Fix CI

Fixes #751 (or so I hope).

.github/scripts/common.sh

@@ -129,27 +129,6 @@ build_with_cache() {
 }
 
 install_ghcup() {
-	case "${RUNNER_OS}" in
-		"Linux")
-			case "${ARCH}" in
-				"ARM"*)
-					if command -v ghcup ; then
-						mkdir -p "$GHCUP_BIN"
-						cp "$(command -v ghcup)" "$GHCUP_BIN/ghcup${ext}"
-					else
-						install_ghcup_curl_sh
-					fi
-					;;
-				*) install_ghcup_curl_sh
-					;;
-			esac
-			;;
-			*) install_ghcup_curl_sh
-			;;
-	esac
-}
-
-install_ghcup_curl_sh() {
 	curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 BOOTSTRAP_HASKELL_MINIMAL=1 BOOTSTRAP_HASKELL_INSTALL_NO_STACK=yes sh
 }
 

.github/workflows/docker.yaml

@@ -72,20 +72,12 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build and push (debian buster)
+      - name: Build and push
         uses: docker/build-push-action@v3
         with:
-          context: ./docker/arm32v7/buster
+          context: ./docker/arm32v7
           push: true
-          tags: hasufell/arm32v7-debian-haskell:10
-          platforms: linux/arm
-
-      - name: Build and push (ubuntu focal)
-        uses: docker/build-push-action@v3
-        with:
-          context: ./docker/arm32v7/focal
-          push: true
-          tags: hasufell/arm32v7-debian-haskell:10
+          tags: hasufell/arm32v7-ubuntu-haskell:focal
           platforms: linux/arm
 
   docker-aarch:
@@ -108,18 +100,10 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build and push (debian buster)
+      - name: Build and push
         uses: docker/build-push-action@v3
         with:
-          context: ./docker/arm64v8/buster
+          context: ./docker/arm64v8/
           push: true
-          tags: hasufell/arm64v8-debian-haskell:10
-          platforms: linux/arm64
-
-      - name: Build and push (ubuntu focal)
-        uses: docker/build-push-action@v3
-        with:
-          context: ./docker/arm64v8/focal
-          push: true
-          tags: hasufell/arm64v8-debian-haskell:10
+          tags: hasufell/arm64v8-ubuntu-haskell:focal
           platforms: linux/arm64

.github/workflows/release.yaml

@@ -99,7 +99,7 @@ jobs:
             GHC_VER: 9.2.5
             ARCH: ARM64
     steps:
-      - uses: docker://arm64v8/debian:10
+      - uses: docker://arm64v8/ubuntu:focal
         name: Cleanup (aarch64 linux)
         with:
           args: "find . -mindepth 1 -maxdepth 1 -exec rm -rf -- {} +"
@@ -115,7 +115,7 @@ jobs:
           submodules: 'true'
 
       - if: matrix.ARCH == 'ARM'
-        uses: docker://hasufell/arm32v7-debian-haskell:10
+        uses: docker://hasufell/arm32v7-ubuntu-haskell:focal
         name: Run build (armv7 linux)
         with:
           args: sh .github/scripts/build.sh
@@ -129,7 +129,7 @@ jobs:
           S3_HOST: ${{ env.S3_HOST }}
 
       - if: matrix.ARCH == 'ARM64'
-        uses: docker://hasufell/arm64v8-debian-haskell:10
+        uses: docker://hasufell/arm64v8-ubuntu-haskell:focal
         name: Run build (aarch64 linux)
         with:
           args: sh .github/scripts/build.sh
@@ -342,7 +342,7 @@ jobs:
             DISTRO: Ubuntu
 
     steps:
-      - uses: docker://arm64v8/debian:10
+      - uses: docker://arm64v8/ubuntu:focal
         name: Cleanup (aarch64 linux)
         with:
           args: "find . -mindepth 1 -maxdepth 1 -exec rm -rf -- {} +"
@@ -358,7 +358,7 @@ jobs:
           path: ./out
 
       - if: matrix.ARCH == 'ARM'
-        uses: docker://hasufell/arm32v7-debian-haskell:10
+        uses: docker://hasufell/arm32v7-ubuntu-haskell:focal
         name: Run test (armv7 linux)
         with:
           args: sh .github/scripts/test.sh
@@ -369,7 +369,7 @@ jobs:
           DISTRO: Ubuntu
 
