Pad and use hyperlinks

Fixes #434

.github/scripts/common.sh

@@ -87,39 +87,29 @@ download_cabal_cache() {
 	cd /tmp
 	case "${RUNNER_OS}" in
 		"Linux")
-			case "${DISTRO}" in
+			case "${ARCH}" in
-				"Alpine")
+				"32") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/i386-linux-cabal-cache
-					case "${ARCH}" in
-						"32") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/i386-linux-alpine-cabal-cache-1.0.5.1
-							;;
-						"64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/x86_64-linux-alpine-cabal-cache-1.0.5.1
-							;;
-					esac
 					;;
-				*)
+				"64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/x86_64-linux-cabal-cache
-					case "${ARCH}" in
+					;;
-						"64") url=https://github.com/haskell-works/cabal-cache/releases/download/v1.0.5.1/cabal-cache-x86_64-linux.gz
+				"ARM64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/aarch64-linux-cabal-cache
-							;;
+					;;
-						"ARM64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/aarch64-linux-cabal-cache-1.0.5.1
+				"ARM") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/armv7-linux-cabal-cache
-							;;
-						"ARM") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/armv7-linux-cabal-cache-1.0.5.1
-							;;
-					esac
 					;;
 			esac
 			;;
 		"FreeBSD")
-			url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/x86_64-freebsd-cabal-cache-1.0.5.1
+			url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/x86_64-portbld-freebsd-cabal-cache
 			;;
 		"Windows")
 			exe=".exe"
-			url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/x86_64-mingw64-cabal-cache-1.0.5.1.exe
+			url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/x86_64-mingw64-cabal-cache
 			;;
 		"macOS")
 			case "${ARCH}" in
-				"ARM64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/aarch64-apple-darwin-cabal-cache-1.0.5.1
+				"ARM64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/aarch64-apple-darwin-cabal-cache
 					;;
-				"64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/1.0.5.1/x86_64-apple-darwin-cabal-cache-1.0.5.1
+				"64") url=https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal-cache/experimental4/x86_64-apple-darwin-cabal-cache
 					;;
 			esac
 			;;
@@ -134,8 +124,9 @@ download_cabal_cache() {
 				curl -o cabal-cache${exe} -L "${url}"
 				;;
 		esac
-		chmod +x cabal-cache${exe}
+		sha_sum cabal-cache${exe}
-		cp "cabal-cache${exe}" "${dest}${exe}"
+		mv "cabal-cache${exe}" "${dest}${exe}"
+		chmod +x "${dest}${exe}"
 	fi
     )
 }
@@ -167,13 +158,15 @@ install_ghcup() {
 strip_binary() {
 	(
 	set -e
-	binary=$1
+	local binary=$1
-	if [ "${RUNNER_OS}" = "macOS" ] ; then
+	case "$(uname -s)" in
-		strip "${binary}"
+		"Darwin"|"darwin")
-	else
+			;;
-		if [ "${RUNNER_OS}" != "Windows" ] ; then
+		MSYS_*|MINGW*)
+			;;
+		*)
 			strip -s "${binary}"
-		fi
+		   ;;
-	fi
+   esac
 	)
 }

.github/workflows/release.yaml

@@ -102,7 +102,7 @@ jobs:
       - uses: docker://arm64v8/ubuntu:focal
         name: Cleanup (aarch64 linux)
         with:
-          args: rm -rf .ghcup/ cabal/ dist-newstyle/ out/
+          args: "find . -mindepth 1 -maxdepth 1 -exec rm -rf -- {} +"
 
       - name: git config
         run: |
@@ -272,6 +272,14 @@ jobs:
           DISTRO: ${{ matrix.DISTRO }}
           APT_GET: "sudo apt-get"
 
+      - if: failure()
+        name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: testfiles
+          path: |
+            ./test/golden/unix/GHCupInfo*json
+
   test-arm:
     name: Test ARM
     needs: "build-arm"
@@ -297,7 +305,7 @@ jobs:
       - uses: docker://arm64v8/ubuntu:focal
         name: Cleanup (aarch64 linux)
         with:
-          args: rm -rf .ghcup/ cabal/ dist-newstyle/ out/
+          args: "find . -mindepth 1 -maxdepth 1 -exec rm -rf -- {} +"
 
       - name: Checkout code
         uses: actions/checkout@v3
@@ -311,9 +319,9 @@ jobs:
 
       - if: matrix.ARCH == 'ARM'
         uses: docker://hasufell/arm32v7-ubuntu-haskell:focal
-        name: Run build (armv7 linux)
+        name: Run test (armv7 linux)
         with:
-          run: sh .github/scripts/test.sh
+          args: sh .github/scripts/test.sh
         env:
           ARTIFACT: ${{ matrix.ARTIFACT }}
           ARCH: ${{ matrix.ARCH }}
@@ -322,15 +330,23 @@ jobs:
 
       - if: matrix.ARCH == 'ARM64'
         uses: docker://hasufell/arm64v8-ubuntu-haskell:focal
-        name: Run build (aarch64 linux)
+        name: Run test (aarch64 linux)
         with:
-          run: sh .github/scripts/test.sh
+          args: sh .github/scripts/test.sh
         env:
           ARTIFACT: ${{ matrix.ARTIFACT }}
           ARCH: ${{ matrix.ARCH }}
           GHC_VER: ${{ matrix.GHC_VER }}
           DISTRO: Ubuntu
 
+      - if: failure()
+        name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: testfiles
+          path: |
+            ./test/golden/unix/GHCupInfo*json
+
   test-macwin:
     name: Test Mac/Win
     needs: "build-macwin"
@@ -377,6 +393,22 @@ jobs:
           GHC_VER: ${{ matrix.GHC_VER }}
           DISTRO: ${{ matrix.DISTRO }}
           HOMEBREW_CHANGE_ARCH_TO_ARM: 1
+
+      - if: failure() && runner.os == 'Windows'
+        name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: testfiles
+          path: |
+            ./test/golden/windows/GHCupInfo*json
+
+      - if: failure() && runner.os != 'Windows'
+        name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: testfiles
+          path: |
+            ./test/golden/unix/GHCupInfo*json
   hls:
     name: hls
     needs: build-linux

app/ghcup/BrickMain.hs

@@ -13,6 +13,7 @@ import           GHCup.Errors
 import           GHCup.Types.Optics ( getDirs )
 import           GHCup.Types         hiding ( LeanAppState(..) )
 import           GHCup.Utils
+import           GHCup.OptParse.Common (logGHCPostRm)
 import           GHCup.Prelude ( decUTF8Safe )
 import           GHCup.Prelude.File
 import           GHCup.Prelude.Logger
@@ -433,6 +434,7 @@ install' _ (_, ListResult {..}) = do
               , BuildFailed
               , TagNotFound
               , DigestError
+              , ContentLengthError
               , GPGError
               , DownloadFailed
               , DirNotEmpty
@@ -485,7 +487,7 @@ install' _ (_, ListResult {..}) = do
             pure $ Right ()
           VLeft  (V (AlreadyInstalled _ _)) -> pure $ Right ()
           VLeft (V NoUpdate) -> pure $ Right ()
-          VLeft e -> pure $ Left $ prettyShow e <> "\n"
+          VLeft e -> pure $ Left $ prettyHFError e <> "\n"
             <> "Also check the logs in ~/.ghcup/logs"
 
 
@@ -522,7 +524,7 @@ set' bs input@(_, ListResult {..}) = do
                       logInfo "Setting now..."
                       set' bs input
 
-                PromptNo -> pure $ Left (prettyShow e)
+                PromptNo -> pure $ Left (prettyHFError e)
               where
                 userPrompt = L.toStrict . B.toLazyText . B.fromString $
                   "This Version of "
@@ -530,7 +532,7 @@ set' bs input@(_, ListResult {..}) = do
                   <> " you are trying to set is not installed.\n"
                   <> "Would you like to install it first? [Y/N]: "
 
-            _ -> pure $ Left (prettyShow e)
+            _ -> pure $ Left (prettyHFError e)
 
 
 
@@ -554,10 +556,11 @@ del' _ (_, ListResult {..}) = do
     )
     >>= \case
           VRight vi -> do
+            logGHCPostRm (mkTVer lVer)
             forM_ (_viPostRemove =<< vi) $ \msg ->
               logInfo msg
             pure $ Right ()
-          VLeft  e -> pure $ Left (prettyShow e)
+          VLeft  e -> pure $ Left (prettyHFError e)
 
 
 changelog' :: (MonadReader AppState m, MonadIO m)
@@ -577,7 +580,7 @@ changelog' _ (_, ListResult {..}) = do
             Windows -> "start"
       exec cmd [T.unpack $ decUTF8Safe $ serializeURIRef' uri] Nothing Nothing >>= \case
         Right _ -> pure $ Right ()
-        Left  e -> pure $ Left $ prettyShow e
+        Left  e -> pure $ Left $ prettyHFError e
 
 
 settings' :: IORef AppState
@@ -630,12 +633,12 @@ getGHCupInfo = do
 
   r <-
     flip runReaderT settings
-    . runE @'[DigestError, GPGError, JSONError , DownloadFailed , FileDoesNotExistError]
+    . runE @'[DigestError, ContentLengthError, GPGError, JSONError , DownloadFailed , FileDoesNotExistError]
     $ liftE getDownloadsF
 
   case r of
     VRight a -> pure $ Right a
-    VLeft  e -> pure $ Left (prettyShow e)
+    VLeft  e -> pure $ Left (prettyHFError e)
 
 
 getAppData :: Maybe GHCupInfo

app/ghcup/GHCup/OptParse.hs

@@ -67,13 +67,13 @@ import           URI.ByteString
 import qualified Data.ByteString.UTF8          as UTF8
 
 
-
 data Options = Options
   {
   -- global options
     optVerbose     :: Maybe Bool
   , optCache       :: Maybe Bool
   , optMetaCache   :: Maybe Integer
+  , optMetaMode    :: Maybe MetaMode
   , optPlatform    :: Maybe PlatformRequest
   , optUrlSource   :: Maybe URI
   , optNoVerify    :: Maybe Bool
@@ -108,6 +108,7 @@ data Command
   | Prefetch PrefetchCommand
   | GC GCOptions
   | Run RunOptions
+  | PrintAppErrors
 
 
 
@@ -116,7 +117,8 @@ opts =
   Options
     <$> 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 auto (long "metadata-caching" <> metavar "SEC" <> help "How long the yaml metadata caching interval is (in seconds), 0 to disable"))
+    <*> optional (option auto (long "metadata-fetching-mode" <> metavar "<Strict|Lax>" <> help "Whether to fail on metadata download failure (Strict) or fall back to cached version (Lax (default))"))
     <*> optional
       (option
         (eitherReader platformParser)
@@ -340,3 +342,10 @@ com =
            <> commandGroup "Nuclear Commands:"
            <> hidden
           )
+     <|> subparser
+          (command
+              "print-app-errors"
+               (info (pure PrintAppErrors <**> helper)
+                     (progDesc ""))
+           <> internal
+          )

app/ghcup/GHCup/OptParse/ChangeLog.hs

@@ -12,6 +12,7 @@ module GHCup.OptParse.ChangeLog where
 
 
 import           GHCup.Types
+import           GHCup.Errors
 import           GHCup.OptParse.Common
 import           GHCup.Prelude
 import           GHCup.Prelude.Logger
@@ -148,6 +149,6 @@ changelog ChangeLogOptions{..} runAppState runLogger = do
                  Nothing
               >>= \case
                     Right _ -> pure ExitSuccess
-                    Left  e -> logError (T.pack $ prettyShow e)
+                    Left  e -> logError (T.pack $ prettyHFError e)
                       >> pure (ExitFailure 13)
         else liftIO $ putStrLn uri' >> pure ExitSuccess

app/ghcup/GHCup/OptParse/Common.hs

@@ -25,6 +25,7 @@ import           Control.DeepSeq
 import           Control.Concurrent
 import           Control.Concurrent.Async
 import           Control.Exception.Safe
+import           Control.Monad.Identity (Identity(..))
 #if !MIN_VERSION_base(4,13,0)
 import           Control.Monad.Fail             ( MonadFail )
 #endif
@@ -64,6 +65,7 @@ import qualified Text.Megaparsec               as MP
 import qualified System.FilePath.Posix         as FP
 import GHCup.Version
 import Control.Exception (evaluate)
+import qualified Cabal.Config            as CC
 
 
     -------------
@@ -789,3 +791,12 @@ checkForUpdates = do
   pure $ catMaybes (ghcup:otherTools)
  where
   forMM a f = fmap join $ forM a f
+
+
+logGHCPostRm :: (MonadReader env m, HasLog env, MonadIO m) => GHCTargetVersion -> m ()
+logGHCPostRm ghcVer = do
+  cabalStore <- liftIO $ handleIO (\_ -> if isWindows then pure "C:\\cabal\\store" else pure "~/.cabal/store")
+    (runIdentity . CC.cfgStoreDir <$> CC.readConfig)
+  let storeGhcDir = cabalStore </> ("ghc-" <> T.unpack (prettyVer $ _tvVersion ghcVer))
+  logInfo $ T.pack $ "After removing GHC you might also want to clean up your cabal store at: " <> storeGhcDir
+

app/ghcup/GHCup/OptParse/Compile.hs

@@ -40,7 +40,6 @@ import           Options.Applicative     hiding ( style )
 import           Options.Applicative.Help.Pretty ( text )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import           URI.ByteString          hiding ( uriParser )
 import qualified Data.Text                     as T
@@ -420,6 +419,7 @@ hlsCompileOpts =
 type GHCEffects = '[ AlreadyInstalled
                   , BuildFailed
                   , DigestError
+                  , ContentLengthError
                   , GPGError
                   , DownloadFailed
                   , GHCupSetError
@@ -443,6 +443,7 @@ type GHCEffects = '[ AlreadyInstalled
 type HLSEffects = '[ AlreadyInstalled
                   , BuildFailed
                   , DigestError
+                  , ContentLengthError
                   , GPGError
                   , DownloadFailed
                   , GHCupSetError
@@ -544,14 +545,14 @@ compile compileCommand settings Dirs{..} runAppState runLogger = do
                 pure ExitSuccess
               VLeft err@(V (BuildFailed tmpdir _)) -> do
                 case keepDirs settings of
-                  Never -> runLogger $ logError $ T.pack $ prettyShow err
+                  Never -> runLogger $ logError $ T.pack $ prettyHFError err
-                  _ -> runLogger (logError $ T.pack (prettyShow err) <> "\n" <>
+                  _ -> runLogger (logError $ T.pack (prettyHFError err) <> "\n" <>
                         "Check the logs at " <> T.pack (fromGHCupPath logsDir) <> " and the build directory "
                         <> T.pack tmpdir <> " for more clues." <> "\n" <>
                         "Make sure to clean up " <> T.pack tmpdir <> " afterwards.")
                 pure $ ExitFailure 9
               VLeft e -> do
-                runLogger $ logError $ T.pack $ prettyShow e
+                runLogger $ logError $ T.pack $ prettyHFError e
                 pure $ ExitFailure 9
     (CompileGHC GHCCompileOptions { hadrian = True, crossTarget = Just _ }) -> do
       runLogger $ logError "Hadrian cross compile support is not yet implemented!"
@@ -606,12 +607,12 @@ compile compileCommand settings Dirs{..} runAppState runLogger = do
                 pure $ ExitFailure 3
               VLeft err@(V (BuildFailed tmpdir _)) -> do
                 case keepDirs settings of
-                  Never -> runLogger $ logError $ T.pack $ prettyShow err
+                  Never -> runLogger $ logError $ T.pack $ prettyHFError err
-                  _ -> runLogger (logError $ T.pack (prettyShow err) <> "\n" <>
+                  _ -> runLogger (logError $ T.pack (prettyHFError err) <> "\n" <>
                         "Check the logs at " <> T.pack (fromGHCupPath logsDir) <> " and the build directory "
                         <> T.pack tmpdir <> " for more clues." <> "\n" <>
                         "Make sure to clean up " <> T.pack tmpdir <> " afterwards.")
                 pure $ ExitFailure 9
               VLeft e -> do
-                runLogger $ logError $ T.pack $ prettyShow e
+                runLogger $ logError $ T.pack $ prettyHFError e
                 pure $ ExitFailure 9

app/ghcup/GHCup/OptParse/Config.hs

@@ -59,7 +59,7 @@ data ConfigCommand
     --[ Parsers ]--
     ---------------
 
-          
+
 configP :: Parser ConfigCommand
 configP = subparser
       (  command "init" initP
@@ -124,6 +124,7 @@ updateSettings :: UserSettings -> Settings -> Settings
 updateSettings UserSettings{..} Settings{..} =
    let cache'      = fromMaybe cache uCache
        metaCache'  = fromMaybe metaCache uMetaCache
+       metaMode'   = fromMaybe metaMode uMetaMode
        noVerify'   = fromMaybe noVerify uNoVerify
        keepDirs'   = fromMaybe keepDirs uKeepDirs
        downloader' = fromMaybe downloader uDownloader
@@ -132,7 +133,7 @@ updateSettings UserSettings{..} Settings{..} =
        noNetwork'  = fromMaybe noNetwork uNoNetwork
        gpgSetting' = fromMaybe gpgSetting uGPGSetting
        platformOverride' = uPlatformOverride <|> platformOverride
-   in Settings cache' metaCache' noVerify' keepDirs' downloader' verbose' urlSource' noNetwork' gpgSetting' noColor platformOverride'
+   in Settings cache' metaCache' metaMode' noVerify' keepDirs' downloader' verbose' urlSource' noNetwork' gpgSetting' noColor platformOverride'
 
