383 lines
12 KiB
Haskell
383 lines
12 KiB
Haskell
{- git-annex command
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-
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- Copyright 2011 Joachim Breitner <mail@joachim-breitner.de>
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- Copyright 2011-2014 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.Sync where
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import Common.Annex
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import Command
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import qualified Annex
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import qualified Annex.Branch
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import qualified Remote
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import qualified Types.Remote as Remote
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import Annex.Direct
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import Annex.Hook
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import qualified Git.Command
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import qualified Git.LsFiles as LsFiles
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import qualified Git.Branch
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import qualified Git.Ref
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import qualified Git
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import qualified Remote.Git
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import Config
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import Annex.Wanted
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import Annex.Content
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import Command.Get (getKeyFile')
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import qualified Command.Move
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import Logs.Location
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import Annex.Drop
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import Annex.UUID
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import Annex.AutoMerge
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import Annex.Ssh
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import Control.Concurrent.MVar
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cmd :: [Command]
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cmd = [withOptions syncOptions $
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command "sync" (paramOptional (paramRepeating paramRemote))
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seek SectionCommon "synchronize local repository with remotes"]
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syncOptions :: [Option]
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syncOptions = [ contentOption ]
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contentOption :: Option
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contentOption = flagOption [] "content" "also transfer file contents"
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seek :: CommandSeek
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seek rs = do
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prepMerge
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-- There may not be a branch checked out until after the commit,
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-- or perhaps after it gets merged from the remote.
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-- So only look it up once it's needed, and if once there is a
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-- branch, cache it.
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mvar <- liftIO newEmptyMVar
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let getbranch = ifM (liftIO $ isEmptyMVar mvar)
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( do
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branch <- inRepo Git.Branch.current
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when (isJust branch) $
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liftIO $ putMVar mvar branch
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return branch
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, liftIO $ readMVar mvar
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)
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let withbranch a = a =<< getbranch
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remotes <- syncRemotes rs
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let gitremotes = filter Remote.gitSyncableRemote remotes
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let dataremotes = filter (not . remoteAnnexIgnore . Remote.gitconfig) remotes
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-- Syncing involves many actions, any of which can independently
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-- fail, without preventing the others from running.
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seekActions $ return $ concat
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[ [ commit ]
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, [ withbranch mergeLocal ]
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, map (withbranch . pullRemote) gitremotes
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, [ mergeAnnex ]
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]
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whenM (Annex.getFlag $ optionName contentOption) $
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whenM (seekSyncContent dataremotes) $
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-- Transferring content can take a while,
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-- and other changes can be pushed to the git-annex
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-- branch on the remotes in the meantime, so pull
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-- and merge again to avoid our push overwriting
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-- those changes.
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seekActions $ return $ concat
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[ map (withbranch . pullRemote) gitremotes
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, [ commitAnnex, mergeAnnex ]
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]
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seekActions $ return $ concat
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[ [ withbranch pushLocal ]
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, map (withbranch . pushRemote) gitremotes
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]
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{- Merging may delete the current directory, so go to the top
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- of the repo. This also means that sync always acts on all files in the
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- repository, not just on a subdirectory. -}
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prepMerge :: Annex ()
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prepMerge = liftIO . setCurrentDirectory =<< fromRepo Git.repoPath
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syncBranch :: Git.Ref -> Git.Ref
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syncBranch = Git.Ref.under "refs/heads/synced" . fromDirectBranch
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remoteBranch :: Remote -> Git.Ref -> Git.Ref
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remoteBranch remote = Git.Ref.underBase $ "refs/remotes/" ++ Remote.name remote
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syncRemotes :: [String] -> Annex [Remote]
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syncRemotes rs = ifM (Annex.getState Annex.fast) ( nub <$> pickfast , wanted )
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where
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pickfast = (++) <$> listed <*> (filterM good =<< fastest <$> available)
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wanted
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| null rs = filterM good =<< concat . Remote.byCost <$> available
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| otherwise = listed
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listed = catMaybes <$> mapM (Remote.byName . Just) rs
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available = filter (remoteAnnexSync . Remote.gitconfig)
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. filter (not . Remote.isXMPPRemote)
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<$> Remote.remoteList
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good r
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| Remote.gitSyncableRemote r = Remote.Git.repoAvail $ Remote.repo r
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| otherwise = return True
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fastest = fromMaybe [] . headMaybe . Remote.byCost
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commit :: CommandStart
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commit = next $ next $ do
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showStart "commit" ""
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Annex.Branch.commit "update"
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ifM isDirect
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( do
