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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 Types.KeySource
import Backend
import Logs.Location
import Annex.Content
import Annex.Content.Direct
import Annex.Perms
import Utility.Touch
import Utility.FileMode
import Config
def :: [Command]
def = [notDirect $ notBareRepo $
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, generating a key for it using a
- backend, and then moving it into the annex directory and setting up
- the symlink pointing to its content. -}
start :: FilePath -> CommandStart
start file = 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 KeySource
lockDown file = do
liftIO $ preventWrite file
tmp <- fromRepo gitAnnexTmpDir
createAnnexDirectory tmp
liftIO $ do
(tmpfile, h) <- openTempFile tmp (takeFileName file)
hClose h
nukeFile tmpfile
createLink file tmpfile
return $ KeySource { keyFilename = file , contentLocation = tmpfile }
{- Moves a locked down file into the annex.
-
- In direct mode, leaves the file alone, and just updates bookeeping
- information.
-}
ingest :: KeySource -> Annex (Maybe Key)
ingest source = do
backend <- chooseBackend $ keyFilename source
ifM isDirect
( do
mstat <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus $ keyFilename source
k <- genKey source backend
godirect k (toCache =<< mstat)
, go =<< genKey source backend
)
where
go (Just (key, _)) = do
handle (undo (keyFilename source) key) $
moveAnnex key $ contentLocation source
liftIO $ nukeFile $ keyFilename source
return $ Just key
go Nothing = failure
godirect (Just (key, _)) (Just cache) =
ifM (compareCache (keyFilename source) $ Just cache)
( do
writeCache key cache
void $ addAssociatedFile key $ keyFilename source
liftIO $ allowWrite $ keyFilename source
liftIO $ nukeFile $ contentLocation source
return $ Just key
, failure
)
godirect _ _ = failure
failure = do
liftIO $ nukeFile $ contentLocation source
return Nothing
perform :: FilePath -> CommandPerform
perform file =
maybe stop (\key -> next $ cleanup file key True)
=<< ingest =<< lockDown 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, returns the link target. -}
link :: FilePath -> Key -> Bool -> Annex String
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
return l
{- 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.addCommand "add" (params++[Param "--"]) [file]
return True
|
