Switch releases to Github CI

Fixes #429

.cirrus.yml

@@ -0,0 +1,20 @@
+freebsd_instance:
+  image_family: freebsd-13-1
+
+task:
+  env:
+    GHC_VER: 9.2.4
+    CABAL_VER: 3.6.2.0
+    ARTIFACT: "x86_64-portbld-freebsd-ghcup"
+    ARCH: 64
+    RUNNER_OS: FreeBSD
+    DISTRO: na
+    GITHUB_WORKSPACE: ${CIRRUS_WORKING_DIR}
+    JSON_VERSION: "0.0.7"
+    CIRRUS_CLONE_SUBMODULES: true
+  install_script: pkg install -y ghc hs-cabal-install git bash misc/compat10x misc/compat11x misc/compat12x gmake
+  script:
+    - bash .github/scripts/build.sh
+    - bash .github/scripts/test.sh
+  binaries_artifacts:
+    path: "out/x86_64-portbld-freebsd-ghcup-*"

.github/ghcup-run.files

@@ -0,0 +1,37 @@
+.
+./cabal
+./ghc
+./ghc-8.10.7
+./ghc-pkg
+./ghc-pkg-8.10.7
+./ghci
+./ghci-8.10.7
+./haddock
+./haddock-8.10.7
+./haskell-language-server-8.10.6
+./haskell-language-server-8.10.6~1.6.1.0
+./haskell-language-server-8.10.7
+./haskell-language-server-8.10.7~1.6.1.0
+./haskell-language-server-8.6.5
+./haskell-language-server-8.6.5~1.6.1.0
+./haskell-language-server-8.8.4
+./haskell-language-server-8.8.4~1.6.1.0
+./haskell-language-server-9.0.1
+./haskell-language-server-9.0.1~1.6.1.0
+./haskell-language-server-9.0.2
+./haskell-language-server-9.0.2~1.6.1.0
+./haskell-language-server-9.2.1
+./haskell-language-server-9.2.1~1.6.1.0
+./haskell-language-server-wrapper
+./haskell-language-server-wrapper-1.6.1.0
+./hp2ps
+./hp2ps-8.10.7
+./hpc
+./hpc-8.10.7
+./hsc2hs
+./hsc2hs-8.10.7
+./runghc
+./runghc-8.10.7
+./runhaskell
+./runhaskell-8.10.7
+./stack

.github/ghcup-run.files.alpine

@@ -0,0 +1,31 @@
+.
+./cabal
+./ghc
+./ghc-8.10.7
+./ghc-pkg
+./ghc-pkg-8.10.7
+./ghci
+./ghci-8.10.7
+./haddock
+./haddock-8.10.7
+./haskell-language-server-8.10.7
+./haskell-language-server-8.10.7~1.6.1.0
+./haskell-language-server-8.8.4
+./haskell-language-server-8.8.4~1.6.1.0
+./haskell-language-server-9.0.2
+./haskell-language-server-9.0.2~1.6.1.0
+./haskell-language-server-9.2.1
+./haskell-language-server-9.2.1~1.6.1.0
+./haskell-language-server-wrapper
+./haskell-language-server-wrapper-1.6.1.0
+./hp2ps
+./hp2ps-8.10.7
+./hpc
+./hpc-8.10.7
+./hsc2hs
+./hsc2hs-8.10.7
+./runghc
+./runghc-8.10.7
+./runhaskell
+./runhaskell-8.10.7
+./stack

.github/ghcup-run.files.windows

@@ -0,0 +1,81 @@
+.
+./cabal.exe
+./cabal.shim
+./ghc-8.10.7.exe
+./ghc-8.10.7.shim
+./ghc-pkg-8.10.7.exe
+./ghc-pkg-8.10.7.shim
+./ghc-pkg.exe
+./ghc-pkg.shim
+./ghc.exe
+./ghc.shim
+./ghci-8.10.7.exe
+./ghci-8.10.7.shim
+./ghci.exe
+./ghci.shim
+./ghcii-8.10.7.sh-8.10.7.exe
+./ghcii-8.10.7.sh-8.10.7.shim
+./ghcii-8.10.7.sh.exe
+./ghcii-8.10.7.sh.shim
+./ghcii.sh-8.10.7.exe
+./ghcii.sh-8.10.7.shim
+./ghcii.sh.exe
+./ghcii.sh.shim
+./haddock-8.10.7.exe
+./haddock-8.10.7.shim
+./haddock.exe
+./haddock.shim
+./haskell-language-server-8.10.6.exe
+./haskell-language-server-8.10.6.shim
+./haskell-language-server-8.10.6~1.6.1.0.exe
+./haskell-language-server-8.10.6~1.6.1.0.shim
+./haskell-language-server-8.10.7.exe
+./haskell-language-server-8.10.7.shim
+./haskell-language-server-8.10.7~1.6.1.0.exe
+./haskell-language-server-8.10.7~1.6.1.0.shim
+./haskell-language-server-8.6.5.exe
+./haskell-language-server-8.6.5.shim
+./haskell-language-server-8.6.5~1.6.1.0.exe
+./haskell-language-server-8.6.5~1.6.1.0.shim
+./haskell-language-server-8.8.4.exe
+./haskell-language-server-8.8.4.shim
+./haskell-language-server-8.8.4~1.6.1.0.exe
+./haskell-language-server-8.8.4~1.6.1.0.shim
+./haskell-language-server-9.0.1.exe
+./haskell-language-server-9.0.1.shim
+./haskell-language-server-9.0.1~1.6.1.0.exe
+./haskell-language-server-9.0.1~1.6.1.0.shim
+./haskell-language-server-9.0.2.exe
+./haskell-language-server-9.0.2.shim
+./haskell-language-server-9.0.2~1.6.1.0.exe
+./haskell-language-server-9.0.2~1.6.1.0.shim
+./haskell-language-server-9.2.1.exe
+./haskell-language-server-9.2.1.shim
+./haskell-language-server-9.2.1~1.6.1.0.exe
+./haskell-language-server-9.2.1~1.6.1.0.shim
+./haskell-language-server-wrapper-1.6.1.0.exe
+./haskell-language-server-wrapper-1.6.1.0.shim
+./haskell-language-server-wrapper.exe
+./haskell-language-server-wrapper.shim
+./hp2ps-8.10.7.exe
+./hp2ps-8.10.7.shim
+./hp2ps.exe
+./hp2ps.shim
+./hpc-8.10.7.exe
+./hpc-8.10.7.shim
+./hpc.exe
+./hpc.shim
+./hsc2hs-8.10.7.exe
+./hsc2hs-8.10.7.shim
+./hsc2hs.exe
+./hsc2hs.shim
+./runghc-8.10.7.exe
+./runghc-8.10.7.shim
+./runghc.exe
+./runghc.shim
+./runhaskell-8.10.7.exe
+./runhaskell-8.10.7.shim
+./runhaskell.exe
+./runhaskell.shim
+./stack.exe
+./stack.shim

.github/scripts/bootstrap.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -eux
+
+. .github/scripts/prereq.sh
+
+mkdir -p "$CI_PROJECT_DIR"/.local/bin
+
+git describe --always
+
+### build
+
+./scripts/bootstrap/bootstrap-haskell
+
+[ "$(ghc --numeric-version)" = "${BOOTSTRAP_HASKELL_GHC_VERSION}" ]
+

.github/scripts/build.sh

@@ -0,0 +1,62 @@
+#!/bin/sh
+
+set -eux
+
+. .github/scripts/prereq.sh
+
+if ! command -v ghcup && [ "${RUNNER_OS}" != "FreeBSD" ] ; then
+	find "$GHCUP_INSTALL_BASE_PREFIX"
+	mkdir -p "$GHCUP_BIN"
+	mkdir -p "$GHCUP_BIN"/../cache
+	curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 BOOTSTRAP_HASKELL_MINIMAL=1 sh
+fi
+
+if [ "${RUNNER_OS}" != "FreeBSD" ] ; then
+	ghcup install ghc --set --isolate="$HOME/.local"     --force "$GHC_VER"
+	ghcup install cabal     --isolate="$HOME/.local/bin" --force "$CABAL_VER"
+	ghc --version
+	cabal --version
+	GHC="ghc-${GHC_VER}"
+else
+	GHC="ghc"
+fi
+
+git describe --all
+
+ecabal() {
+	cabal "$@"
+}
+
+# build
+ecabal update
+
+
+if [ "${RUNNER_OS}" = "Linux" ] ; then
+	if [ "${ARCH}" = "32" ] ; then
+		ecabal build -w "${GHC}" --ghc-options='-split-sections -optl-static' -ftui
+	elif [ "${ARCH}" = "64" ] ; then
+		ecabal build -w "${GHC}" --ghc-options='-split-sections -optl-static' -ftui
+	else
+		ecabal build -w "${GHC}" -ftui
+	fi
+elif [ "${RUNNER_OS}" = "FreeBSD" ] ; then
+	ecabal build -w "${GHC}" --ghc-options='-split-sections' --constraint="zlib +bundled-c-zlib" --constraint="zip +disable-zstd" -ftui
+elif [ "${RUNNER_OS}" = "Windows" ] ; then
+	ecabal build -w "${GHC}" --constraint="zlib +bundled-c-zlib" --constraint="lzma +static"
+else
+	ecabal build -w "${GHC}" --constraint="zlib +bundled-c-zlib" --constraint="lzma +static" -ftui
+fi
+
+mkdir out
+binary=$(ecabal new-exec -w "${GHC}" --verbose=0 --offline sh -- -c 'command -v ghcup')
+ver=$("${binary}" --numeric-version)
+if [ "${RUNNER_OS}" = "macOS" ] ; then
+	strip "${binary}"
+else
+	if [ "${RUNNER_OS}" != "Windows" ] ; then
+		strip -s "${binary}"
+	fi
+fi
+cp "${binary}" "out/${ARTIFACT}-${ver}"
+cp ./dist-newstyle/cache/plan.json "out/${ARTIFACT}.plan.json"
+

