Bump to version 0.1.5

.gitlab/before_script/linux/alpine/install_deps.sh

@@ -42,7 +42,8 @@ chmod +x "${GHCUP_INSTALL_BASE_PREFIX}/.ghcup/bin/cabal"
 
 # utils
 apk add --no-cache \
-	bash
+	bash \
+	git
 
 ## Package specific
 apk add --no-cache \

.gitlab/before_script/linux/install_deps.sh

@@ -3,7 +3,7 @@
 set -eux
 
 sudo apt-get update -y
-sudo apt-get install -y libnuma-dev zlib1g-dev libgmp-dev libgmp10 libssl-dev liblzma-dev
+sudo apt-get install -y libnuma-dev zlib1g-dev libgmp-dev libgmp10 libssl-dev liblzma-dev git wget
 
 . "$( cd "$(dirname "$0")" ; pwd -P )/../../ghcup_env"
 

.gitlab/script/ghcup_release.sh

@@ -10,15 +10,17 @@ ecabal() {
 	cabal --store-dir="$(pwd)"/.store "$@"
 }
 
+git describe
+
 # build
 ecabal update
 
 if [ "${OS}" = "LINUX" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} -fcurl --ghc-options='-split-sections -optl-static'
+	ecabal build -w ghc-${GHC_VERSION} --ghc-options='-split-sections -optl-static'
 elif [ "${OS}" = "FREEBSD" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} -fcurl --ghc-options='-split-sections'
+	ecabal build -w ghc-${GHC_VERSION} --ghc-options='-split-sections'
 else
-	ecabal build -w ghc-${GHC_VERSION} -fcurl
+	ecabal build -w ghc-${GHC_VERSION}
 fi
 
 mkdir out

.gitlab/script/ghcup_version.sh

@@ -14,15 +14,16 @@ eghcup() {
 	ghcup -v -c -s file://$(pwd)/ghcup-${JSON_VERSION}.json "$@"
 }
 
+git describe
 
 ### build
 
 ecabal update
 
 if [ "${OS}" = "DARWIN" ] ; then
-	ecabal build -w ghc-${GHC_VERSION} -fcurl
-else
 	ecabal build -w ghc-${GHC_VERSION}
+else
+	ecabal build -w ghc-${GHC_VERSION} -finternal-downloader
 fi
 
 cp "$(ecabal new-exec --enable-tests --verbose=0 --offline sh -- -c 'command -v ghcup')" .
@@ -70,7 +71,11 @@ ghci-$(ghc --numeric-version) --version
 
 # test installing new ghc doesn't mess with currently set GHC
 # https://gitlab.haskell.org/haskell/ghcup-hs/issues/7
-eghcup install 8.4.4
+if [ "${OS}" = "LINUX" ] ; then
+	eghcup --downloader=wget install 8.4.4
+else # test wget a bit
+	eghcup install 8.4.4
+fi
 [ "$(ghc --numeric-version)" = "${ghc_ver}" ]
 eghcup set 8.4.4
 eghcup set 8.4.4

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Revision history for ghcup
 
+## 0.1.5 -- 2020-04-30
+
+* Fix errors when PATH variable contains path components that are actually files
+* Add `--version` and `--numeric-version` options
+* Add `changelog` command
+* Also check for available GHC and Cabal updates on start
+* Add base versions as tags for every GHC version (these are "installable" tags and the latest GHC version matching the tag will be picked)
+* Added `--format-raw` to list subcommand
+* Allow to install X.Y versions (e.g.: ghcup install 8.8)
+* Implement `--keep=<always|errors|never>` to control temporary build directories cleanup
+* Add proper shell completions to the repo
+* Fix building of documentation
+* Allow to work in offline mode and use cached files if possible
+* Allow to set the downloader via `--downloader=<curl|wget>`
+* Support for compiling and installing a cross GHC (see README). This is experimental.
+
 ## 0.1.4 -- 2020-04-16
 
 * build on all platforms with curl (as a binary), wrt https://gitlab.haskell.org/haskell/ghcup-hs/issues/6

