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|
{- git-annex file content managing
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Content (
inAnnex,
calcGitLink,
logStatus,
getViaTmp,
preventWrite,
allowWrite,
moveAnnex,
removeAnnex,
fromAnnex,
moveBad,
getKeysPresent
) where
import System.IO.Error (try)
import System.Directory
import Control.Monad.State (liftIO)
import System.Path
import Control.Monad (when, filterM)
import System.Posix.Files
import System.FilePath
import Types
import Locations
import LocationLog
import UUID
import qualified GitRepo as Git
import qualified Annex
import Utility
{- Checks if a given key is currently present in the gitAnnexLocation. -}
inAnnex :: Key -> Annex Bool
inAnnex key = do
g <- Annex.gitRepo
when (Git.repoIsUrl g) $ error "inAnnex cannot check remote repo"
liftIO $ doesFileExist $ gitAnnexLocation g key
{- Calculates the relative path to use to link a file to a key. -}
calcGitLink :: FilePath -> Key -> Annex FilePath
calcGitLink file key = do
g <- Annex.gitRepo
cwd <- liftIO $ getCurrentDirectory
let absfile = case absNormPath cwd file of
Just f -> f
Nothing -> error $ "unable to normalize " ++ file
return $ relPathDirToDir (parentDir absfile) (Git.workTree g) ++
annexLocation key
{- Updates the LocationLog when a key's presence changes. -}
logStatus :: Key -> LogStatus -> Annex ()
logStatus key status = do
g <- Annex.gitRepo
u <- getUUID g
logfile <- liftIO $ logChange g key u status
Annex.queue "add" ["--"] logfile
{- Runs an action, passing it a temporary filename to download,
- and if the action succeeds, moves the temp file into
- the annex as a key's content. -}
getViaTmp :: Key -> (FilePath -> Annex Bool) -> Annex Bool
getViaTmp key action = do
g <- Annex.gitRepo
let tmp = gitAnnexTmpLocation g key
liftIO $ createDirectoryIfMissing True (parentDir tmp)
success <- action tmp
if success
then do
moveAnnex key tmp
logStatus key ValuePresent
return True
else do
-- the tmp file is left behind, in case caller wants
-- to resume its transfer
return False
{- Removes the write bits from a file. -}
preventWrite :: FilePath -> IO ()
preventWrite f = unsetFileMode f writebits
where
writebits = foldl unionFileModes ownerWriteMode
[groupWriteMode, otherWriteMode]
{- Turns a file's write bit back on. -}
allowWrite :: FilePath -> IO ()
allowWrite f = do
s <- getFileStatus f
setFileMode f $ fileMode s `unionFileModes` ownerWriteMode
{- Moves a file into .git/annex/objects/ -}
moveAnnex :: Key -> FilePath -> Annex ()
moveAnnex key src = do
g <- Annex.gitRepo
let dest = gitAnnexLocation g key
let dir = parentDir dest
liftIO $ do
createDirectoryIfMissing True dir
allowWrite dir -- in case the directory already exists
renameFile src dest
preventWrite dest
preventWrite dir
{- Removes a key's file from .git/annex/objects/ -}
removeAnnex :: Key -> Annex ()
removeAnnex key = do
g <- Annex.gitRepo
let file = gitAnnexLocation g key
let dir = parentDir file
liftIO $ do
allowWrite dir
removeFile file
removeDirectory dir
{- Moves a key's file out of .git/annex/objects/ -}
fromAnnex :: Key -> FilePath -> Annex ()
fromAnnex key dest = do
g <- Annex.gitRepo
let file = gitAnnexLocation g key
let dir = parentDir file
liftIO $ do
allowWrite dir
allowWrite file
renameFile file dest
removeDirectory dir
{- Moves a key out of .git/annex/objects/ into .git/annex/bad, and
- returns the file it was moved to. -}
moveBad :: Key -> Annex FilePath
moveBad key = do
g <- Annex.gitRepo
let src = gitAnnexLocation g key
let dest = gitAnnexBadDir g </> takeFileName src
liftIO $ createDirectoryIfMissing True (parentDir dest)
liftIO $ allowWrite (parentDir src)
liftIO $ renameFile src dest
liftIO $ removeDirectory (parentDir src)
return dest
{- List of keys whose content exists in .git/annex/objects/ -}
getKeysPresent :: Annex [Key]
getKeysPresent = do
g <- Annex.gitRepo
getKeysPresent' $ gitAnnexObjectDir g
getKeysPresent' :: FilePath -> Annex [Key]
getKeysPresent' dir = do
exists <- liftIO $ doesDirectoryExist dir
if (not exists)
then return []
else do
contents <- liftIO $ getDirectoryContents dir
files <- liftIO $ filterM present contents
return $ map fileKey files
where
present d = do
result <- try $
getFileStatus $ dir ++ "/" ++ d ++ "/" ++ takeFileName d
case result of
Right s -> return $ isRegularFile s
Left _ -> return False
|