.github/scripts/hls.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+
+set -eux
+
+. .github/scripts/prereq.sh
+
+mkdir -p "$CI_PROJECT_DIR"/.local/bin
+
+### build
+
+ecabal() {
+	cabal "$@"
+}
+
+raw_eghcup() {
+	"$GHCUP_BIN/ghcup${ext}" -v -c "$@"
+}
+
+eghcup() {
+	if [ "${OS}" = "Windows" ] ; then
+		"$GHCUP_BIN/ghcup${ext}" -v -c -s file:/$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml "$@"
+	else
+		"$GHCUP_BIN/ghcup${ext}" -v -c -s file://$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml "$@"
+	fi
+}
+
+sha_sum() {
+	if [ "${OS}" = "FreeBSD" ] ; then
+		sha256 "$@"
+	else
+		sha256sum "$@"
+	fi
+
+}
+
+if [ "${OS}" = "Windows" ] ; then
+	GHCUP_DIR="${GHCUP_INSTALL_BASE_PREFIX}"/ghcup
+else
+	GHCUP_DIR="${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup
+fi
+
+rm -rf "${GHCUP_DIR}"
+mkdir -p "${GHCUP_BIN}"
+
+if [ "${OS}" = "Windows" ] ; then
+	ext=".exe"
+else
+	ext=''
+fi
+ls -lah out
+find out
+cp "out/${ARTIFACT}"-* "$GHCUP_BIN/ghcup${ext}"
+chmod +x "$GHCUP_BIN/ghcup${ext}"
+echo "$PATH"
+
+"$GHCUP_BIN/ghcup${ext}" --version
+eghcup --version
+sha_sum "$GHCUP_BIN/ghcup${ext}"
+sha_sum "$(raw_eghcup --offline whereis ghcup)"
+
+git describe --always
+
+eghcup install ghc "${GHC_VERSION}"
+eghcup install cabal
+
+ecabal update
+
+eghcup debug-info
+
+eghcup compile hls -j $(nproc) -g ${HLS_TARGET_VERSION} --ghc ${GHC_VERSION}
+
+[ `$(eghcup whereis hls ${HLS_TARGET_VERSION}) --numeric-version` = "${HLS_TARGET_VERSION}" ] || [ `$(eghcup whereis hls ${HLS_TARGET_VERSION}) --numeric-version | sed 's/.0$//'` = "${HLS_TARGET_VERSION}" ]
+
+# nuke
+eghcup nuke
+[ ! -e "${GHCUP_DIR}" ]
+

.github/scripts/prereq.sh

@@ -0,0 +1,76 @@
+#!/bin/sh
+
+mkdir -p "$HOME"/.local/bin
+
+export OS="$RUNNER_OS"
+export PATH="$HOME/.local/bin:$PATH"
+
+if [ "${RUNNER_OS}" = "Windows" ] ; then
+	# on windows use pwd to get unix style path
+	CI_PROJECT_DIR="$(pwd)"
+	export CI_PROJECT_DIR
+    export GHCUP_INSTALL_BASE_PREFIX="/c"
+    export GHCUP_BIN="$GHCUP_INSTALL_BASE_PREFIX/ghcup/bin"
+    export PATH="$GHCUP_BIN:$PATH"
+else
+	export CI_PROJECT_DIR="${GITHUB_WORKSPACE}"
+    export GHCUP_INSTALL_BASE_PREFIX="$CI_PROJECT_DIR"
+    export GHCUP_BIN="$GHCUP_INSTALL_BASE_PREFIX/.ghcup/bin"
+    export PATH="$GHCUP_BIN:$PATH"
+    export CABAL_DIR="$CI_PROJECT_DIR/cabal"
+    export CABAL_CACHE="$CI_PROJECT_DIR/cabal-cache"
+fi
+
+if [ "${RUNNER_OS}" = "Linux" ] ; then
+	if [ "${DISTRO}" = "Alpine" ] ; then
+          apk add --no-cache \
+            curl \
+            gcc \
+            g++ \
+            binutils \
+            binutils-gold \
+            bsd-compat-headers \
+            gmp-dev \
+            ncurses-dev \
+            libffi-dev \
+            make \
+            xz \
+            tar \
+            perl \
+            bash \
+            diffutils \
+            git
+
+          apk add --no-cache \
+            zlib \
+            zlib-dev \
+            zlib-static \
+            bzip2 \
+            bzip2-dev \
+            bzip2-static \
+            gmp \
+            gmp-dev \
+            openssl-dev \
+            openssl-libs-static \
+            xz \
+            xz-dev \
+            ncurses-static
+	elif [ "${DISTRO}" = "Ubuntu" ] ; then
+		sudo apt-get update -y
+		sudo apt-get install -y libnuma-dev zlib1g-dev libgmp-dev libgmp10 libssl-dev liblzma-dev libbz2-dev git wget lsb-release software-properties-common gnupg2 apt-transport-https gcc autoconf automake build-essential
+	fi
+elif [ "${RUNNER_OS}" = "macOS" ] ; then
+	if ! command -v brew ; then
+		[ -e "$HOME/.brew" ] ||
+			git clone --depth=1 https://github.com/Homebrew/brew "$HOME/.brew"
+		export PATH="$HOME/.brew/bin:$HOME/.brew/sbin:$PATH"
+		brew update
+	fi
+	if ! command -v git ; then
+		brew install git
+	fi
+	if ! command -v realpath ; then
+		brew install coreutils
+	fi
+fi
+

