{-# LANGUAGE CPP #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-|
Module : GHCup.Download
Description : Downloading
Copyright : (c) Julian Ospald, 2020
License : LGPL-3.0
Maintainer : hasufell@hasufell.de
Stability : experimental
Portability : portable
Module for handling all download related functions.
Generally we support downloading via:
- curl (default)
- wget
- internal downloader (only when compiled)
-}
module GHCup.Download where
#if defined(INTERNAL_DOWNLOADER)
import GHCup.Download.IOStreams
import GHCup.Download.Utils
#endif
import GHCup.Errors
import GHCup.Types
import GHCup.Types.Optics
import GHCup.Types.JSON ( )
import GHCup.Utils.Dirs
import GHCup.Prelude
import GHCup.Prelude.File
import GHCup.Prelude.Logger.Internal
import GHCup.Prelude.Process
import GHCup.Version
import Control.Applicative
import Control.Exception.Safe
import Control.Monad
#if !MIN_VERSION_base(4,13,0)
import Control.Monad.Fail ( MonadFail )
#endif
import Control.Monad.Reader
import Control.Monad.Trans.Resource
hiding ( throwM )
import Data.Aeson
import Data.ByteString ( ByteString )
#if defined(INTERNAL_DOWNLOADER)
import Data.CaseInsensitive ( mk )
#endif
import Data.Maybe
import Data.List
import Data.Time.Clock
import Data.Time.Clock.POSIX
import Data.Versions
import Data.Word8 hiding ( isSpace )
import Haskus.Utils.Variant.Excepts
#if defined(INTERNAL_DOWNLOADER)
import Network.Http.Client hiding ( URL )
#endif
import Optics
import Prelude hiding ( abs
, readFile
, writeFile
)
import Safe
import System.Environment
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
import qualified Data.ByteString as B
import qualified Data.ByteString.Base16 as B16
import qualified Data.ByteString.Lazy as L
import qualified Data.Map.Strict as M
import qualified Data.Text as T
import qualified Data.Text.IO as T
import qualified Data.Text.Encoding as E
import qualified Data.Yaml.Aeson as Y
------------------
--[ High-level ]--
------------------
-- | Downloads the download information! But only if we need to ;P
getDownloadsF :: ( FromJSONKey Tool
, FromJSONKey Version
, FromJSON VersionInfo
, MonadReader env m
, HasSettings env
, HasDirs env
, MonadIO m
, MonadCatch m
, HasLog env
, MonadThrow m
, MonadFail m
, MonadMask m
)
=> Excepts
'[DigestError, GPGError, JSONError , DownloadFailed , FileDoesNotExistError]
m
GHCupInfo
getDownloadsF = do
Settings { urlSource } <- lift getSettings
case urlSource of
GHCupURL -> liftE $ getBase ghcupURL
(OwnSource exts) -> do
ext <- liftE $ mapM (either pure getBase) exts
mergeGhcupInfo ext
(OwnSpec av) -> pure av
(AddSource exts) -> do
base <- liftE $ getBase ghcupURL
ext <- liftE $ mapM (either pure getBase) exts
mergeGhcupInfo (base:ext)
where
mergeGhcupInfo :: MonadFail m
=> [GHCupInfo]
-> m GHCupInfo
mergeGhcupInfo [] = fail "mergeGhcupInfo: internal error: need at least one GHCupInfo"
mergeGhcupInfo xs@(GHCupInfo{}: _) =
let newDownloads = M.unionsWith (M.unionWith (\_ b2 -> b2)) (_ghcupDownloads <$> xs)
newGlobalTools = M.unionsWith (\_ a2 -> a2 ) (_globalTools <$> xs)
newToolReqs = M.unionsWith (M.unionWith (\_ b2 -> b2)) (_toolRequirements <$> xs)
in pure $ GHCupInfo newToolReqs newDownloads newGlobalTools
yamlFromCache :: (MonadReader env m, HasDirs env) => URI -> m FilePath
yamlFromCache uri = do
Dirs{..} <- getDirs
pure (fromGHCupPath cacheDir </> (T.unpack . decUTF8Safe . urlBaseName . view pathL' $ uri))
etagsFile :: FilePath -> FilePath
etagsFile = (<.> "etags")
getBase :: ( MonadReader env m
, HasDirs env
, HasSettings env
, MonadFail m
, MonadIO m
, MonadCatch m
, HasLog env
, MonadMask m
)
=> URI
-> Excepts '[GPGError, DigestError, JSONError, FileDoesNotExistError] m GHCupInfo
getBase uri = do
Settings { noNetwork, downloader } <- 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)
. catchE @_ @_ @'[] (\e@(DownloadFailed _) -> lift (warnCache (prettyShow e) downloader) >> pure Nothing)
. fmap Just
. smartDl
$ uri
-- if we didn't get a filepath from the download, use the cached yaml
actualYaml <- maybe (lift $ yamlFromCache uri) pure mYaml
lift $ logDebug $ "Decoding yaml at: " <> T.pack actualYaml
liftE
. onE_ (onError actualYaml)
. lEM' @_ @_ @'[JSONError] (\(displayException -> e) -> JSONDecodeError $ unlines [e, "Consider removing " <> actualYaml <> " manually."])
