72 lines
2.4 KiB
Haskell
72 lines
2.4 KiB
Haskell
{- git-annex file replacing
|
|
-
|
|
- Copyright 2013-2025 Joey Hess <id@joeyh.name>
|
|
-
|
|
- Licensed under the GNU AGPL version 3 or higher.
|
|
-}
|
|
|
|
module Annex.ReplaceFile (
|
|
replaceGitAnnexDirFile,
|
|
replaceGitDirFile,
|
|
replaceWorkTreeFile,
|
|
replaceFile,
|
|
replaceFile',
|
|
) where
|
|
|
|
import Annex.Common
|
|
import Annex.Tmp
|
|
import Annex.Perms
|
|
import Git
|
|
import Utility.Tmp
|
|
import Utility.Tmp.Dir
|
|
import Utility.Directory.Create
|
|
|
|
{- replaceFile on a file located inside the gitAnnexDir. -}
|
|
replaceGitAnnexDirFile :: OsPath -> (OsPath -> Annex a) -> Annex a
|
|
replaceGitAnnexDirFile = replaceFile createAnnexDirectory
|
|
|
|
{- replaceFile on a file located inside the .git directory. -}
|
|
replaceGitDirFile :: OsPath -> (OsPath -> Annex a) -> Annex a
|
|
replaceGitDirFile = replaceFile $ \dir -> do
|
|
top <- fromRepo localGitDir
|
|
liftIO $ createDirectoryUnder [top] dir
|
|
|
|
{- replaceFile on a worktree file. -}
|
|
replaceWorkTreeFile :: OsPath -> (OsPath -> Annex a) -> Annex a
|
|
replaceWorkTreeFile = replaceFile createWorkTreeDirectory
|
|
|
|
{- Replaces a possibly already existing file with a new version,
|
|
- atomically, by running an action.
|
|
-
|
|
- The action is passed the name of temp file, in a temp directory,
|
|
- which it can write to, and once done the temp file is moved into place
|
|
- and anything else in the temp directory is deleted.
|
|
-
|
|
- The action can throw an exception, in which case the temp directory
|
|
- will be deleted, and the existing file will be preserved.
|
|
-
|
|
- Throws an IO exception when it was unable to replace the file.
|
|
-
|
|
- The createdirectory action is only run when moving the file into place
|
|
- fails, and can create any parent directory structure needed.
|
|
-}
|
|
replaceFile :: (OsPath -> Annex ()) -> OsPath -> (OsPath -> Annex a) -> Annex a
|
|
replaceFile createdirectory file action = replaceFile' createdirectory file (const True) action
|
|
|
|
replaceFile' :: (OsPath -> Annex ()) -> OsPath -> (a -> Bool) -> (OsPath -> Annex a) -> Annex a
|
|
replaceFile' createdirectory file checkres action = withOtherTmp $ \othertmpdir -> do
|
|
let basetmp = relatedTemplate (fromOsPath (takeFileName file))
|
|
withTmpDirIn othertmpdir basetmp $ \tmpdir -> do
|
|
let tmpfile = tmpdir </> basetmp
|
|
r <- action tmpfile
|
|
when (checkres r) $
|
|
replaceFileFrom tmpfile file createdirectory
|
|
return r
|
|
|
|
replaceFileFrom :: OsPath -> OsPath -> (OsPath -> Annex ()) -> Annex ()
|
|
replaceFileFrom src dest createdirectory = go `catchIO` fallback
|
|
where
|
|
go = liftIO $ moveFile src dest
|
|
fallback _ = do
|
|
createdirectory (parentDir dest)
|
|
go
|