HACKING.md

@@ -43,3 +43,22 @@ Kazu Yamamoto [explained it in his PR](https://github.com/yesodweb/wai/pull/752#
 1. Brittany
 2. mtl-style preferred
 3. no overly pointfree style
+
+## Code structure
+
+Main functionality is in `GHCup` module. Utility functions are
+organised tree-ish in `GHCup.Utils` and `GHCup.Utils.*`.
+
+Anything dealing with ghcup specific directories is in
+`GHCup.Utils.Dirs`.
+
+Download information on where to fetch bindists from is in
+`GHCup.Data.GHCupDownloads`.
+
+## Major refactors
+
+1. First major refactor included adding cross support. This added
+   `GHCTargetVersion`, which includes the target in addition to the version.
+   Most of the `Version` parameters to functions had to be replaced with
+   that and ensured the logic is consistent for cross and non-cross
+   installs.

README.md

@@ -11,6 +11,8 @@ Similar in scope to [rustup](https://github.com/rust-lang-nursery/rustup.rs), [p
    * [Installation](#installation)
    * [Usage](#usage)
      * [Manpages](#manpages)
+     * [Shell-completion](#shell-completion)
+     * [Cross support](#cross-support)
    * [Design goals](#design-goals)
    * [How](#how)
    * [Known users](#known-users)
@@ -68,11 +70,25 @@ handles your haskell packages and can demand that [a specific version](https://c
 For man pages to work you need [man-db](http://man-db.nongnu.org/) as your `man` provider, then issue `man ghc`. Manpages only work for the currently set ghc.
 `MANPATH` may be required to be unset.
 
-### Bash-completion
+### Shell-completion
 
-Depending on your distro and setup, install `.bash-completion` from this repo
+Shell completions are in `shell-completions`.
-as e.g. `/etc/bash_completion.d/ghcup` and make sure your bashrc sources the
+
-startup script (`/usr/share/bash-completion/bash_completion` on some distros).
+For bash: install `shell-completions/bash`
+as e.g. `/etc/bash_completion.d/ghcup` (depending on distro)
+and make sure your bashrc sources the startup script
+(`/usr/share/bash-completion/bash_completion` on some distros).
+
+### Cross support
+
+ghcup can compile and install a cross GHC for any target. However, this
+requires that the build host has a complete cross toolchain and various
+libraries installed for the target platform.
+
+Consult the GHC documentation on the [prerequisites](https://gitlab.haskell.org/ghc/ghc/-/wikis/building/cross-compiling#tools-to-install).
+For distributions with non-standard locations of cross toolchain and
+libraries, this may need some tweaking of `build.mk` or configure args.
+See `ghcup compile ghc --help` for further information.
 
 ## Design goals
 

RELEASING.md

@@ -4,8 +4,11 @@
 
 2. Add/fix downloads to `GHCupDownloads` module, then run `ghcup-gen gen` to generate the new json and validate it via `ghcup-gen check`.
 
-3. Commit and git push with tag. Wait for tests to succeed.
+3. Commit and git push with tag. Wait for tests to succeed and release artifacts to build.
 
-4. Upload the new `ghcup-<ver>.json` to `webhost.haskell.org/ghcup/data/`.
+4. Download release artifacts and upload them `downloads.haskell.org/ghcup`
+
+5. Add release artifacts to GHCupDownloads (see point 2.)
+
+6. Upload the final `ghcup-<ver>.json` to `webhost.haskell.org/ghcup/data/`.
 
-5. Build ghcup releases for Linux (fully static), mac (with `-fcurl`) and FreeBSD (with `-fcurl`). Upload to `webhost.haskell.org/ghcup/bin/` and update symlinks.

app/ghcup-gen/Validate.hs

@@ -179,7 +179,7 @@ validateTarballs dls = do
 
  where
   downloadAll dli = do
-    let settings = Settings True False Never
+    let settings = Settings True False Never Curl
     let runLogger = myLoggerT LoggerConfig { lcPrintDebug = True
                                            , colorOutter  = B.hPut stderr
                                            , rawOutter    = (\_ -> pure ())