. liftIO
. Y.decodeFileEither
$ actualYaml
where
-- On error, remove the etags file and set access time to 0. This should ensure the next invocation
-- may re-download and succeed.
onError :: (MonadReader env m, HasLog env, MonadMask m, MonadCatch m, MonadIO m) => FilePath -> m ()
onError fp = do
let efp = etagsFile fp
handleIO (\e -> logWarn $ "Couldn't remove file " <> T.pack efp <> ", error was: " <> T.pack (displayException e))
(hideError doesNotExistErrorType $ rmFile efp)
liftIO $ hideError doesNotExistErrorType $ setAccessTime fp (posixSecondsToUTCTime (fromIntegral @Int 0))
warnCache :: (MonadReader env m, HasLog env, MonadMask m, MonadCatch m, MonadIO m) => FilePath -> Downloader -> m ()
warnCache s downloader' = do
let tryDownloder = case downloader' of
Curl -> "Wget"
Wget -> "Curl"
#if defined(INTERNAL_DOWNLOADER)
Internal -> "Curl"
#endif
logWarn $ "Could not get download info, trying cached version (this may not be recent!)" <> "\n" <>
"If this problem persists, consider switching downloader via: " <> "\n " <>
"ghcup config set downloader " <> tryDownloder
logDebug $ "Error was: " <> T.pack s
-- First check if the json file is in the ~/.ghcup/cache dir
-- and check it's access time. If it has been accessed within the
-- last 5 minutes, just reuse it.
--
-- Always save the local file with the mod time of the remote file.
smartDl :: forall m1 env1
. ( MonadReader env1 m1
, HasDirs env1
, HasSettings env1
, MonadCatch m1
, MonadIO m1
, MonadFail m1
, HasLog env1
, MonadMask m1
)
=> URI
-> Excepts
'[ DownloadFailed
, DigestError
, GPGError
]
m1
FilePath
smartDl uri' = do
json_file <- lift $ yamlFromCache uri'
let scheme = view (uriSchemeL' % schemeBSL') uri'
e <- liftIO $ doesFileExist json_file
currentTime <- liftIO getCurrentTime
Dirs { cacheDir } <- lift getDirs
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
| e -> do
accessTime <- fmap utcTimeToPOSIXSeconds $ liftIO $ getAccessTime json_file
let sinceLastAccess = utcTimeToPOSIXSeconds currentTime - accessTime
let cacheInterval = fromInteger metaCache
lift $ logDebug $ "last access was " <> T.pack (show sinceLastAccess) <> " ago, cache interval is " <> T.pack (show cacheInterval)
-- access time won't work on most linuxes, but we can try regardless
if | metaCache <= 0 -> dlWithMod currentTime json_file
| (sinceLastAccess > cacheInterval) ->
-- no access in last 5 minutes, re-check upstream mod time
dlWithMod currentTime json_file
| otherwise -> pure json_file
| otherwise -> dlWithMod currentTime json_file
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
liftIO $ setModificationTime f modTime
liftIO $ setAccessTime f modTime
pure f
getDownloadInfo :: ( MonadReader env m
, HasPlatformReq env
, HasGHCupInfo env
)
=> Tool
-> Version
-- ^ tool version
-> Excepts
'[NoDownload]
m
DownloadInfo
getDownloadInfo t v = do
(PlatformRequest a p mv) <- lift getPlatformReq
GHCupInfo { _ghcupDownloads = dls } <- lift getGHCupInfo
let distro_preview f g =
let platformVersionSpec =
preview (ix t % ix v % viArch % ix a % ix (f p)) dls
mv' = g mv
in fmap snd
. find
(\(mverRange, _) -> maybe
(isNothing mv')
