ghcup-hs/lib/GHCup/Utils/Dirs.hs
2021-08-30 23:36:11 +02:00

359 lines
9.9 KiB
Haskell

{-# LANGUAGE CPP #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE ViewPatterns #-}
{-|
Module : GHCup.Utils.Dirs
Description : Definition of GHCup directories
Copyright : (c) Julian Ospald, 2020
License : LGPL-3.0
Maintainer : hasufell@hasufell.de
Stability : experimental
Portability : portable
-}
module GHCup.Utils.Dirs
( getAllDirs
, ghcupBaseDir
, ghcupConfigFile
, ghcupCacheDir
, ghcupGHCBaseDir
, ghcupGHCDir
, mkGhcupTmpDir
, parseGHCupGHCDir
, relativeSymlink
, withGHCupTmpDir
, getConfigFilePath
#if !defined(IS_WINDOWS)
, useXDG
#endif
, cleanupTrash
)
where
import GHCup.Errors
import GHCup.Types
import GHCup.Types.JSON ( )
import GHCup.Types.Optics
import GHCup.Utils.MegaParsec
import GHCup.Utils.Prelude
import Control.Exception.Safe
import Control.Monad
import Control.Monad.IO.Unlift
import Control.Monad.Reader
import Control.Monad.Trans.Resource hiding (throwM)
import Data.Bifunctor
import Data.Maybe
import GHC.IO.Exception ( IOErrorType(NoSuchThing) )
import Haskus.Utils.Variant.Excepts
import Optics
import System.Directory
import System.DiskSpace
import System.Environment
import System.FilePath
import System.IO.Temp
import qualified Data.ByteString as BS
import qualified Data.Text as T
import qualified Data.YAML.Aeson as Y
import qualified Text.Megaparsec as MP
import Control.Concurrent (threadDelay)
------------------------------
--[ GHCup base directories ]--
------------------------------
-- | ~/.ghcup by default
--
-- If 'GHCUP_USE_XDG_DIRS' is set (to anything),
-- then uses 'XDG_DATA_HOME/ghcup' as per xdg spec.
ghcupBaseDir :: IO FilePath
ghcupBaseDir = do
#if defined(IS_WINDOWS)
bdir <- fromMaybe "C:\\" <$> lookupEnv "GHCUP_INSTALL_BASE_PREFIX"
pure (bdir </> "ghcup")
#else
xdg <- useXDG
if xdg
then do
bdir <- lookupEnv "XDG_DATA_HOME" >>= \case
Just r -> pure r
Nothing -> do
home <- liftIO getHomeDirectory
pure (home </> ".local" </> "share")
pure (bdir </> "ghcup")
else do
bdir <- lookupEnv "GHCUP_INSTALL_BASE_PREFIX" >>= \case
Just r -> pure r
Nothing -> liftIO getHomeDirectory
pure (bdir </> ".ghcup")
#endif
-- | ~/.ghcup by default
--
-- If 'GHCUP_USE_XDG_DIRS' is set (to anything),
-- then uses 'XDG_CONFIG_HOME/ghcup' as per xdg spec.
ghcupConfigDir :: IO FilePath
ghcupConfigDir = do
#if defined(IS_WINDOWS)
ghcupBaseDir
#else
xdg <- useXDG
if xdg
then do
bdir <- lookupEnv "XDG_CONFIG_HOME" >>= \case
Just r -> pure r
Nothing -> do
home <- liftIO getHomeDirectory
pure (home </> ".config")
pure (bdir </> "ghcup")
else do
bdir <- lookupEnv "GHCUP_INSTALL_BASE_PREFIX" >>= \case
Just r -> pure r
Nothing -> liftIO getHomeDirectory
pure (bdir </> ".ghcup")
#endif
-- | If 'GHCUP_USE_XDG_DIRS' is set (to anything),
-- then uses 'XDG_BIN_HOME' env var or defaults to '~/.local/bin'
-- (which, sadly is not strictly xdg spec).
ghcupBinDir :: IO FilePath
ghcupBinDir = do
#if defined(IS_WINDOWS)
ghcupBaseDir <&> (</> "bin")
#else
xdg <- useXDG
if xdg
then do
lookupEnv "XDG_BIN_HOME" >>= \case
Just r -> pure r
Nothing -> do
home <- liftIO getHomeDirectory
pure (home </> ".local" </> "bin")
else ghcupBaseDir <&> (</> "bin")
#endif
-- | Defaults to '~/.ghcup/cache'.
--
-- If 'GHCUP_USE_XDG_DIRS' is set (to anything),
-- then uses 'XDG_CACHE_HOME/ghcup' as per xdg spec.
ghcupCacheDir :: IO FilePath
ghcupCacheDir = do
#if defined(IS_WINDOWS)
ghcupBaseDir <&> (</> "cache")
#else
xdg <- useXDG
if xdg
then do
bdir <- lookupEnv "XDG_CACHE_HOME" >>= \case
Just r -> pure r
Nothing -> do
home <- liftIO getHomeDirectory
pure (home </> ".cache")
pure (bdir </> "ghcup")
else ghcupBaseDir <&> (</> "cache")
#endif
-- | Defaults to '~/.ghcup/logs'.
--
-- If 'GHCUP_USE_XDG_DIRS' is set (to anything),
-- then uses 'XDG_CACHE_HOME/ghcup/logs' as per xdg spec.
ghcupLogsDir :: IO FilePath
ghcupLogsDir = do
#if defined(IS_WINDOWS)
ghcupBaseDir <&> (</> "logs")
#else
xdg <- useXDG
if xdg
then do
bdir <- lookupEnv "XDG_CACHE_HOME" >>= \case
Just r -> pure r
Nothing -> do
home <- liftIO getHomeDirectory
pure (home </> ".cache")
pure (bdir </> "ghcup" </> "logs")
else ghcupBaseDir <&> (</> "logs")
#endif
-- | '~/.ghcup/trash'.