       - if: matrix.ARCH == 'ARM64'
-        uses: docker://hasufell/arm64v8-debian-haskell:10
+        uses: docker://hasufell/arm64v8-ubuntu-haskell:focal
         name: Run test (aarch64 linux)
         with:
           args: sh .github/scripts/test.sh

app/ghcup/GHCup/OptParse/Config.hs

@@ -51,7 +51,7 @@ data ConfigCommand
   = ShowConfig
   | SetConfig String (Maybe String)
   | InitConfig
-  | AddReleaseChannel URI
+  | AddReleaseChannel Bool URI
 
 
 
@@ -74,7 +74,7 @@ configP = subparser
   showP = info (pure ShowConfig) (progDesc "Show current config (default)")
   setP  = info argsP (progDesc "Set config KEY to VALUE (or specify as single json value)" <> footerDoc (Just $ text configSetFooter))
   argsP = SetConfig <$> argument str (metavar "<JSON_VALUE | YAML_KEY>") <*> optional (argument str (metavar "YAML_VALUE"))
-  addP  = info (AddReleaseChannel <$> argument (eitherReader uriParser) (metavar "URI" <> completer fileUri))
+  addP  = info (AddReleaseChannel <$> switch (long "force" <> help "Delete existing entry (if any) and append instead of failing") <*> argument (eitherReader uriParser) (metavar "URI" <> completer fileUri))
     (progDesc "Add a release channel from a URI")
 
 
@@ -159,6 +159,9 @@ updateSettings usl usr =
     --[ Entrypoint ]--
     ------------------
 
+data Duplicate = Duplicate     -- ^ there is a duplicate somewhere in the middle
+               | NoDuplicate   -- ^ there is no duplicate
+               | DuplicateLast -- ^ there's a duplicate, but it's the last element
 
 
 config :: forall m. ( Monad m
@@ -203,22 +206,50 @@ config configCommand settings userConf keybindings runLogger = case configComman
         pure $ ExitFailure 65
       VLeft _ -> pure $ ExitFailure 65
 
-  AddReleaseChannel uri -> do
-    case urlSource settings of
-      AddSource xs -> do
-        doConfig (defaultUserSettings { uUrlSource = Just $ AddSource (xs <> [Right uri]) })
-        pure ExitSuccess
-      GHCupURL -> do
-        doConfig (defaultUserSettings { uUrlSource = Just $ AddSource [Right uri] })
-        pure ExitSuccess
-      OwnSource xs -> do
-        doConfig (defaultUserSettings { uUrlSource = Just $ OwnSource (xs <> [Right uri]) })
-        pure ExitSuccess
-      OwnSpec spec -> do
-        doConfig (defaultUserSettings { uUrlSource = Just $ OwnSource ([Left spec, Right uri]) })
+  AddReleaseChannel force uri -> do
+    r <- runE @'[DuplicateReleaseChannel] $ do
+      case urlSource settings of
+        AddSource xs -> do
+          case checkDuplicate xs (Right uri) of
+            Duplicate
+              | not force -> throwE (DuplicateReleaseChannel uri)
+            DuplicateLast -> pure ()
+            _ -> lift $ doConfig (defaultUserSettings { uUrlSource = Just $ AddSource (appendUnique xs (Right uri)) })
+        GHCupURL -> do
+          lift $ doConfig (defaultUserSettings { uUrlSource = Just $ AddSource [Right uri] })
+          pure ()
+        OwnSource xs -> do
+          case checkDuplicate xs (Right uri) of
+            Duplicate
+              | not force -> throwE (DuplicateReleaseChannel uri)
+            DuplicateLast -> pure ()
+            _ -> lift $ doConfig (defaultUserSettings { uUrlSource = Just $ OwnSource (appendUnique xs (Right uri)) })
+        OwnSpec spec -> do
+          lift $ doConfig (defaultUserSettings { uUrlSource = Just $ OwnSource [Left spec, Right uri] })
+          pure ()
+    case r of
+      VRight _ -> do
         pure ExitSuccess
+      VLeft e -> do
+        runLogger $ logError $ T.pack $ prettyHFError e
+        pure $ ExitFailure 15
 