 
 
@@ -188,9 +189,15 @@ config configCommand settings keybindings runLogger = case configCommand of
       AddSource xs -> do
         doConfig (defaultUserSettings { uUrlSource = Just $ AddSource (xs <> [Right uri]) })
         pure ExitSuccess
-      _ -> do
+      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]) })
+        pure ExitSuccess
 
  where
   doConfig :: MonadIO m => UserSettings -> m ()

app/ghcup/GHCup/OptParse/DInfo.hs

@@ -115,5 +115,5 @@ dinfo runAppState runLogger = do
             liftIO $ putStrLn $ prettyDebugInfo di
             pure ExitSuccess
           VLeft e -> do
-            runLogger $ logError $ T.pack $ prettyShow e
+            runLogger $ logError $ T.pack $ prettyHFError e
             pure $ ExitFailure 8

app/ghcup/GHCup/OptParse/GC.hs

@@ -27,7 +27,6 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -139,5 +138,5 @@ gc GCOptions{..} runAppState runLogger = runGC runAppState (do
             VRight _ -> do
                   pure ExitSuccess
             VLeft e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 27

app/ghcup/GHCup/OptParse/Install.hs

@@ -38,7 +38,6 @@ import           Options.Applicative     hiding ( style )
 import           Options.Applicative.Help.Pretty ( text )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 import           URI.ByteString          hiding ( uriParser )
 
 import qualified Data.Text                     as T
@@ -243,6 +242,7 @@ type InstallEffects = '[ AlreadyInstalled
                        , BuildFailed
                        , TagNotFound
                        , DigestError
+                       , ContentLengthError
                        , GPGError
                        , DownloadFailed
                        , TarDirDoesNotExist
@@ -271,6 +271,7 @@ type InstallGHCEffects = '[ AlreadyInstalled
                           , BuildFailed
                           , CopyError
                           , DigestError
+                          , ContentLengthError
                           , DirNotEmpty
                           , DownloadFailed
                           , FileAlreadyExistsError
@@ -332,7 +333,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
          runInstGHC s'{ settings = settings {noVerify = True}} $ do
            (v, vi) <- liftE $ fromVersion instVer GHC
            liftE $ runBothE' (installGHCBindist
-                       (DownloadInfo uri (Just $ RegexDir "ghc-.*") "")
+                       (DownloadInfo uri (Just $ RegexDir "ghc-.*") "" Nothing)
                        (_tvVersion v)
                        (maybe GHCupInternal IsolateDir isolateDir)
                        forceInstall
@@ -349,10 +350,10 @@ install installCommand settings getAppState' runLogger = case installCommand of
                 pure ExitSuccess
 
               VLeft e@(V (AlreadyInstalled _ _)) -> do
-                runLogger $ logWarn $ T.pack $ prettyShow e
+                runLogger $ logWarn $ T.pack $ prettyHFError e
                 pure ExitSuccess
               VLeft e@(V (AlreadyInstalled _ _)) -> do
-                runLogger $ logWarn $ T.pack $ prettyShow e
+                runLogger $ logWarn $ T.pack $ prettyHFError e
                 pure ExitSuccess
 
               VLeft (V (DirNotEmpty fp)) -> do
@@ -366,22 +367,22 @@ install installCommand settings getAppState' runLogger = case installCommand of
 
               VLeft err@(V (BuildFailed tmpdir _)) -> do
                 case keepDirs settings of
-                  Never -> runLogger (logError $ T.pack $ prettyShow err)
+                  Never -> runLogger (logError $ T.pack $ prettyHFError err)
-                  _ -> runLogger (logError $ T.pack (prettyShow err) <> "\n" <>
+                  _ -> runLogger (logError $ T.pack (prettyHFError err) <> "\n" <>
                     "Check the logs at " <> T.pack (fromGHCupPath logsDir) <> " and the build directory " <> T.pack tmpdir <> " for more clues." <> "\n" <>
                     "Make sure to clean up " <> T.pack tmpdir <> " afterwards.")
                 pure $ ExitFailure 3
               VLeft err@(V (BuildFailed tmpdir _)) -> do
                 case keepDirs settings of
-                  Never -> runLogger (logError $ T.pack $ prettyShow err)
+                  Never -> runLogger (logError $ T.pack $ prettyHFError err)
-                  _ -> runLogger (logError $ T.pack (prettyShow err) <> "\n" <>
+                  _ -> runLogger (logError $ T.pack (prettyHFError err) <> "\n" <>
                     "Check the logs at " <> T.pack (fromGHCupPath logsDir) <> " and the build directory " <> T.pack tmpdir <> " for more clues." <> "\n" <>
                     "Make sure to clean up " <> T.pack tmpdir <> " afterwards.")
                 pure $ ExitFailure 3
 
               VLeft e -> do
                 runLogger $ do
-                  logError $ T.pack $ prettyShow e
+                  logError $ T.pack $ prettyHFError e
                   logError $ "Also check the logs in " <> T.pack (fromGHCupPath logsDir)
                 pure $ ExitFailure 3
 
@@ -402,7 +403,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
          runInstTool s'{ settings = settings { noVerify = True}} $ do
            (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Cabal
            liftE $ runBothE' (installCabalBindist
-                                      (DownloadInfo uri Nothing "")
+                                      (DownloadInfo uri Nothing "" Nothing)
                                       v
                                       (maybe GHCupInternal IsolateDir isolateDir)
                                       forceInstall
@@ -416,14 +417,14 @@ install installCommand settings getAppState' runLogger = case installCommand of
                 runLogger $ logInfo msg
               pure ExitSuccess
             VLeft e@(V (AlreadyInstalled _ _)) -> do
-              runLogger $ logWarn $ T.pack $ prettyShow e
+              runLogger $ logWarn $ T.pack $ prettyHFError e
               pure ExitSuccess
             VLeft (V (FileAlreadyExistsError fp)) -> do
               runLogger $ logWarn $
                 "File " <> T.pack fp <> " already exists. Use 'ghcup install cabal --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
               pure $ ExitFailure 3
             VLeft e@(V (AlreadyInstalled _ _)) -> do
-              runLogger $ logWarn $ T.pack $ prettyShow e
+              runLogger $ logWarn $ T.pack $ prettyHFError e
               pure ExitSuccess
             VLeft (V (FileAlreadyExistsError fp)) -> do
               runLogger $ logWarn $
@@ -431,7 +432,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
               pure $ ExitFailure 3
             VLeft e -> do
               runLogger $ do
-                logError $ T.pack $ prettyShow e
+                logError $ T.pack $ prettyHFError e
                 logError $ "Also check the logs in " <> T.pack (fromGHCupPath logsDir)
               pure $ ExitFailure 4
 
@@ -452,7 +453,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
            (_tvVersion -> v, vi) <- liftE $ fromVersion instVer HLS
            -- TODO: support legacy
            liftE $ runBothE' (installHLSBindist
-                                      (DownloadInfo uri (Just $ RegexDir "haskell-language-server-*") "")
+                                      (DownloadInfo uri (if isWindows then Nothing else Just (RegexDir "haskell-language-server-*")) "" Nothing)
                                       v
                                       (maybe GHCupInternal IsolateDir isolateDir)
                                       forceInstall
@@ -466,14 +467,14 @@ install installCommand settings getAppState' runLogger = case installCommand of
                 runLogger $ logInfo msg
               pure ExitSuccess
             VLeft e@(V (AlreadyInstalled _ _)) -> do
-              runLogger $ logWarn $ T.pack $ prettyShow e
+              runLogger $ logWarn $ T.pack $ prettyHFError e
               pure ExitSuccess
             VLeft (V (FileAlreadyExistsError fp)) -> do
               runLogger $ logWarn $
                 "File " <> T.pack fp <> " already exists. Use 'ghcup install hls --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
               pure $ ExitFailure 3
             VLeft e@(V (AlreadyInstalled _ _)) -> do
-              runLogger $ logWarn $ T.pack $ prettyShow e
+              runLogger $ logWarn $ T.pack $ prettyHFError e
               pure ExitSuccess
             VLeft (V (FileAlreadyExistsError fp)) -> do
               runLogger $ logWarn $
@@ -481,7 +482,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
               pure $ ExitFailure 3
             VLeft e -> do
               runLogger $ do
-                logError $ T.pack $ prettyShow e
+                logError $ T.pack $ prettyHFError e
                 logError $ "Also check the logs in " <> T.pack (fromGHCupPath logsDir)
               pure $ ExitFailure 4
 
@@ -501,7 +502,7 @@ install installCommand settings getAppState' runLogger = case installCommand of
           runInstTool s'{ settings = settings { noVerify = True}} $ do
             (_tvVersion -> v, vi) <- liftE $ fromVersion instVer Stack
             liftE $ runBothE' (installStackBindist
-                                       (DownloadInfo uri Nothing "")
+                                       (DownloadInfo uri Nothing "" Nothing)
                                        v
                                        (maybe GHCupInternal IsolateDir isolateDir)
                                        forceInstall
@@ -515,14 +516,14 @@ install installCommand settings getAppState' runLogger = case installCommand of
                 runLogger $ logInfo msg
               pure ExitSuccess
             VLeft e@(V (AlreadyInstalled _ _)) -> do
-              runLogger $ logWarn $ T.pack $ prettyShow e
+              runLogger $ logWarn $ T.pack $ prettyHFError e
               pure ExitSuccess
             VLeft (V (FileAlreadyExistsError fp)) -> do
               runLogger $ logWarn $
                 "File " <> T.pack fp <> " already exists. Use 'ghcup install stack --isolate " <> T.pack fp <> " --force ..." <> "' if you want to overwrite."
               pure $ ExitFailure 3
             VLeft e@(V (AlreadyInstalled _ _)) -> do
-              runLogger $ logWarn $ T.pack $ prettyShow e
+              runLogger $ logWarn $ T.pack $ prettyHFError e
               pure ExitSuccess
             VLeft (V (FileAlreadyExistsError fp)) -> do
               runLogger $ logWarn $
@@ -530,6 +531,6 @@ install installCommand settings getAppState' runLogger = case installCommand of
               pure $ ExitFailure 3
             VLeft e -> do
               runLogger $ do
-                logError $ T.pack $ prettyShow e
+                logError $ T.pack $ prettyHFError e
                 logError $ "Also check the logs in " <> T.pack (fromGHCupPath logsDir)
               pure $ ExitFailure 4

app/ghcup/GHCup/OptParse/Nuke.hs

@@ -26,7 +26,6 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -95,5 +94,5 @@ nuke appState runLogger = do
                       pure ExitSuccess
 
                 VLeft e -> do
-                  runLogger $ logError $ T.pack $ prettyShow e
+                  runLogger $ logError $ T.pack $ prettyHFError e
                   pure $ ExitFailure 15

app/ghcup/GHCup/OptParse/Prefetch.hs

@@ -30,7 +30,6 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -153,6 +152,7 @@ type PrefetchEffects = '[ TagNotFound
                         , NoToolVersionSet
                         , NoDownload
                         , DigestError
+                        , ContentLengthError
                         , GPGError
                         , DownloadFailed
                         , JSONError
@@ -215,5 +215,5 @@ prefetch prefetchCommand runAppState runLogger =
                 VRight _ -> do
                       pure ExitSuccess
                 VLeft e -> do
-                  runLogger $ logError $ T.pack $ prettyShow e
+                  runLogger $ logError $ T.pack $ prettyHFError e
                   pure $ ExitFailure 15

app/ghcup/GHCup/OptParse/Rm.hs

@@ -34,7 +34,6 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -175,11 +174,11 @@ rm rmCommand runAppState runLogger = case rmCommand of
       )
       >>= \case
             VRight vi -> do
-              forM_ (_viPostRemove =<< vi) $ \msg ->
+              runLogger $ logGHCPostRm ghcVer
-                runLogger $ logInfo msg
+              postRmLog vi
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 7
 
   rmCabal' tv =
@@ -191,11 +190,10 @@ rm rmCommand runAppState runLogger = case rmCommand of
       )
       >>= \case
             VRight vi -> do
-              forM_ (_viPostRemove =<< vi) $ \msg ->
+              postRmLog vi
-                runLogger $ logInfo msg
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 15
 
   rmHLS' tv =
@@ -207,11 +205,10 @@ rm rmCommand runAppState runLogger = case rmCommand of
       )
       >>= \case
             VRight vi -> do
-              forM_ (_viPostRemove =<< vi) $ \msg ->
+              postRmLog vi
-                runLogger $ logInfo msg
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 15
 
   rmStack' tv =
@@ -223,10 +220,12 @@ rm rmCommand runAppState runLogger = case rmCommand of
       )
       >>= \case
             VRight vi -> do
-              forM_ (_viPostRemove =<< vi) $ \msg ->
+              postRmLog vi
-                runLogger $ logInfo msg
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 15
 
+  postRmLog vi =
+    forM_ (_viPostRemove =<< vi) $ \msg ->
+      runLogger $ logInfo msg

app/ghcup/GHCup/OptParse/Run.hs

@@ -40,7 +40,6 @@ import           Prelude                 hiding ( appendFile )
 import           System.FilePath
 import           System.Environment
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Map.Strict               as Map
 import qualified Data.Text                     as T
@@ -177,6 +176,7 @@ type RunEffects = '[ AlreadyInstalled
                    , BuildFailed
                    , TagNotFound
                    , DigestError
+                   , ContentLengthError
                    , GPGError
                    , DownloadFailed
                    , TarDirDoesNotExist
@@ -265,11 +265,11 @@ run RunOptions{..} runAppState leanAppstate runLogger = do
                case r' of
                  VRight _ -> pure ExitSuccess
                  VLeft e -> do
-                   runLogger $ logError $ T.pack $ prettyShow e
+                   runLogger $ logError $ T.pack $ prettyHFError e
                    pure $ ExitFailure 28
 #endif
          VLeft e -> do
-           runLogger $ logError $ T.pack $ prettyShow e
+           runLogger $ logError $ T.pack $ prettyHFError e
            pure $ ExitFailure 27
 
   where
@@ -343,6 +343,7 @@ run RunOptions{..} runAppState leanAppstate runLogger = do
                               , DownloadFailed
                               , DirNotEmpty
                               , DigestError
+                              , ContentLengthError
                               , BuildFailed
                               , ArchiveResult
                               , AlreadyInstalled

app/ghcup/GHCup/OptParse/Set.hs

@@ -35,7 +35,6 @@ import           Options.Applicative     hiding ( style )
 import           Options.Applicative.Help.Pretty ( text )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Data.Bifunctor (second)
@@ -286,7 +285,7 @@ set setCommand runAppState runLeanAppState runLogger = case setCommand of
                     "GHC " <> prettyVer _tvVersion <> " successfully set as default version" <> maybe "" (" for cross target " <>) _tvTarget
               pure ExitSuccess
             VLeft e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 5
 