app/ghcup/Main.hs

@@ -76,6 +76,7 @@ data Options = Options
   , optUrlSource :: Maybe URI
   , optNoVerify  :: Bool
   , optKeepDirs  :: KeepDirs
+  , optsDownloader :: Downloader
   -- commands
   , optCommand   :: Command
   }
@@ -181,8 +182,25 @@ opts =
           (  long "keep"
           <> metavar "<always|errors|never>"
           <> help
-               "Keep build directories?"
+               "Keep build directories? (default: never)"
           <> value Never
+          <> hidden
+          )
+    <*> option
+          (eitherReader downloaderParser)
+          (  long "downloader"
+#if defined(INTERNAL_DOWNLOADER)
+          <> metavar "<internal|curl|wget>"
+          <> help
+          "Downloader to use (default: internal)"
+          <> value Internal
+#else
+          <> metavar "<curl|wget>"
+          <> help
+          "Downloader to use (default: curl)"
+          <> value Curl
+#endif
+          <> hidden
           )
     <*> com
  where
@@ -558,6 +576,16 @@ keepOnParser s' | t == T.pack "always" = Right Always
   where t = T.toLower (T.pack s')
 
 
+downloaderParser :: String -> Either String Downloader
+downloaderParser s' | t == T.pack "curl"     = Right Curl
+                    | t == T.pack "wget"     = Right Wget
+#if defined(INTERNAL_DOWNLOADER)
+                    | t == T.pack "internal" = Right Internal
+#endif
+                    | otherwise = Left ("Unknown downloader value: " <> s')
+  where t = T.toLower (T.pack s')
+
+
 platformParser :: String -> Either String PlatformRequest
 platformParser s' = case MP.parse (platformP <* MP.eof) "" (T.pack s') of
   Right r -> pure r
@@ -622,9 +650,10 @@ platformParser s' = case MP.parse (platformP <* MP.eof) "" (T.pack s') of
 
 toSettings :: Options -> Settings
 toSettings Options {..} =
-  let cache    = optCache
+  let cache      = optCache
-      noVerify = optNoVerify
+      noVerify   = optNoVerify
-      keepDirs = optKeepDirs
+      keepDirs   = optKeepDirs
+      downloader = optsDownloader
   in  Settings { .. }
 
 
@@ -812,9 +841,9 @@ Report bugs at <https://gitlab.haskell.org/haskell/ghcup-hs/issues>|]
           (GHCupInfo treq dls) <-
             ( runLogger
               . flip runReaderT settings
-              . runE @'[JSONError , DownloadFailed]
+              . runE @'[JSONError , DownloadFailed, FileDoesNotExistError]
               $ liftE
-              $ getDownloads (maybe GHCupURL OwnSource optUrlSource)
+              $ getDownloadsF (maybe GHCupURL OwnSource optUrlSource)
               )
               >>= \case
                     VRight r -> pure r

ghcup-0.0.2.json

@@ -58,6 +58,33 @@
             "distroPKGs": [],
             "notes": "You need the following packages: curl g++ gcc gmp make ncurses realpath xz-utils. Consult your distro documentation on the exact names of those packages."
           }
+        },
+        "Linux_CentOS": {
+          "7": {
+            "distroPKGs": [
+              "gcc",
+              "gcc-c++",
+              "gmp",
+              "make",
+              "ncurses",
+              "xz",
+              "perl"
+            ],
+            "notes": ""
+          },
+          "unknown_versioning": {
+            "distroPKGs": [
+              "gcc",
+              "gcc-c++",
+              "gmp",
+              "make",
+              "ncurses",
+              "ncurses-compat-libs",
+              "xz",
+              "perl"
+            ],
+            "notes": ""
+          }
         }
       }
     }

ghcup.cabal

@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               ghcup
-version:            0.1.4
+version:            0.1.5
 synopsis:           ghc toolchain installer as an exe/library
 description:
   A rewrite of the shell script ghcup, for providing
@@ -21,8 +21,8 @@ source-repository head
   type:     git
   location: https://gitlab.haskell.org/haskell/ghcup-hs.git
 
-flag Curl
+flag internal-downloader
-  description: Use curl instead of http-io-streams for download
+  description: Compile the internal downloader, which links against OpenSSL
   default:     False
   manual:      True
 
@@ -302,15 +302,14 @@ library
   -- other-extensions:
   hs-source-dirs:  lib
 
-  if !flag(curl)
+  if flag(internal-downloader)
     import:
       , HsOpenSSL
       , http-io-streams
       , io-streams
       , terminal-progress-bar
     exposed-modules: GHCup.Download.IOStreams
-  else
+    cpp-options:     -DINTERNAL_DOWNLOADER
-    cpp-options:     -DCURL
 
 executable ghcup
   import:
@@ -345,6 +344,10 @@ executable ghcup
   hs-source-dirs:   app/ghcup
   default-language: Haskell2010
 