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void stageDirect
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void preCommitDirect
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commitStaged Git.Branch.ManualCommit commitmessage
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, do
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inRepo $ Git.Branch.commitQuiet Git.Branch.ManualCommit
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[ Param "-a"
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, Param "-m"
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, Param commitmessage
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]
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return True
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)
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where
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commitmessage = "git-annex automatic sync"
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commitStaged :: Git.Branch.CommitMode -> String -> Annex Bool
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commitStaged commitmode commitmessage = go =<< inRepo Git.Branch.currentUnsafe
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where
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go Nothing = return False
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go (Just branch) = do
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runAnnexHook preCommitAnnexHook
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parent <- inRepo $ Git.Ref.sha branch
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void $ inRepo $ Git.Branch.commit commitmode False commitmessage branch
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(maybeToList parent)
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return True
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mergeLocal :: Maybe Git.Ref -> CommandStart
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mergeLocal Nothing = stop
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mergeLocal (Just branch) = go =<< needmerge
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where
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syncbranch = syncBranch branch
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needmerge = ifM isBareRepo
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( return False
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, do
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unlessM (inRepo $ Git.Ref.exists syncbranch) $
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inRepo $ updateBranch syncbranch
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inRepo $ Git.Branch.changed branch syncbranch
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)
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go False = stop
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go True = do
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showStart "merge" $ Git.Ref.describe syncbranch
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next $ next $ autoMergeFrom syncbranch (Just branch) Git.Branch.ManualCommit
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pushLocal :: Maybe Git.Ref -> CommandStart
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pushLocal b = do
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updateSyncBranch b
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stop
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updateSyncBranch :: Maybe Git.Ref -> Annex ()
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updateSyncBranch Nothing = noop
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updateSyncBranch (Just branch) = do
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-- Update the sync branch to match the new state of the branch
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inRepo $ updateBranch $ syncBranch branch
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-- In direct mode, we're operating on some special direct mode
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-- branch, rather than the intended branch, so update the indended
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-- branch.
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whenM isDirect $
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inRepo $ updateBranch $ fromDirectBranch branch
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updateBranch :: Git.Ref -> Git.Repo -> IO ()
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updateBranch syncbranch g =
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unlessM go $ error $ "failed to update " ++ Git.fromRef syncbranch
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where
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go = Git.Command.runBool
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[ Param "branch"
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, Param "-f"
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, Param $ Git.fromRef $ Git.Ref.base syncbranch
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] g
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pullRemote :: Remote -> Maybe Git.Ref -> CommandStart
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pullRemote remote branch = do
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showStart "pull" (Remote.name remote)
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next $ do
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showOutput
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stopUnless fetch $
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next $ mergeRemote remote branch
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where
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fetch = inRepoWithSshCachingTo (Remote.repo remote) $ Git.Command.runBool
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[Param "fetch", Param $ Remote.name remote]
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{- The remote probably has both a master and a synced/master branch.
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- Which to merge from? Well, the master has whatever latest changes
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- were committed (or pushed changes, if this is a bare remote),
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- while the synced/master may have changes that some
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- other remote synced to this remote. So, merge them both. -}
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mergeRemote :: Remote -> Maybe Git.Ref -> CommandCleanup
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mergeRemote remote b = case b of
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Nothing -> do
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branch <- inRepo Git.Branch.currentUnsafe
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and <$> mapM (merge Nothing) (branchlist branch)
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Just thisbranch ->
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and <$> (mapM (merge (Just thisbranch)) =<< tomerge (branchlist b))
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where
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merge thisbranch br = autoMergeFrom (remoteBranch remote br) thisbranch Git.Branch.ManualCommit
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tomerge = filterM (changed remote)
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branchlist Nothing = []
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branchlist (Just branch) = [branch, syncBranch branch]
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pushRemote :: Remote -> Maybe Git.Ref -> CommandStart
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pushRemote _remote Nothing = stop
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pushRemote remote (Just branch) = go =<< needpush
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where
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needpush
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| remoteAnnexReadOnly (Remote.gitconfig remote) = return False
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| otherwise = anyM (newer remote) [syncBranch branch, Annex.Branch.name]
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go False = stop
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go True = do
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showStart "push" (Remote.name remote)
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next $ next $ do
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showOutput
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ok <- inRepoWithSshCachingTo (Remote.repo remote) $
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pushBranch remote branch
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unless ok $ do
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warning $ unwords [ "Pushing to " ++ Remote.name remote ++ " failed." ]
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showLongNote "(non-fast-forward problems can be solved by setting receive.denyNonFastforwards to false in the remote's git config)"
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return ok
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{- Pushes a regular branch like master to a remote. Also pushes the git-annex
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- branch.
