0cb34f3caa
This was also tripped by the test suite's automatic conflict resolution test. Which also shows BTW that an unnecessary copy of content is done sometimes when merging in direct mode. Not going to try to speed that up now.
227 lines
7 KiB
Haskell
227 lines
7 KiB
Haskell
{- git-annex direct mode
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-
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- Copyright 2012 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 Annex.Direct where
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import Common.Annex
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import qualified Git
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import qualified Git.LsFiles
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import qualified Git.Merge
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import qualified Git.DiffTree as DiffTree
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import Git.Sha
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import Git.Types
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import Annex.CatFile
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import Utility.FileMode
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import qualified Annex.Queue
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import Logs.Location
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import Backend
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import Types.KeySource
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import Annex.Content
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import Annex.Content.Direct
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import Annex.Link
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import Utility.InodeCache
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import Utility.CopyFile
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import Annex.Perms
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import Annex.ReplaceFile
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{- Uses git ls-files to find files that need to be committed, and stages
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- them into the index. Returns True if some changes were staged. -}
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stageDirect :: Annex Bool
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stageDirect = do
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Annex.Queue.flush
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top <- fromRepo Git.repoPath
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(l, cleanup) <- inRepo $ Git.LsFiles.stagedDetails [top]
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forM_ l go
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void $ liftIO cleanup
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staged <- Annex.Queue.size
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Annex.Queue.flush
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return $ staged /= 0
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where
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{- Determine what kind of modified or deleted file this is, as
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- efficiently as we can, by getting any key that's associated
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- with it in git, as well as its stat info. -}
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go (file, Just sha) = do
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shakey <- catKey sha
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mstat <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus file
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filekey <- isAnnexLink file
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case (shakey, filekey, mstat, toInodeCache =<< mstat) of
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(_, Just key, _, _)
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| shakey == filekey -> noop
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{- A changed symlink. -}
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| otherwise -> stageannexlink file key
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(Just key, _, _, Just cache) -> do
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{- All direct mode files will show as
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- modified, so compare the cache to see if
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- it really was. -}
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oldcache <- recordedInodeCache key
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case oldcache of
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[] -> modifiedannexed file key cache
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_ -> unlessM (elemInodeCaches cache oldcache) $
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modifiedannexed file key cache
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(Just key, _, Nothing, _) -> deletedannexed file key
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(Nothing, _, Nothing, _) -> deletegit file
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(_, _, Just _, _) -> addgit file
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go _ = noop
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modifiedannexed file oldkey cache = do
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void $ removeAssociatedFile oldkey file
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void $ addDirect file cache
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deletedannexed file key = do
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void $ removeAssociatedFile key file
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deletegit file
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stageannexlink file key = do
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l <- inRepo $ gitAnnexLink file key
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stageSymlink file =<< hashSymlink l
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void $ addAssociatedFile key file
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addgit file = Annex.Queue.addCommand "add" [Param "-f"] [file]
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deletegit file = Annex.Queue.addCommand "rm" [Param "-f"] [file]
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{- Adds a file to the annex in direct mode. Can fail, if the file is
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- modified or deleted while it's being added. -}
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addDirect :: FilePath -> InodeCache -> Annex Bool
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addDirect file cache = do
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showStart "add" file
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let source = KeySource
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{ keyFilename = file
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, contentLocation = file
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, inodeCache = Just cache
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}
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got =<< genKey source =<< chooseBackend file
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where
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got Nothing = do
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showEndFail
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return False
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got (Just (key, _)) = ifM (sameInodeCache file [cache])
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( do
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l <- inRepo $ gitAnnexLink file key
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stageSymlink file =<< hashSymlink l
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addInodeCache key cache
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void $ addAssociatedFile key file
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logStatus key InfoPresent
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showEndOk
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return True
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, do
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showEndFail
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return False
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)
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{- In direct mode, git merge would usually refuse to do anything, since it
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- sees present direct mode files as type changed files. To avoid this,
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- merge is run with the work tree set to a temp directory.
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-
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- This should only be used once any changes to the real working tree have
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- already been committed, because it overwrites files in the working tree.