+  if flag(internal-downloader)
+    cpp-options:     -DINTERNAL_DOWNLOADER
+
+
 executable ghcup-gen
   import:
     config

lib/GHCup/Data/ToolRequirements.hs

@@ -5,6 +5,7 @@ module GHCup.Data.ToolRequirements where
 
 import           GHCup.Types
 import           GHCup.Utils.String.QQ
+import           GHCup.Utils.Version.QQ
 
 import qualified Data.Map                      as M
 
@@ -61,6 +62,35 @@ toolRequirements = M.fromList
                 )
               ]
             )
+          , ( Linux CentOS
+            , M.fromList
+              [ ( Nothing
+                , Requirements
+                  [ "gcc"
+                  , "gcc-c++"
+                  , "gmp"
+                  , "make"
+                  , "ncurses"
+                  , "ncurses-compat-libs"
+                  , "xz"
+                  , "perl"
+                  ]
+                  ""
+                ),
+              ( Just [vers|7|]
+                , Requirements
+                  [ "gcc"
+                  , "gcc-c++"
+                  , "gmp"
+                  , "make"
+                  , "ncurses"
+                  , "xz"
+                  , "perl"
+                  ]
+                  ""
+                )
+              ]
+            )
           , ( Darwin
             , M.fromList
               [ ( Nothing

lib/GHCup/Download.hs

@@ -11,7 +11,7 @@
 
 module GHCup.Download where
 
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import           GHCup.Download.IOStreams
 import           GHCup.Download.Utils
 #endif
@@ -35,18 +35,19 @@ import           Control.Monad.Reader
 import           Control.Monad.Trans.Resource
                                          hiding ( throwM )
 import           Data.Aeson
-#if !defined(CURL)
 import           Data.ByteString                ( ByteString )
+#if defined(INTERNAL_DOWNLOADER)
 import           Data.CaseInsensitive           ( CI )
 #endif
 import           Data.Maybe
 import           Data.String.Interpolate
 import           Data.Time.Clock
 import           Data.Time.Clock.POSIX
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import           Data.Time.Format
 #endif
 import           Data.Versions
+import           Data.Word8
 import           GHC.IO.Exception
 import           HPath
 import           HPath.IO                      as HIO
@@ -57,12 +58,14 @@ import           Prelude                 hiding ( abs
                                                 , writeFile
                                                 )
 import           System.IO.Error
+import           System.Posix.Env.ByteString    ( getEnv )
 import           URI.ByteString
 
 import qualified Crypto.Hash.SHA256            as SHA256
+import qualified Data.ByteString               as BS
 import qualified Data.ByteString.Base16        as B16
 import qualified Data.ByteString.Lazy          as L
-#if !defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
 import qualified Data.CaseInsensitive          as CI
 import qualified Data.Map.Strict               as M
 import qualified Data.Text                     as T
@@ -82,6 +85,48 @@ import qualified System.Posix.RawFilePath.Directory
     ------------------
 