.github/scripts/test.sh

@@ -0,0 +1,284 @@
+#!/usr/bin/env bash
+
+set -eux
+
+. .github/scripts/prereq.sh
+
+ecabal() {
+	cabal "$@"
+}
+
+raw_eghcup() {
+	"$GHCUP_BIN/ghcup${ext}" -v -c "$@"
+}
+
+eghcup() {
+	if [ "${OS}" = "Windows" ] ; then
+		"$GHCUP_BIN/ghcup${ext}" -v -c -s file:/$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml "$@"
+	else
+		"$GHCUP_BIN/ghcup${ext}" -v -c -s file://$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml "$@"
+	fi
+}
+
+sha_sum() {
+	if [ "${OS}" = "FreeBSD" ] ; then
+		sha256 "$@"
+	else
+		sha256sum "$@"
+	fi
+
+}
+
+if [ "${OS}" = "Windows" ] ; then
+	GHCUP_DIR="${GHCUP_INSTALL_BASE_PREFIX}"/ghcup
+else
+	GHCUP_DIR="${GHCUP_INSTALL_BASE_PREFIX}"/.ghcup
+fi
+
+git describe --always
+
+
+rm -rf "${GHCUP_DIR}"
+mkdir -p "${GHCUP_BIN}"
+
+if [ "${OS}" = "Windows" ] ; then
+	ext=".exe"
+else
+	ext=''
+fi
+ls -lah out
+find out
+cp "out/${ARTIFACT}"-* "$GHCUP_BIN/ghcup${ext}"
+chmod +x "$GHCUP_BIN/ghcup${ext}"
+echo "$PATH"
+
+"$GHCUP_BIN/ghcup${ext}" --version
+eghcup --version
+sha_sum "$GHCUP_BIN/ghcup${ext}"
+sha_sum "$(raw_eghcup --offline whereis ghcup)"
+
+### manual cli based testing
+
+eghcup --numeric-version
+
+eghcup install ghc ${GHC_VER}
+eghcup unset ghc ${GHC_VER}
+ls -lah "$(eghcup whereis -d ghc ${GHC_VER})"
+[ "`$(eghcup whereis ghc ${GHC_VER}) --numeric-version`" = "${GHC_VER}" ]
+[ "`eghcup run --ghc ${GHC_VER} -- ghc --numeric-version`" = "${GHC_VER}" ]
+[ "`ghcup run --ghc ${GHC_VER} -- ghc -e 'Control.Monad.join (Control.Monad.fmap System.IO.putStr System.Environment.getExecutablePath)'`" = "`$(ghcup whereis ghc ${GHC_VER}) -e 'Control.Monad.join (Control.Monad.fmap System.IO.putStr System.Environment.getExecutablePath)'`" ]
+eghcup set ghc ${GHC_VER}
+eghcup install cabal ${CABAL_VER}
+[ "`$(eghcup whereis cabal ${CABAL_VER}) --numeric-version`" = "${CABAL_VER}" ]
+eghcup unset cabal
+"$GHCUP_BIN"/cabal --version && exit 1 || echo yes
+
+# make sure no cabal is set when running 'ghcup run' to check that PATH propagages properly
+# https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/375
+[ "`eghcup run --cabal ${CABAL_VER} -- cabal --numeric-version`" = "${CABAL_VER}" ]
+eghcup set cabal ${CABAL_VER}
+
+[ "`$(eghcup whereis cabal ${CABAL_VER}) --numeric-version`" = "${CABAL_VER}" ]
+
+if [ "${OS}" != "FreeBSD" ] ; then
+	if [ "${ARCH}" = "64" ] && [ "${DISTRO}" != "Alpine" ] ; then
+		eghcup run --ghc 8.10.7 --cabal 3.4.1.0 --hls 1.6.1.0 --stack 2.7.3 --install --bindir "$(pwd)/.bin"
+		if [ "${OS}" = "Windows" ] ; then
+			cat "$( cd "$(dirname "$0")" ; pwd -P )/../ghcup-run.files.windows" | sort > expected.txt
+		elif [ "${DISTRO}" = "Alpine" ] ; then
+			cat "$( cd "$(dirname "$0")" ; pwd -P )/../ghcup-run.files.alpine" | sort > expected.txt
+		else
+			cat "$( cd "$(dirname "$0")" ; pwd -P )/../ghcup-run.files" | sort > expected.txt
+		fi
+		(cd ".bin" && find . | sort) > actual.txt
+		diff --strip-trailing-cr -w -u actual.txt expected.txt
+		rm actual.txt expected.txt
+		rm -rf .bin
+	fi
+fi
+
+cabal --version
+
+eghcup debug-info
+
+# also test etags
+eghcup list
+eghcup list -t ghc
+eghcup list -t cabal
+
+ghc_ver=$(ghc --numeric-version)
+ghc --version
+ghc-${ghc_ver} --version
+if [ "${OS}" != "Windows" ] ; then
+		ghci --version
+		ghci-${ghc_ver} --version
+fi
+
+
+if [ "${OS}" = "macOS" ] && [ "${ARCH}" = "ARM64" ] ; then
+	echo
+else
+	# test installing new ghc doesn't mess with currently set GHC
+	# https://gitlab.haskell.org/haskell/ghcup-hs/issues/7
+	if [ "${OS}" = "Linux" ] ; then
+		eghcup --downloader=wget prefetch ghc 8.10.3
+		eghcup --offline install ghc 8.10.3
+		if [ "${ARCH}" = "64" ] ; then
+		    if [ "${DISTRO}" = "Alpine" ] ; then
+				(cat "$( cd "$(dirname "$0")" ; pwd -P )/../ghc-8.10.3-linux.alpine.files" | sort) > expected.txt
+			else
+				(cat "$( cd "$(dirname "$0")" ; pwd -P )/../ghc-8.10.3-linux.files" | sort) > expected.txt
+			fi
+			(cd "${GHCUP_DIR}/ghc/8.10.3/" && find . | sort) > actual.txt
+			# ignore docs
+		    sed -i '/share\/doc/d' actual.txt
+		    sed -i '/share\/doc/d' expected.txt
+			diff --strip-trailing-cr -w -u actual.txt expected.txt
+			rm actual.txt expected.txt
+		fi
+	elif [ "${OS}" = "Windows" ] ; then
+		eghcup prefetch ghc 8.10.3
+		eghcup --offline install ghc 8.10.3
+		(cat "$( cd "$(dirname "$0")" ; pwd -P )/../ghc-8.10.3-windows.files" | sort) > expected.txt
+		(cd "${GHCUP_DIR}/ghc/8.10.3/" && find . | sort) > actual.txt
+		diff --strip-trailing-cr -w -u actual.txt expected.txt
+		rm actual.txt expected.txt
+	else
+		eghcup prefetch ghc 8.10.3
+		eghcup --offline install ghc 8.10.3
+	fi
+	[ "$(ghc --numeric-version)" = "${ghc_ver}" ]
+	eghcup --offline set 8.10.3
+	eghcup set 8.10.3
+	[ "$(ghc --numeric-version)" = "8.10.3" ]
+	eghcup set ${GHC_VER}
+	[ "$(ghc --numeric-version)" = "${ghc_ver}" ]
+	eghcup unset ghc
+    "$GHCUP_BIN"/ghc --numeric-version && exit 1 || echo yes
+	eghcup set ${GHC_VER}
+	eghcup --offline rm 8.10.3
+	[ "$(ghc --numeric-version)" = "${ghc_ver}" ]
+
+
+	ls -lah "$GHCUP_BIN"
+
+	if [ "${OS}" = "macOS" ] ; then
+		eghcup install hls
+		$(eghcup whereis hls) --version
+
+		eghcup install stack
+		$(eghcup whereis stack) --version
+	elif [ "${OS}" = "Linux" ] ; then
+		if [ "${ARCH}" = "64" ] && [ "${DISTRO}" != "Alpine" ] ; then
+			eghcup install hls
+			haskell-language-server-wrapper --version
+			eghcup unset hls
+			"$GHCUP_BIN"/haskell-language-server-wrapper --version && exit 1 || echo yes
+
+			eghcup install stack
+			stack --version
+			eghcup unset stack
+			"$GHCUP_BIN"/stack --version && exit 1 || echo yes
+		fi
+	fi
+fi
+
+
+
+# check that lazy loading works for 'whereis'
+cp "$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml" "$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml.bak"
+echo '**' > "$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml"
+eghcup whereis ghc $(ghc --numeric-version)
+mv -f "$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml.bak" "$CI_PROJECT_DIR/data/metadata/ghcup-${JSON_VERSION}.yaml"
+
+eghcup rm $(ghc --numeric-version)
+
+# https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/116
+if [ "${OS}" = "Linux" ] ; then
+	if [ "${ARCH}" = "64" ] ; then
+		eghcup install cabal -u https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal/3.7.0.0-pre20220407/cabal-install-3.7-x86_64-linux-alpine.tar.xz 3.4.0.0-rc4
+		eghcup rm cabal 3.4.0.0-rc4
+	fi
+fi
+
+eghcup gc -c
+
+# test etags
+rm -f "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml"
+raw_eghcup -s https://www.haskell.org/ghcup/data/ghcup-${JSON_VERSION}.yaml list
+# snapshot yaml and etags file
+etag=$(cat "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml.etags")
+sha=$(sha_sum "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml")
+# invalidate access time timer, which is 5minutes, so we re-download
+touch -a -m -t '199901010101' "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml"
+# redownload same file with some newlines added
+raw_eghcup -s https://www.haskell.org/ghcup/exp/ghcup-${JSON_VERSION}.yaml list
+# snapshot new yaml and etags file
+etag2=$(cat "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml.etags")
+sha2=$(sha_sum "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml")
+# compare
+[ "${etag}" != "${etag2}" ]
+[ "${sha}" != "${sha2}" ]
+# invalidate access time timer, which is 5minutes, but don't expect a re-download
+touch -a -m -t '199901010101' "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml"
+# this time, we expect the same hash and etag
+raw_eghcup -s https://www.haskell.org/ghcup/exp/ghcup-${JSON_VERSION}.yaml list
+etag3=$(cat "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml.etags")
+sha3=$(sha_sum "${GHCUP_DIR}/cache/ghcup-${JSON_VERSION}.yaml")
+[ "${etag2}" = "${etag3}" ]
+[ "${sha2}" = "${sha3}" ]
+
+# test isolated installs
+if [ "${DISTRO}" != "Alpine" ] ; then
+	eghcup install ghc -i "$(pwd)/isolated" 8.10.5
+	[ "$(isolated/bin/ghc --numeric-version)" = "8.10.5" ]
+	! eghcup install ghc -i "$(pwd)/isolated" 8.10.5
+	if [ "${ARCH}" = "64" ] ; then
+		if [ "${OS}" = "Linux" ] || [ "${OS}" = "Windows" ] ; then
+			eghcup install cabal -i "$(pwd)/isolated" 3.4.0.0
+			[ "$(isolated/cabal --numeric-version)" = "3.4.0.0" ]
+			eghcup install stack -i "$(pwd)/isolated" 2.7.3
+			[ "$(isolated/stack --numeric-version)" = "2.7.3" ]
+			eghcup install hls -i "$(pwd)/isolated" 1.3.0
+			[ "$(isolated/haskell-language-server-wrapper --numeric-version)" = "1.3.0" ] ||
+				[ "$(isolated/haskell-language-server-wrapper --numeric-version)" = "1.3.0.0" ]
+
+			# test that isolated installs don't clean up target directory
+			cat <<EOF > "${GHCUP_BIN}/gmake"
+#!/bin/bash
+exit 1
+EOF
+			chmod +x "${GHCUP_BIN}/gmake"
+			mkdir isolated_tainted/
+			touch isolated_tainted/lol
+
+			! eghcup install ghc -i "$(pwd)/isolated_tainted" 8.10.5 --force
+			[ -e "$(pwd)/isolated_tainted/lol" ]
+			rm "${GHCUP_BIN}/gmake"
+		fi
+	fi
+fi
+
+eghcup upgrade
+eghcup upgrade -f
+
+# restore old ghcup, because we want to test nuke
+cp "out/${ARTIFACT}"-* "$GHCUP_BIN/ghcup${ext}"
+chmod +x "$GHCUP_BIN/ghcup${ext}"
+
+# test that doing fishy symlinks into GHCup dir doesn't cause weird stuff on 'ghcup nuke'
+mkdir no_nuke/
+mkdir no_nuke/bar
+echo 'foo' > no_nuke/file
+echo 'bar' > no_nuke/bar/file
+ln -s "$CI_PROJECT_DIR"/no_nuke/ "${GHCUP_DIR}"/cache/no_nuke
+ln -s "$CI_PROJECT_DIR"/no_nuke/ "${GHCUP_DIR}"/logs/no_nuke
+
+# nuke
+eghcup nuke
+[ ! -e "${GHCUP_DIR}" ]
+
+# make sure nuke doesn't resolve symlinks
+[ -e "$CI_PROJECT_DIR"/no_nuke/file ]
+[ -e "$CI_PROJECT_DIR"/no_nuke/bar/file ]
+