 
@@ -307,7 +306,7 @@ set setCommand runAppState runLeanAppState runLogger = case setCommand of
                     "Cabal " <> prettyVer (_tvVersion v) <> " successfully set as default version"
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 14
 
   setHLS' :: SetOptions
@@ -327,7 +326,7 @@ set setCommand runAppState runLeanAppState runLogger = case setCommand of
                     "HLS " <> prettyVer (_tvVersion v) <> " successfully set as default version"
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 14
 
 
@@ -348,5 +347,5 @@ set setCommand runAppState runLeanAppState runLogger = case setCommand of
                     "Stack " <> prettyVer (_tvVersion v) <> " successfully set as default version"
               pure ExitSuccess
             VLeft  e -> do
-              runLogger $ logError $ T.pack $ prettyShow e
+              runLogger $ logError $ T.pack $ prettyHFError e
               pure $ ExitFailure 14

app/ghcup/GHCup/OptParse/ToolRequirements.hs

@@ -23,7 +23,6 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import qualified Data.Text.IO                  as T
@@ -118,5 +117,5 @@ toolRequirements ToolReqOpts{..} runAppState runLogger = runToolRequirements run
     >>= \case
           VRight _ -> pure ExitSuccess
           VLeft  e -> do
-            runLogger $ logError $ T.pack $ prettyShow e
+            runLogger $ logError $ T.pack $ prettyHFError e
             pure $ ExitFailure 12

app/ghcup/GHCup/OptParse/UnSet.hs

@@ -31,7 +31,6 @@ import           Options.Applicative     hiding ( style )
 import           Options.Applicative.Help.Pretty ( text )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -189,7 +188,7 @@ unset unsetCommand runLeanAppState runLogger = case unsetCommand of
                 runLogger $ logInfo "GHC successfully unset"
                 pure ExitSuccess
               VLeft  e -> do
-                runLogger $ logError $ T.pack $ prettyShow e
+                runLogger $ logError $ T.pack $ prettyHFError e
                 pure $ ExitFailure 14
   (UnsetCabal (UnsetOptions _)) -> do
     void $ runLeanAppState (VRight <$> unsetCabal)

app/ghcup/GHCup/OptParse/Upgrade.hs

@@ -28,7 +28,6 @@ import           Haskus.Utils.Variant.Excepts
 import           Options.Applicative     hiding ( style )
 import           Prelude                 hiding ( appendFile )
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -88,6 +87,7 @@ upgradeOptsP =
 
 
 type UpgradeEffects = '[ DigestError
+                       , ContentLengthError
                        , GPGError
                        , NoDownload
                        , NoUpdate
@@ -151,5 +151,5 @@ upgrade uOpts force' fatal Dirs{..} runAppState runLogger = do
         runLogger $ logWarn "No GHCup update available"
         pure ExitSuccess
       VLeft e -> do
-        runLogger $ logError $ T.pack $ prettyShow e
+        runLogger $ logError $ T.pack $ prettyHFError e
         pure $ ExitFailure 11

app/ghcup/GHCup/OptParse/Whereis.hs

@@ -34,7 +34,6 @@ import           Options.Applicative.Help.Pretty ( text )
 import           Prelude                 hiding ( appendFile )
 import           System.Environment
 import           System.Exit
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 
 import qualified Data.Text                     as T
 import Control.Exception.Safe (MonadMask)
@@ -288,7 +287,7 @@ whereis whereisCommand whereisOptions runAppState leanAppstate runLogger = do
                 liftIO $ putStr r
                 pure ExitSuccess
               VLeft e -> do
-                runLogger $ logError $ T.pack $ prettyShow e
+                runLogger $ logError $ T.pack $ prettyHFError e
                 pure $ ExitFailure 30
     (WhereisTool tool (Just (ToolVersion v)), WhereisOptions{..}) ->
       runLeanWhereIs leanAppstate (do
@@ -302,7 +301,7 @@ whereis whereisCommand whereisOptions runAppState leanAppstate runLogger = do
                 liftIO $ putStr r
                 pure ExitSuccess
               VLeft e -> do
-                runLogger $ logError $ T.pack $ prettyShow e
+                runLogger $ logError $ T.pack $ prettyHFError e
                 pure $ ExitFailure 30
 
     (WhereisTool tool whereVer, WhereisOptions{..}) -> do
@@ -318,7 +317,7 @@ whereis whereisCommand whereisOptions runAppState leanAppstate runLogger = do
                 liftIO $ putStr r
                 pure ExitSuccess
               VLeft e -> do
-                runLogger $ logError $ T.pack $ prettyShow e
+                runLogger $ logError $ T.pack $ prettyHFError e
                 pure $ ExitFailure 30
 
     (WhereisBaseDir, _) -> do

app/ghcup/Main.hs

@@ -79,6 +79,7 @@ toSettings options = do
    mergeConf Options{..} UserSettings{..} noColor =
      let cache       = fromMaybe (fromMaybe (Types.cache defaultSettings) uCache) optCache
          metaCache   = fromMaybe (fromMaybe (Types.metaCache defaultSettings) uMetaCache) optMetaCache
+         metaMode    = fromMaybe (fromMaybe (Types.metaMode defaultSettings) uMetaMode) optMetaMode
          noVerify    = fromMaybe (fromMaybe (Types.noVerify defaultSettings) uNoVerify) optNoVerify
          verbose     = fromMaybe (fromMaybe (Types.verbose defaultSettings) uVerbose) optVerbose
          keepDirs    = fromMaybe (fromMaybe (Types.keepDirs defaultSettings) uKeepDirs) optKeepDirs
@@ -205,19 +206,19 @@ Report bugs at <https://github.com/haskell/ghcup-hs/issues>|]
                                           VRight r -> pure r
                                           VLeft e -> do
                                             runLogger
-                                              (logError $ T.pack $ prettyShow e)
+                                              (logError $ T.pack $ prettyHFError e)
                                             exitWith (ExitFailure 2)
 
                 ghcupInfo <-
                   ( flip runReaderT leanAppstate
-                    . runE @'[DigestError, GPGError, JSONError , DownloadFailed, FileDoesNotExistError]
+                    . runE @'[DigestError, ContentLengthError, GPGError, JSONError , DownloadFailed, FileDoesNotExistError]
                     $ liftE getDownloadsF
                     )
                     >>= \case
                           VRight r -> pure r
                           VLeft  e -> do
                             runLogger
-                              (logError $ T.pack $ prettyShow e)
+                              (logError $ T.pack $ prettyHFError e)
                             exitWith (ExitFailure 2)
                 let s' = AppState settings dirs keybindings ghcupInfo pfreq loggerConfig
 
@@ -253,7 +254,7 @@ Report bugs at <https://github.com/haskell/ghcup-hs/issues>|]
                                         logWarn ("New "
                                           <> T.pack (prettyShow t)
                                           <> " version available. "
-                                          <> "To upgrade, run 'ghcup install "
+                                          <> "If you want to install this latest version, run 'ghcup install "
                                           <> T.pack (prettyShow t)
                                           <> " "
                                           <> prettyVer l
@@ -265,7 +266,7 @@ Report bugs at <https://github.com/haskell/ghcup-hs/issues>|]
                   VRight _ -> pure ()
                   VLeft e -> do
                     runLogger
-                      (logError $ T.pack $ prettyShow e)
+                      (logError $ T.pack $ prettyHFError e)
                     exitWith (ExitFailure 30)
                 pure s'
 
@@ -310,6 +311,7 @@ Report bugs at <https://github.com/haskell/ghcup-hs/issues>|]
             Prefetch pfCom             -> prefetch pfCom runAppState runLogger
             GC gcOpts                  -> gc gcOpts runAppState runLogger
             Run runCommand             -> run runCommand appState leanAppstate runLogger
+            PrintAppErrors             -> putStrLn allHFError >> pure ExitSuccess
 
           case res of
             ExitSuccess        -> pure ()

data/config.yaml

@@ -40,6 +40,12 @@ key-bindings:
 # of the file. These usually are in '~/.ghcup/cache/ghcup-<ver>.yaml'.
 meta-cache: 300 # in seconds
 
+# When trying to download ghcup metadata, this option decides what to do
+# when the download fails:
+#   1. Lax: use existing ~/.ghcup/cache/ghcup-<ver>.yaml as fallback (default)
+#   2. Strict: fail hard
+meta-mode: Lax # Strict | Lax
+
 # Where to get GHC/cabal/hls download info/versions from. For more detailed explanation
 # check the 'URLSource' type in the code.
 url-source:

docs/install.md

@@ -48,6 +48,10 @@ The following distro packages are required: `build-essential curl libffi-dev lib
 
 The following distro packages are required: `gcc gcc-c++ gmp gmp-devel make ncurses ncurses-compat-libs xz perl`
 
+### Linux Mageia
+
+The following distro packages are required: `curl gcc gcc-c++ gmp libffi-devel libffi7 libgmp-devel libgmp10 make libncurses-devel libncurses5 xz perl`
+
 ### Linux CentOS
 
 The following distro packages are required: `gcc gcc-c++ gmp gmp-devel make ncurses ncurses-compat-libs xz perl`

ghcup.cabal

@@ -247,6 +247,7 @@ executable ghcup
     , base                  >=4.12     && <5
     , bytestring            >=0.10     && <0.12
     , cabal-plan            ^>=0.7.2
+    , cabal-install-parsers >=0.4.5
     , containers            ^>=0.6
     , deepseq               ^>=1.4
     , directory             ^>=1.3.6.0

lib/GHCup.hs

@@ -78,7 +78,6 @@ import           Text.Regex.Posix
 
 import qualified Data.Text                     as T
 import qualified Streamly.Prelude              as S
-import Text.PrettyPrint.HughesPJClass (prettyShow)
 
 
 
@@ -106,6 +105,7 @@ fetchToolBindist :: ( MonadFail m
                  -> Maybe FilePath
                  -> Excepts
                       '[ DigestError
+                       , ContentLengthError
                        , GPGError
                        , DownloadFailed
                        , NoDownload
@@ -288,6 +288,7 @@ upgradeGHCup :: ( MonadMask m
              -> Excepts
                   '[ CopyError
                    , DigestError
+                   , ContentLengthError
                    , GPGError
                    , GPGError
                    , DownloadFailed
@@ -308,7 +309,7 @@ upgradeGHCup mtarget force' fatal = do
   dli   <- liftE $ getDownloadInfo GHCup latestVer
   tmp   <- fromGHCupPath <$> lift withGHCupTmpDir
   let fn = "ghcup" <> exeExt
-  p <- liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) tmp (Just fn) False
+  p <- liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) (_dlCSize dli) tmp (Just fn) False
   let destDir = takeDirectory destFile
       destFile = fromMaybe (binDir </> fn) mtarget
   lift $ logDebug $ "mkdir -p " <> T.pack destDir
@@ -326,7 +327,7 @@ upgradeGHCup mtarget force' fatal = do
     Just pa
       | fatal -> throwE (ToolShadowed GHCup pa destFile latestVer)
       | otherwise ->
-        lift $ logWarn $ T.pack $ prettyShow (ToolShadowed GHCup pa destFile latestVer)
+        lift $ logWarn $ T.pack $ prettyHFError (ToolShadowed GHCup pa destFile latestVer)
 
   pure latestVer
 

lib/GHCup/Cabal.hs

@@ -50,7 +50,6 @@ import           System.FilePath
 import           System.IO.Error
 
 import qualified Data.Text                     as T
-import Text.PrettyPrint.HughesPJClass (prettyShow)
 
 
 
@@ -81,6 +80,7 @@ installCabalBindist :: ( MonadMask m
                          '[ AlreadyInstalled
                           , CopyError
                           , DigestError
+                          , ContentLengthError
                           , GPGError
                           , DownloadFailed
                           , NoDownload
@@ -184,6 +184,7 @@ installCabalBin :: ( MonadMask m
                      '[ AlreadyInstalled
                       , CopyError
                       , DigestError
+                      , ContentLengthError
                       , GPGError
                       , DownloadFailed
                       , NoDownload
@@ -233,7 +234,7 @@ setCabal ver = do
 
   liftIO (isShadowed cabalbin) >>= \case
     Nothing -> pure ()
-    Just pa -> lift $ logWarn $ T.pack $ prettyShow (ToolShadowed Cabal pa cabalbin ver)
+    Just pa -> lift $ logWarn $ T.pack $ prettyHFError (ToolShadowed Cabal pa cabalbin ver)
 
   pure ()
 

lib/GHCup/Download.hs

@@ -75,7 +75,6 @@ import           System.Exit
 import           System.FilePath
 import           System.IO.Error
 import           System.IO.Temp
-import           Text.PrettyPrint.HughesPJClass ( prettyShow )
 import           URI.ByteString
 
 import qualified Crypto.Hash.SHA256            as SHA256
@@ -114,7 +113,7 @@ getDownloadsF :: ( FromJSONKey Tool
                  , MonadMask m
                  )
               => Excepts
-                   '[DigestError, GPGError, JSONError , DownloadFailed , FileDoesNotExistError]
+                   '[DigestError, ContentLengthError, GPGError, JSONError , DownloadFailed , FileDoesNotExistError]
                    m
                    GHCupInfo
 getDownloadsF = do
@@ -162,17 +161,21 @@ getBase :: ( MonadReader env m
            , MonadMask m
            )
         => URI
-        -> Excepts '[GPGError, DigestError, JSONError, FileDoesNotExistError] m GHCupInfo
+        -> Excepts '[DownloadFailed, GPGError, DigestError, ContentLengthError, JSONError, FileDoesNotExistError] m GHCupInfo
 getBase uri = do
-  Settings { noNetwork, downloader } <- lift getSettings
+  Settings { noNetwork, downloader, metaMode } <- lift getSettings
 
   -- try to download yaml... usually this writes it into cache dir,
   -- but in some cases not (e.g. when using file://), so we honour
   -- the return filepath, if any
   mYaml <- if noNetwork && view (uriSchemeL' % schemeBSL') uri /= "file" -- for file://, let it fall through
            then pure Nothing
-           else handleIO (\e -> lift (warnCache (displayException e) downloader) >> pure Nothing)
+           else handleIO (\e -> case metaMode of
-               . catchE @_ @_ @'[] (\e@(DownloadFailed _) -> lift (warnCache (prettyShow e) downloader) >> pure Nothing)
+                                  Strict -> throwIO e
+                                  Lax -> lift (warnCache (displayException e) downloader) >> pure Nothing)
+               . catchE @_ @_ @'[DownloadFailed] (\e@(DownloadFailed _) -> case metaMode of
+                   Strict -> throwE e
+                   Lax -> lift (warnCache (prettyHFError e) downloader) >> pure Nothing)
                . fmap Just
                . smartDl
                $ uri
@@ -184,7 +187,7 @@ getBase uri = do
   liftE
     . onE_ (onError actualYaml)
     . lEM' @_ @_ @'[JSONError] (\(displayException -> e) -> JSONDecodeError $ unlines [e, "Consider removing " <> actualYaml <> " manually."])
-    . liftIO 
+    . liftIO
     . Y.decodeFileEither
     $ actualYaml
  where
@@ -229,6 +232,7 @@ getBase uri = do
           -> Excepts
                '[ DownloadFailed
                 , DigestError
+                , ContentLengthError
                 , GPGError
                 ]
                m1
@@ -242,7 +246,7 @@ getBase uri = do
     Settings { metaCache } <- lift getSettings
 