 
+-- | Like 'getDownloads', but tries to fall back to
+-- cached ~/.ghcup/cache/ghcup-<format-ver>.json
+getDownloadsF :: ( FromJSONKey Tool
+                 , FromJSONKey Version
+                 , FromJSON VersionInfo
+                 , MonadIO m
+                 , MonadCatch m
+                 , MonadLogger m
+                 , MonadThrow m
+                 , MonadFail m
+                 , MonadReader Settings m
+                 )
+              => URLSource
+              -> Excepts
+                   '[JSONError , DownloadFailed , FileDoesNotExistError]
+                   m
+                   GHCupInfo
+getDownloadsF urlSource = do
+  case urlSource of
+    GHCupURL ->
+      liftE
+        $ handleIO (\_ -> readFromCache)
+        $ catchE @_ @'[JSONError , FileDoesNotExistError]
+            (\(DownloadFailed _) -> readFromCache)
+        $ getDownloads urlSource
+    (OwnSource _) -> liftE $ getDownloads urlSource
+    (OwnSpec   _) -> liftE $ getDownloads urlSource
+ where
+  readFromCache = do
+    lift $ $(logWarn)
+      [i|Could not get download info, trying cached version (this may not be recent!)|]
+    let path = view pathL' ghcupURL
+    cacheDir  <- liftIO $ ghcupCacheDir
+    json_file <- (cacheDir </>) <$> urlBaseName path
+    bs        <-
+      handleIO' NoSuchThing
+                (\_ -> throwE $ FileDoesNotExistError (toFilePath json_file))
+      $ liftIO
+      $ readFile json_file
+    lE' JSONDecodeError $ eitherDecode' bs
+
+
 -- | Downloads the download information! But only if we need to ;P
 getDownloads :: ( FromJSONKey Tool
                 , FromJSONKey Version
@@ -91,6 +136,7 @@ getDownloads :: ( FromJSONKey Tool
                 , MonadLogger m
                 , MonadThrow m
                 , MonadFail m
+                , MonadReader Settings m
                 )
              => URLSource
              -> Excepts '[JSONError , DownloadFailed] m GHCupInfo
@@ -116,7 +162,12 @@ getDownloads urlSource = do
   --
   -- Always save the local file with the mod time of the remote file.
   smartDl :: forall m1
-           . (MonadCatch m1, MonadIO m1, MonadFail m1, MonadLogger m1)
+           . ( MonadCatch m1
+             , MonadIO m1
+             , MonadFail m1
+             , MonadLogger m1
+             , MonadReader Settings m1
+             )
           => URI
           -> Excepts
                '[ FileDoesNotExistError
@@ -148,31 +199,38 @@ getDownloads urlSource = do
               Just modTime -> do
                 fileMod <- liftIO $ getModificationTime json_file
                 if modTime > fileMod
-                  then do
+                  then dlWithMod modTime json_file
-                    bs <- liftE $ downloadBS uri'
-                    liftIO $ writeFileWithModTime modTime json_file bs
-                    pure bs
                   else liftIO $ readFile json_file
               Nothing -> do
                 lift $ $(logDebug) [i|Unable to get/parse Last-Modified header|]
-                liftIO $ deleteFile json_file
+                dlWithoutMod json_file
-                liftE $ downloadBS uri'
           else -- access in less than 5 minutes, re-use file
                liftIO $ readFile json_file
       else do
         liftIO $ createDirIfMissing newDirPerms cacheDir
         getModTime >>= \case
-          Just modTime -> do
+          Just modTime -> dlWithMod modTime json_file
-            bs <- liftE $ downloadBS uri'
-            liftIO $ writeFileWithModTime modTime json_file bs
-            pure bs
           Nothing -> do
+            -- although we don't know last-modified, we still save
+            -- it to a file, so we might use it in offline mode
             lift $ $(logDebug) [i|Unable to get/parse Last-Modified header|]
-            liftE $ downloadBS uri'
+            dlWithoutMod json_file
 
    where
+    dlWithMod modTime json_file = do
+      bs <- liftE $ downloadBS uri'
+      liftIO $ writeFileWithModTime modTime json_file bs
+      pure bs
+    dlWithoutMod json_file = do
+      bs <- liftE $ downloadBS uri'
+      liftIO $ hideError doesNotExistErrorType $ deleteFile json_file
+      liftIO $ writeFileL json_file (Just newFilePerms) bs
+      liftIO $ setModificationTime json_file (fromIntegral @Int 0)
+      pure bs
+
+
     getModTime = do
-#if defined(CURL)
+#if !defined(INTERNAL_DOWNLOADER)
       pure Nothing
 #else
       headers <-
@@ -271,12 +329,19 @@ download dli dest mfn
             (liftIO $ hideError doesNotExistErrorType $ deleteFile destFile)
               >> (throwE . DownloadFailed $ e)
           ) $ do
-#if defined(CURL)
+              lift getDownloader >>= \case
-              liftE $ lEM @_ @'[ProcessError] $ liftIO $ exec "curl" True
+                Curl -> do
-                ["-fL", "-o", toFilePath destFile , serializeURIRef' $ view dlUri dli] Nothing Nothing
+                  o' <- liftIO getCurlOpts
-#else
+                  liftE $ lEM @_ @'[ProcessError] $ liftIO $ exec "curl" True
-              (https, host, fullPath, port) <- liftE $ uriToQuadruple (view dlUri dli)
+                    (o' ++ ["-fL", "-o", toFilePath destFile, serializeURIRef' $ view dlUri dli]) Nothing Nothing
-              liftE $ downloadToFile https host fullPath port destFile
+                Wget -> do
+                  o' <- liftIO getWgetOpts
+                  liftE $ lEM @_ @'[ProcessError] $ liftIO $ exec "wget" True
+                    (o' ++ ["-O", toFilePath destFile , serializeURIRef' $ view dlUri dli]) Nothing Nothing
+#if defined(INTERNAL_DOWNLOADER)
+                Internal -> do
+                  (https, host, fullPath, port) <- liftE $ uriToQuadruple (view dlUri dli)
+                  liftE $ downloadToFile https host fullPath port destFile
 #endif
 
