06-12 12:18:13 +02:00
Julian Ospald	afc30b87dd	Merge remote-tracking branch 'origin/merge-requests/97'	2021-06-12 02:42:06 +02:00
amesgen	ed0a63eb0c	fix ghcup-0.0.4.yaml Windows is an unknown platform in < 0.1.15	2021-06-12 02:11:20 +02:00
Julian Ospald	9ba590dd90	Update www	2021-06-12 01:23:49 +02:00
Julian Ospald	d4bffd2c4a	Merge branch 'prepare-0.1.15.1'	2021-06-12 00:20:03 +02:00
Julian Ospald	650f0a3e4e	Fix up 0.1.15.1	2021-06-11 23:57:16 +02:00
Julian Ospald	fd6ccf8f0a	Add FreeBSD to 0.1.14.1	2021-06-11 22:51:40 +02:00
Julian Ospald	d9fe4b8723	Use homebrew llvm	2021-06-11 22:17:18 +02:00
Julian Ospald	da2e7e0411	Fix aarch64 darwin thanks to bgamari	2021-06-11 22:17:02 +02:00
Julian Ospald	79d6a50e44	Drop some mingw64 packages we don't need	2021-06-11 22:12:23 +02:00
Julian Ospald	a13a5e5d20	Update darwin aarch64 install deps	2021-06-11 20:29:24 +02:00
Julian Ospald	82743dda2b	Merge remote-tracking branch 'origin/merge-requests/96'	2021-06-11 20:27:47 +02:00
jneira	6f80dd1fcc	Registry api win7 compat	2021-06-11 14:36:52 +02:00
Julian Ospald	1325dce493	Update darwin aarch64 install deps	2021-06-11 11:52:20 +02:00
Julian Ospald	ac21c19b7e	Remove unnecessary micro version stripping Since we can specify version bounds now, this is unnecessary.	2021-06-11 11:26:44 +02:00
Julian Ospald	2b4088d068	Add FreeBSD 8.10.5 tarballs	2021-06-10 18:24:42 +02:00
Julian Ospald	d86dc9b1d7	Fix release script	2021-06-10 15:39:50 +02:00
Julian Ospald	9982311c87	Update lzma-static	2021-06-10 15:10:53 +02:00
Julian Ospald	40c88d0b66	Add Darwin Big Sur AARCH64 binaries	2021-06-10 15:07:25 +02:00
Julian Ospald	e0ee1c2f94	Bump to 0.1.15.1	2021-06-10 14:00:26 +02:00
Julian Ospald	b4fa2780eb	Cleanup	2021-06-10 13:57:59 +02:00
Julian Ospald	df86183e97	Merge branch 'update-CI'	2021-06-10 13:57:36 +02:00
Julian Ospald	f7868dc646	Update install_deps	2021-06-10 13:57:02 +02:00
Julian Ospald	e742be7693	Allow to specify cabal directory	2021-06-10 10:58:24 +02:00
Julian Ospald	924bc8698d	Make Silent a switch	2021-06-10 10:58:07 +02:00
Julian Ospald	5214c35b20	Fix CI	2021-06-09 21:30:26 +02:00
Julian Ospald	700e04535a	Enable Mac AARCH64	2021-06-09 19:03:48 +02:00
Julian Ospald	fedc0bbef6	Debug	2021-06-09 18:38:24 +02:00
Julian Ospald	468fc5ade9	Use absolute ghcup binary path	2021-06-09 15:02:11 +02:00
Julian Ospald	2c077db36b	Improve portability	2021-06-09 14:43:48 +02:00
Julian Ospald	f80638bba4	Improve error handling	2021-06-09 14:43:36 +02:00
Julian Ospald	860aa0dafd	Improvements to bootstrap scripts	2021-06-08 23:46:20 +02:00
Julian Ospald	27510b3b51	Allow setting GHCUP_INSTALL_BASE_PREFIX on windows	2021-06-08 18:08:06 +02:00
Julian Ospald	96bcbbeeec	Update CI	2021-06-07 20:40:59 +02:00
Julian Ospald	8a632eb3b4	Merge branch 'windows-bootstrap-fixes'	2021-06-07 20:29:39 +02:00
Julian Ospald	aa992c0e5d	PrettyShow	2021-06-07 20:09:18 +02:00
Julian Ospald	810870e3a5	Fix Validate	2021-06-07 20:04:55 +02:00
Julian Ospald	d584e7b21b	Update shimgen URL	2021-06-07 20:04:45 +02:00
Julian Ospald	e93ac62c81	Add alpine 32 bit GHC-8.10.5	2021-06-07 20:04:27 +02:00
Julian Ospald	0d7d6c8382	Fix CI	2021-06-07 19:35:06 +02:00
Julian Ospald	5cd9ce8835	Fix build with zip	2021-06-07 19:33:12 +02:00
Julian Ospald	443522d526	Improve windows bootstrapping and make msys2 configurable	2021-06-07 19:33:12 +02:00
Julian Ospald	9061e60518	Allow to run powershell script straight	2021-06-07 14:48:06 +02:00
Julian Ospald	d65ab434b2	Fix windows link	2021-06-06 15:33:57 +02:00
Julian Ospald	cff592db82	Update bootstrap-haskell	2021-06-06 15:32:38 +02:00
Julian Ospald	97029e8102	Merge remote-tracking branch 'origin/merge-requests/92'	2021-06-06 12:10:35 +02:00
Fendor	828fd9eb10	Mention HLS in Help Message	2021-06-06 11:59:51 +02:00
Julian Ospald	03800d3b74	Hardcode C:\ in windows bootstrap script	2021-06-06 11:59:05 +02:00
Julian Ospald	a47304e599	Add ghcup-0.0.5.yaml to cabal extra docs	2021-06-06 11:58:51 +02:00
Julian Ospald	7b050e9fe2	Fix ghcup-gen validation for global tools	2021-06-06 11:57:37 +02:00
Julian Ospald	687a1d0c88	Merge branch 'fix-freebsd-build'	2021-06-06 11:28:36 +02:00
Julian Ospald	e09e3c264d	Fix build on FreeBSD Related: https://gitlab.haskell.org/ghc/ghc/-/issues/19948	2021-06-06 11:08:40 +02:00
Julian Ospald	b56431b4e3	Update ghcup-0.0.x.yaml	2021-06-06 08:55:41 +02:00
Julian Ospald	70ad50010d	Merge remote-tracking branch 'origin/merge-requests/90'	2021-06-06 08:12:24 +02:00
amesgen	ca3a249bea	make ghcup-0.0.4.yaml compatible with ghcup-0.1.14.1	2021-06-06 04:30:23 +02:00
amesgen	4337cdc38d	add GHC 8.10.5	2021-06-06 04:18:03 +02:00
Julian Ospald	9f92e0bc86	Fix #136	2021-06-05 22:26:35 +02:00
Julian Ospald	98751cf8fb	Merge branch 'windows-support'	2021-06-05 22:25:16 +02:00
Julian Ospald	2cb1554244	Fix stray br	2021-06-02 23:25:44 +02:00
Julian Ospald	6f3c143228	Update www to indicate WSL2 is needed	2021-06-02 23:17:08 +02:00