.github/workflows/bootstrap.yaml

@@ -0,0 +1,46 @@
+name: Bootstrap tests
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  bootstrap:
+    name: bootstrap
+    runs-on: ${{ matrix.os }}
+    env:
+      BOOTSTRAP_HASKELL_CABAL_VERSION: 3.6.2.0
+      BOOTSTRAP_HASKELL_GHC_VERSION: 8.10.7
+      BOOTSTRAP_HASKELL_NONINTERACTIVE: yes
+      JSON_VERSION: "0.0.7"
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            DISTRO: Ubuntu
+          - os: macOS-10.15
+            DISTRO: na
+          - os: windows-latest
+            DISTRO: na
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+
+      - if: runner.os != 'Windows'
+        name: Run bootstrap
+        run: sh ./.github/scripts/bootstrap.sh
+        env:
+          DISTRO: ${{ matrix.DISTRO }}
+
+      - if: runner.os == 'Windows'
+        name: Run bootstrap
+        run: ./scripts/bootstrap/bootstrap-haskell.ps1 -InstallDir ${GITHUB_WORKSPACE} -BootstrapUrl ${GITHUB_WORKSPACE}/bootstrap-haskell -InBash
+        shell: pwsh

.github/workflows/hlint.yaml

@@ -0,0 +1,26 @@
+name: Hlint
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  hlint:
+    name: hlint
+    runs-on: ubuntu-latest
+    env:
+      JSON_VERSION: "0.0.7"
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+
+      - name: Run hlint
+        run: curl -sSL https://raw.github.com/ndmitchell/hlint/master/misc/run.sh | sh -s -- -r lib/ test/

.github/workflows/mkdocs.yaml

@@ -0,0 +1,33 @@
+name: MkDocs
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  mkdocs:
+    name: mkdocs
+    runs-on: ubuntu-latest
+    env:
+      JSON_VERSION: "0.0.7"
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+
+      - name: Install mkdocs deps
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y python3-pip
+          sudo pip3 install mkdocs
+
+      - name: Run mkdocs
+        run: |
+          mkdocs build

.github/workflows/release.yaml

@@ -1,109 +1,224 @@
-name: Create Release
+name: Build and release
 
 on:
   push:
+    branches:
+      - master
     tags:
       - 'v*'
+  pull_request:
+    branches:
+      - master
 
 jobs:
-  draft_release:
-    name: Draft Release
-    runs-on: ubuntu-latest
-    outputs:
-      upload_url: ${{ steps.create_release.outputs.upload_url }}
-
-    steps:
-      - name: Create Release
-        id: create_release
-        uses: actions/create-release@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          tag_name: ${{ github.ref }}
-          release_name: Release ${{ github.ref }}
-          body: |
-            Changes in this Release
-            - First Change
-            - Second Change
-          draft: true
-          prerelease: false
-
-  release-mac:
-    name: Create Release
-    needs: draft_release
+  build:
+    name: Build binary
     runs-on: ${{ matrix.os }}
     env:
+      CABAL_VER: 3.6.2.0
+      CACHE_VER: 1
       MACOSX_DEPLOYMENT_TARGET: 10.13
+      JSON_VERSION: "0.0.7"
     strategy:
       matrix:
-        os:
-          - macOS-10.15
+        include:
+          - os: ubuntu-latest
+            ARTIFACT: "i386-linux-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 32
+          - os: ubuntu-latest
+            ARTIFACT: "x86_64-linux-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 64
+          - os: [self-hosted, macOS, aarch64]
+            ARTIFACT: "aarch64-apple-darwin-ghcup"
+            GHC_VER: 9.2.5
+            ARCH: ARM64
+          - os: macOS-10.15
+            ARTIFACT: "x86_64-apple-darwin-ghcup"
+            GHC_VER: 9.2.5
+            ARCH: 64
+          - os: windows-latest
+            ARTIFACT: "x86_64-mingw64-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 64
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
-
-      - uses: haskell/actions/setup@v1.2
+        uses: actions/checkout@v3
         with:
-          ghc-version: 8.10.7
-          cabal-version: 3.6.2.0
+          submodules: 'true'
 
-      - name: create ~/.local/bin
-        run: mkdir -p "$HOME/.local/bin"
-        shell: bash
-
-      - name: Add ~/.local/bin to PATH
-        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
-        shell: bash
-
-      - name: Update cabal cache
-        run: cabal update
-        shell: bash
-
-      - name: Install cabal dependencies
-        run: cabal build --only-dependencies --constraint="zlib +bundled-c-zlib" --constraint="lzma +static" -ftui
-        shell: bash
-
-      - name: Build
-        run: cabal build --constraint="zlib +bundled-c-zlib" --constraint="lzma +static" -ftui
-        shell: bash
-
-      - name: Install
-        run: cp "$(cabal list-bin exe:ghcup)" ~/.local/bin/ghcup
-        shell: bash
-
-      - name: Strip
-        run: strip ~/.local/bin/ghcup
-        shell: bash
-
-      - name: Run tests
-        run: cabal test --constraint="zlib +bundled-c-zlib" --constraint="lzma +static" all
-        shell: bash
-
-      - name: Install git
-        run: brew install git
-
-      - name: set HOME
-        run: echo "HOME=$HOME" >> $GITHUB_ENV
-        shell: bash
-
-      - name: Set ASSET_PATH
-        run: echo "ASSET_PATH=$HOME/.local/bin/ghcup" >> $GITHUB_ENV
-        shell: bash
-
-      - name: Upload Release Asset
-        id: upload-release-asset
-        uses: actions/upload-release-asset@v1
+      - if: matrix.ARCH == '32' && runner.os == 'Linux'
+        name: Run build (32 bit linux)
+        uses: docker://i386/alpine:3.12
+        with:
+          args: sh .github/scripts/build.sh
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: Alpine
+
+      - if: matrix.ARCH == '64' && runner.os == 'Linux'
+        name: Run build (64 bit linux)
+        uses: docker://alpine:3.12
         with:
-          upload_url: ${{ needs.draft_release.outputs.upload_url }}
-          asset_path: ${{ env.ASSET_PATH }}
-          asset_name: ghcup-${{ matrix.os }}
-          asset_content_type: application/octet-stream
+          args: sh .github/scripts/build.sh
+        env:
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: Alpine
+
+      - if: runner.os != 'Linux'
+        name: Run build (windows/mac)
+        run: bash .github/scripts/build.sh
+        env:
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: na
 
       - if: always()
-        uses: actions/upload-artifact@v2
+        name: Upload artifact
+        uses: actions/upload-artifact@v3
         with:
-          name: plan.json
-          path: ./dist-newstyle/cache/plan.json
+          name: artifacts
+          path: |
+            ./out/*
 