-- Mainly used on windows to improve file removal operations
ghcupRecycleDir :: IO FilePath
ghcupRecycleDir = ghcupBaseDir <&> (</> "trash")
getAllDirs :: IO Dirs
getAllDirs = do
baseDir <- ghcupBaseDir
binDir <- ghcupBinDir
cacheDir <- ghcupCacheDir
logsDir <- ghcupLogsDir
confDir <- ghcupConfigDir
recycleDir <- ghcupRecycleDir
pure Dirs { .. }
-------------------
--[ GHCup files ]--
-------------------
getConfigFilePath :: (MonadIO m) => m FilePath
getConfigFilePath = do
confDir <- liftIO ghcupConfigDir
pure $ confDir </> "config.yaml"
ghcupConfigFile :: (MonadIO m)
=> Excepts '[JSONError] m UserSettings
ghcupConfigFile = do
filepath <- getConfigFilePath
contents <- liftIO $ handleIO' NoSuchThing (\_ -> pure Nothing) $ Just <$> BS.readFile filepath
case contents of
Nothing -> pure defaultUserSettings
Just contents' -> lE' JSONDecodeError . first snd . Y.decode1Strict $ contents'
-------------------------
--[ GHCup directories ]--
-------------------------
-- | ~/.ghcup/ghc by default.
ghcupGHCBaseDir :: (MonadReader env m, HasDirs env) => m FilePath
ghcupGHCBaseDir = do
Dirs {..} <- getDirs
pure (baseDir </> "ghc")
-- | Gets '~/.ghcup/ghc/<ghcupGHCDir>'.
-- The dir may be of the form
-- * armv7-unknown-linux-gnueabihf-8.8.3
-- * 8.8.4
ghcupGHCDir :: (MonadReader env m, HasDirs env, MonadThrow m)
=> GHCTargetVersion
-> m FilePath
ghcupGHCDir ver = do
ghcbasedir <- ghcupGHCBaseDir
let verdir = T.unpack $ tVerToText ver
pure (ghcbasedir </> verdir)
-- | See 'ghcupToolParser'.
parseGHCupGHCDir :: MonadThrow m => FilePath -> m GHCTargetVersion
parseGHCupGHCDir (T.pack -> fp) =
throwEither $ MP.parse ghcTargetVerP "" fp
mkGhcupTmpDir :: ( MonadReader env m
, HasDirs env
, MonadUnliftIO m
, HasLog env
, MonadCatch m
, MonadThrow m
, MonadMask m
, MonadIO m)
=> m FilePath
mkGhcupTmpDir = do
tmpdir <- liftIO getCanonicalTemporaryDirectory
let minSpace = 5000 -- a rough guess, aight?
space <- handleIO (\_ -> pure Nothing) $ fmap Just $ liftIO $ getAvailSpace tmpdir
when (maybe False (toBytes minSpace >) space) $ do
logWarn ("Possibly insufficient disk space on "
<> T.pack tmpdir
<> ". At least "
<> T.pack (show minSpace)
<> " MB are recommended, but only "
<> toMB (fromJust space)
<> " are free. Consider freeing up disk space or setting TMPDIR env variable.")
logWarn
"...waiting for 10 seconds before continuing anyway, you can still abort..."
liftIO $ threadDelay 10000000 -- give the user a sec to intervene
liftIO $ createTempDirectory tmpdir "ghcup"
where
toBytes mb = mb * 1024 * 1024
toMB b = T.pack $ show (truncate' (fromIntegral b / (1024 * 1024) :: Double) 2)
truncate' :: Double -> Int -> Double
truncate' x n = fromIntegral (floor (x * t) :: Integer) / t
where t = 10^n
withGHCupTmpDir :: ( MonadReader env m
, HasDirs env
, HasLog env
, HasSettings env
, MonadUnliftIO m
, MonadCatch m
, MonadResource m
, MonadThrow m
, MonadMask m
, MonadIO m)
=> m FilePath
withGHCupTmpDir = snd <$> withRunInIO (\run ->
run
$ allocate
(run mkGhcupTmpDir)
(\fp ->
handleIO (\e -> run
$ logDebug ("Resource cleanup failed for " <> T.pack fp <> ", error was: " <> T.pack (displayException e)))
. rmPathForcibly
$ fp))
--------------
--[ Others ]--
--------------
#if !defined(IS_WINDOWS)
useXDG :: IO Bool
useXDG = isJust <$> lookupEnv "GHCUP_USE_XDG_DIRS"
#endif
relativeSymlink :: FilePath -- ^ the path in which to create the symlink
-> FilePath -- ^ the symlink destination
-> FilePath
relativeSymlink p1 p2 =
let d1 = splitDirectories p1
d2 = splitDirectories p2
common = takeWhile (\(x, y) -> x == y) $ zip d1 d2
cPrefix = drop (length common) d1
in joinPath (replicate (length cPrefix) "..")
<> joinPath ([pathSeparator] : drop (length common) d2)
cleanupTrash :: ( MonadIO m
, MonadMask m
, MonadReader env m
, HasLog env
, HasDirs env
, HasSettings env
)
=> m ()
cleanupTrash = do
Dirs { recycleDir } <- getDirs
contents <- liftIO $ listDirectory recycleDir
if null contents
then pure ()
else do
logWarn ("Removing leftover files in " <> T.pack recycleDir)
forM_ contents (\fp -> handleIO (\e ->
logDebug ("Resource cleanup failed for " <> T.pack fp <> ", error was: " <> T.pack (displayException e))
) $ liftIO $ removePathForcibly (recycleDir </> fp))