     liftE $ checkDigest dli destFile
@@ -329,7 +394,7 @@ downloadCached dli mfn = do
 
 
 -- | This is used for downloading the JSON.
-downloadBS :: (MonadCatch m, MonadIO m)
+downloadBS :: (MonadReader Settings m, MonadCatch m, MonadIO m, MonadLogger m)
            => URI
            -> Excepts
                 '[ FileDoesNotExistError
@@ -356,18 +421,33 @@ downloadBS uri'
  where
   scheme = view (uriSchemeL' % schemeBSL') uri'
   path   = view pathL' uri'
-#if defined(CURL)
+#if defined(INTERNAL_DOWNLOADER)
-  dl _ = do
-    let exe = [rel|curl|]
-        args = ["-sSfL", serializeURIRef' uri']
-    liftIO (executeOut exe args Nothing) >>= \case
-      CapturedProcess ExitSuccess stdout _ -> do
-        pure $ L.fromStrict stdout
-      CapturedProcess (ExitFailure i') _ _ -> throwE $ NonZeroExit i' (toFilePath exe) args
-#else
   dl https = do
-    (_, host', fullPath', port') <- liftE $ uriToQuadruple uri'
+#else
-    liftE $ downloadBS' https host' fullPath' port'
+  dl _ = do
+#endif
+    lift $ $(logDebug) [i|downloading: #{serializeURIRef' uri'}|]
+    lift getDownloader >>= \case
+      Curl -> do
+        o' <- liftIO getCurlOpts
+        let exe = [rel|curl|]
+            args = o' ++ ["-sSfL", serializeURIRef' uri']
+        liftIO (executeOut exe args Nothing) >>= \case
+          CapturedProcess ExitSuccess stdout _ -> do
+            pure $ L.fromStrict stdout
+          CapturedProcess (ExitFailure i') _ _ -> throwE $ NonZeroExit i' (toFilePath exe) args
+      Wget -> do
+        o' <- liftIO getWgetOpts
+        let exe = [rel|wget|]
+            args = o' ++ ["-qO-", serializeURIRef' uri']
+        liftIO (executeOut exe args Nothing) >>= \case
+          CapturedProcess ExitSuccess stdout _ -> do
+            pure $ L.fromStrict stdout
+          CapturedProcess (ExitFailure i') _ _ -> throwE $ NonZeroExit i' (toFilePath exe) args
+#if defined(INTERNAL_DOWNLOADER)
+      Internal -> do
+        (_, host', fullPath', port') <- liftE $ uriToQuadruple uri'
+        liftE $ downloadBS' https host' fullPath' port'
 #endif
 
 
@@ -385,3 +465,19 @@ checkDigest dli file = do
     let eDigest = view dlHash dli
     when ((cDigest /= eDigest) && verify) $ throwE (DigestError cDigest eDigest)
 
+
+-- | Get additional curl args from env. This is an undocumented option.
+getCurlOpts :: IO [ByteString]
+getCurlOpts =
+  getEnv "GHCUP_CURL_OPTS" >>= \case
+    Just r  -> pure $ BS.split _space r
+    Nothing -> pure []
+
+
+-- | Get additional wget args from env. This is an undocumented option.
+getWgetOpts :: IO [ByteString]
+getWgetOpts =
+  getEnv "GHCUP_WGET_OPTS" >>= \case
+    Just r  -> pure $ BS.split _space r
+    Nothing -> pure []
+

lib/GHCup/Types.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP               #-}
 {-# LANGUAGE DeriveGeneric     #-}
 {-# LANGUAGE OverloadedStrings #-}
 