+  test:
+    name: Test
+    needs: build
+    runs-on: ${{ matrix.os }}
+    env:
+      CABAL_VER: 3.6.2.0
+      CACHE_VER: 1
+      MACOSX_DEPLOYMENT_TARGET: 10.13
+      JSON_VERSION: "0.0.7"
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            ARTIFACT: "i386-linux-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 32
+            DISTRO: Alpine
+          - os: ubuntu-latest
+            ARTIFACT: "x86_64-linux-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 64
+            DISTRO: Alpine
+          - os: ubuntu-latest
+            ARTIFACT: "x86_64-linux-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 64
+            DISTRO: Ubuntu
+          - os: [self-hosted, macOS, aarch64]
+            ARTIFACT: "aarch64-apple-darwin-ghcup"
+            GHC_VER: 9.2.5
+            ARCH: ARM64
+            DISTRO: na
+          - os: macOS-10.15
+            ARTIFACT: "x86_64-apple-darwin-ghcup"
+            GHC_VER: 9.2.5
+            ARCH: 64
+            DISTRO: na
+          - os: windows-latest
+            ARTIFACT: "x86_64-mingw64-ghcup"
+            GHC_VER: 8.10.7
+            ARCH: 64
+            DISTRO: na
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: artifacts
+          path: ./out
+
+      - if: matrix.ARCH == '32' && runner.os == 'Linux' && matrix.DISTRO == 'Alpine'
+        name: Run build (32 bit linux Alpine)
+        uses: docker://i386/alpine:3.12
+        with:
+          args: sh .github/scripts/test.sh
+        env:
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: ${{ matrix.DISTRO }}
+
+      - if: matrix.ARCH == '64' && runner.os == 'Linux' && matrix.DISTRO == 'Alpine'
+        name: Run build (64 bit linux Alpine)
+        uses: docker://alpine:3.12
+        with:
+          args: sh .github/scripts/test.sh
+        env:
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: ${{ matrix.DISTRO }}
+
+      - if: runner.os == 'Linux' && matrix.DISTRO != 'Alpine'
+        name: Run build (64 bit linux)
+        run: sh .github/scripts/test.sh
+        env:
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: ${{ matrix.DISTRO }}
+
+      - if: runner.os != 'Linux'
+        name: Run build (windows/mac)
+        run: bash .github/scripts/test.sh
+        env:
+          ARTIFACT: ${{ matrix.ARTIFACT }}
+          ARCH: ${{ matrix.ARCH }}
+          GHC_VER: ${{ matrix.GHC_VER }}
+          DISTRO: ${{ matrix.DISTRO }}
+  hls:
+    name: hls
+    needs: build
+    runs-on: ubuntu-latest
+    env:
+      GHC_VERSION: "8.10.7"
+      HLS_TARGET_VERSION: "1.8.0.0"
+      CABAL_VERSION: "3.6.2.0"
+      JSON_VERSION: "0.0.7"
+      ARTIFACT: "x86_64-linux-ghcup"
+      DISTRO: Ubuntu
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: artifacts
+          path: ./out
+
+      - name: Run hls build
+        run: sh .github/scripts/hls.sh
+
+  release:
+    name: release
+    needs: [build, test, hls]
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: artifacts
+          path: ./out
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          files: |
+            ./out/*

.github/workflows/shellcheck.yaml

@@ -0,0 +1,28 @@
+name: Shellcheck
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  shellcheck:
+    name: shellcheck
+    runs-on: ubuntu-latest
+    env:
+      JSON_VERSION: "0.0.7"
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+
+      - name: Run shellcheck
+        uses: docker://koalaman/shellcheck-alpine
+        with:
+          args: shellcheck scripts/bootstrap/bootstrap-haskell

app/ghcup/GHCup/OptParse.hs

@@ -74,6 +74,7 @@ data Options = Options
     optVerbose     :: Maybe Bool
   , optCache       :: Maybe Bool
   , optMetaCache   :: Maybe Integer
+  , optPlatform    :: Maybe PlatformRequest
   , optUrlSource   :: Maybe URI
   , optNoVerify    :: Maybe Bool
   , optKeepDirs    :: Maybe KeepDirs
@@ -116,6 +117,16 @@ opts =
     <$> invertableSwitch "verbose" (Just 'v') False (help "Enable verbosity (default: disabled)")
     <*> invertableSwitch "cache" (Just 'c') False (help "Cache downloads in ~/.ghcup/cache (default: disabled)")
     <*> optional (option auto (long "metadata-caching" <> help "How long the yaml metadata caching interval is (in seconds), 0 to disable" <> internal))
+    <*> optional
+      (option
+        (eitherReader platformParser)
+        (  short 'p'
+        <> long "platform"
+        <> metavar "PLATFORM"
+        <> help
+             "Override for platform (triple matching ghc tarball names), e.g. x86_64-fedora27-linux"
+        )
+      )
     <*> optional
           (option
             (eitherReader parseUri)

app/ghcup/GHCup/OptParse/Config.hs

@@ -131,7 +131,8 @@ updateSettings UserSettings{..} Settings{..} =
        urlSource'  = fromMaybe urlSource uUrlSource
        noNetwork'  = fromMaybe noNetwork uNoNetwork
        gpgSetting' = fromMaybe gpgSetting uGPGSetting
-   in Settings cache' metaCache' noVerify' keepDirs' downloader' verbose' urlSource' noNetwork' gpgSetting' noColor
+       platformOverride' = uPlatformOverride <|> platformOverride
+   in Settings cache' metaCache' noVerify' keepDirs' downloader' verbose' urlSource' noNetwork' gpgSetting' noColor platformOverride'
 
 
 

app/ghcup/GHCup/OptParse/Install.hs

@@ -66,7 +66,6 @@ data InstallCommand = InstallGHC InstallOptions
 
 data InstallOptions = InstallOptions
   { instVer      :: Maybe ToolVersion
-  , instPlatform :: Maybe PlatformRequest
   , instBindist  :: Maybe URI
   , instSet      :: Bool
   , isolateDir   :: Maybe FilePath
@@ -176,18 +175,8 @@ Examples:
 
 installOpts :: Maybe Tool -> Parser InstallOptions
 installOpts tool =
-  (\p (u, v) b is f -> InstallOptions v p u b is f)
-    <$> optional
-          (option
-            (eitherReader platformParser)
-            (  short 'p'
-            <> long "platform"
-            <> metavar "PLATFORM"
-            <> help
-                 "Override for platform (triple matching ghc tarball names), e.g. x86_64-fedora27-linux"
-            )
-          )
-    <*> (   (   (,)
+  (\(u, v) b is f -> InstallOptions v u b is f)
+    <$> (   (   (,)
             <$> optional
                   (option
                     (eitherReader uriParser)
@@ -268,11 +257,10 @@ type InstallEffects = '[ AlreadyInstalled
 
 
 runInstTool :: AppState
-            -> Maybe PlatformRequest
             -> Excepts InstallEffects (ResourceT (ReaderT AppState IO)) a
             -> IO (VEither InstallEffects a)
-runInstTool appstate' mInstPlatform =
-  flip runReaderT (maybe appstate' (\x -> appstate'{ pfreq = x } :: AppState) mInstPlatform)
+runInstTool appstate' =
+  flip runReaderT appstate'
   . runResourceT
   . runE
     @InstallEffects
@@ -302,11 +290,10 @@ type InstallGHCEffects = '[ AlreadyInstalled
                           ]
 
 runInstGHC :: AppState
-           -> Maybe PlatformRequest
            -> Excepts InstallGHCEffects (ResourceT (ReaderT AppState IO)) a
            -> IO (VEither InstallGHCEffects a)
-runInstGHC appstate' mInstPlatform =
-  flip runReaderT (maybe appstate' (\x -> appstate'{ pfreq = x } :: AppState) mInstPlatform)
+runInstGHC appstate' =
+  flip runReaderT appstate'
   . runResourceT
   . runE
     @InstallGHCEffects
@@ -331,7 +318,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
   installGHC InstallOptions{..} = do
     s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
     (case instBindist of
-       Nothing -> runInstGHC s' instPlatform $ do
+       Nothing -> runInstGHC s' $ do
          (v, vi) <- liftE $ fromVersion instVer GHC
          liftE $ runBothE' (installGHCBin
                      (_tvVersion v)
@@ -342,7 +329,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
                    $ when instSet $ when (isNothing isolateDir) $ liftE $ void $ setGHC v SetGHCOnly Nothing
          pure vi
        Just uri -> do
-         runInstGHC s'{ settings = settings {noVerify = True}} instPlatform $ do
+         runInstGHC s'{ settings = settings {noVerify = True}} $ do
            (v, vi) <- liftE $ fromVersion instVer GHC
            liftE $ runBothE' (installGHCBindist
                        (DownloadInfo uri (Just $ RegexDir "ghc-.*") "")
@@ -403,7 +390,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
   installCabal InstallOptions{..} = do
     s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
     (case instBindist of
-       Nothing -> runInstTool s' instPlatform $ do
+       Nothing -> runInstTool s' $ do
          (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Cabal
          liftE $ runBothE' (installCabalBin
                                     v
@@ -412,7 +399,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
                                   ) $ when instSet $ when (isNothing isolateDir) $ liftE $ setCabal v
          pure vi
        Just uri -> do
-         runInstTool s'{ settings = settings { noVerify = True}} instPlatform $ do
+         runInstTool s'{ settings = settings { noVerify = True}} $ do
            (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Cabal
            liftE $ runBothE' (installCabalBindist
                                       (DownloadInfo uri Nothing "")
@@ -452,7 +439,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
   installHLS InstallOptions{..} = do
      s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
      (case instBindist of
-       Nothing -> runInstTool s' instPlatform $ do
+       Nothing -> runInstTool s' $ do
          (_tvVersion -> v, vi) <- liftE $ fromVersion instVer HLS
          liftE $ runBothE' (installHLSBin
                                     v
@@ -461,7 +448,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
                                   ) $ when instSet $ when (isNothing isolateDir) $ liftE $ setHLS v SetHLSOnly Nothing
          pure vi
        Just uri -> do
-         runInstTool s'{ settings = settings { noVerify = True}} instPlatform $ do
+         runInstTool s'{ settings = settings { noVerify = True}} $ do
            (_tvVersion -> v, vi) <- liftE $ fromVersion instVer HLS
            -- TODO: support legacy
            liftE $ runBothE' (installHLSBindist
@@ -502,7 +489,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
   installStack InstallOptions{..} = do
      s'@AppState{ dirs = Dirs{ .. } } <- liftIO getAppState'
      (case instBindist of
-        Nothing -> runInstTool s' instPlatform $ do
+        Nothing -> runInstTool s' $ do
           (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Stack
           liftE $ runBothE' (installStackBin
                                      v
@@ -511,7 +498,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
                                    ) $ when instSet $ when (isNothing isolateDir) $ liftE $ setStack v
           pure vi
         Just uri -> do
-          runInstTool s'{ settings = settings { noVerify = True}} instPlatform $ do
+          runInstTool s'{ settings = settings { noVerify = True}} $ do
             (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Stack
             liftE $ runBothE' (installStackBindist
                                        (DownloadInfo uri Nothing "")