  where
+  checkDuplicate :: Eq a => [a] -> a -> Duplicate
+  checkDuplicate xs a
+    | last xs == a = DuplicateLast
+    | a `elem` xs  = Duplicate
+    | otherwise    = NoDuplicate
+
+  -- appends the element to the end of the list, but also removes it from the existing list
+  appendUnique :: Eq a => [a] -> a -> [a]
+  appendUnique xs' e = go xs'
+   where
+    go [] = [e]
+    go (x:xs)
+      | x == e    =     go xs -- skip
+      | otherwise = x : go xs
+
   doConfig :: MonadIO m => UserSettings -> m ()
   doConfig usersettings = do
     let settings' = updateSettings usersettings userConf

docker/arm32v7/Dockerfile

@@ -54,7 +54,10 @@ ENV NO_COLOR=1
 RUN ghcup config set gpg-setting GPGStrict && \
 	ghcup --verbose install ghc   --isolate=/usr     --force ${GHC} && \
 	ghcup --verbose install cabal --isolate=/usr/bin --force ${CABAL_INSTALL} && \
-	ghcup gc -s -c -t
+	find "/usr/lib/ghc-${GHC}/" \( -name "*_p.a" -o -name "*.p_hi" \) -type f -delete && \
+	rm -r "/usr/share/doc/ghc-${GHC}" && \
+	rm -rf /tmp/ghcup* && \
+	ghcup gc -p -s -c -t
 
 ENV PATH /root/.cabal/bin:/root/.ghcup/bin:/root/.local/bin:$PATH
 

docker/arm32v7/buster/Dockerfile

@@ -1,61 +0,0 @@
-FROM arm32v7/debian:10
-
-ENV LANG C.UTF-8
-ENV DEBIAN_FRONTEND=noninteractive
-ENV TZ=Asia/Singapore
-
-COPY update_opt.sh /usr/bin/update_opt.sh
-RUN chmod +x /usr/bin/update_opt.sh
-
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        ca-certificates \
-        curl \
-        dirmngr \
-        g++ \
-        git \
-        gnupg \
-        libsqlite3-dev \
-        libtinfo-dev \
-        libgmp-dev \
-        make \
-        netbase \
-        openssh-client \
-        xz-utils \
-        zlib1g-dev \
-		libnuma-dev libgmp10 libssl-dev liblzma-dev libbz2-dev wget lsb-release software-properties-common apt-transport-https gcc autoconf automake build-essential gzip patchelf tree \
-		llvm-11 clang-11 && \
-    rm -rf /var/lib/apt/lists/*
-
-RUN update_opt.sh 11 1
-
-ARG GHCUP_VERSION=0.1.17.8
-ARG GPG_KEY=7784930957807690A66EBDBE3786C5262ECB4A3F
-
-# install ghcup
-RUN gpg --batch --keyserver keys.openpgp.org --recv-keys $GPG_KEY && \
-    curl -sSfL -O https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/armv7-linux-ghcup-$GHCUP_VERSION && \
-    curl -sSfL -O https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/SHA256SUMS && \
-    curl -sSfL -O https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/SHA256SUMS.sig && \
-    gpg --verify SHA256SUMS.sig SHA256SUMS && \
-    sha256sum -c --ignore-missing SHA256SUMS && \
-    mv armv7-linux-ghcup-$GHCUP_VERSION /usr/bin/ghcup && \
-    chmod +x /usr/bin/ghcup && \
-    rm -rf SHA256SUMS SHA256SUMS.sig
-
-ARG GHC=8.10.7
-ARG CABAL_INSTALL=3.6.2.0
-ARG STACK=2.9.1
-
-ENV GHCUP_CURL_OPTS="--silent"
-ENV NO_COLOR=1
-
-# install haskell toolchain
-RUN ghcup config set gpg-setting GPGStrict && \
-	ghcup --verbose install ghc   --isolate=/usr     --force ${GHC} && \
-	ghcup --verbose install cabal --isolate=/usr/bin --force ${CABAL_INSTALL} && \
-	ghcup gc -s -c -t
-
-ENV PATH /root/.cabal/bin:/root/.ghcup/bin:/root/.local/bin:$PATH
-
-CMD ["ghci"]