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-}
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mergeDirect :: FilePath -> Git.Ref -> Git.Repo -> IO Bool
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mergeDirect d branch g = do
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createDirectoryIfMissing True d
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let g' = g { location = Local { gitdir = Git.localGitDir g, worktree = Just d } }
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Git.Merge.mergeNonInteractive branch g'
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{- Cleans up after a direct mode merge. The merge must have been committed,
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- and the commit sha passed in, along with the old sha of the tree
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- before the merge. Uses git diff-tree to find files that changed between
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- the two shas, and applies those changes to the work tree.
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-}
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mergeDirectCleanup :: FilePath -> Git.Ref -> Git.Ref -> Annex ()
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mergeDirectCleanup d oldsha newsha = do
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(items, cleanup) <- inRepo $ DiffTree.diffTreeRecursive oldsha newsha
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forM_ items updated
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void $ liftIO cleanup
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liftIO $ removeDirectoryRecursive d
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where
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updated item = do
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go DiffTree.srcsha DiffTree.srcmode moveout moveout_raw
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go DiffTree.dstsha DiffTree.dstmode movein movein_raw
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where
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go getsha getmode a araw
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| getsha item == nullSha = noop
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| isSymLink (getmode item) =
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maybe (araw f) (\k -> void $ a k f)
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=<< catKey (getsha item)
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| otherwise = araw f
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f = DiffTree.file item
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moveout = removeDirect
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{- Files deleted by the merge are removed from the work tree.
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- Empty work tree directories are removed, per git behavior. -}
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moveout_raw f = liftIO $ do
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nukeFile f
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void $ tryIO $ removeDirectory $ parentDir f
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{- If the file is already present, with the right content for the
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- key, it's left alone. Otherwise, create the symlink and then
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- if possible, replace it with the content. -}
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movein k f = unlessM (goodContent k f) $ do
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l <- inRepo $ gitAnnexLink f k
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replaceFile f $ makeAnnexLink l
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toDirect k f
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{- Any new, modified, or renamed files were written to the temp
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- directory by the merge, and are moved to the real work tree. -}
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movein_raw f = liftIO $ do
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createDirectoryIfMissing True $ parentDir f
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void $ tryIO $ rename (d </> f) f
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{- If possible, converts a symlink in the working tree into a direct
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- mode file. -}
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toDirect :: Key -> FilePath -> Annex ()
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toDirect k f = fromMaybe noop =<< toDirectGen k f
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toDirectGen :: Key -> FilePath -> Annex (Maybe (Annex ()))
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toDirectGen k f = do
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loc <- calcRepo $ gitAnnexLocation k
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ifM (liftIO $ doesFileExist loc)
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( fromindirect loc
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, fromdirect
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)
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where
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fromindirect loc = return $ Just $ do
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{- Move content from annex to direct file. -}
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thawContentDir loc
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updateInodeCache k loc
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void $ addAssociatedFile k f
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thawContent loc
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replaceFile f $ liftIO . moveFile loc
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fromdirect = do
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{- Copy content from another direct file. -}
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absf <- liftIO $ absPath f
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locs <- filterM (\loc -> isNothing <$> getAnnexLinkTarget loc) =<<
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(filter (/= absf) <$> addAssociatedFile k f)
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case locs of
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(loc:_) -> return $ Just $ do
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replaceFile f $
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liftIO . void . copyFileExternal loc
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updateInodeCache k f
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_ -> return Nothing
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{- Removes a direct mode file, while retaining its content in the annex
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- (unless its content has already been changed). -}
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removeDirect :: Key -> FilePath -> Annex ()
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removeDirect k f = do
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void $ removeAssociatedFileUnchecked k f
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unlessM (inAnnex k) $
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ifM (goodContent k f)
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( moveAnnex k f
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, logStatus k InfoMissing
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)
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liftIO $ do
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nukeFile f
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void $ tryIO $ removeDirectory $ parentDir f
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{- Called when a direct mode file has been changed. Its old content may be
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- lost. -}
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changedDirect :: Key -> FilePath -> Annex ()
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changedDirect oldk f = do
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locs <- removeAssociatedFile oldk f
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whenM (pure (null locs) <&&> not <$> inAnnex oldk) $
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logStatus oldk InfoMissing
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