app/ghcup/GHCup/OptParse/Whereis.hs

@@ -32,6 +32,7 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Options.Applicative.Help.Pretty ( text )
 import           Prelude                 hiding ( appendFile )
+import           System.Environment
 import           System.Exit
 import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
@@ -268,6 +269,13 @@ whereis :: ( Monad m
 whereis whereisCommand whereisOptions runAppState leanAppstate runLogger = do
   Dirs{ .. }  <- runReaderT getDirs leanAppstate
   case (whereisCommand, whereisOptions) of
+    (WhereisTool GHCup _, WhereisOptions{..}) -> do
+      loc <- liftIO (getExecutablePath >>= canonicalizePath )
+      if directory
+      then liftIO $ putStr $ takeDirectory loc
+      else liftIO $ putStr loc
+      pure ExitSuccess
+
     (WhereisTool tool (Just (GHCVersion v)), WhereisOptions{..}) ->
       runLeanWhereIs leanAppstate (do
         loc <- liftE $ whereIsTool tool v

app/ghcup/Main.hs

@@ -87,6 +87,7 @@ toSettings options = do
          urlSource   = maybe (fromMaybe (Types.urlSource defaultSettings) uUrlSource) (OwnSource . (:[]) . Right) optUrlSource
          noNetwork   = fromMaybe (fromMaybe (Types.noNetwork defaultSettings) uNoNetwork) optNoNetwork
          gpgSetting  = fromMaybe (fromMaybe (Types.gpgSetting defaultSettings) uGPGSetting) optGpg
+         platformOverride = optPlatform <|> (uPlatformOverride <|> Types.platformOverride defaultSettings)
      in (Settings {..}, keyBindings)
 #if defined(INTERNAL_DOWNLOADER)
    defaultDownloader = Internal
@@ -198,14 +199,14 @@ Report bugs at <https://gitlab.haskell.org/haskell/ghcup-hs/issues>|]
 
 
           let appState = do
-                pfreq <- (
-                  runLogger . runE @'[NoCompatiblePlatform, NoCompatibleArch, DistroNotFound] . liftE $ platformRequest
-                  ) >>= \case
-                          VRight r -> pure r
-                          VLeft e -> do
-                            runLogger
-                              (logError $ T.pack $ prettyShow e)
-                            exitWith (ExitFailure 2)
+                pfreq <- case platformOverride settings of
+                           Just pfreq' -> return pfreq'
+                           Nothing -> (runLogger . runE @'[NoCompatiblePlatform, NoCompatibleArch, DistroNotFound] . liftE $ platformRequest) >>= \case
+                                          VRight r -> pure r
+                                          VLeft e -> do
+                                            runLogger
+                                              (logError $ T.pack $ prettyShow e)
+                                            exitWith (ExitFailure 2)
 
                 ghcupInfo <-
                   ( flip runReaderT leanAppstate

cabal.project

@@ -5,7 +5,6 @@ optional-packages: ./vendored/*/*.cabal
 optimization: 2
 
 package ghcup
-    tests: True
     flags: +tui
 
 source-repository-package

data/config.yaml

@@ -75,3 +75,14 @@ url-source:
   # AddSource:
     # - Right: "file:///home/jule/git/ghcup-hs/ghcup-prereleases.yaml"
     # - Right: "file:///home/jule/git/ghcup-hs/ghcup-custom.yaml"
+
+# This is a way to override platform detection, e.g. when you're running
+# a Ubuntu derivate based on 18.04, you could do:
+#
+# platform-override:
+#   arch: A_64
+#   platform:
+#     contents: Ubuntu
+#     tag: Linux
+#   version: '18.04'
+platform-override: null

docs/guide.md

@@ -71,6 +71,20 @@ explaining all possible configurations can be found in this repo: [config.yaml](
 
 Partial configuration is fine. Command line options always override the config file settings.
 
+## Overriding distro detection
+
+If you're running e.g. an Ubuntu derivate based on 18.04 and ghcup is picking bindists that
+don't work well, you could do this in `config.yaml`:
+
+```yml
+platform-override:
+  arch: A_64
+  platform:
+    contents: Ubuntu
+    tag: Linux
+  version: '18.04'
+```
+
 ## Env variables
 
 This is the complete list of env variables that change GHCup behavior:

docs/index.md

@@ -16,7 +16,7 @@ hide:
 <p class="ghcup-intro">GHCup is an installer for the general purpose language <a href="https://www.haskell.org">Haskell</a>.</p>
 
 <div class="text-center main-buttons">
-<a href="install/" class="btn btn-primary" role="button">Getting Started</a>
+<a href="install/" class="btn btn-primary" role="button">Installation</a>
 <a href="steps/" class="btn btn-primary" role="button">First steps</a>
 <a href="guide/" class="btn btn-primary" role="button">User Guide</a>
 </div>

docs/install.md

@@ -1,10 +1,10 @@
-# Getting started
+# Installation
 
 GHCup makes it easy to install specific versions of GHC on GNU/Linux,
 macOS (aka Darwin), FreeBSD and Windows and can also bootstrap a fresh [Haskell developer environment](./install/#supported-tools) from scratch.
 It follows the UNIX philosophy of [do one thing and do it well](https://en.wikipedia.org/wiki/Unix_philosophy#Do_One_Thing_and_Do_It_Well). Similar in scope to [rustup](https://github.com/rust-lang-nursery/rustup.rs), [pyenv](https://github.com/pyenv/pyenv) and [jenv](http://www.jenv.be).
 
-## Installation
+## How to install
 
 The following commands will download the `ghcup` binary into `~/.ghcup/bin` (or `C:\ghcup\bin` on windows) and then
 run it to interactively install the [Haskell Toolchain](#supported-tools). These commands should be run as **non-root/non-admin
@@ -34,6 +34,45 @@ GHCup has two main channels for every tool: **recommended** and **latest**. By d
 
 Also see [tags and shortcuts](../guide/#tags-and-shortcuts) for more information.
 
+## System requirements
+
+### Linux Debian
+
+The following distro packages are required: `build-essential curl libffi-dev libffi6 libgmp-dev libgmp10 libncurses-dev libncurses5 libtinfo5`
+
+### Linux Ubuntu
+
+The following distro packages are required: `build-essential curl libffi-dev libffi6 libgmp-dev libgmp10 libncurses-dev libncurses5 libtinfo5`
+
+### Linux Fedora
+
+The following distro packages are required: `gcc gcc-c++ gmp gmp-devel make ncurses ncurses-compat-libs xz perl`
+
+### Linux CentOS
+
+The following distro packages are required: `gcc gcc-c++ gmp gmp-devel make ncurses ncurses-compat-libs xz perl`
+
+### Linux Alpine
+
+The following distro packages are required: `binutils-gold curl gcc g++ gmp-dev libc-dev libffi-dev make musl-dev ncurses-dev perl tar xz`
+
+### Linux (generic)
+
+You need the following packages: curl g++ gcc gmp make ncurses realpath xz-utils. Consult your distro documentation on the exact names of those packages.
+
+### Darwin
+
+On OS X, in the course of running ghcup you will be given a dialog box to install the command line tools. Accept and the requirements will be installed for you. You will then need to run the command again.
+On Darwin M1 you might also need a working llvm installed (e.g. via brew) and have the toolchain exposed in PATH.
+
+### FreeBSD
+
+The following distro packages are required: `curl gcc gmp gmake ncurses perl5 libffi libiconv`
+
+### Windows
+
+On Windows, msys2 should already have been set up during the installation, so most users should just proceed. If you are installing manually, make sure to have a working mingw64 toolchain and shell.
+
 ## Next steps
 