        -- for local files, let's short-circuit and ignore access time
-    if | scheme == "file" -> liftE $ download uri' Nothing Nothing (fromGHCupPath cacheDir) Nothing True
+    if | scheme == "file" -> liftE $ download uri' Nothing Nothing Nothing (fromGHCupPath cacheDir) Nothing True
        | e -> do
           accessTime <- fmap utcTimeToPOSIXSeconds $ liftIO $ getAccessTime json_file
           let sinceLastAccess = utcTimeToPOSIXSeconds currentTime - accessTime
@@ -258,7 +262,7 @@ getBase uri = do
    where
     dlWithMod modTime json_file = do
       let (dir, fn) = splitFileName json_file
-      f <- liftE $ download uri' (Just $ over pathL' (<> ".sig") uri') Nothing dir (Just fn) True
+      f <- liftE $ download uri' (Just $ over pathL' (<> ".sig") uri') Nothing Nothing dir (Just fn) True
       liftIO $ setModificationTime f modTime
       liftIO $ setAccessTime f modTime
       pure f
@@ -324,13 +328,14 @@ download :: ( MonadReader env m
          => URI
          -> Maybe URI         -- ^ URI for gpg sig
          -> Maybe T.Text      -- ^ expected hash
+         -> Maybe Integer     -- ^ expected content length
          -> FilePath          -- ^ destination dir (ignored for file:// scheme)
          -> Maybe FilePath    -- ^ optional filename
          -> Bool              -- ^ whether to read an write etags
-         -> Excepts '[DigestError , DownloadFailed, GPGError] m FilePath
+         -> Excepts '[DigestError, ContentLengthError, DownloadFailed, GPGError] m FilePath
-download uri gpgUri eDigest dest mfn etags
+download uri gpgUri eDigest eCSize dest mfn etags
-  | scheme == "https" = dl
+  | scheme == "https" = liftE dl
-  | scheme == "http"  = dl
+  | scheme == "http"  = liftE dl
   | scheme == "file"  = do
       let destFile' = T.unpack . decUTF8Safe $ view pathL' uri
       lift $ logDebug $ "using local file: " <> T.pack destFile'
@@ -351,7 +356,7 @@ download uri gpgUri eDigest dest mfn etags
     -- download
     flip onException
          (lift $ hideError doesNotExistErrorType $ recycleFile (tmpFile baseDestFile))
-     $ catchAllE @_ @'[GPGError, ProcessError, DownloadFailed, UnsupportedScheme, DigestError] @'[DigestError, DownloadFailed, GPGError]
+     $ catchAllE @_ @'[GPGError, ProcessError, DownloadFailed, UnsupportedScheme, DigestError, ContentLengthError] @'[DigestError, ContentLengthError, DownloadFailed, GPGError]
           (\e' -> do
             lift $ hideError doesNotExistErrorType $ recycleFile (tmpFile baseDestFile)
             case e' of
@@ -386,7 +391,7 @@ download uri gpgUri eDigest dest mfn etags
                   liftE $ flip onException
                        (lift $ hideError doesNotExistErrorType $ recycleFile (tmpFile gpgDestFile))
                    $ catchAllE @_ @'[GPGError, ProcessError, UnsupportedScheme, DownloadFailed] @'[GPGError]
-                        (\e -> if gpgSetting == GPGStrict then throwE (GPGError e) else lift $ logWarn $ T.pack (prettyShow (GPGError e))
+                        (\e -> if gpgSetting == GPGStrict then throwE (GPGError e) else lift $ logWarn $ T.pack (prettyHFError (GPGError e))
                         ) $ do
                       o' <- liftIO getGpgOpts
                       lift $ logDebug $ "downloading: " <> (decUTF8Safe . serializeURIRef') gpgUri' <> " as file " <> T.pack gpgDestFile
@@ -401,19 +406,37 @@ download uri gpgUri eDigest dest mfn etags
                         CapturedProcess { _stdErr } -> lift $ logDebug $ decUTF8Safe' _stdErr
                 _ -> pure ()
 
+              forM_ eCSize  (liftE . flip checkCSize  baseDestFile)
               forM_ eDigest (liftE . flip checkDigest baseDestFile)
     pure baseDestFile
 
-  curlDL :: (MonadCatch m, MonadMask m, MonadIO m) => [String] -> FilePath -> URI -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
+  curlDL :: ( MonadCatch m
+            , MonadMask m
+            , MonadIO m
+            )
+         => [String]
+         -> FilePath
+         -> URI
+         -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
   curlDL o' destFile (decUTF8Safe . serializeURIRef' -> uri') = do
     let destFileTemp = tmpFile destFile
     flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
       liftE $ lEM @_ @'[ProcessError] $ exec "curl"
-        (o' ++ ["-fL", "-o", destFileTemp, T.unpack uri']) Nothing Nothing
+        (o' ++ ["-fL", "-o", destFileTemp, T.unpack uri']
+            ++ maybe [] (\s -> ["--max-filesize", show s]) eCSize
+        ) Nothing Nothing
       liftIO $ renameFile destFileTemp destFile
 
-  curlEtagsDL :: (MonadReader env m, HasLog env, MonadCatch m, MonadMask m, MonadIO m)
+  curlEtagsDL :: ( MonadReader env m
-              => [String] -> FilePath -> URI -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
+                 , HasLog env
+                 , MonadCatch m
+                 , MonadMask m
+                 , MonadIO m
+                 )
+              => [String]
+              -> FilePath
+              -> URI
+              -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
   curlEtagsDL o' destFile (decUTF8Safe . serializeURIRef' -> uri') = do
     let destFileTemp = tmpFile destFile
     dh <- liftIO $ emptySystemTempFile "curl-header"
@@ -440,7 +463,14 @@ download uri gpgUri eDigest dest mfn etags
 
         lift $ writeEtags destFile (parseEtags headers)
 
-  wgetDL :: (MonadCatch m, MonadMask m, MonadIO m) => [String] -> FilePath -> URI -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
+  wgetDL :: ( MonadCatch m
+            , MonadMask m
+            , MonadIO m
+            )
+         => [String]
+         -> FilePath
+         -> URI
+         -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
   wgetDL o' destFile (decUTF8Safe . serializeURIRef' -> uri') = do
     let destFileTemp = tmpFile destFile
     flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
@@ -449,8 +479,16 @@ download uri gpgUri eDigest dest mfn etags
       liftIO $ renameFile destFileTemp destFile
 
 
-  wgetEtagsDL :: (MonadReader env m, HasLog env, MonadCatch m, MonadMask m, MonadIO m)
+  wgetEtagsDL :: ( MonadReader env m
-              => [String] -> FilePath -> URI -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
+                 , HasLog env
+                 , MonadCatch m
+                 , MonadMask m
+                 , MonadIO m
+                 )
+              => [String]
+              -> FilePath
+              -> URI
+              -> Excepts '[ProcessError, DownloadFailed, UnsupportedScheme] m ()
   wgetEtagsDL o' destFile (decUTF8Safe . serializeURIRef' -> uri') = do
     let destFileTemp = tmpFile destFile
     flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
@@ -471,7 +509,10 @@ download uri gpgUri eDigest dest mfn etags
           | otherwise -> throwE (NonZeroExit i' "wget" opts)
 
 #if defined(INTERNAL_DOWNLOADER)
-  internalDL :: (MonadCatch m, MonadMask m, MonadIO m)
+  internalDL :: ( MonadCatch m
+                , MonadMask m
+                , MonadIO m
+                )
              => FilePath -> URI -> Excepts '[DownloadFailed, UnsupportedScheme] m ()
   internalDL destFile uri' = do
     let destFileTemp = tmpFile destFile
@@ -481,11 +522,16 @@ download uri gpgUri eDigest dest mfn etags
                  @'[DownloadFailed]
             (\e@(HTTPNotModified _) ->
               throwE @_ @'[DownloadFailed] (DownloadFailed (toVariantAt @0 e :: V '[HTTPNotModified])))
-        $ downloadToFile https host fullPath port destFileTemp mempty
+        $ downloadToFile https host fullPath port destFileTemp mempty eCSize
       liftIO $ renameFile destFileTemp destFile
 
 
-  internalEtagsDL :: (MonadReader env m, HasLog env, MonadCatch m, MonadMask m, MonadIO m)
+  internalEtagsDL :: ( MonadReader env m
+                     , HasLog env
+                     , MonadCatch m
+                     , MonadMask m
+                     , MonadIO m
+                     )
                   => FilePath -> URI -> Excepts '[DownloadFailed, UnsupportedScheme] m ()
   internalEtagsDL destFile uri' = do
     let destFileTemp = tmpFile destFile
@@ -497,7 +543,7 @@ download uri gpgUri eDigest dest mfn etags
       liftE
         $ catchE @HTTPNotModified @'[DownloadFailed] @'[] (\(HTTPNotModified etag) -> lift $ writeEtags destFile (pure $ Just etag))
         $ do
-          r <- downloadToFile https host fullPath port destFileTemp addHeaders
+          r <- downloadToFile https host fullPath port destFileTemp addHeaders eCSize
           liftIO $ renameFile destFileTemp destFile
           lift $ writeEtags destFile (pure $ decUTF8Safe <$> getHeader r "etag")
 #endif
@@ -505,7 +551,7 @@ download uri gpgUri eDigest dest mfn etags
 
   -- Manage to find a file we can write the body into.
   getDestFile :: Monad m => URI -> Maybe FilePath -> Excepts '[NoUrlBase] m FilePath
-  getDestFile uri' mfn' = 
+  getDestFile uri' mfn' =
     let path = view pathL' uri'
     in case mfn' of
         Just fn -> pure (dest </> fn)
@@ -574,14 +620,14 @@ downloadCached :: ( MonadReader env m
                   )
                => DownloadInfo
                -> Maybe FilePath  -- ^ optional filename
-               -> Excepts '[DigestError , DownloadFailed, GPGError] m FilePath
+               -> Excepts '[DigestError, ContentLengthError, DownloadFailed, GPGError] m FilePath
 downloadCached dli mfn = do
   Settings{ cache } <- lift getSettings
   case cache of
     True -> downloadCached' dli mfn Nothing
     False -> do
       tmp <- lift withGHCupTmpDir
-      liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) (fromGHCupPath tmp) mfn False
+      liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) (_dlCSize dli) (fromGHCupPath tmp) mfn False
 
 
 downloadCached' :: ( MonadReader env m
@@ -596,7 +642,7 @@ downloadCached' :: ( MonadReader env m
                 => DownloadInfo
                 -> Maybe FilePath  -- ^ optional filename
                 -> Maybe FilePath  -- ^ optional destination dir (default: cacheDir)
-                -> Excepts '[DigestError , DownloadFailed, GPGError] m FilePath
+                -> Excepts '[DigestError, ContentLengthError, DownloadFailed, GPGError] m FilePath
 downloadCached' dli mfn mDestDir = do
   Dirs { cacheDir } <- lift getDirs
   let destDir = fromMaybe (fromGHCupPath cacheDir) mDestDir
@@ -605,9 +651,10 @@ downloadCached' dli mfn mDestDir = do
   fileExists <- liftIO $ doesFileExist cachfile
   if
     | fileExists -> do
+      forM_ (view dlCSize dli) $ \s -> liftE $ checkCSize s cachfile
       liftE $ checkDigest (view dlHash dli) cachfile
       pure cachfile
-    | otherwise -> liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) destDir mfn False
+    | otherwise -> liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) (_dlCSize dli) destDir mfn False
 
 
 
@@ -638,6 +685,25 @@ checkDigest eDigest file = do
     cDigest <- throwEither . E.decodeUtf8' . B16.encode . SHA256.hashlazy $ c
     when ((cDigest /= eDigest) && verify) $ throwE (DigestError file cDigest eDigest)
 
+checkCSize :: ( MonadReader env m
+              , HasDirs env
+              , HasSettings env
+              , MonadIO m
+              , MonadThrow m
+              , HasLog env
+              )
+           => Integer
+           -> FilePath
+           -> Excepts '[ContentLengthError] m ()
+checkCSize eCSize file = do
+  Settings{ noVerify } <- lift getSettings
+  let verify = not noVerify
+  when verify $ do
+    let p' = takeFileName file
+    lift $ logInfo $ "verifying content length of: " <> T.pack p'
+    cSize <- liftIO $ getFileSize file
+    when ((eCSize /= cSize) && verify) $ throwE (ContentLengthError (Just file) (Just cSize) eCSize)
+
 
 -- | Get additional curl args from env. This is an undocumented option.
 getCurlOpts :: IO [String]

lib/GHCup/Download/IOStreams.hs

@@ -17,14 +17,12 @@ import           Control.Exception.Safe
 import           Control.Monad
 import           Control.Monad.Reader
 import           Data.ByteString                ( ByteString )
-import           Data.ByteString.Builder
 import           Data.CaseInsensitive           ( CI, original, mk )
 import           Data.IORef
 import           Data.Maybe
 import           Data.Text.Read
 import           Haskus.Utils.Variant.Excepts
 import           Network.Http.Client     hiding ( URL )
-import           Optics
 import           Prelude                 hiding ( abs
                                                 , readFile
                                                 , writeFile
@@ -33,7 +31,6 @@ import           System.ProgressBar
 import           URI.ByteString
 
 import qualified Data.ByteString               as BS
-import qualified Data.ByteString.Lazy          as L
 import qualified Data.Map.Strict               as M
 import qualified System.IO.Streams             as Streams
 
@@ -46,27 +43,6 @@ import qualified System.IO.Streams             as Streams
     ----------------------------
 
 
--- | Load the result of this download into memory at once.
-downloadBS' :: MonadIO m
-            => Bool             -- ^ https?
-            -> ByteString       -- ^ host (e.g. "www.example.com")
-            -> ByteString       -- ^ path (e.g. "/my/file") including query
-            -> Maybe Int        -- ^ optional port (e.g. 3000)
-            -> Excepts
-                 '[ HTTPStatusError
-                  , URIParseError
-                  , UnsupportedScheme
-                  , NoLocationHeader
-                  , TooManyRedirs
-                  ]
-                 m
-                 L.ByteString
-downloadBS' https host path port = do
-  bref <- liftIO $ newIORef (mempty :: Builder)
-  let stepper bs = modifyIORef bref (<> byteString bs)
-  void $ downloadInternal False https host path port stepper (pure ()) mempty
-  liftIO (readIORef bref <&> toLazyByteString)
-
 
 downloadToFile :: (MonadMask m, MonadIO m)
                => Bool             -- ^ https?
@@ -75,8 +51,9 @@ downloadToFile :: (MonadMask m, MonadIO m)
                -> Maybe Int        -- ^ optional port (e.g. 3000)
                -> FilePath         -- ^ destination file to create and write to
                -> M.Map (CI ByteString) ByteString -- ^ additional headers
+               -> Maybe Integer    -- ^ expected content length
                -> Excepts '[DownloadFailed, HTTPNotModified] m Response
-downloadToFile https host fullPath port destFile addHeaders = do
+downloadToFile https host fullPath port destFile addHeaders eCSize = do
   let stepper = BS.appendFile destFile
       setup = BS.writeFile destFile mempty
   catchAllE (\case
@@ -84,7 +61,7 @@ downloadToFile https host fullPath port destFile addHeaders = do
                 | i == 304
                 , Just e <- M.lookup (mk "etag") headers -> throwE $ HTTPNotModified (decUTF8Safe e)
               v -> throwE $ DownloadFailed v
-            ) $ downloadInternal True https host fullPath port stepper setup addHeaders
+            ) $ downloadInternal True https host fullPath port stepper setup addHeaders eCSize
 
 
 downloadInternal :: MonadIO m
@@ -96,19 +73,21 @@ downloadInternal :: MonadIO m
                  -> (ByteString -> IO a)   -- ^ the consuming step function
                  -> IO a                   -- ^ setup action
                  -> M.Map (CI ByteString) ByteString -- ^ additional headers
+                 -> Maybe Integer
                  -> Excepts
                       '[ HTTPStatusError
                        , URIParseError
                        , UnsupportedScheme
                        , NoLocationHeader
                        , TooManyRedirs
+                       , ContentLengthError
                        ]
                       m
                       Response
 downloadInternal = go (5 :: Int)
 
  where
-  go redirs progressBar https host path port consumer setup addHeaders = do
+  go redirs progressBar https host path port consumer setup addHeaders eCSize = do
     r <- liftIO $ withConnection' https host port action
     veitherToExcepts r >>= \case
       Right r' ->
@@ -138,25 +117,39 @@ downloadInternal = go (5 :: Int)
     followRedirectURL bs = case parseURI strictURIParserOptions bs of
       Right uri' -> do
         (https', host', fullPath', port') <- liftE $ uriToQuadruple uri'
-        go (redirs - 1) progressBar https' host' fullPath' port' consumer setup addHeaders
+        go (redirs - 1) progressBar https' host' fullPath' port' consumer setup addHeaders eCSize
       Left e -> throwE e
 
     downloadStream r i' = do
       void setup
       let size = case getHeader r "Content-Length" of
             Just x' -> case decimal $ decUTF8Safe x' of
-              Left  _       -> 0
+              Left  _       -> Nothing
-              Right (r', _) -> r'
+              Right (r', _) -> Just r'
-            Nothing -> 0
+            Nothing -> Nothing
 
