e505c03bcc
nukeFile replaced with removeWhenExistsWith removeLink, which allows using RawFilePath. Utility.Directory cannot use RawFilePath since setup does not depend on posix. This commit was sponsored by Graham Spencer on Patreon.
76 lines
2.4 KiB
Haskell
76 lines
2.4 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 (fromRawFilePath 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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