git-annex/Command/Lock.hs
Joey Hess cbaebf538a rework git check-attr interface
Now gitattributes are looked up, efficiently, in only the places that
really need them, using the same approach used for cat-file.

The old CheckAttr code seemed very fragile, in the way it streamed files
through git check-attr.
I actually found that cad8824852
was still deadlocking with ghc 7.4, at the end of adding a lot of files.
This should fix that problem, and avoid future ones.

The best part is that this removes withAttrFilesInGit and withNumCopies,
which were complicated Seek methods, as well as simplfying the types
for several other Seek methods that had a Backend tupled in.
2012-02-13 23:52:21 -04:00

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Haskell

{- git-annex command
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Lock where
import Common.Annex
import Command
import qualified Annex.Queue
def :: [Command]
def = [command "lock" paramPaths seek "undo unlock command"]
seek :: [CommandSeek]
seek = [withFilesUnlocked start, withFilesUnlockedToBeCommitted start]
start :: FilePath -> CommandStart
start file = do
showStart "lock" file
next $ perform file
perform :: FilePath -> CommandPerform
perform file = do
liftIO $ removeFile file
-- Checkout from HEAD to get rid of any changes that might be
-- staged in the index, and get back to the previous symlink to
-- the content.
Annex.Queue.add "checkout" [Param "HEAD", Param "--"] [file]
next $ return True -- no cleanup needed