@@ -141,9 +142,10 @@ data URLSource = GHCupURL
 
 
 data Settings = Settings
-  { cache    :: Bool
+  { cache      :: Bool
-  , noVerify :: Bool
+  , noVerify   :: Bool
-  , keepDirs :: KeepDirs
+  , keepDirs   :: KeepDirs
+  , downloader :: Downloader
   }
   deriving Show
 
@@ -153,6 +155,12 @@ data KeepDirs = Always
               | Never
   deriving (Eq, Show, Ord)
 
+data Downloader = Curl
+                | Wget
+#if defined(INTERNAL_DOWNLOADER)
+                | Internal
+#endif
+  deriving (Eq, Show, Ord)
 
 data DebugInfo = DebugInfo
   { diBaseDir  :: Path Abs

lib/GHCup/Utils.hs

@@ -174,6 +174,7 @@ ghcSet mtarget = do
   ghcBin <- (</> ghc) <$> liftIO ghcupBinDir
 
   -- link destination is of the form ../ghc/<ver>/bin/ghc
+  -- for old ghcup, it is ../ghc/<ver>/bin/ghc-<ver>
   liftIO $ handleIO' NoSuchThing (\_ -> pure $ Nothing) $ do
     link <- readSymbolicLink $ toFilePath ghcBin
     Just <$> ghcLinkVersion link
@@ -193,8 +194,8 @@ ghcSet mtarget = do
              MP.setInput rest
              pure x
            )
-        <* MP.chunk "/bin/"
+        <* MP.chunk "/"
-        <* ghcTargetBinP "ghc"
+        <* MP.takeRest
         <* MP.eof
 
 
@@ -349,6 +350,10 @@ getCache :: MonadReader Settings m => m Bool
 getCache = ask <&> cache
 
 
+getDownloader :: MonadReader Settings m => m Downloader
+getDownloader = ask <&> downloader
+
+
 
     -------------
     --[ Other ]--

lib/GHCup/Version.hs

@@ -16,7 +16,7 @@ ghcupURL :: URI
 ghcupURL = [uri|https://www.haskell.org/ghcup/data/ghcup-0.0.2.json|]
 
 ghcUpVer :: PVP
-ghcUpVer = [pver|0.1.4|]
+ghcUpVer = [pver|0.1.5|]
 
 numericVer :: String
 numericVer = T.unpack . prettyPVP $ ghcUpVer

shell-completions/fish

@@ -0,0 +1,19 @@
+ function _ghcup
+    set -l cl (commandline --tokenize --current-process)
+    # Hack around fish issue #3934
+    set -l cn (commandline --tokenize --cut-at-cursor --current-process)
+    set -l cn (count $cn)
+    set -l tmpline --bash-completion-enriched --bash-completion-index $cn
+    for arg in $cl
+      set tmpline $tmpline --bash-completion-word $arg
+    end
+    for opt in (ghcup $tmpline)
+      if test -d $opt
+        echo -E "$opt/"
+      else
+        echo -E "$opt"
+      end
+    end
+end
+
+complete --no-files --command ghcup --arguments '(_ghcup)'

shell-completions/zsh

@@ -0,0 +1,32 @@
+#compdef ghcup
+
+local request
+local completions
+local word
+local index=$((CURRENT - 1))
+
+request=(--bash-completion-enriched --bash-completion-index $index)
+for arg in ${words[@]}; do
+  request=(${request[@]} --bash-completion-word $arg)
+done
+
+IFS=$'\n' completions=($( ghcup "${request[@]}" ))
+
+for word in $completions; do
+  local -a parts
+
+  # Split the line at a tab if there is one.
+  IFS=$'\t' parts=($( echo $word ))
+
+  if [[ -n $parts[2] ]]; then
+     if [[ $word[1] == "-" ]]; then
+       local desc=("$parts[1] ($parts[2])")
+       compadd -d desc -- $parts[1]
+     else
+       local desc=($(print -f  "%-019s -- %s" $parts[1] $parts[2]))
+       compadd -l -d desc -- $parts[1]
+     fi
+  else
+    compadd -f -- $word
+  fi
+done