(\range -> maybe False (`versionRange` range) mv')
mverRange
)
. M.toList
=<< platformVersionSpec
with_distro = distro_preview id id
without_distro_ver = distro_preview id (const Nothing)
without_distro = distro_preview (set _Linux UnknownLinux) (const Nothing)
maybe
(throwE NoDownload)
pure
(case p of
-- non-musl won't work on alpine
Linux Alpine -> with_distro <|> without_distro_ver
_ -> with_distro <|> without_distro_ver <|> without_distro
)
-- | Tries to download from the given http or https url
-- and saves the result in continuous memory into a file.
-- If the filename is not provided, then we:
-- 1. try to guess the filename from the url path
-- 2. otherwise create a random file
--
-- The file must not exist.
download :: ( MonadReader env m
, HasSettings env
, HasDirs env
, MonadMask m
, MonadThrow m
, HasLog env
, MonadIO m
)
=> URI
-> Maybe URI -- ^ URI for gpg sig
-> Maybe T.Text -- ^ expected hash
-> FilePath -- ^ destination dir (ignored for file:// scheme)
-> Maybe FilePath -- ^ optional filename
-> Bool -- ^ whether to read an write etags
-> Excepts '[DigestError , DownloadFailed, GPGError] m FilePath
download uri gpgUri eDigest dest mfn etags
| scheme == "https" = dl
| scheme == "http" = dl
| scheme == "file" = do
let destFile' = T.unpack . decUTF8Safe $ view pathL' uri
lift $ logDebug $ "using local file: " <> T.pack destFile'
forM_ eDigest (liftE . flip checkDigest destFile')
pure destFile'
| otherwise = throwE $ DownloadFailed (variantFromValue UnsupportedScheme)
where
scheme = view (uriSchemeL' % schemeBSL') uri
dl = do
baseDestFile <- liftE . reThrowAll @_ @_ @'[DownloadFailed] DownloadFailed $ getDestFile uri mfn
lift $ logInfo $ "downloading: " <> (decUTF8Safe . serializeURIRef') uri <> " as file " <> T.pack baseDestFile
-- destination dir must exist
liftIO $ createDirRecursive' dest
-- download
flip onException
(lift $ hideError doesNotExistErrorType $ recycleFile (tmpFile baseDestFile))
$ catchAllE @_ @'[GPGError, ProcessError, DownloadFailed, UnsupportedScheme, DigestError] @'[DigestError, DownloadFailed, GPGError]
(\e' -> do
lift $ hideError doesNotExistErrorType $ recycleFile (tmpFile baseDestFile)
case e' of
V e@GPGError {} -> throwE e
V e@DigestError {} -> throwE e
_ -> throwE (DownloadFailed e')
) $ do
Settings{ downloader, noNetwork, gpgSetting } <- lift getSettings
when noNetwork $ throwE (DownloadFailed (V NoNetwork :: V '[NoNetwork]))
downloadAction <- case downloader of
Curl -> do
o' <- liftIO getCurlOpts
if etags
then pure $ curlEtagsDL o'
else pure $ curlDL o'
Wget -> do
o' <- liftIO getWgetOpts
if etags
then pure $ wgetEtagsDL o'
else pure $ wgetDL o'
#if defined(INTERNAL_DOWNLOADER)
Internal -> do
if etags
then pure (\fp -> liftE . internalEtagsDL fp)
else pure (\fp -> liftE . internalDL fp)
#endif
liftE $ downloadAction baseDestFile uri
case (gpgUri, gpgSetting) of
(_, GPGNone) -> pure ()
(Just gpgUri', _) -> do
gpgDestFile <- liftE . reThrowAll @_ @_ @'[DownloadFailed] DownloadFailed $ getDestFile gpgUri' Nothing
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))
) $ do
o' <- liftIO getGpgOpts