docker/arm64v8/Dockerfile

@@ -54,7 +54,10 @@ ENV NO_COLOR=1
 RUN ghcup config set gpg-setting GPGStrict && \
 	ghcup --verbose install ghc   --isolate=/usr     --force ${GHC} && \
 	ghcup --verbose install cabal --isolate=/usr/bin --force ${CABAL_INSTALL} && \
-	ghcup gc -s -c -t
+	find "/usr/lib/ghc-${GHC}/" \( -name "*_p.a" -o -name "*.p_hi" \) -type f -delete && \
+	rm -r "/usr/share/doc/ghc-${GHC}" && \
+	rm -rf /tmp/ghcup* && \
+	ghcup gc -p -s -c -t
 
 ENV PATH /root/.cabal/bin:/root/.ghcup/bin:/root/.local/bin:$PATH
 

docker/arm64v8/buster/Dockerfile

@@ -1,61 +0,0 @@
-FROM arm64v8/debian:10
-
-ENV LANG C.UTF-8
-ENV DEBIAN_FRONTEND=noninteractive
-ENV TZ=Asia/Singapore
-
-COPY update_opt.sh /usr/bin/update_opt.sh
-RUN chmod +x /usr/bin/update_opt.sh
-
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        ca-certificates \
-        curl \
-        dirmngr \
-        g++ \
-        git \
-        gnupg \
-        libsqlite3-dev \
-        libtinfo-dev \
-        libgmp-dev \
-        make \
-        netbase \
-        openssh-client \
-        xz-utils \
-        zlib1g-dev \
-		libnuma-dev libgmp10 libssl-dev liblzma-dev libbz2-dev wget lsb-release software-properties-common apt-transport-https gcc autoconf automake build-essential gzip patchelf tree \
-		llvm-11 clang-11 && \
-    rm -rf /var/lib/apt/lists/*
-
-RUN update_opt.sh 11 1
-
-ARG GHCUP_VERSION=0.1.18.0
-ARG GPG_KEY=7784930957807690A66EBDBE3786C5262ECB4A3F
-
-# install ghcup
-RUN gpg --batch --keyserver keys.openpgp.org --recv-keys $GPG_KEY && \
-    curl -sSfL -O https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/aarch64-linux-ghcup-$GHCUP_VERSION && \
-    curl -sSfL -O https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/SHA256SUMS && \
-    curl -sSfL -O https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/SHA256SUMS.sig && \
-    gpg --verify SHA256SUMS.sig SHA256SUMS && \
-    sha256sum -c --ignore-missing SHA256SUMS && \
-    mv aarch64-linux-ghcup-$GHCUP_VERSION /usr/bin/ghcup && \
-    chmod +x /usr/bin/ghcup && \
-    rm -rf SHA256SUMS SHA256SUMS.sig
-
-ARG GHC=8.10.7
-ARG CABAL_INSTALL=3.6.2.0
-ARG STACK=2.9.1
-
-ENV GHCUP_CURL_OPTS="--silent"
-ENV NO_COLOR=1
-
-# install haskell toolchain
-RUN ghcup config set gpg-setting GPGStrict && \
-	ghcup --verbose install ghc   --isolate=/usr     --force ${GHC} && \
-	ghcup --verbose install cabal --isolate=/usr/bin --force ${CABAL_INSTALL} && \
-	ghcup gc -s -c -t
-
-ENV PATH /root/.cabal/bin:/root/.ghcup/bin:/root/.local/bin:$PATH
-
-CMD ["ghci"]

