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|
{- git-annex command
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Add where
import Common.Annex
import Annex.Exception
import Command
import qualified Annex
import qualified Annex.Queue
import Backend
import Logs.Location
import Annex.Content
import Annex.Perms
import Utility.Touch
import Utility.FileMode
def :: [Command]
def = [command "add" paramPaths seek "add files to annex"]
{- Add acts on both files not checked into git yet, and unlocked files. -}
seek :: [CommandSeek]
seek = [withFilesNotInGit start, withFilesUnlocked start]
{- The add subcommand annexes a file, storing it in a backend, and then
- moving it into the annex directory and setting up the symlink pointing
- to its content. -}
start :: FilePath -> CommandStart
start file = notBareRepo $ ifAnnexed file fixup add
where
add = do
s <- liftIO $ getSymbolicLinkStatus file
if isSymbolicLink s || not (isRegularFile s)
then stop
else do
showStart "add" file
next $ perform file
fixup (key, _) = do
-- fixup from an interrupted add; the symlink
-- is present but not yet added to git
showStart "add" file
liftIO $ removeFile file
next $ next $ cleanup file key =<< inAnnex key
{- The file that's being added is locked down before a key is generated,
- to prevent it from being modified in between. It's hard linked into a
- temporary location, and its writable bits are removed. It could still be
- written to by a process that already has it open for writing. -}
lockDown :: FilePath -> Annex FilePath
lockDown file = do
liftIO $ preventWrite file
tmp <- fromRepo gitAnnexTmpDir
createAnnexDirectory tmp
pid <- liftIO getProcessID
let tmpfile = tmp </> "add" ++ show pid ++ "." ++ takeFileName file
liftIO $ nukeFile tmpfile
liftIO $ createLink file tmpfile
return tmpfile
{- Moves the file into the annex. -}
ingest :: FilePath -> Annex (Maybe Key)
ingest file = do
tmpfile <- lockDown file
let source = KeySource { keyFilename = file, contentLocation = tmpfile }
backend <- chooseBackend file
genKey source backend >>= go tmpfile
where
go _ Nothing = return Nothing
go tmpfile (Just (key, _)) = do
handle (undo file key) $ moveAnnex key tmpfile
liftIO $ nukeFile file
return $ Just key
perform :: FilePath -> CommandPerform
perform file = maybe stop (\key -> next $ cleanup file key True) =<< ingest file
{- On error, put the file back so it doesn't seem to have vanished.
- This can be called before or after the symlink is in place. -}
undo :: FilePath -> Key -> IOException -> Annex a
undo file key e = do
whenM (inAnnex key) $ do
liftIO $ nukeFile file
handle tryharder $ fromAnnex key file
logStatus key InfoMissing
throw e
where
-- fromAnnex could fail if the file ownership is weird
tryharder :: IOException -> Annex ()
tryharder _ = do
src <- inRepo $ gitAnnexLocation key
liftIO $ moveFile src file
{- Creates the symlink to the annexed content. -}
link :: FilePath -> Key -> Bool -> Annex ()
link file key hascontent = handle (undo file key) $ do
l <- calcGitLink file key
liftIO $ createSymbolicLink l file
when hascontent $ do
logStatus key InfoPresent
-- touch the symlink to have the same mtime as the
-- file it points to
liftIO $ do
mtime <- modificationTime <$> getFileStatus file
touch file (TimeSpec mtime) False
{- Note: Several other commands call this, and expect it to
- create the symlink and add it. -}
cleanup :: FilePath -> Key -> Bool -> CommandCleanup
cleanup file key hascontent = do
link file key hascontent
params <- ifM (Annex.getState Annex.force)
( return [Param "-f"]
, return []
)
Annex.Queue.add "add" (params++[Param "--"]) [file]
return True
|