-      (mpb :: Maybe (ProgressBar ())) <- if progressBar
+      forM_ size $ \s -> forM_ eCSize $ \es -> when (es /= s) $ throwIO (ContentLengthError Nothing (Just s) es)
-        then Just <$> newProgressBar defStyle 10 (Progress 0 size ())
+      let size' = eCSize <|> size
-        else pure Nothing
+
+      (mpb :: Maybe (ProgressBar ())) <- case (progressBar, size') of
+        (True, Just size'') -> Just <$> newProgressBar defStyle 10 (Progress 0 (fromInteger size'') ())
+        _ -> pure Nothing
+
+      ior <- liftIO $ newIORef 0
 
       outStream <- liftIO $ Streams.makeOutputStream
         (\case
           Just bs -> do
-            forM_ mpb $ \pb -> incProgress pb (BS.length bs)
+            let len = BS.length bs
+            forM_ mpb $ \pb -> incProgress pb len
+
+            -- check we don't exceed size
+            forM_ size' $ \s -> do
+              cs <- readIORef ior
+              when ((cs + toInteger len) > s) $ throwIO (ContentLengthError Nothing (Just (cs + toInteger len)) s)
+
+            modifyIORef ior (+ toInteger len)
+
             void $ consumer bs
           Nothing -> pure ()
         )

lib/GHCup/Errors.hs

@@ -6,6 +6,7 @@
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TypeOperators           #-}
 {-# LANGUAGE FlexibleInstances           #-}
+{-# LANGUAGE RankNTypes           #-}
 
 {-|
 Module      : GHCup.Errors
@@ -34,9 +35,150 @@ import           URI.ByteString
 
 import qualified Data.Map.Strict               as M
 import qualified Data.Text                     as T
+import           Data.Data (Proxy(..))
 
 
 
+allHFError :: String
+allHFError = unlines allErrors
+ where
+  format p = "GHCup-" <> show (eBase p) <> " " <>  eDesc p
+  format'' e p = "GHCup-" <> show (eNum e) <> " " <>  eDesc p
+  format' e  _ = "GHCup-" <> show (eNum e) <> " " <>  prettyShow e
+  format''' e  _ str' = "GHCup-" <> show (eNum e) <> " " <>  str'
+  allErrors =
+    [ "# low level errors (1 to 500)"
+    , let proxy = Proxy :: Proxy NoCompatiblePlatform in format proxy
+    , let proxy = Proxy :: Proxy NoDownload in format proxy
+    , let proxy = Proxy :: Proxy NoUpdate in format proxy
+    , let proxy = Proxy :: Proxy DistroNotFound in format proxy
+    , let proxy = Proxy :: Proxy UnknownArchive in format proxy
+    , let proxy = Proxy :: Proxy UnsupportedScheme in format proxy
+    , let proxy = Proxy :: Proxy CopyError in format proxy
+    , let proxy = Proxy :: Proxy MergeFileTreeError in format proxy
+    , let proxy = Proxy :: Proxy TagNotFound in format proxy
+    , let proxy = Proxy :: Proxy NextVerNotFound in format proxy
+    , let proxy = Proxy :: Proxy AlreadyInstalled in format proxy
+    , let proxy = Proxy :: Proxy DirNotEmpty in format proxy
+    , let proxy = Proxy :: Proxy NotInstalled in format proxy
+    , let proxy = Proxy :: Proxy UninstallFailed in format proxy
+    , let proxy = Proxy :: Proxy NotFoundInPATH in format proxy
+    , let proxy = Proxy :: Proxy JSONError in format proxy
+    , let proxy = Proxy :: Proxy FileDoesNotExistError in format proxy
+    , let proxy = Proxy :: Proxy FileAlreadyExistsError in format proxy
+    , let proxy = Proxy :: Proxy TarDirDoesNotExist in format proxy
+    , let proxy = Proxy :: Proxy DigestError in format proxy
+    , let proxy = Proxy :: Proxy GPGError in format proxy
+    , let proxy = Proxy :: Proxy HTTPStatusError in format proxy
+    , let proxy = Proxy :: Proxy MalformedHeaders in format proxy
+    , let proxy = Proxy :: Proxy HTTPNotModified in format proxy
+    , let proxy = Proxy :: Proxy NoLocationHeader in format proxy
+    , let proxy = Proxy :: Proxy TooManyRedirs in format proxy
+    , let proxy = Proxy :: Proxy PatchFailed in format proxy
+    , let proxy = Proxy :: Proxy NoToolRequirements in format proxy
+    , let proxy = Proxy :: Proxy InvalidBuildConfig in format proxy
+    , let proxy = Proxy :: Proxy NoToolVersionSet in format proxy
+    , let proxy = Proxy :: Proxy NoNetwork in format proxy
+    , let proxy = Proxy :: Proxy HadrianNotFound in format proxy
+    , let proxy = Proxy :: Proxy ToolShadowed in format proxy
+    , let proxy = Proxy :: Proxy ContentLengthError in format proxy
+    , ""
+    , "# high level errors (5000+)"
+    , let proxy = Proxy :: Proxy DownloadFailed in format proxy
+    , let proxy = Proxy :: Proxy InstallSetError in format proxy
+    , let proxy = Proxy :: Proxy BuildFailed in format proxy
+    , let proxy = Proxy :: Proxy GHCupSetError in format proxy
+    , ""
+    , "# true exceptions (500+)"
+    , let proxy = Proxy :: Proxy ParseError in format proxy
+    , let proxy = Proxy :: Proxy UnexpectedListLength in format proxy
+    , let proxy = Proxy :: Proxy NoUrlBase in format proxy
+    , ""
+    , "# orphans (800+)"
+    , let proxy = Proxy :: Proxy URIParseError in format proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedScheme MissingColon
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedUserInfo
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedQuery
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedFragment
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedHost
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedPort
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = MalformedPath
+      in format' e proxy
+    , let proxy = Proxy :: Proxy URIParseError
+          e     = OtherError ""
+      in format'' e proxy
+    , let proxy = Proxy :: Proxy ArchiveResult in format proxy
+    , let proxy = Proxy :: Proxy ArchiveResult
+          e     = ArchiveFatal
+      in format' e proxy
+    , let proxy = Proxy :: Proxy ArchiveResult
+          e     = ArchiveFailed
+      in format' e proxy
+    , let proxy = Proxy :: Proxy ArchiveResult
+          e     = ArchiveWarn
+      in format' e proxy
+    , let proxy = Proxy :: Proxy ArchiveResult
+          e     = ArchiveRetry
+      in format' e proxy
+    , let proxy = Proxy :: Proxy ArchiveResult
+          e     = ArchiveOk
+      in format' e proxy
+    , let proxy = Proxy :: Proxy ArchiveResult
+          e     = ArchiveEOF
+      in format' e proxy
+
+    , let proxy = Proxy :: Proxy ProcessError in format proxy
+    , let proxy = Proxy :: Proxy ProcessError
+          e     = NonZeroExit 0 "" []
+      in format''' e proxy "A process returned a non-zero exit code."
+    , let proxy = Proxy :: Proxy ProcessError
+          e     = PTerminated "" []
+      in format''' e proxy "A process terminated prematurely."
+    , let proxy = Proxy :: Proxy ProcessError
+          e     = PStopped "" []
+      in format''' e proxy "A process stopped prematurely."
+    , let proxy = Proxy :: Proxy ProcessError
+          e     = NoSuchPid "" []
+      in format''' e proxy "Could not find PID for this process."
+    ]
+
+
+prettyHFError :: (Pretty e, HFErrorProject e) => e -> String
+prettyHFError e =
+  let errorCode = "GHCup-" <> padIntAndShow (eNum e)
+  in ("[" <> linkEscapeCode errorCode  (hfErrorLink errorCode) <> "] ") <> prettyShow e
+ where
+  linkEscapeCode linkText link = "\ESC]8;;" <> link <> "\ESC\\" <> linkText <> "\ESC]8;;\ESC\\"
+  hfErrorLink errorCode = "https://errors.haskell.org/messages/" <> errorCode
+  padIntAndShow i
+    | i < 10    = "0000" <> show i
+    | i < 100   = "000"  <> show i
+    | i < 1000  = "00"   <> show i
+    | i < 10000 = "0"    <> show i
+    | otherwise =           show i
+
+class HFErrorProject a where
+  eNum :: a -> Int
+  eNum _ = eBase (Proxy :: Proxy a)
+
+  eBase :: Proxy a -> Int
+
+  eDesc :: Proxy a -> String
+
+
     ------------------------
     --[ Low-level errors ]--
     ------------------------
@@ -51,20 +193,32 @@ instance Pretty NoCompatiblePlatform where
   pPrint (NoCompatiblePlatform str') =
     text ("Could not find a compatible platform. Got: " ++ str')
 
+instance HFErrorProject NoCompatiblePlatform where
+  eBase _ = 1
+  eDesc _ = "No compatible platform could be found"
+
 -- | Unable to find a download for the requested version/distro.
 data NoDownload = NoDownload
   deriving Show
 
 instance Pretty NoDownload where
   pPrint NoDownload =
-    text "Unable to find a download for the requested version/distro."
+    text (eDesc (Proxy :: Proxy NoDownload))
+
+instance HFErrorProject NoDownload where
+  eBase _ = 10
+  eDesc _ = "Unable to find a download for the requested version/distro."
 
 -- | No update available or necessary.
 data NoUpdate = NoUpdate
   deriving Show
 
 instance Pretty NoUpdate where
-  pPrint NoUpdate = text "No update available or necessary."
+  pPrint NoUpdate = text (eDesc (Proxy :: Proxy NoUpdate))
+
+instance HFErrorProject NoUpdate where
+  eBase _ = 20
+  eDesc _ = "No update available or necessary."
 
 -- | The Architecture is unknown and unsupported.
 data NoCompatibleArch = NoCompatibleArch String
@@ -74,13 +228,21 @@ instance Pretty NoCompatibleArch where
   pPrint (NoCompatibleArch arch) =
     text ("The Architecture is unknown or unsupported. Got: " ++ arch)
 
+instance HFErrorProject NoCompatibleArch where
+  eBase _ = 30
+  eDesc _ = "The Architecture is unknown and unsupported"
+
 -- | Unable to figure out the distribution of the host.
 data DistroNotFound = DistroNotFound
   deriving Show
 
 instance Pretty DistroNotFound where
   pPrint DistroNotFound =
-    text "Unable to figure out the distribution of the host."
+    text (eDesc (Proxy :: Proxy DistroNotFound))
+
+instance HFErrorProject DistroNotFound where
+  eBase _ = 40
+  eDesc _ = "Unable to figure out the distribution of the host"
 
 -- | The archive format is unknown. We don't know how to extract it.
 data UnknownArchive = UnknownArchive FilePath
@@ -90,12 +252,21 @@ instance Pretty UnknownArchive where
   pPrint (UnknownArchive file) =
     text $ "The archive format is unknown. We don't know how to extract the file " <> file
 
+instance HFErrorProject UnknownArchive where
+  eBase _ = 50
+  eDesc _ = "The archive format is unknown. We don't know how to extract it."
+
 -- | The scheme is not supported (such as ftp).
 data UnsupportedScheme = UnsupportedScheme
   deriving Show
 
 instance Pretty UnsupportedScheme where
-  pPrint UnsupportedScheme = text "The scheme is not supported (such as ftp)."
+  pPrint UnsupportedScheme =
+    text (eDesc (Proxy :: Proxy UnsupportedScheme))
+
+instance HFErrorProject UnsupportedScheme where
+  eBase _ = 60
+  eDesc _ = "The scheme is not supported (such as ftp)."
 
 -- | Unable to copy a file.
 data CopyError = CopyError String
@@ -105,6 +276,10 @@ instance Pretty CopyError where
   pPrint (CopyError reason) =
     text ("Unable to copy a file. Reason was: " ++ reason)
 
+instance HFErrorProject CopyError where
+  eBase _ = 70
+  eDesc _ = "Unable to copy a file."
+
 -- | Unable to merge file trees.
 data MergeFileTreeError = MergeFileTreeError IOException FilePath FilePath
   deriving Show
@@ -114,6 +289,10 @@ instance Pretty MergeFileTreeError where
     text "Failed to merge file tree from" <+> text from <+> text "to" <+> text to <+> text "\nexception was:" <+> text (displayException e)
      <+> text "\n...you may need to delete" <+> text to <+> text "manually. Make sure it's gone."
 
+instance HFErrorProject MergeFileTreeError where
+  eBase _ = 80
+  eDesc _ = "Unable to merge file trees during installation"
+
 -- | Unable to find a tag of a tool.
 data TagNotFound = TagNotFound Tag Tool
   deriving Show
@@ -122,6 +301,10 @@ instance Pretty TagNotFound where
   pPrint (TagNotFound tag tool) =
     text "Unable to find tag" <+> pPrint tag <+> text "of tool" <+> pPrint tool
 
+instance HFErrorProject TagNotFound where
+  eBase _ = 90
+  eDesc _ = "Unable to find a tag of a tool"
+
 -- | Unable to find the next version of a tool (the one after the currently
 -- set one).
 data NextVerNotFound = NextVerNotFound Tool
@@ -131,6 +314,10 @@ instance Pretty NextVerNotFound where
   pPrint (NextVerNotFound tool) =
     text "Unable to find next (the one after the currently set one) version of tool" <+> pPrint tool
 
+instance HFErrorProject NextVerNotFound where
+  eBase _ = 100
+  eDesc _ = "Unable to find the next version of a tool (the one after the currently set one)"
+
 -- | The tool (such as GHC) is already installed with that version.
 data AlreadyInstalled = AlreadyInstalled Tool Version
   deriving Show
@@ -140,6 +327,9 @@ instance Pretty AlreadyInstalled where
     (pPrint tool <> text "-" <> pPrint ver') <+> text "is already installed;"
     <+> text "if you really want to reinstall it, you may want to run 'ghcup install" <+> pPrint tool <+> text "--force" <+> (pPrint ver' <> text "'")
 
+instance HFErrorProject AlreadyInstalled where
+  eBase _ = 110
+  eDesc _ = "The tool (such as GHC) is already installed with that version"
 
 -- | The Directory is supposed to be empty, but wasn't.
 data DirNotEmpty = DirNotEmpty {path :: FilePath}
@@ -149,6 +339,10 @@ instance Pretty DirNotEmpty where
   pPrint (DirNotEmpty path) = do
     text $ "The directory was expected to be empty, but isn't: " <> path
 
+instance HFErrorProject DirNotEmpty where
+  eBase _ = 120
+  eDesc _ = "The Directory is supposed to be empty, but wasn't"
+
 -- | The tool is not installed. Some operations rely on a tool
 -- to be installed (such as setting the current GHC version).
 data NotInstalled = NotInstalled Tool GHCTargetVersion
@@ -158,6 +352,10 @@ instance Pretty NotInstalled where
   pPrint (NotInstalled tool ver) =
     text "The version" <+> pPrint ver <+> text "of the tool" <+> pPrint tool <+> text "is not installed."
 
+instance HFErrorProject NotInstalled where
+  eBase _ = 130
+  eDesc _ = "The required tool is not installed"
+
 data UninstallFailed = UninstallFailed FilePath [FilePath]
   deriving Show
 
@@ -165,6 +363,10 @@ instance Pretty UninstallFailed where
   pPrint (UninstallFailed dir files) =
     text "The following files survived uninstallation: " <+> pPrint files <+> text "...consider removing" <+> pPrint dir <+> text "manually."
 