docker/arm64v8/buster/update_opt.sh

@@ -1,36 +0,0 @@
-#!/bin/bash
-# update_alternatives.sh
-
-update_alternatives() {
-    local version=${1}
-    local priority=${2}
-    local master=${3}
-    local slaves=${4}
-    local path=${5}
-    local cmdln
-
-    cmdln="--verbose --install ${path}${master} ${master} ${path}${master}-${version} ${priority}"
-    for slave in ${slaves}; do
-        cmdln="${cmdln} --slave ${path}${slave} ${slave} ${path}${slave}-${version}"
-    done
-    update-alternatives ${cmdln}
-}
-
-if [[ ${#} -ne 2 ]]; then
-    echo usage: "${0}" clang_version priority
-    exit 1
-fi
-
-version=${1}
-priority=${2}
-path="/usr/bin/"
-
-master="llvm-config"
-slaves="llvm-addr2line llvm-ar llvm-as llvm-bcanalyzer llvm-bitcode-strip llvm-cat llvm-cfi-verify llvm-cov llvm-c-test llvm-cvtres llvm-cxxdump llvm-cxxfilt llvm-cxxmap llvm-debuginfod llvm-debuginfod-find llvm-diff llvm-dis llvm-dlltool llvm-dwarfdump llvm-dwarfutil llvm-dwp llvm-exegesis llvm-extract llvm-gsymutil llvm-ifs llvm-install-name-tool llvm-jitlink llvm-jitlink-executor llvm-lib llvm-libtool-darwin llvm-link llvm-lipo llvm-lto llvm-lto2 llvm-mc llvm-mca llvm-ml llvm-modextract llvm-mt llvm-nm llvm-objcopy llvm-objdump llvm-omp-device-info llvm-opt-report llvm-otool llvm-pdbutil llvm-PerfectShuffle llvm-profdata llvm-profgen llvm-ranlib llvm-rc llvm-readelf llvm-readobj llvm-reduce llvm-remark-size-diff llvm-rtdyld llvm-sim llvm-size llvm-split llvm-stress llvm-strings llvm-strip llvm-symbolizer llvm-tapi-diff llvm-tblgen llvm-tli-checker llvm-undname llvm-windres llvm-xray"
-
-update_alternatives "${version}" "${priority}" "${master}" "${slaves}" "${path}"
-
-master="clang"
-slaves="analyze-build asan_symbolize bugpoint c-index-test clang++ clang-apply-replacements clang-change-namespace clang-check clang-cl clang-cpp clangd clang-doc clang-extdef-mapping clang-format clang-format-diff clang-include-fixer clang-linker-wrapper clang-move clang-nvlink-wrapper clang-offload-bundler clang-offload-packager clang-offload-wrapper clang-pseudo clang-query clang-refactor clang-rename clang-reorder-fields clang-repl clang-scan-deps clang-tidy count diagtool dsymutil FileCheck find-all-symbols git-clang-format hmaptool hwasan_symbolize intercept-build ld64.lld ld.lld llc lld lldb lldb-argdumper lldb-instr lldb-server lldb-vscode lld-link lli lli-child-target modularize not obj2yaml opt pp-trace run-clang-tidy sancov sanstats scan-build scan-build-py scan-view split-file UnicodeNameMappingGenerator verify-uselistorder wasm-ld yaml2obj yaml-bench"
-
-update_alternatives "${version}" "${priority}" "${master}" "${slaves}" "${path}"

