module Stackage.Update
( stackageUpdate
, StackageUpdateSettings
, defaultStackageUpdateSettings
) where
import Control.Exception (IOException, try)
import Control.Monad (when)
import Data.Version (Version, parseVersion)
import System.Directory (createDirectoryIfMissing,
doesDirectoryExist,
findExecutable,
getAppUserDataDirectory,
removeFile)
import System.Exit (ExitCode (ExitSuccess), exitWith)
import System.FilePath ((<.>), (</>))
import System.IO (hPutStrLn, stderr)
import System.Process (createProcess, cwd, proc,
readProcess, waitForProcess)
import Text.ParserCombinators.ReadP (readP_to_S)
data StackageUpdateSettings = StackageUpdateSettings
defaultStackageUpdateSettings :: StackageUpdateSettings
defaultStackageUpdateSettings = StackageUpdateSettings
version19 :: Version
version19 =
case map fst $ filter (null . snd) $ readP_to_S parseVersion "1.9" of
x:_ -> x
[] -> error "Couldn't parse 1.9 as a version"
stackageUpdate :: StackageUpdateSettings -> IO ()
stackageUpdate StackageUpdateSettings = do
mgit <- findExecutable "git"
git <-
case mgit of
Just git -> return git
Nothing -> error "Please install git and provide the executable on your PATH"
fullVer <- readProcess git ["--version"] ""
let hasNSB =
case reverse $ words fullVer of
ver:_ ->
case map fst $ filter (null . snd) $ readP_to_S parseVersion ver of
ver':_ -> ver' >= version19
[] -> False
[] -> False
cloneArgs =
"clone" : "https://github.com/commercialhaskell/all-cabal-files.git" : rest
where
rest
| hasNSB =
[ "-b", "display"
, "--depth", "1"
, "--no-single-branch"
]
| otherwise =
[ "-b", "hackage"
]
sDir <- getAppUserDataDirectory "stackage"
let suDir = sDir </> "update"
acfDir = suDir </> "all-cabal-files"
repoExists <- doesDirectoryExist acfDir
if repoExists
then runIn suDir acfDir "git" ["fetch"]
else runIn suDir suDir "git" cloneArgs
cabalDir <- getAppUserDataDirectory "cabal"
let hackageDir = cabalDir </> "packages" </> "hackage.haskell.org"
createDirectoryIfMissing True hackageDir
let tarFile = hackageDir </> "00-index.tar"
gzFile = tarFile <.> "gz"
_ <- tryIO $ removeFile tarFile
runIn suDir acfDir "git" ["archive", "--format=tar", "-o", tarFile, "origin/hackage"]
tryIO :: IO a -> IO (Either IOException a)
tryIO = try
runIn :: FilePath
-> FilePath
-> FilePath
-> [String]
-> IO ()
runIn suDir dir cmd args = do
createDirectoryIfMissing True dir
(Nothing, Nothing, Nothing, ph) <- createProcess (proc cmd args)
{ cwd = Just dir
}
ec <- waitForProcess ph
when (ec /= ExitSuccess) $ do
hPutStrLn stderr $ concat
[ "Exit code "
, show ec
, " while running "
, show (cmd:args)
, " in "
, dir
]
hPutStrLn stderr $ concat
[ "If the problem persists, please delete the following directory "
, "and try again"
]
hPutStrLn stderr suDir
exitWith ec