 1. Follow the [First steps guide](../steps) on how to build a "Hello world" program, use `ghc`, run an interactive REPL and create a Haskell project
@@ -55,14 +94,17 @@ GHCup supports the following tools, which are also known as the **Haskell Toolch
 <table>
 <thead><tr><th>GHC Version</th><th>Tags</th></tr></thead>
 <tbody>
-<tr><td>9.4.1</td><td><span style="color:blue">latest</span>, base-4.17.0.0</td></tr>
+<tr><td>9.4.3</td><td><span style="color:blue">latest</span>, base-4.17.0.0</td></tr>
+<tr><td>9.4.2</td><td>base-4.17.0.0</td></tr>
+<tr><td>9.4.1</td><td>base-4.17.0.0</td></tr>
+<tr><td>9.2.5</td><td><span style="color:green">recommended</span>, base-4.16.4.0</td></tr>
 <tr><td>9.2.4</td><td>base-4.16.3.0</td></tr>
 <tr><td>9.2.3</td><td>base-4.16.2.0</td></tr>
 <tr><td>9.2.2</td><td>base-4.16.1.0</td></tr>
 <tr><td>9.2.1</td><td>base-4.16.0.0</td></tr>
 <tr><td>9.0.2</td><td>base-4.15.1.0</td></tr>
 <tr><td>9.0.1</td><td>base-4.15.0.0</td></tr>
-<tr><td>8.10.7</td><td><span style="color:green">recommended</span>, base-4.14.3.0</td></tr>
+<tr><td>8.10.7</td><td>base-4.14.3.0</td></tr>
 <tr><td>8.10.6</td><td>base-4.14.3.0</td></tr>
 <tr><td>8.10.5</td><td>base-4.14.2.0</td></tr>
 <tr><td>8.10.4</td><td>base-4.14.1.0</td></tr>
@@ -93,7 +135,8 @@ GHCup supports the following tools, which are also known as the **Haskell Toolch
 <table>
 <thead><tr><th>Cabal Version</th><th>Tags</th></tr></thead>
 <tbody>
-<tr><td>3.6.2.0</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+<tr><td>3.8.1.0</td><td><span style="color:blue">latest</span></td></tr>
+<tr><td>3.6.2.0</td><td><span style="color:green">recommended</span></td></tr>
 <tr><td>3.6.0.0</td><td></td></tr>
 <tr><td>3.4.1.0</td><td></td></tr>
 <tr><td>3.4.0.0</td><td></td></tr>
@@ -108,7 +151,8 @@ GHCup supports the following tools, which are also known as the **Haskell Toolch
 <table>
 <thead><tr><th>HLS Version</th><th>Tags</th></tr></thead>
 <tbody>
-<tr><td>1.7.0.0</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+<tr><td>1.8.0.0</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+<tr><td>1.7.0.0</td><td></td></tr>
 <tr><td>1.6.1.0</td><td></td></tr>
 <tr><td>1.6.0.0</td><td></td></tr>
 <tr><td>1.5.1</td><td></td></tr>
@@ -125,7 +169,8 @@ GHCup supports the following tools, which are also known as the **Haskell Toolch
 <table>
 <thead><tr><th>Stack Version</th><th>Tags</th></tr></thead>
 <tbody>
-<tr><td>2.7.5</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+<tr><td>2.9.1</td><td><span style="color:blue">latest</span>, <span style="color:green">recommended</span></td></tr>
+<tr><td>2.7.5</td><td></td></tr>
 <tr><td>2.7.3</td><td></td></tr>
 <tr><td>2.7.1</td><td></td></tr>
 <tr><td>2.5.1</td><td></td></tr>
@@ -185,7 +230,7 @@ HLS bindists are experimental.
 
 Lower availability of bindists. Stack and HLS binaries are experimental.
 
-## Manual install
+## Manual installation
 
 Download the binary for your platform at [https://downloads.haskell.org/~ghcup/](https://downloads.haskell.org/~ghcup/)
 and place it into your `PATH` anywhere.

docs/steps.md

@@ -177,7 +177,7 @@ A more thorough introduction to GHCi can be found in the
 ### Using external packages in ghci
 
 By default, GHCi can only load and use packages that are
-[included with the GHC installation](https://downloads.haskell.org/ghc/latest/docs/html/users_guide/9.2.2-notes.html#included-libraries).
+[included with the GHC installation](https://downloads.haskell.org/ghc/9.4.2/docs/users_guide/9.4.2-notes.html#included-libraries).
 
 However, users of the [cabal-install](https://www.haskell.org/cabal) and
 [stack](http://haskellstack.org) build tools can download and load external packages

ghcup.cabal

@@ -174,7 +174,7 @@ library
     build-depends:
       , bzlib
       , process  ^>=1.6.11.0
-      , Win32    ^>=2.10
+      , Win32    >=2.10
 
   else
     other-modules:

lib/GHCup.hs

@@ -73,6 +73,7 @@ import           Prelude                 hiding ( abs
 import           System.Environment
 import           System.FilePath
 import           System.IO.Error
+import           System.IO.Temp
 import           Text.Regex.Posix
 
 import qualified Data.Text                     as T
@@ -133,6 +134,7 @@ rmTool :: ( MonadReader env m
           => ListResult
           -> Excepts '[NotInstalled, UninstallFailed] m ()
 rmTool ListResult {lVer, lTool, lCross} = do
+  logInfo $ "removing " <> T.pack (show lTool) <> " version " <> prettyVer lVer
   case lTool of
     GHC ->
       let ghcTargetVersion = GHCTargetVersion lCross lVer
@@ -364,11 +366,12 @@ rmGhcup = do
   if isWindows
   then do
     -- since it doesn't seem possible to delete a running exe on windows
-    -- we move it to temp dir, to be deleted at next reboot
-    tempFilepath <- mkGhcupTmpDir
+    -- we move it to system temp dir, to be deleted at next reboot
+    tmp <- liftIO $ getCanonicalTemporaryDirectory >>= \t -> createTempDirectory t "ghcup"
+    logDebug $ "mv " <> T.pack ghcupFilepath <> " " <> T.pack (tmp </> "ghcup")
     hideError UnsupportedOperation $
               liftIO $ hideError NoSuchThing $
-              moveFile ghcupFilepath (fromGHCupPath tempFilepath </> "ghcup")
+              moveFile ghcupFilepath (tmp </> "ghcup")
   else
     -- delete it.
     hideError doesNotExistErrorType $ rmFile ghcupFilepath

lib/GHCup/Types.hs

@@ -309,11 +309,12 @@ data UserSettings = UserSettings
   , uUrlSource   :: Maybe URLSource
   , uNoNetwork   :: Maybe Bool
   , uGPGSetting  :: Maybe GPGSetting
+  , uPlatformOverride    :: Maybe PlatformRequest
   }
   deriving (Show, GHC.Generic)
 
 defaultUserSettings :: UserSettings
-defaultUserSettings = UserSettings Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing
+defaultUserSettings = UserSettings Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing
 
 fromSettings :: Settings -> Maybe KeyBindings -> UserSettings
 fromSettings Settings{..} Nothing =
@@ -328,16 +329,17 @@ fromSettings Settings{..} Nothing =
     , uKeyBindings = Nothing
     , uUrlSource = Just urlSource
     , uGPGSetting = Just gpgSetting
+    , uPlatformOverride = platformOverride
   }
 fromSettings Settings{..} (Just KeyBindings{..}) =
   let ukb = UserKeyBindings
-            { kUp           = Just bUp        
-            , kDown         = Just bDown      
-            , kQuit         = Just bQuit      
-            , kInstall      = Just bInstall   
-            , kUninstall    = Just bUninstall 
-            , kSet          = Just bSet       
-            , kChangelog    = Just bChangelog 
+            { kUp           = Just bUp
+            , kDown         = Just bDown
+            , kQuit         = Just bQuit
+            , kInstall      = Just bInstall
+            , kUninstall    = Just bUninstall
+            , kSet          = Just bSet
+            , kChangelog    = Just bChangelog
             , kShowAll      = Just bShowAllVersions
             , kShowAllTools = Just bShowAllTools
             }
@@ -352,6 +354,7 @@ fromSettings Settings{..} (Just KeyBindings{..}) =
     , uKeyBindings = Just ukb
     , uUrlSource = Just urlSource
     , uGPGSetting = Just gpgSetting
+    , uPlatformOverride = platformOverride
   }
 
 data UserKeyBindings = UserKeyBindings
@@ -421,16 +424,17 @@ instance NFData LeanAppState
 
 
 data Settings = Settings
-  { cache      :: Bool
-  , metaCache  :: Integer
-  , noVerify   :: Bool
-  , keepDirs   :: KeepDirs
-  , downloader :: Downloader
-  , verbose    :: Bool
-  , urlSource  :: URLSource
-  , noNetwork  :: Bool
-  , gpgSetting :: GPGSetting
-  , noColor    :: Bool -- this also exists in LoggerConfig
+  { cache            :: Bool
+  , metaCache        :: Integer
+  , noVerify         :: Bool
+  , keepDirs         :: KeepDirs
+  , downloader       :: Downloader
+  , verbose          :: Bool
+  , urlSource        :: URLSource
+  , noNetwork        :: Bool
+  , gpgSetting       :: GPGSetting
+  , noColor          :: Bool -- this also exists in LoggerConfig
+  , platformOverride :: Maybe PlatformRequest
   }
   deriving (Show, GHC.Generic)
 
