c981ccc077
Anything that tries to open the file for write, or delete the file, or replace it with something else, will not affect the add. Only if a process has the file open for write before add starts can it still change it while (or after) it's added to the annex. (fsck will catch this later of course)
111 lines
3.3 KiB
Haskell
111 lines
3.3 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Command.Add where
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import Common.Annex
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import Annex.Exception
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import Command
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import qualified Annex
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import qualified Annex.Queue
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import Backend
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import Logs.Location
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import Annex.Content
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import Annex.Perms
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import Utility.Touch
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import Utility.FileMode
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def :: [Command]
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def = [command "add" paramPaths seek "add files to annex"]
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{- Add acts on both files not checked into git yet, and unlocked files. -}
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seek :: [CommandSeek]
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seek = [withFilesNotInGit start, withFilesUnlocked start]
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{- The add subcommand annexes a file, storing it in a backend, and then
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- moving it into the annex directory and setting up the symlink pointing
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- to its content. -}
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start :: FilePath -> CommandStart
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start file = notBareRepo $ ifAnnexed file fixup add
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where
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add = do
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s <- liftIO $ getSymbolicLinkStatus file
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if isSymbolicLink s || not (isRegularFile s)
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then stop
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else do
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showStart "add" file
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next $ perform file
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fixup (key, _) = do
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-- fixup from an interrupted add; the symlink
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-- is present but not yet added to git
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showStart "add" file
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liftIO $ removeFile file
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next $ next $ cleanup file key =<< inAnnex key
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{- The file that's being added is locked down before a key is generated,
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- to prevent it from being modified in between. It's hard linked into a
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- temporary location, and its writable bits are removed. It could still be
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- written to by a process that already has it open for writing. -}
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perform :: FilePath -> CommandPerform
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perform file = do
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liftIO $ preventWrite file
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tmp <- fromRepo gitAnnexTmpDir
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createAnnexDirectory tmp
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pid <- liftIO getProcessID
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let tmpfile = tmp </> "add" ++ show pid ++ "." ++ takeFileName file
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nuke tmpfile
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liftIO $ createLink file tmpfile
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let source = KeySource { keyFilename = file, contentLocation = tmpfile }
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backend <- chooseBackend file
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genKey source backend >>= go tmpfile
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where
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go _ Nothing = stop
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go tmpfile (Just (key, _)) = do
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handle (undo file key) $ moveAnnex key tmpfile
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nuke file
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next $ cleanup file key True
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nuke :: FilePath -> Annex ()
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nuke file = liftIO $ whenM (doesFileExist file) $ removeFile file
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{- On error, put the file back so it doesn't seem to have vanished.
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- This can be called before or after the symlink is in place. -}
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undo :: FilePath -> Key -> IOException -> Annex a
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undo file key e = do
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whenM (inAnnex key) $ do
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nuke file
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handle tryharder $ fromAnnex key file
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logStatus key InfoMissing
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throw e
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where
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-- fromAnnex could fail if the file ownership is weird
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tryharder :: IOException -> Annex ()
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tryharder _ = do
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src <- inRepo $ gitAnnexLocation key
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liftIO $ moveFile src file
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cleanup :: FilePath -> Key -> Bool -> CommandCleanup
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cleanup file key hascontent = do
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handle (undo file key) $ do
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link <- calcGitLink file key
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liftIO $ createSymbolicLink link file
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when hascontent $ do
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logStatus key InfoPresent
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-- touch the symlink to have the same mtime as the
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-- file it points to
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liftIO $ do
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mtime <- modificationTime <$> getFileStatus file
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touch file (TimeSpec mtime) False
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params <- ifM (Annex.getState Annex.force)
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( return [Param "-f"]
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, return []
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)
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Annex.Queue.add "add" (params++[Param "--"]) [file]
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return True
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