+instance HFErrorProject UninstallFailed where
+  eBase _ = 140
+  eDesc _ = "Uninstallation failed with leftover files"
+
 -- | An executable was expected to be in PATH, but was not found.
 data NotFoundInPATH = NotFoundInPATH FilePath
   deriving Show
@@ -175,6 +377,10 @@ instance Pretty NotFoundInPATH where
   pPrint (NotFoundInPATH exe) =
     text $ "The exe " <> exe <> " was not found in PATH."
 
+instance HFErrorProject NotFoundInPATH where
+  eBase _ = 150
+  eDesc _ = "An executable was expected to be in PATH, but was not found"
+
 -- | JSON decoding failed.
 data JSONError = JSONDecodeError String
   deriving Show
@@ -183,6 +389,10 @@ instance Pretty JSONError where
   pPrint (JSONDecodeError err) =
     text $ "JSON decoding failed with: " <> err
 
+instance HFErrorProject JSONError where
+  eBase _ = 160
+  eDesc _ = "JSON decoding failed"
+
 -- | A file that is supposed to exist does not exist
 -- (e.g. when we use file scheme to "download" something).
 data FileDoesNotExistError = FileDoesNotExistError FilePath
@@ -192,6 +402,10 @@ instance Pretty FileDoesNotExistError where
   pPrint (FileDoesNotExistError file) =
     text $ "File " <> file <> " does not exist."
 
+instance HFErrorProject FileDoesNotExistError where
+  eBase _ = 170
+  eDesc _ = "A file that is supposed to exist does not exist (oops)"
+
 -- | The file already exists
 -- (e.g. when we use isolated installs with the same path).
 -- (e.g. This is done to prevent any overwriting)
@@ -202,6 +416,10 @@ instance Pretty FileAlreadyExistsError where
   pPrint (FileAlreadyExistsError file) =
     text $ "File " <> file <> " Already exists."
 
+instance HFErrorProject FileAlreadyExistsError where
+  eBase _ = 180
+  eDesc _ = "A file already exists that wasn't expected to exist"
+
 data TarDirDoesNotExist = TarDirDoesNotExist TarDir
   deriving Show
 
@@ -209,6 +427,10 @@ instance Pretty TarDirDoesNotExist where
   pPrint (TarDirDoesNotExist dir) =
     text "Tar directory does not exist:" <+> pPrint dir
 
+instance HFErrorProject TarDirDoesNotExist where
+  eBase _ = 190
+  eDesc _ = "The tar directory (e.g. inside an archive) does not exist"
+
 -- | File digest verification failed.
 data DigestError = DigestError FilePath Text Text
   deriving Show
@@ -219,7 +441,11 @@ instance Pretty DigestError where
       <+> text (T.unpack expectedDigest) <+> text "but got" <+> pPrint currentDigest <+> text
       "\nConsider removing the file in case it's cached and try again."
 
--- | File digest verification failed.
+instance HFErrorProject DigestError where
+  eBase _ = 200
+  eDesc _ = "File digest verification failed"
+
+-- | File PGP verification failed.
 data GPGError = forall xs . (ToVariantMaybe DownloadFailed xs, PopVariant DownloadFailed xs, Show (V xs), Pretty (V xs)) => GPGError (V xs)
 
 deriving instance Show GPGError
@@ -227,6 +453,10 @@ deriving instance Show GPGError
 instance Pretty GPGError where
   pPrint (GPGError reason) = text "GPG verify failed:" <+> pPrint reason
 
+instance HFErrorProject GPGError where
+  eBase _ = 210
+  eDesc _ = "File PGP verification failed"
+
 -- | Unexpected HTTP status.
 data HTTPStatusError = HTTPStatusError Int (M.Map (CI ByteString) ByteString)
   deriving Show
@@ -235,6 +465,10 @@ instance Pretty HTTPStatusError where
   pPrint (HTTPStatusError status _) =
     text "Unexpected HTTP status:" <+> pPrint status
 
+instance HFErrorProject HTTPStatusError where
+  eBase _ = 220
+  eDesc _ = "Unexpected HTTP status error (e.g. during downloads)"
+
 -- | Malformed headers.
 data MalformedHeaders = MalformedHeaders Text
   deriving Show
@@ -243,6 +477,10 @@ instance Pretty MalformedHeaders where
   pPrint (MalformedHeaders h) =
     text "Headers are malformed: " <+> pPrint h
 
+instance HFErrorProject MalformedHeaders where
+  eBase _ = 230
+  eDesc _ = "Malformed headers during download"
+
 -- | Unexpected HTTP status.
 data HTTPNotModified = HTTPNotModified Text
   deriving Show
@@ -251,13 +489,21 @@ instance Pretty HTTPNotModified where
   pPrint (HTTPNotModified etag) =
     text "Remote resource not modifed, etag was:" <+> pPrint etag
 
+instance HFErrorProject HTTPNotModified where
+  eBase _ = 240
+  eDesc _ = "Not modified HTTP status error (e.g. during downloads)."
+
 -- | The 'Location' header was expected during a 3xx redirect, but not found.
 data NoLocationHeader = NoLocationHeader
   deriving Show
 
 instance Pretty NoLocationHeader where
   pPrint NoLocationHeader =
-    text "The 'Location' header was expected during a 3xx redirect, but not found."
+    text (eDesc (Proxy :: Proxy NoLocationHeader))
+
+instance HFErrorProject NoLocationHeader where
+  eBase _ = 250
+  eDesc _ = "The 'Location' header was expected during a 3xx redirect, but not found."
 
 -- | Too many redirects.
 data TooManyRedirs = TooManyRedirs
@@ -265,7 +511,11 @@ data TooManyRedirs = TooManyRedirs
 
 instance Pretty TooManyRedirs where
   pPrint TooManyRedirs =
-    text "Too many redirections."
+    text (eDesc (Proxy :: Proxy TooManyRedirs))
+
+instance HFErrorProject TooManyRedirs where
+  eBase _ = 260
+  eDesc _ = "Too many redirections."
 
 -- | A patch could not be applied.
 data PatchFailed = PatchFailed
@@ -273,7 +523,11 @@ data PatchFailed = PatchFailed
 
 instance Pretty PatchFailed where
   pPrint PatchFailed =
-    text "A patch could not be applied."
+    text (eDesc (Proxy :: Proxy PatchFailed))
+
+instance HFErrorProject PatchFailed where
+  eBase _ = 270
+  eDesc _ = "A patch could not be applied."
 
 -- | The tool requirements could not be found.
 data NoToolRequirements = NoToolRequirements
@@ -281,7 +535,11 @@ data NoToolRequirements = NoToolRequirements
 
 instance Pretty NoToolRequirements where
   pPrint NoToolRequirements =
-    text "The Tool requirements could not be found."
+    text (eDesc (Proxy :: Proxy NoToolRequirements))
+
+instance HFErrorProject NoToolRequirements where
+  eBase _ = 280
+  eDesc _ = "The Tool requirements could not be found."
 
 data InvalidBuildConfig = InvalidBuildConfig Text
   deriving Show
@@ -290,6 +548,10 @@ instance Pretty InvalidBuildConfig where
   pPrint (InvalidBuildConfig reason) =
     text "The build config is invalid. Reason was:" <+> pPrint reason
 
+instance HFErrorProject InvalidBuildConfig where
+  eBase _ = 290
+  eDesc _ = "The build config is invalid."
+
 data NoToolVersionSet = NoToolVersionSet Tool
   deriving Show
 
@@ -297,19 +559,31 @@ instance Pretty NoToolVersionSet where
   pPrint (NoToolVersionSet tool) =
     text "No version is set for tool" <+> pPrint tool <+> text "."
 
+instance HFErrorProject NoToolVersionSet where
+  eBase _ = 300
+  eDesc _ = "No version is set for tool (but was expected)."
+
 data NoNetwork = NoNetwork
   deriving Show
 
 instance Pretty NoNetwork where
   pPrint NoNetwork =
-    text "A download was required or requested, but '--offline' was specified."
+    text (eDesc (Proxy :: Proxy NoNetwork))
+
+instance HFErrorProject NoNetwork where
+  eBase _ = 310
+  eDesc _ = "A download was required or requested, but '--offline' was specified."
 
 data HadrianNotFound = HadrianNotFound
   deriving Show
 
 instance Pretty HadrianNotFound where
   pPrint HadrianNotFound =
-    text "Could not find Hadrian build files. Does this GHC version support Hadrian builds?"
+    text (eDesc (Proxy :: Proxy HadrianNotFound))
+
+instance HFErrorProject HadrianNotFound where
+  eBase _ = 320
+  eDesc _ = "Could not find Hadrian build files. Does this GHC version support Hadrian builds?"
 
 data ToolShadowed = ToolShadowed
                        Tool
@@ -332,12 +606,43 @@ instance Pretty ToolShadowed where
          <> " in PATH."
          )
 
+instance HFErrorProject ToolShadowed where
+  eBase _ = 330
+  eDesc _ = "A tool is shadowed in PATH."
+
+-- | File content length verification failed.
+data ContentLengthError = ContentLengthError (Maybe FilePath) (Maybe Integer) Integer
+  deriving Show
+
+instance Pretty ContentLengthError where
+  pPrint (ContentLengthError Nothing Nothing expectedSize) =
+    text "Content length exceeded expected size:"
+      <+> text (show expectedSize)
+      <+> text "\nConsider removing the file in case it's cached and try again."
+  pPrint (ContentLengthError Nothing (Just currentSize) expectedSize) =
+    text "Content length error. Expected"
+      <+> text (show expectedSize) <+> text "but got" <+> pPrint currentSize <+> text
+      "\nConsider removing the file in case it's cached and try again."
+  pPrint (ContentLengthError (Just fp) (Just currentSize) expectedSize) =
+    text "Content length error for" <+> text (fp <> ": expected")
+      <+> text (show expectedSize) <+> text "but got" <+> pPrint currentSize <+> text
+      "\nConsider removing the file in case it's cached and try again."
+  pPrint (ContentLengthError (Just fp) Nothing expectedSize) =
+    text "Content length error for" <+> text (fp <> ": expected")
+      <+> text (show expectedSize) <+> text "\nConsider removing the file in case it's cached and try again."
+
+instance Exception ContentLengthError
+
+instance HFErrorProject ContentLengthError where
+  eBase _ = 340
+  eDesc _ = "File content length verification failed"
+
     -------------------------
     --[ High-level errors ]--
     -------------------------
 
 -- | A download failed. The underlying error is encapsulated.
-data DownloadFailed = forall xs . (ToVariantMaybe DownloadFailed xs, PopVariant DownloadFailed xs, Show (V xs), Pretty (V xs)) => DownloadFailed (V xs)
+data DownloadFailed = forall xs . (HFErrorProject (V xs), ToVariantMaybe DownloadFailed xs, PopVariant DownloadFailed xs, Show (V xs), Pretty (V xs)) => DownloadFailed (V xs)
 
 instance Pretty DownloadFailed where
   pPrint (DownloadFailed reason) =
@@ -347,7 +652,12 @@ instance Pretty DownloadFailed where
 
 deriving instance Show DownloadFailed
 
-data InstallSetError = forall xs1 xs2 . (Show (V xs1), Pretty (V xs1), Show (V xs2), Pretty (V xs2)) => InstallSetError (V xs1) (V xs2)
+instance HFErrorProject DownloadFailed where
+  eBase _ = 5000
+  eNum (DownloadFailed xs) = 5000 + eNum xs
+  eDesc _ = "A download failed."
+
+data InstallSetError = forall xs1 xs2 . (Show (V xs1), Pretty (V xs1), HFErrorProject (V xs1), Show (V xs2), Pretty (V xs2), HFErrorProject (V xs2)) => InstallSetError (V xs1) (V xs2)
 
 instance Pretty InstallSetError where
   pPrint (InstallSetError reason1 reason2) =
@@ -358,9 +668,15 @@ instance Pretty InstallSetError where
 
 deriving instance Show InstallSetError
 
+instance HFErrorProject InstallSetError where
+  eBase _ = 7000
+  -- will there be collisions?
+  eNum (InstallSetError xs1 xs2) = 7000 + eNum xs1 + eNum xs2
+  eDesc _ = "Installation or setting the tool failed."
+
 
 -- | A build failed.
-data BuildFailed = forall es . (ToVariantMaybe BuildFailed es, PopVariant BuildFailed es, Pretty (V es), Show (V es)) => BuildFailed FilePath (V es)
+data BuildFailed = forall es . (ToVariantMaybe BuildFailed es, PopVariant BuildFailed es, Pretty (V es), Show (V es), HFErrorProject (V es)) => BuildFailed FilePath (V es)
 
 instance Pretty BuildFailed where
   pPrint (BuildFailed path reason) =
@@ -370,18 +686,28 @@ instance Pretty BuildFailed where
 
 deriving instance Show BuildFailed
 
+instance HFErrorProject BuildFailed where
+  eBase _ = 8000
+  eNum (BuildFailed _ xs2) = 8000 + eNum xs2
+  eDesc _ = "The build failed."
+
 
 -- | Setting the current GHC version failed.
-data GHCupSetError = forall es . (ToVariantMaybe GHCupSetError es, PopVariant GHCupSetError es, Show (V es), Pretty (V es)) => GHCupSetError (V es)
+data GHCupSetError = forall es . (ToVariantMaybe GHCupSetError es, PopVariant GHCupSetError es, Show (V es), Pretty (V es), HFErrorProject (V es)) => GHCupSetError (V es)
 
 instance Pretty GHCupSetError where
   pPrint (GHCupSetError reason) =
     case reason of
       VMaybe (_ :: GHCupSetError) -> pPrint reason
-      _ -> text "Setting the current GHC version failed:" <+> pPrint reason
+      _ -> text "Setting the current version failed:" <+> pPrint reason
 
 deriving instance Show GHCupSetError
 
+instance HFErrorProject GHCupSetError where
+  eBase _ = 9000
+  eNum (GHCupSetError xs) = 9000 + eNum xs
+  eDesc _ = "Setting the current version failed."
+
 
     ---------------------------------------------
     --[ True Exceptions (e.g. for MonadThrow) ]--
@@ -398,6 +724,10 @@ instance Pretty ParseError where
 
 instance Exception ParseError
 
+instance HFErrorProject ParseError where
+  eBase _ = 500
+  eDesc _ = "A parse error occured."
+
 
 data UnexpectedListLength = UnexpectedListLength String
   deriving Show
@@ -408,6 +738,10 @@ instance Pretty UnexpectedListLength where
 
 instance Exception UnexpectedListLength
 
+instance HFErrorProject UnexpectedListLength where
+  eBase _ = 510
+  eDesc _ = "A list had an unexpected length."
+
 data NoUrlBase = NoUrlBase Text
   deriving Show
 
@@ -417,6 +751,10 @@ instance Pretty NoUrlBase where
 
 instance Exception NoUrlBase
 
+instance HFErrorProject NoUrlBase where
+  eBase _ = 520
+  eDesc _ = "URL does not have a base filename."
+
 
 
     ------------------------
@@ -436,6 +774,23 @@ instance
          Right x -> pPrint x
          Left xs -> pPrint xs
 
+instance HFErrorProject (V '[]) where
+   {-# INLINABLE eBase #-}
+   eBase _ = undefined
+   {-# INLINABLE eDesc #-}
+   eDesc _ = undefined
+
+instance
+   ( HFErrorProject x
+   , HFErrorProject (V xs)
+   ) => HFErrorProject (V (x ': xs))
+   where
+      eNum v = case popVariantHead v of
+         Right x -> eNum x
+         Left xs -> eNum xs
+      eDesc _ = undefined
+      eBase _ = undefined
+
 instance Pretty URIParseError where
   pPrint (MalformedScheme reason) =
     text "Failed to parse URI. Malformed scheme:" <+> text (show reason)
@@ -454,6 +809,22 @@ instance Pretty URIParseError where
   pPrint (OtherError err) =
     text "Failed to parse URI:" <+> pPrint err
 