@@ -438,7 +442,7 @@ defaultMetaCache :: Integer
 defaultMetaCache = 300 -- 5 minutes
 
 defaultSettings :: Settings
-defaultSettings = Settings False defaultMetaCache False Never Curl False GHCupURL False GPGNone False
+defaultSettings = Settings False defaultMetaCache False Never Curl False GHCupURL False GPGNone False Nothing
 
 instance NFData Settings
 

lib/GHCup/Types/JSON.hs

@@ -56,6 +56,7 @@ deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''Global
 deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''KeepDirs
 deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''Downloader
 deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''GPGSetting
+deriveJSON defaultOptions { fieldLabelModifier = \str' -> maybe str' T.unpack . T.stripPrefix (T.pack "r-") . T.pack . kebab . tail $ str' } ''PlatformRequest
 
 instance ToJSON Tag where
   toJSON Latest             = String "Latest"

mkdocs.yml

@@ -13,7 +13,7 @@ theme:
 
 nav:
   - Home: index.md
-  - "Getting started": install.md
+  - "Installation": install.md
   - "First steps": steps.md
   - "User Guide": guide.md
   - "Developer Guide": dev.md

scripts/bootstrap/bootstrap-haskell

@@ -12,7 +12,8 @@
 #   * BOOTSTRAP_HASKELL_VERBOSE - any nonzero value for more verbose installation
 #   * BOOTSTRAP_HASKELL_GHC_VERSION - the ghc version to install
 #   * BOOTSTRAP_HASKELL_CABAL_VERSION - the cabal version to install
-#   * BOOTSTRAP_HASKELL_INSTALL_STACK - whether to install latest stack
+#   * BOOTSTRAP_HASKELL_INSTALL_NO_STACK - disable installation of stack
+#   * BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK - disable installation stack ghcup hook
 #   * BOOTSTRAP_HASKELL_INSTALL_HLS - whether to install latest hls
 #   * BOOTSTRAP_HASKELL_ADJUST_BASHRC - whether to adjust PATH in bashrc (prepend)
 #   * BOOTSTRAP_HASKELL_ADJUST_CABAL_CONFIG - whether to adjust mingw paths in cabal.config on windows
@@ -135,11 +136,8 @@ _eghcup() {
     fi
 }
 
-ecabal() {
-	edo _ecabal "$@"
-}
-
 _ecabal() {
+    # shellcheck disable=SC2317
     if [ -n "${CABAL_BIN}" ] ; then
         "${CABAL_BIN}" "$@"
     else
@@ -148,6 +146,10 @@ _ecabal() {
     fi
 }
 
+ecabal() {
+	edo _ecabal "$@"
+}
+
 _done() {
 	echo
 	echo "==============================================================================="
@@ -402,7 +404,11 @@ download_ghcup() {
 find_shell() {
 	case $SHELL in
 		*/zsh) # login shell is zsh
-			GHCUP_PROFILE_FILE="$HOME/.zshrc"
+			if [ -n "$ZDOTDIR" ]; then
+				GHCUP_PROFILE_FILE="$ZDOTDIR/.zshrc"
+			else
+				GHCUP_PROFILE_FILE="$HOME/.zshrc"
+			fi
 			MY_SHELL="zsh" ;;
 		*/bash) # login shell is bash
 			GHCUP_PROFILE_FILE="$HOME/.bashrc"
@@ -692,40 +698,44 @@ ask_hls() {
 }
 
 ask_stack() {
-	if [ -n "${BOOTSTRAP_HASKELL_INSTALL_STACK}" ] ; then
+    if [ -n "${BOOTSTRAP_HASKELL_INSTALL_NO_STACK}" ] ; then
+		return 0
+    elif [ -n "${BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK}" ] ; then
 		return 1
 	fi
 
 	if [ -z "${BOOTSTRAP_HASKELL_NONINTERACTIVE}" ] ; then
 		echo "-------------------------------------------------------------------------------"
 
-		warn "Do you want to install stack?"
-		warn "Stack is a haskell build tool similar to cabal that is used by some projects."
-		warn "Also see https://docs.haskellstack.org/"
+		warn "Do you want to enable better integration of stack with GHCup?"
+        warn "This means that stack won't install its own GHC versions, but uses GHCup's."
+        warn "For more information see:"
+        warn "  https://docs.haskellstack.org/en/stable/yaml_configuration/#ghc-installation-customisation-experimental"
+        warn "If you want to keep stacks vanilla behavior, answer 'No'."
 		warn ""
-		warn "[Y] Yes  [N] No  [?] Help (default is \"N\")."
+		warn "[Y] Yes  [N] No  [?] Help (default is \"Y\")."
 		warn ""
 
 		while true; do
 			read -r stack_answer </dev/tty
 
 			case $stack_answer in
-				[Yy]*)
+				[Yy]* | "")
+					return 2 ;;
+				[Nn]*)
 					return 1 ;;
-				[Nn]* | "")
-					return 0 ;;
 				*)
 					echo "Possible choices are:"
 					echo
-					echo "Y - Yes, install stack"
-					echo "N - No, don't install anything more (default)"
+                    echo "Y - Yes, enable better integration (default)"
+					echo "N - No, keep stacks vanilla behavior"
 					echo
 					echo "Please make your choice and press ENTER."
 					;;
 			esac
 		done
 	else
-		return 0
+		return 2
 	fi
 
 	unset stack_answer
@@ -742,7 +752,7 @@ echo "This script can download and install the following binaries:"
 echo "  * ghcup - The Haskell toolchain installer"
 echo "  * ghc   - The Glasgow Haskell Compiler"
 echo "  * cabal - The Cabal build tool for managing Haskell software"
-echo "  * stack - (optional) A cross-platform program for developing Haskell projects"
+echo "  * stack - A cross-platform program for developing Haskell projects (similar to cabal)"
 echo "  * hls   - (optional) A language server for developers to integrate with their editor/IDE"
 echo
 if [ -z "${GHCUP_USE_XDG_DIRS}" ] ; then
@@ -839,7 +849,35 @@ esac
 
 case $ask_stack_answer in
 	1)
-		_eghcup --cache install stack || warn "Stack installation failed, continuing anyway"
+		_eghcup --cache install stack || die "Stack installation failed"
+		;;
+	2)
+		_eghcup --cache install stack || die "Stack installation failed"
+        edo mkdir -p "${STACK_ROOOT:-$HOME/.stack}"/hooks
+        hook_exe="${STACK_ROOOT:-$HOME/.stack}"/hooks/ghc-install.sh
+        hook_url="https://www.haskell.org/ghcup/sh/hooks/stack/ghc-install.sh"
+
+        if [ -e "${hook_exe}" ] ; then
+            warn "$hook_exe already exists, skipping hook installation."
+            warn "If you want to reinstall the hook, delete it manually and re-run"
+            warn "this script!"
+        else
+            case "${BOOTSTRAP_HASKELL_DOWNLOADER}" in
+                "curl")
+                    # shellcheck disable=SC2086
+                    edo curl -Lf ${GHCUP_CURL_OPTS} "${hook_url}" > "${hook_exe}"
+                    ;;
+                "wget")
+                    # shellcheck disable=SC2086
+                    edo wget -O /dev/stdout ${GHCUP_WGET_OPTS} "${hook_url}" > "${hook_exe}"
+                    ;;
+                *)
+                    die "Unknown downloader: ${BOOTSTRAP_HASKELL_DOWNLOADER}"
+                    ;;
+            esac
+            edo chmod +x "${hook_exe}"
+        fi
+
 		;;
 	*) ;;
 esac

scripts/bootstrap/bootstrap-haskell.ps1

@@ -577,8 +577,8 @@ $Msys2Shell = ('{0}\msys2_shell.cmd' -f $MsysDir)
 # The bootstrap script is always silent, since we ask relevant questions here
 $SilentExport = 'export BOOTSTRAP_HASKELL_NONINTERACTIVE=1 ;'
 
-if ($InstallStack) {
-  $StackInstallExport = 'export BOOTSTRAP_HASKELL_INSTALL_STACK=1 ;'
+if (!($InstallStack)) {
+  $StackInstallExport = 'export BOOTSTRAP_HASKELL_INSTALL_NO_STACK=1 ;'
 }
 
 if ($InstallHLS) {

scripts/hooks/stack/ghc-install.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# !! KEEP THIS SCRIPT POSIX COMPLIANT !!
+
+# see https://docs.haskellstack.org/en/stable/yaml_configuration/#ghc-installation-customisation-experimental
+# for documentation about hooks
+
+set -eu
+
+case $HOOK_GHC_TYPE in
+    bindist)
+        ghcdir=$(ghcup whereis --directory ghc "$HOOK_GHC_VERSION" || ghcup run --ghc "$HOOK_GHC_VERSION" --install) || exit 3
+        printf "%s/ghc" "${ghcdir}"
+        ;;
+    git)
+        # TODO: should be somewhat possible
+        >&2 echo "Hook doesn't support installing from source"
+        exit 1
+        ;;
+    *)
+        >&2 echo "Unsupported GHC installation type: $HOOK_GHC_TYPE"
+        exit 2
+        ;;
+esac