40df015d90
There are two types of equality here, and which one is right varies, so this forces me to consider and choose between them. Based on this, I learned that the commit in git anex sync was always doing a strong comparison, even when in a repository where the inodes had changed. Fixed that.
211 lines
6.5 KiB
Haskell
211 lines
6.5 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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{- 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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mkey <- catKey sha
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mstat <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus file
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case (mkey, mstat, toInodeCache =<< mstat) of
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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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Nothing -> modifiedannexed file key cache
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Just c -> unlessM (compareInodeCaches c cache) $
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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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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 $ Just cache)
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( do
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stageSymlink file =<< hashSymlink =<< calcGitLink file key
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writeInodeCache 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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{- The symlink is created from the key, rather than moving in the
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- symlink created in the temp directory by the merge. This because
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- a conflicted merge will write to some other file in the temp
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- directory.
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-
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- Symlinks are replaced with their content, if it's available. -}
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movein k f = do
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l <- calcGitLink f k
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replaceFile f $
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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 <- inRepo $ gitAnnexLocation k
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absf <- liftIO $ absPath f
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locs <- filter (/= absf) <$> addAssociatedFile k f
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case locs of
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[] -> ifM (liftIO $ doesFileExist loc)
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( return $ Just $ do
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{- Move content from annex to direct file. -}
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updateInodeCache k loc
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thawContent loc
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replaceFile f $
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liftIO . moveFile loc
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, return Nothing
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)
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(loc':_) -> ifM (isNothing <$> getAnnexLinkTarget loc')
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{- Another direct file has the content; copy it. -}
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( return $ Just $
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replaceFile f $
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void . liftIO . copyFileExternal loc'
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, return Nothing
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)
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{- Removes a direct mode file, while retaining its content. -}
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removeDirect :: Key -> FilePath -> Annex ()
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removeDirect k f = do
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locs <- removeAssociatedFile k f
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when (null locs) $
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whenM (isNothing <$> getAnnexLinkTarget f) $
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moveAnnex k f
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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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