lift $ logDebug $ "downloading: " <> (decUTF8Safe . serializeURIRef') gpgUri' <> " as file " <> T.pack gpgDestFile
liftE $ downloadAction gpgDestFile gpgUri'
lift $ logInfo $ "verifying signature of: " <> T.pack baseDestFile
let args = o' ++ ["--batch", "--verify", "--quiet", "--no-tty", gpgDestFile, baseDestFile]
cp <- lift $ executeOut "gpg" args Nothing
case cp of
CapturedProcess { _exitCode = ExitFailure i, _stdErr } -> do
lift $ logDebug $ decUTF8Safe' _stdErr
throwE (GPGError @'[ProcessError] (V (NonZeroExit i "gpg" args)))
CapturedProcess { _stdErr } -> lift $ logDebug $ decUTF8Safe' _stdErr
_ -> pure ()
forM_ eDigest (liftE . flip checkDigest baseDestFile)
pure baseDestFile
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
liftIO $ renameFile destFileTemp destFile
curlEtagsDL :: (MonadReader env 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"
flip finally (try @_ @SomeException $ rmFile dh) $
flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
metag <- lift $ readETag destFile
liftE $ lEM @_ @'[ProcessError] $ exec "curl"
(o' ++ (if etags then ["--dump-header", dh] else [])
++ maybe [] (\t -> ["-H", "If-None-Match: " <> T.unpack t]) metag
++ ["-fL", "-o", destFileTemp, T.unpack uri']) Nothing Nothing
headers <- liftIO $ T.readFile dh
-- this nonsense is necessary, because some older versions of curl would overwrite
-- the destination file when 304 is returned
case fmap T.words . listToMaybe . fmap T.strip . T.lines . getLastHeader $ headers of
Just (http':sc:_)
| sc == "304"
, T.pack "HTTP" `T.isPrefixOf` http' -> lift $ logDebug "Status code was 304, not overwriting"
| T.pack "HTTP" `T.isPrefixOf` http' -> do
lift $ logDebug $ "Status code was " <> sc <> ", overwriting"
liftIO $ renameFile destFileTemp destFile
_ -> liftE $ throwE @_ @'[DownloadFailed] (DownloadFailed (toVariantAt @0 (MalformedHeaders headers)
:: V '[MalformedHeaders]))
lift $ writeEtags destFile (parseEtags headers)
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
let opts = o' ++ ["-O", destFileTemp , T.unpack uri']
liftE $ lEM @_ @'[ProcessError] $ exec "wget" opts Nothing Nothing
liftIO $ renameFile destFileTemp destFile
wgetEtagsDL :: (MonadReader env 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
metag <- lift $ readETag destFile
let opts = o' ++ maybe [] (\t -> ["--header", "If-None-Match: " <> T.unpack t]) metag
++ ["-q", "-S", "-O", destFileTemp , T.unpack uri']
CapturedProcess {_exitCode, _stdErr} <- lift $ executeOut "wget" opts Nothing
case _exitCode of
ExitSuccess -> do
liftIO $ renameFile destFileTemp destFile
lift $ writeEtags destFile (parseEtags (decUTF8Safe' _stdErr))
ExitFailure i'
| i' == 8
, Just _ <- find (T.pack "304 Not Modified" `T.isInfixOf`) . T.lines . decUTF8Safe' $ _stdErr
-> do
lift $ logDebug "Not modified, skipping download"
lift $ writeEtags destFile (parseEtags (decUTF8Safe' _stdErr))
| otherwise -> throwE (NonZeroExit i' "wget" opts)
#if defined(INTERNAL_DOWNLOADER)
internalDL :: (MonadCatch m, MonadMask m, MonadIO m)
=> FilePath -> URI -> Excepts '[DownloadFailed, UnsupportedScheme] m ()
internalDL destFile uri' = do
let destFileTemp = tmpFile destFile
flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
(https, host, fullPath, port) <- liftE $ uriToQuadruple uri'
void $ liftE $ catchE @HTTPNotModified
@'[DownloadFailed]
(\e@(HTTPNotModified _) ->
throwE @_ @'[DownloadFailed] (DownloadFailed (toVariantAt @0 e :: V '[HTTPNotModified])))
$ downloadToFile https host fullPath port destFileTemp mempty
liftIO $ renameFile destFileTemp destFile
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
flip finally (try @_ @SomeException $ rmFile destFileTemp) $ do
(https, host, fullPath, port) <- liftE $ uriToQuadruple uri'
metag <- lift $ readETag destFile
let addHeaders = maybe mempty (\etag -> M.fromList [ (mk . E.encodeUtf8 . T.pack $ "If-None-Match"
, E.encodeUtf8 etag)]) metag
liftE
$ catchE @HTTPNotModified @'[DownloadFailed] @'[] (\(HTTPNotModified etag) -> lift $ writeEtags destFile (pure $ Just etag))
$ do
r <- downloadToFile https host fullPath port destFileTemp addHeaders
liftIO $ renameFile destFileTemp destFile
lift $ writeEtags destFile (pure $ decUTF8Safe <$> getHeader r "etag")
#endif
-- Manage to find a file we can write the body into.
getDestFile :: Monad m => URI -> Maybe FilePath -> Excepts '[NoUrlBase] m FilePath
getDestFile uri' mfn' =
let path = view pathL' uri'
in case mfn' of
Just fn -> pure (dest </> fn)
Nothing
| let urlBase = T.unpack (decUTF8Safe (urlBaseName path))
, not (null urlBase) -> pure (dest </> urlBase)
-- TODO: remove this once we use hpath again
| otherwise -> throwE $ NoUrlBase (decUTF8Safe . serializeURIRef' $ uri')
parseEtags :: (MonadReader env m, HasLog env, MonadIO m, MonadThrow m) => T.Text -> m (Maybe T.Text)
parseEtags stderr = do
let mEtag = find (\line -> T.pack "etag:" `T.isPrefixOf` T.toLower line) . fmap T.strip . T.lines . getLastHeader $ stderr
case T.words <$> mEtag of
(Just []) -> do
logDebug "Couldn't parse etags, no input: "
pure Nothing
(Just [_, etag']) -> do
logDebug $ "Parsed etag: " <> etag'
pure (Just etag')
(Just xs) -> do
logDebug ("Couldn't parse etags, unexpected input: " <> T.unwords xs)
pure Nothing
Nothing -> do
logDebug "No etags header found"
pure Nothing
writeEtags :: (MonadReader env m, HasLog env, MonadIO m, MonadThrow m) => FilePath -> m (Maybe T.Text) -> m ()
writeEtags destFile getTags = do
getTags >>= \case
Just t -> do
logDebug $ "Writing etagsFile " <> T.pack (etagsFile destFile)
liftIO $ T.writeFile (etagsFile destFile) t
Nothing ->
logDebug "No etags files written"
readETag :: (MonadReader env m, HasLog env, MonadCatch m, MonadIO m) => FilePath -> m (Maybe T.Text)
readETag fp = do
e <- liftIO $ doesFileExist fp
if e
then do
rE <- try @_ @SomeException $ liftIO $ fmap stripNewline' $ T.readFile (etagsFile fp)
case rE of
(Right et) -> do
logDebug $ "Read etag: " <> et
pure (Just et)
(Left _) -> do
logDebug "Etag file doesn't exist (yet)"
pure Nothing
else do
logDebug $ "Skipping and deleting etags file because destination file " <> T.pack fp <> " doesn't exist"
liftIO $ hideError doesNotExistErrorType $ rmFile (etagsFile fp)
pure Nothing
-- | Download into tmpdir or use cached version, if it exists. If filename
-- is omitted, infers the filename from the url.
