76 lines
2.3 KiB
Haskell
76 lines
2.3 KiB
Haskell
{- git-annex pointer files
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-
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- Copyright 2010-2018 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE CPP #-}
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module Annex.Content.PointerFile where
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#if ! defined(mingw32_HOST_OS)
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import System.Posix.Files
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#else
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import System.PosixCompat.Files
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#endif
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import Annex.Common
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import Annex.Perms
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import Annex.Link
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import Annex.ReplaceFile
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import Annex.InodeSentinal
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import Annex.Content.LowLevel
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import Utility.InodeCache
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#if ! defined(mingw32_HOST_OS)
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import Utility.Touch
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#endif
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import qualified Utility.RawFilePath as R
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{- Populates a pointer file with the content of a key.
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-
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- If the file already has some other content, it is not modified.
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-
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- Returns an InodeCache if it populated the pointer file.
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-}
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populatePointerFile :: Restage -> Key -> RawFilePath -> RawFilePath -> Annex (Maybe InodeCache)
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populatePointerFile restage k obj f = go =<< liftIO (isPointerFile f)
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where
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go (Just k') | k == k' = do
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let f' = fromRawFilePath f
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destmode <- liftIO $ catchMaybeIO $ fileMode <$> R.getFileStatus f
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liftIO $ removeWhenExistsWith R.removeLink f
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(ic, populated) <- replaceWorkTreeFile f' $ \tmp -> do
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let tmp' = toRawFilePath tmp
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ok <- linkOrCopy k obj tmp' destmode >>= \case
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Just _ -> thawContent tmp >> return True
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Nothing -> liftIO (writePointerFile tmp' k destmode) >> return False
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ic <- withTSDelta (liftIO . genInodeCache tmp')
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return (ic, ok)
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maybe noop (restagePointerFile restage f) ic
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if populated
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then return ic
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else return Nothing
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go _ = return Nothing
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{- Removes the content from a pointer file, replacing it with a pointer.
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-
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- Does not check if the pointer file is modified. -}
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depopulatePointerFile :: Key -> RawFilePath -> Annex ()
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depopulatePointerFile key file = do
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let file' = fromRawFilePath file
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st <- liftIO $ catchMaybeIO $ getFileStatus file'
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let mode = fmap fileMode st
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secureErase file
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liftIO $ removeWhenExistsWith R.removeLink file
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ic <- replaceWorkTreeFile file' $ \tmp -> do
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liftIO $ writePointerFile (toRawFilePath tmp) key mode
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#if ! defined(mingw32_HOST_OS)
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-- Don't advance mtime; this avoids unncessary re-smudging
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-- by git in some cases.
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liftIO $ maybe noop
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(\t -> touch tmp t False)
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(fmap modificationTimeHiRes st)
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#endif
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withTSDelta (liftIO . genInodeCache (toRawFilePath tmp))
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maybe noop (restagePointerFile (Restage True) file) ic
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