+instance HFErrorProject URIParseError where
+  eBase _ = 800
+
+  eNum (MalformedScheme NonAlphaLeading) = 801
+  eNum (MalformedScheme InvalidChars) = 802
+  eNum (MalformedScheme MissingColon) = 803
+  eNum MalformedUserInfo   = 804
+  eNum MalformedQuery      = 805
+  eNum MalformedFragment   = 806
+  eNum MalformedHost       = 807
+  eNum MalformedPort       = 808
+  eNum MalformedPath       = 809
+  eNum (OtherError _)      = 810
+
+  eDesc _ = "Failed to parse URI."
+
 instance Pretty ArchiveResult where
   pPrint ArchiveFatal = text "Archive result: fatal"
   pPrint ArchiveFailed = text "Archive result: failed"
@@ -462,5 +833,37 @@ instance Pretty ArchiveResult where
   pPrint ArchiveOk = text "Archive result: Ok"
   pPrint ArchiveEOF = text "Archive result: EOF"
 
+instance HFErrorProject ArchiveResult where
+  eBase _ = 820
+
+  eNum ArchiveFatal  = 821
+  eNum ArchiveFailed = 822
+  eNum ArchiveWarn   = 823
+  eNum ArchiveRetry  = 824
+  eNum ArchiveOk     = 825
+  eNum ArchiveEOF    = 826
+
+  eDesc _ = "Archive extraction result."
+
 instance Pretty T.Text where
   pPrint = text . T.unpack
+
+instance Pretty ProcessError where
+  pPrint (NonZeroExit e exe args) =
+    text "Process" <+> pPrint exe <+> text "with arguments" <+> pPrint args <+> text "failed with exit code" <+> text (show e <> ".")
+  pPrint (PTerminated exe args) =
+    text "Process" <+> pPrint exe <+> text "with arguments" <+> pPrint args <+> text "terminated."
+  pPrint (PStopped exe args) =
+    text "Process" <+> pPrint exe <+> text "with arguments" <+> pPrint args <+> text "stopped."
+  pPrint (NoSuchPid exe args) =
+    text "Could not find PID for process running " <+> pPrint exe <+> text " with arguments " <+> text (show args) <+> text "."
+
+instance HFErrorProject ProcessError where
+  eBase _ = 840
+
+  eNum NonZeroExit{}     = 841
+  eNum (PTerminated _ _) = 842
+  eNum (PStopped _ _)    = 843
+  eNum (NoSuchPid _ _)   = 844
+
+  eDesc _ = "A process exited prematurely."

lib/GHCup/GHC.hs

@@ -109,6 +109,7 @@ fetchGHCSrc :: ( MonadFail m
             -> Maybe FilePath
             -> Excepts
                  '[ DigestError
+                  , ContentLengthError
                   , GPGError
                   , DownloadFailed
                   , NoDownload
@@ -152,6 +153,7 @@ installGHCBindist :: ( MonadFail m
                        '[ AlreadyInstalled
                         , BuildFailed
                         , DigestError
+                        , ContentLengthError
                         , GPGError
                         , DownloadFailed
                         , NoDownload
@@ -357,6 +359,7 @@ installGHCBin :: ( MonadFail m
                    '[ AlreadyInstalled
                     , BuildFailed
                     , DigestError
+                    , ContentLengthError
                     , GPGError
                     , DownloadFailed
                     , NoDownload
@@ -456,7 +459,7 @@ setGHC ver sghc mBinDir = do
       when (targetFile == "ghc") $
         liftIO (isShadowed fullF) >>= \case
           Nothing -> pure ()
-          Just pa -> lift $ logWarn $ T.pack $ prettyShow (ToolShadowed GHC pa fullF (_tvVersion ver))
+          Just pa -> lift $ logWarn $ T.pack $ prettyHFError (ToolShadowed GHC pa fullF (_tvVersion ver))
 
   when (isNothing mBinDir) $ do
     -- create symlink for share dir
@@ -628,6 +631,7 @@ compileGHC :: ( MonadMask m
                 '[ AlreadyInstalled
                  , BuildFailed
                  , DigestError
+                 , ContentLengthError
                  , GPGError
                  , DownloadFailed
                  , GHCupSetError
@@ -676,7 +680,7 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
                          (view dlSubdir dlInfo)
         liftE $ applyAnyPatch patches (fromGHCupPath workdir)
 
-        pure (workdir, tmpUnpack, tver)
+        pure (workdir, tmpUnpack, Just tver)
 
       RemoteDist uri -> do
         lift $ logDebug $ "Requested to compile (from uri): " <> T.pack (show uri)
@@ -684,7 +688,7 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
         -- download source tarball
         tmpDownload <- lift withGHCupTmpDir
         tmpUnpack <- lift mkGhcupTmpDir
-        tar <- liftE $ download uri Nothing Nothing (fromGHCupPath tmpDownload) Nothing False
+        tar <- liftE $ download uri Nothing Nothing Nothing (fromGHCupPath tmpDownload) Nothing False
         (bf, tver) <- liftE $ cleanUpOnError @'[UnknownArchive, ArchiveResult, ProcessError] tmpUnpack $ do
           liftE $ unpackToDir (fromGHCupPath tmpUnpack) tar
           let regex = [s|^(.*/)*boot$|] :: B.ByteString
@@ -694,18 +698,19 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
                            execBlank
                            regex
             )
-          tver <- liftE $ getGHCVer (appendGHCupPath tmpUnpack (takeDirectory bootFile))
+          tver <- liftE $ catchAllE @_ @'[ProcessError, ParseError] @'[] (\_ -> pure Nothing) $ fmap Just $ getGHCVer
+            (appendGHCupPath tmpUnpack (takeDirectory bootFile))
           pure (bootFile, tver)
 
         let workdir = appendGHCupPath tmpUnpack (takeDirectory bf)
 
-        pure (workdir, tmpUnpack, mkTVer tver)
+        pure (workdir, tmpUnpack, mkTVer <$> tver)
 
       -- clone from git
       GitDist GitBranch{..} -> do
         tmpUnpack <- lift mkGhcupTmpDir
         let git args = execLogged "git" ("--no-pager":args) (Just $ fromGHCupPath tmpUnpack) "git" Nothing
-        tver <- reThrowAll @_ @'[PatchFailed, ProcessError, NotFoundInPATH, DigestError, DownloadFailed, GPGError] DownloadFailed $ do
+        tver <- reThrowAll @_ @'[PatchFailed, ProcessError, NotFoundInPATH, DigestError, ContentLengthError, DownloadFailed, GPGError] DownloadFailed $ do
           let rep = fromMaybe "https://gitlab.haskell.org/ghc/ghc.git" repo
           lift $ logInfo $ "Fetching git repo " <> T.pack rep <> " at ref " <> T.pack ref <> " (this may take a while)"
           lEM $ git [ "init" ]
@@ -715,7 +720,7 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
                     , fromString rep ]
 
           -- figure out if we can do a shallow clone
-          remoteBranches <- catchE @ProcessError @'[PatchFailed, ProcessError, NotFoundInPATH, DigestError, DownloadFailed, GPGError] @'[PatchFailed, NotFoundInPATH, DigestError, DownloadFailed, GPGError] (\(_ :: ProcessError) -> pure [])
+          remoteBranches <- catchE @ProcessError @'[PatchFailed, ProcessError, NotFoundInPATH, DigestError, ContentLengthError, DownloadFailed, GPGError] @'[PatchFailed, NotFoundInPATH, DigestError, DownloadFailed, GPGError] (\(_ :: ProcessError) -> pure [])
               $ fmap processBranches $ gitOut ["ls-remote", "--heads", "origin"] (fromGHCupPath tmpUnpack)
           let shallow_clone
                 | isCommitHash ref                     = True
@@ -745,20 +750,23 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
           liftE $ applyAnyPatch patches (fromGHCupPath tmpUnpack)
 
           -- bootstrap
-          tver <- liftE $ getGHCVer tmpUnpack
+          tver <- liftE $ catchAllE @_ @'[ProcessError, ParseError] @'[] (\_ -> pure Nothing) $ fmap Just $ getGHCVer
+            tmpUnpack
           liftE $ catchWarn $ lEM @_ @'[ProcessError] $ darwinNotarization _rPlatform (fromGHCupPath tmpUnpack)
           lift $ logInfo $ "Examining git ref " <> T.pack ref <> "\n  " <>
-                           "GHC version (from Makefile): " <> prettyVer tver <>
+                           "GHC version (from Makefile): " <> T.pack (show (prettyVer <$> tver)) <>
                            (if not shallow_clone then "\n  " <> "'git describe' output: " <> fromJust git_describe else mempty) <>
                            (if isCommitHash ref then mempty else "\n  " <> "commit hash: " <> chash)
           liftIO $ threadDelay 5000000 -- give the user a sec to intervene
 
           pure tver
 
-        pure (tmpUnpack, tmpUnpack, GHCTargetVersion Nothing tver)
+        pure (tmpUnpack, tmpUnpack, mkTVer <$> 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
+    installVer <- if | Just ov'   <- ov   -> pure (mkTVer ov')
+                     | Just tver' <- tver -> pure tver'
+                     | otherwise          -> fail "Newer GHCs don't support discovering the version in git. Complain to GHC devs: https://gitlab.haskell.org/ghc/ghc/-/issues/22322"
 
     alreadyInstalled <- lift $ ghcInstalled installVer
     alreadySet <- fmap (== Just installVer) $ lift $ ghcSet (_tvTarget installVer)
@@ -781,8 +789,10 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
       tmpUnpack
       (do
         b <- if hadrian
-             then compileHadrianBindist tver (fromGHCupPath workdir) ghcdir
+             -- prefer 'tver', because the real version carries out compatibility checks
-             else compileMakeBindist tver (fromGHCupPath workdir) ghcdir
+             -- we don't want the user to do funny things with it
+             then compileHadrianBindist (fromMaybe installVer tver) (fromGHCupPath workdir) ghcdir
+             else compileMakeBindist (fromMaybe installVer tver) (fromGHCupPath workdir) ghcdir
         bmk <- liftIO $ handleIO (\_ -> pure "") $ B.readFile (build_mk $ fromGHCupPath workdir)
         pure (b, bmk)
       )
@@ -826,14 +836,14 @@ compileGHC targetGhc ov bstrap jobs mbuildConfig patches aargs buildFlavour hadr
                , MonadThrow m
                )
             => GHCupPath
-            -> Excepts '[ProcessError] m Version
+            -> Excepts '[ProcessError, ParseError] m Version
   getGHCVer tmpUnpack = do
     lEM $ execWithGhcEnv "python3" ["./boot"] (Just $ fromGHCupPath tmpUnpack) "ghc-bootstrap"
     lEM $ execWithGhcEnv "sh" ["./configure"] (Just $ fromGHCupPath tmpUnpack) "ghc-bootstrap"
     CapturedProcess {..} <- lift $ makeOut
       ["show!", "--quiet", "VALUE=ProjectVersion" ] (Just $ fromGHCupPath tmpUnpack)
     case _exitCode of
-      ExitSuccess -> throwEither . MP.parse ghcProjectVersion "" . T.pack . stripNewlineEnd . T.unpack . decUTF8Safe' $ _stdOut
+      ExitSuccess -> either (throwE . ParseError . show) pure . MP.parse ghcProjectVersion "" . T.pack . stripNewlineEnd . T.unpack . decUTF8Safe' $ _stdOut
       ExitFailure c -> throwE $ NonZeroExit c "make" ["show!", "--quiet", "VALUE=ProjectVersion" ]
 
   defaultConf =

lib/GHCup/HLS.hs

@@ -68,7 +68,6 @@ import qualified Data.List.NonEmpty            as NE
 import qualified Data.ByteString               as B
 import qualified Data.Text                     as T
 import qualified Text.Megaparsec               as MP
-import Text.PrettyPrint.HughesPJClass (prettyShow)
 
 
 data HLSVer = SourceDist Version
@@ -105,6 +104,7 @@ installHLSBindist :: ( MonadMask m
                        '[ AlreadyInstalled
                         , CopyError
                         , DigestError
+                        , ContentLengthError
                         , GPGError
                         , DownloadFailed
                         , NoDownload
@@ -297,6 +297,7 @@ installHLSBin :: ( MonadMask m
                    '[ AlreadyInstalled
                     , CopyError
                     , DigestError
+                    , ContentLengthError
                     , GPGError
                     , DownloadFailed
                     , NoDownload
@@ -344,6 +345,7 @@ compileHLS :: ( MonadMask m
                        , GPGError
                        , DownloadFailed
                        , DigestError
+                       , ContentLengthError
                        , UnknownArchive
                        , TarDirDoesNotExist
                        , ArchiveResult
@@ -401,7 +403,7 @@ compileHLS targetHLS ghcs jobs ov installDir cabalProject cabalProjectLocal upda
       -- download source tarball
       tmpDownload <- lift withGHCupTmpDir
       tmpUnpack <- lift mkGhcupTmpDir
-      tar <- liftE $ download uri Nothing Nothing (fromGHCupPath tmpDownload) Nothing False
+      tar <- liftE $ download uri Nothing Nothing Nothing (fromGHCupPath tmpDownload) Nothing False
       (cf, tver) <- liftE $ cleanUpOnError tmpUnpack $ do
         unpackToDir (fromGHCupPath tmpUnpack) tar
         let regex = [s|^(.*/)*haskell-language-server\.cabal$|] :: B.ByteString
@@ -481,7 +483,7 @@ compileHLS targetHLS ghcs jobs ov installDir cabalProject cabalProjectLocal upda
 
   liftE $ runBuildAction
     tmpUnpack
-    (reThrowAll @_ @'[GPGError, DownloadFailed, DigestError, PatchFailed, ProcessError, FileAlreadyExistsError, CopyError] @'[BuildFailed] (BuildFailed $ fromGHCupPath workdir) $ do
+    (reThrowAll @_ @'[GPGError, DownloadFailed, DigestError, ContentLengthError, PatchFailed, ProcessError, FileAlreadyExistsError, CopyError] @'[BuildFailed] (BuildFailed $ fromGHCupPath workdir) $ do
       let tmpInstallDir = fromGHCupPath workdir </> "out"
       liftIO $ createDirRecursive' tmpInstallDir
 
@@ -497,7 +499,7 @@ compileHLS targetHLS ghcs jobs ov installDir cabalProject cabalProjectLocal upda
           | otherwise -> pure (takeFileName cp)
         Just (Right uri) -> do
           tmpUnpack' <- lift withGHCupTmpDir
-          cp <- liftE $ download uri Nothing Nothing (fromGHCupPath tmpUnpack') (Just "cabal.project") False
+          cp <- liftE $ download uri Nothing Nothing Nothing (fromGHCupPath tmpUnpack') (Just "cabal.project") False
           copyFileE cp (fromGHCupPath workdir </> "cabal.project") False
           pure "cabal.project"
         Nothing
@@ -511,7 +513,7 @@ compileHLS targetHLS ghcs jobs ov installDir cabalProject cabalProjectLocal upda
           | otherwise -> pure "cabal.project"
       forM_ cabalProjectLocal $ \uri -> do
         tmpUnpack' <- lift withGHCupTmpDir
-        cpl <- liftE $ download uri Nothing Nothing (fromGHCupPath tmpUnpack') (Just (cp <.> "local")) False
+        cpl <- liftE $ download uri Nothing Nothing Nothing (fromGHCupPath tmpUnpack') (Just (cp <.> "local")) False
         copyFileE cpl (fromGHCupPath workdir </> cp <.> "local") False
       artifacts <- forM (sort ghcs) $ \ghc -> do
         let ghcInstallDir = tmpInstallDir </> T.unpack (prettyVer ghc)
@@ -631,7 +633,7 @@ setHLS ver shls mBinDir = do
 
       liftIO (isShadowed wrapper) >>= \case
         Nothing -> pure ()
-        Just pa -> lift $ logWarn $ T.pack $ prettyShow (ToolShadowed HLS pa wrapper ver)
+        Just pa -> lift $ logWarn $ T.pack $ prettyHFError (ToolShadowed HLS pa wrapper ver)
 
 
 unsetHLS :: ( MonadMask m

lib/GHCup/Prelude.hs

@@ -41,24 +41,26 @@ import GHCup.Prelude.Posix
 import           Control.Monad.IO.Class
 import           Control.Monad.Reader
 import           Haskus.Utils.Variant.Excepts
-import           Text.PrettyPrint.HughesPJClass ( prettyShow, Pretty )
+import           Text.PrettyPrint.HughesPJClass ( Pretty )
 import qualified Data.Text                     as T
 
 
 
 -- for some obscure reason... this won't type-check if we move it to a different module
 catchWarn :: forall es m env . ( Pretty (V es)
+                             , HFErrorProject (V es)
                              , MonadReader env m
                              , HasLog env
                              , MonadIO m
                              , Monad m) => Excepts es m () -> Excepts '[] m ()
-catchWarn = catchAllE @_ @es (\v -> lift $ logWarn (T.pack . prettyShow $ v))
+catchWarn = catchAllE @_ @es (\v -> lift $ logWarn (T.pack . prettyHFError $ v))
 
 
 runBothE' :: forall e m a b .
              ( Monad m
              , Show (V e)
              , Pretty (V e)
+             , HFErrorProject (V e)
              , PopVariant InstallSetError e
              , LiftVariant' e (InstallSetError ': e)
              , e :<< (InstallSetError ': e)

lib/GHCup/Prelude/File/Posix.hs

@@ -48,6 +48,7 @@ import           Streamly.Internal.Data.Unfold.Type
 import qualified Streamly.Internal.Data.Unfold as U
 import           Streamly.Internal.Control.Concurrent ( withRunInIO )
 import           Streamly.Internal.Data.IOFinalizer   ( newIOFinalizer, runIOFinalizer )
+import GHC.IO.Exception (IOException(ioe_type), IOErrorType (..))
 