downloadCached :: ( MonadReader env m
, HasDirs env
, HasSettings env
, MonadMask m
, MonadResource m
, MonadThrow m
, HasLog env
, MonadIO m
, MonadUnliftIO m
)
=> DownloadInfo
-> Maybe FilePath -- ^ optional filename
-> Excepts '[DigestError , 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
downloadCached' :: ( MonadReader env m
, HasDirs env
, HasSettings env
, MonadMask m
, MonadThrow m
, HasLog env
, MonadIO m
, MonadUnliftIO m
)
=> DownloadInfo
-> Maybe FilePath -- ^ optional filename
-> Maybe FilePath -- ^ optional destination dir (default: cacheDir)
-> Excepts '[DigestError , DownloadFailed, GPGError] m FilePath
downloadCached' dli mfn mDestDir = do
Dirs { cacheDir } <- lift getDirs
let destDir = fromMaybe (fromGHCupPath cacheDir) mDestDir
let fn = fromMaybe ((T.unpack . decUTF8Safe) $ urlBaseName $ view (dlUri % pathL') dli) mfn
let cachfile = destDir </> fn
fileExists <- liftIO $ doesFileExist cachfile
if
| fileExists -> do
liftE $ checkDigest (view dlHash dli) cachfile
pure cachfile
| otherwise -> liftE $ download (_dlUri dli) Nothing (Just (_dlHash dli)) destDir mfn False
------------------
--[ Low-level ]--
------------------
checkDigest :: ( MonadReader env m
, HasDirs env
, HasSettings env
, MonadIO m
, MonadThrow m
, HasLog env
)
=> T.Text -- ^ the hash
-> FilePath
-> Excepts '[DigestError] m ()
checkDigest eDigest file = do
Settings{ noVerify } <- lift getSettings
let verify = not noVerify
when verify $ do
let p' = takeFileName file
lift $ logInfo $ "verifying digest of: " <> T.pack p'
c <- liftIO $ L.readFile file
cDigest <- throwEither . E.decodeUtf8' . B16.encode . SHA256.hashlazy $ c
when ((cDigest /= eDigest) && verify) $ throwE (DigestError file cDigest eDigest)
-- | Get additional curl args from env. This is an undocumented option.
getCurlOpts :: IO [String]
getCurlOpts =
lookupEnv "GHCUP_CURL_OPTS" >>= \case
Just r -> pure $ splitOn " " r
Nothing -> pure []
-- | Get additional wget args from env. This is an undocumented option.
getWgetOpts :: IO [String]
getWgetOpts =
lookupEnv "GHCUP_WGET_OPTS" >>= \case
Just r -> pure $ splitOn " " r
Nothing -> pure []
-- | Get additional gpg args from env. This is an undocumented option.
getGpgOpts :: IO [String]
getGpgOpts =
lookupEnv "GHCUP_GPG_OPTS" >>= \case
Just r -> pure $ splitOn " " r
Nothing -> pure []
-- | Get the url base name.
--
-- >>> urlBaseName "/foo/bar/baz"
-- "baz"
urlBaseName :: ByteString -- ^ the url path (without scheme and host)
-> ByteString
urlBaseName = snd . B.breakEnd (== _slash) . urlDecode False
-- | Curl saves all intermediate connect headers as well, not just the last one, so we make an effort to take the
-- last HTTP block only. Passing '--suppress-connect-headers' would be better, but it isn't supported by all versions,
-- also see:
-- https://gitlab.haskell.org/haskell/ghcup-hs/-/issues/213
--
-- >>> getLastHeader "\n\nHTTP/1.0 200 Connection established\n\nHTTP/1.1 304 Not Modified\n"
-- "HTTP/1.1 304 Not Modified\n"
-- >>> getLastHeader "HTTP/1.1 304 Not Modified\n"
-- "HTTP/1.1 304 Not Modified\n"
getLastHeader :: T.Text -> T.Text
getLastHeader = T.unlines . lastDef [] . filter (\x -> not (null x)) . splitOn [""] . fmap T.stripEnd . T.lines
tmpFile :: FilePath -> FilePath
tmpFile = (<.> "tmp")