docker/arm64v8/focal/update_opt.sh

@@ -1,36 +0,0 @@
-#!/bin/bash
-# update_alternatives.sh
-
-update_alternatives() {
-    local version=${1}
-    local priority=${2}
-    local master=${3}
-    local slaves=${4}
-    local path=${5}
-    local cmdln
-
-    cmdln="--verbose --install ${path}${master} ${master} ${path}${master}-${version} ${priority}"
-    for slave in ${slaves}; do
-        cmdln="${cmdln} --slave ${path}${slave} ${slave} ${path}${slave}-${version}"
-    done
-    update-alternatives ${cmdln}
-}
-
-if [[ ${#} -ne 2 ]]; then
-    echo usage: "${0}" clang_version priority
-    exit 1
-fi
-
-version=${1}
-priority=${2}
-path="/usr/bin/"
-
-master="llvm-config"
-slaves="llvm-addr2line llvm-ar llvm-as llvm-bcanalyzer llvm-bitcode-strip llvm-cat llvm-cfi-verify llvm-cov llvm-c-test llvm-cvtres llvm-cxxdump llvm-cxxfilt llvm-cxxmap llvm-debuginfod llvm-debuginfod-find llvm-diff llvm-dis llvm-dlltool llvm-dwarfdump llvm-dwarfutil llvm-dwp llvm-exegesis llvm-extract llvm-gsymutil llvm-ifs llvm-install-name-tool llvm-jitlink llvm-jitlink-executor llvm-lib llvm-libtool-darwin llvm-link llvm-lipo llvm-lto llvm-lto2 llvm-mc llvm-mca llvm-ml llvm-modextract llvm-mt llvm-nm llvm-objcopy llvm-objdump llvm-omp-device-info llvm-opt-report llvm-otool llvm-pdbutil llvm-PerfectShuffle llvm-profdata llvm-profgen llvm-ranlib llvm-rc llvm-readelf llvm-readobj llvm-reduce llvm-remark-size-diff llvm-rtdyld llvm-sim llvm-size llvm-split llvm-stress llvm-strings llvm-strip llvm-symbolizer llvm-tapi-diff llvm-tblgen llvm-tli-checker llvm-undname llvm-windres llvm-xray"
-
-update_alternatives "${version}" "${priority}" "${master}" "${slaves}" "${path}"
-
-master="clang"
-slaves="analyze-build asan_symbolize bugpoint c-index-test clang++ clang-apply-replacements clang-change-namespace clang-check clang-cl clang-cpp clangd clang-doc clang-extdef-mapping clang-format clang-format-diff clang-include-fixer clang-linker-wrapper clang-move clang-nvlink-wrapper clang-offload-bundler clang-offload-packager clang-offload-wrapper clang-pseudo clang-query clang-refactor clang-rename clang-reorder-fields clang-repl clang-scan-deps clang-tidy count diagtool dsymutil FileCheck find-all-symbols git-clang-format hmaptool hwasan_symbolize intercept-build ld64.lld ld.lld llc lld lldb lldb-argdumper lldb-instr lldb-server lldb-vscode lld-link lli lli-child-target modularize not obj2yaml opt pp-trace run-clang-tidy sancov sanstats scan-build scan-build-py scan-view split-file UnicodeNameMappingGenerator verify-uselistorder wasm-ld yaml2obj yaml-bench"
-
-update_alternatives "${version}" "${priority}" "${master}" "${slaves}" "${path}"

lib/GHCup/Errors.hs

@@ -35,6 +35,8 @@ import           URI.ByteString
 
 import qualified Data.Map.Strict               as M
 import qualified Data.Text                     as T
+import qualified Data.Text.Encoding            as E
+import qualified Data.Text.Encoding.Error      as E
 import           Data.Data (Proxy(..))
 
 
@@ -82,6 +84,7 @@ allHFError = unlines allErrors
     , let proxy = Proxy :: Proxy HadrianNotFound in format proxy
     , let proxy = Proxy :: Proxy ToolShadowed in format proxy
     , let proxy = Proxy :: Proxy ContentLengthError in format proxy
+    , let proxy = Proxy :: Proxy DuplicateReleaseChannel in format proxy
     , ""
     , "# high level errors (4000+)"
     , let proxy = Proxy :: Proxy DownloadFailed in format proxy
@@ -640,6 +643,19 @@ instance HFErrorProject ContentLengthError where
   eBase _ = 340
   eDesc _ = "File content length verification failed"
 
+data DuplicateReleaseChannel = DuplicateReleaseChannel URI
+  deriving Show
+
+instance HFErrorProject DuplicateReleaseChannel where
+  eBase _ = 350
+  eDesc _ = "Duplicate release channel detected when adding URI.\nGiving up. You can use '--force' to remove and append the duplicate URI (this may change order/semantics)."
+
+instance Pretty DuplicateReleaseChannel where
+  pPrint (DuplicateReleaseChannel uri) =
+    text $ "Duplicate release channel detected when adding: \n  "
+      <> (T.unpack . E.decodeUtf8With E.lenientDecode . serializeURIRef') uri
+      <> "\nGiving up. You can use '--force' to remove and append the duplicate URI (this may change order/semantics)."
+
     -------------------------
     --[ High-level errors ]--
     -------------------------

lib/GHCup/Types.hs

@@ -66,7 +66,7 @@ data GHCupInfo = GHCupInfo
   , _ghcupDownloads   :: GHCupDownloads
   , _globalTools      :: Map GlobalTool DownloadInfo
   }
-  deriving (Show, GHC.Generic)
+  deriving (Show, GHC.Generic, Eq)
 
 instance NFData GHCupInfo
 
@@ -87,7 +87,7 @@ data Requirements = Requirements
   { _distroPKGs :: [Text]
   , _notes      :: Text
   }
-  deriving (Show, GHC.Generic)
+  deriving (Show, GHC.Generic, Eq)
 
 instance NFData Requirements