 
 -- | On unix, we can use symlinks, so we just get the
@@ -116,8 +117,18 @@ copyFile from to fail' = do
         let dflags = [ FD.oNofollow
                      , if fail' then FD.oExcl else FD.oTrunc
                      ]
+        let openFdHandle' = openFdHandle to SPI.WriteOnly dflags $ Just sourceFileMode
         bracket
-          (openFdHandle to SPI.WriteOnly dflags $ Just sourceFileMode)
+          (handleIO (\e -> if
+                              -- if we copy from regular file to symlink, we need
+                              -- to delete the symlink
+                              | ioe_type e == InvalidArgument
+                              , not fail' -> do
+                                 removeLink to
+                                 openFdHandle'
+                              | otherwise -> throwIO e
+                    )
+            openFdHandle')
           (hClose . snd)
           $ \(_, tH) -> do
               hSetBinaryMode fH True

lib/GHCup/Stack.hs

@@ -50,7 +50,6 @@ import           System.FilePath
 import           System.IO.Error
 
 import qualified Data.Text                     as T
-import Text.PrettyPrint.HughesPJClass (prettyShow)
 
 
 
@@ -82,6 +81,7 @@ installStackBin :: ( MonadMask m
                      '[ AlreadyInstalled
                       , CopyError
                       , DigestError
+                      , ContentLengthError
                       , GPGError
                       , DownloadFailed
                       , NoDownload
@@ -120,6 +120,7 @@ installStackBindist :: ( MonadMask m
                          '[ AlreadyInstalled
                           , CopyError
                           , DigestError
+                          , ContentLengthError
                           , GPGError
                           , DownloadFailed
                           , NoDownload
@@ -232,7 +233,7 @@ setStack ver = do
 
   liftIO (isShadowed stackbin) >>= \case
     Nothing -> pure ()
-    Just pa -> lift $ logWarn $ T.pack $ prettyShow (ToolShadowed Cabal pa stackbin ver)
+    Just pa -> lift $ logWarn $ T.pack $ prettyHFError (ToolShadowed Cabal pa stackbin ver)
 
   pure ()
 

lib/GHCup/Types.hs

@@ -35,7 +35,7 @@ import           Data.Text                      ( Text )
 import           Data.Versions
 import           GHC.IO.Exception               ( ExitCode )
 import           Optics                         ( makeLenses )
-import           Text.PrettyPrint.HughesPJClass (Pretty, pPrint, text, (<+>))
+import           Text.PrettyPrint.HughesPJClass (Pretty, pPrint, text)
 import           URI.ByteString
 #if defined(BRICK)
 import           Graphics.Vty                   ( Key(..) )
@@ -262,6 +262,7 @@ data DownloadInfo = DownloadInfo
   { _dlUri    :: URI
   , _dlSubdir :: Maybe TarDir
   , _dlHash   :: Text
+  , _dlCSize  :: Maybe Integer
   }
   deriving (Eq, Ord, GHC.Generic, Show)
 
@@ -297,10 +298,16 @@ instance NFData URLSource
 instance NFData (URIRef Absolute) where
   rnf (URI !_ !_ !_ !_ !_) = ()
 
+data MetaMode = Strict
+              | Lax
+  deriving (Show, Read, Eq, GHC.Generic)
+
+instance NFData MetaMode
 
 data UserSettings = UserSettings
   { uCache       :: Maybe Bool
   , uMetaCache   :: Maybe Integer
+  , uMetaMode    :: Maybe MetaMode
   , uNoVerify    :: Maybe Bool
   , uVerbose     :: Maybe Bool
   , uKeepDirs    :: Maybe KeepDirs
@@ -314,13 +321,14 @@ data UserSettings = UserSettings
   deriving (Show, GHC.Generic)
 
 defaultUserSettings :: UserSettings
-defaultUserSettings = UserSettings Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing
+defaultUserSettings = UserSettings Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing Nothing
 
 fromSettings :: Settings -> Maybe KeyBindings -> UserSettings
 fromSettings Settings{..} Nothing =
   UserSettings {
       uCache = Just cache
     , uMetaCache = Just metaCache
+    , uMetaMode = Just metaMode
     , uNoVerify = Just noVerify
     , uVerbose = Just verbose
     , uKeepDirs = Just keepDirs
@@ -346,6 +354,7 @@ fromSettings Settings{..} (Just KeyBindings{..}) =
   in UserSettings {
       uCache = Just cache
     , uMetaCache = Just metaCache
+    , uMetaMode = Just metaMode
     , uNoVerify = Just noVerify
     , uVerbose = Just verbose
     , uKeepDirs = Just keepDirs
@@ -426,6 +435,7 @@ instance NFData LeanAppState
 data Settings = Settings
   { cache            :: Bool
   , metaCache        :: Integer
+  , metaMode         :: MetaMode
   , noVerify         :: Bool
   , keepDirs         :: KeepDirs
   , downloader       :: Downloader
@@ -442,7 +452,7 @@ defaultMetaCache :: Integer
 defaultMetaCache = 300 -- 5 minutes
 
 defaultSettings :: Settings
-defaultSettings = Settings False defaultMetaCache False Never Curl False GHCupURL False GPGNone False Nothing
+defaultSettings = Settings False defaultMetaCache Lax False Never Curl False GHCupURL False GPGNone False Nothing
 
 instance NFData Settings
 
@@ -622,15 +632,7 @@ data ProcessError = NonZeroExit Int FilePath [String]
                   | NoSuchPid FilePath [String]
                   deriving Show
 
-instance Pretty ProcessError where
+
-  pPrint (NonZeroExit e exe args) =
-    text "Process" <+> pPrint exe <+> text "with arguments" <+> pPrint args <+> text "failed with exit code" <+> text (show e <> ".")
-  pPrint (PTerminated exe args) =
-    text "Process" <+> pPrint exe <+> text "with arguments" <+> pPrint args <+> text "terminated."
-  pPrint (PStopped exe args) =
-    text "Process" <+> pPrint exe <+> text "with arguments" <+> pPrint args <+> text "stopped."
-  pPrint (NoSuchPid exe args) =
-    text "Could not find PID for process running " <+> pPrint exe <+> text " with arguments " <+> text (show args) <+> text "."
 data CapturedProcess = CapturedProcess
   { _exitCode :: ExitCode
   , _stdOut   :: BL.ByteString

lib/GHCup/Types/JSON.hs

@@ -43,6 +43,7 @@ import qualified Text.Megaparsec               as MP
 import qualified Text.Megaparsec.Char          as MPC
 
 
+deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''MetaMode
 deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''Architecture
 deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''LinuxDistro
 deriveJSON defaultOptions { fieldLabelModifier = removeLensFieldLabel } ''VSep

lib/GHCup/Utils.hs

@@ -1035,13 +1035,13 @@ applyAnyPatch :: ( MonadReader env m
                  , MonadIO m)
               => Maybe (Either FilePath [URI])
               -> FilePath
-              -> Excepts '[PatchFailed, DownloadFailed, DigestError, GPGError] m ()
+              -> Excepts '[PatchFailed, DownloadFailed, DigestError, ContentLengthError, GPGError] m ()
 applyAnyPatch Nothing _                   = pure ()
 applyAnyPatch (Just (Left pdir)) workdir  = liftE $ applyPatches pdir workdir
 applyAnyPatch (Just (Right uris)) workdir = do
   tmpUnpack <- fromGHCupPath <$> lift withGHCupTmpDir
   forM_ uris $ \uri -> do
-    patch <- liftE $ download uri Nothing Nothing tmpUnpack Nothing False
+    patch <- liftE $ download uri Nothing Nothing Nothing tmpUnpack Nothing False
     liftE $ applyPatch patch workdir
 
 
@@ -1172,7 +1172,7 @@ ensureGlobalTools :: ( MonadMask m
                      , MonadUnliftIO m
                      , MonadFail m
                      )
-                  => Excepts '[GPGError, DigestError , DownloadFailed, NoDownload] m ()
+                  => Excepts '[GPGError, DigestError, ContentLengthError, DownloadFailed, NoDownload] m ()
 ensureGlobalTools
   | isWindows = do
       (GHCupInfo _ _ gTools) <- lift getGHCupInfo
@@ -1184,8 +1184,8 @@ ensureGlobalTools
           lift $ logWarn "Digest doesn't match, redownloading gs.exe..."
           lift $ logDebug ("rm -f " <> T.pack (fromGHCupPath (cacheDir dirs) </> "gs.exe"))
           lift $ hideError doesNotExistErrorType $ recycleFile (fromGHCupPath (cacheDir dirs) </> "gs.exe")
-          liftE @'[GPGError, DigestError , DownloadFailed] $ dl
+          liftE @'[GPGError, DigestError, ContentLengthError, DownloadFailed] $ dl
-        ) `catchE` liftE @'[GPGError, DigestError , DownloadFailed] dl
+        ) `catchE` liftE @'[GPGError, DigestError, ContentLengthError, DownloadFailed] dl
   | otherwise = pure ()
 
 
@@ -1301,7 +1301,7 @@ gitOut args dir = do
     ExitSuccess   -> pure $ T.pack $ stripNewlineEnd $ T.unpack $ decUTF8Safe' _stdOut
     ExitFailure c -> do
       let pe = NonZeroExit c "git" args
-      lift $ logDebug $ T.pack (prettyShow pe)
+      lift $ logDebug $ T.pack (prettyHFError pe)
       throwE pe
 
 processBranches :: T.Text -> [String]

lib/GHCup/Utils/Dirs.hs

@@ -465,15 +465,22 @@ withGHCupTmpDir :: ( MonadReader env m
                    , MonadMask m
                    , MonadIO m)
                 => m GHCupPath
-withGHCupTmpDir = snd <$> withRunInIO (\run ->
+withGHCupTmpDir = do
-  run
+  Settings{keepDirs} <- getSettings
-    $ allocate
+  snd <$> withRunInIO (\run ->
-        (run mkGhcupTmpDir)
+    run
-        (\fp ->
+      $ allocate
-            handleIO (\e -> run
+          (run mkGhcupTmpDir)
-                $ logDebug ("Resource cleanup failed for " <> T.pack (fromGHCupPath fp) <> ", error was: " <> T.pack (displayException e)))
+          (\fp -> if -- we don't know whether there was a failure, so can only
-            . removePathForcibly
+                     -- decide for 'Always'
-            $ fp))
+                     | keepDirs == Always -> pure ()
+                     | otherwise -> handleIO (\e -> run
+                        $ logDebug ("Resource cleanup failed for "
+                                   <> T.pack (fromGHCupPath fp)
+                                   <> ", error was: "
+                                   <> T.pack (displayException e)))
+                        . removePathForcibly
+                        $ fp))
 
 
 

scripts/bootstrap/bootstrap-haskell.ps1

@@ -38,9 +38,13 @@ param (
     # Specify the cabal root directory (default: '$InstallDir\cabal')
     [string]$CabalDir,
     # Whether to disable use of curl.exe
-    [switch]$DisableCurl
+    [switch]$DisableCurl,
+    # The Msys2 version to download (e.g. 20221216)
+    [string]$Msys2Version
 )
 
+$DefaultMsys2Version = "20221216"
+
 $Silent = !$Interactive
 
 function Print-Msg {
@@ -423,12 +427,15 @@ if (!(Test-Path -Path ('{0}' -f $MsysDir))) {
 	Start-Sleep -s 5
 
     # Download the archive
-    Print-Msg -msg 'Downloading Msys2 archive...'
+	if (!($Msys2Version)) {
-    $archive = 'msys2-x86_64-latest.sfx.exe'
+		$Msys2Version = $DefaultMsys2Version
+	}
+    Print-Msg -msg ('Downloading Msys2 archive {0}...' -f $Msys2Version)
+    $archive = ('msys2-base-x86_64-{0}.sfx.exe' -f $Msys2Version)
     $archivePath = ('{0}\{1}' -f ([IO.Path]::GetTempPath()), "$archive")
-    
+
     if ((Get-Command -Name 'curl.exe' -ErrorAction SilentlyContinue) -and !($DisableCurl)) {
-      Exec "curl.exe" '-o' "$archivePath" ('https://repo.msys2.org/distrib/{0}' -f "$archive")
+      Exec "curl.exe" '-o' "$archivePath" ('https://repo.msys2.org/distrib/x86_64/{0}' -f "$archive")
     } else {
       Get-FileWCSynchronous -url ('https://repo.msys2.org/distrib/{0}' -f $archive) -destinationFolder ([IO.Path]::GetTempPath()) -includeStats
     }
@@ -603,7 +610,7 @@ if ($DisableCurl) {
 if ((Get-Process -ID $PID).ProcessName.StartsWith("bootstrap-haskell") -Or $InBash) {
   Exec "$Bash" '-lc' ('{4} {6} {7} {8} {9} {10} [ -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}'' ; [[ ''{0}'' = https* ]]  && {11} {0} | bash || cat $(cygpath -m ''{0}'') | bash' -f $BootstrapUrl, $MsysDir, $GhcupBasePrefix, $GhcupDir, $SilentExport, $CabalDirFull, $StackInstallExport, $HLSInstallExport, $AdjustCabalConfigExport, $MinimalExport, $BootstrapDownloader, $DownloadScript)
 } else {
-  Exec "$Msys2Shell" '-mingw64' '-mintty' '-c' ('{4} {6} {7} {8} {9} {10} [ -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 ; [[ ''{0}'' = https* ]]  && {11} {0} | bash || cat $(cygpath -m ''{0}'') | bash ; echo ''Press any key to exit'' && read -n 1' -f $BootstrapUrl, $MsysDir, $GhcupBasePrefix, $GhcupDir, $SilentExport, $CabalDirFull, $StackInstallExport, $HLSInstallExport, $AdjustCabalConfigExport, $MinimalExport, $BootstrapDownloader, $DownloadScript)
+  Exec "$Msys2Shell" '-mingw64' '-mintty'  '-shell' 'bash' '-c' ('{4} {6} {7} {8} {9} {10} [ -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 ; [[ ''{0}'' = https* ]]  && {11} {0} | bash || cat $(cygpath -m ''{0}'') | bash ; echo ''Press any key to exit'' && read -n 1' -f $BootstrapUrl, $MsysDir, $GhcupBasePrefix, $GhcupDir, $SilentExport, $CabalDirFull, $StackInstallExport, $HLSInstallExport, $AdjustCabalConfigExport, $MinimalExport, $BootstrapDownloader, $DownloadScript)
 }