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-
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- If the remote is a bare git repository, it's best to push the regular
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- branch directly to it, so that cloning/pulling will get it.
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- On the other hand, if it's not bare, pushing to the checked out branch
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- will fail, and this is why we push to its syncBranch.
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-
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- Git offers no way to tell if a remote is bare or not, so both methods
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- are tried.
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-
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- The direct push is likely to spew an ugly error message, so stderr is
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- elided. Since git progress display goes to stderr too, the sync push
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- is done first, and actually sends the data. Then the direct push is
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- tried, with stderr discarded, to update the branch ref on the remote.
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-
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- The sync push forces the update of the remote synced/git-annex branch.
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- This is necessary if a transition has rewritten the git-annex branch.
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- Normally any changes to the git-annex branch get pulled and merged before
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- this push, so this forcing is unlikely to overwrite new data pushed
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- in from another repository that is also syncing.
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-
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- But overwriting of data on synced/git-annex can happen, in a race.
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- The only difference caused by using a forced push in that case is that
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- the last repository to push wins the race, rather than the first to push.
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-
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- The sync push will fail to overwrite if receive.denyNonFastforwards is
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- set on the remote.
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-}
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pushBranch :: Remote -> Git.Ref -> Git.Repo -> IO Bool
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pushBranch remote branch g = tryIO (directpush g) `after` syncpush g
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where
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syncpush = Git.Command.runBool $ pushparams
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[ Git.Branch.forcePush $ refspec Annex.Branch.name
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, refspec branch
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]
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directpush = Git.Command.runQuiet $ pushparams
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[Git.fromRef $ Git.Ref.base $ fromDirectBranch branch]
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pushparams branches =
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[ Param "push"
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, Param $ Remote.name remote
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] ++ map Param branches
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refspec b = concat
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[ Git.fromRef $ Git.Ref.base b
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, ":"
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, Git.fromRef $ Git.Ref.base $ syncBranch b
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]
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commitAnnex :: CommandStart
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commitAnnex = do
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Annex.Branch.commit "update"
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stop
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mergeAnnex :: CommandStart
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mergeAnnex = do
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void Annex.Branch.forceUpdate
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stop
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changed :: Remote -> Git.Ref -> Annex Bool
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changed remote b = do
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let r = remoteBranch remote b
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ifM (inRepo $ Git.Ref.exists r)
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( inRepo $ Git.Branch.changed b r
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, return False
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)
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newer :: Remote -> Git.Ref -> Annex Bool
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newer remote b = do
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let r = remoteBranch remote b
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ifM (inRepo $ Git.Ref.exists r)
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( inRepo $ Git.Branch.changed r b
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, return True
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)
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{- If it's preferred content, and we don't have it, get it from one of the
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- listed remotes (preferring the cheaper earlier ones).
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-
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- Send it to each remote that doesn't have it, and for which it's
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- preferred content.
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-
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- Drop it locally if it's not preferred content (honoring numcopies).
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-
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- Drop it from each remote that has it, where it's not preferred content
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- (honoring numcopies).
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-
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- If any file movements were generated, returns true.
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-}
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seekSyncContent :: [Remote] -> Annex Bool
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seekSyncContent rs = do
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mvar <- liftIO newEmptyMVar
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mapM_ (go mvar) =<< seekHelper LsFiles.inRepo []
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liftIO $ not <$> isEmptyMVar mvar
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where
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go mvar f = ifAnnexed f
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(\v -> void (liftIO (tryPutMVar mvar ())) >> syncFile rs f v)
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noop
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syncFile :: [Remote] -> FilePath -> Key -> Annex ()
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syncFile rs f k = do
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locs <- loggedLocations k
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let (have, lack) = partition (\r -> Remote.uuid r `elem` locs) rs
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got <- anyM id =<< handleget have
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putrs <- catMaybes . snd . unzip <$> (sequence =<< handleput lack)
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u <- getUUID
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let locs' = concat [[u | got], putrs, locs]
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-- Using callCommandAction rather than commandAction for drops,
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-- because a failure to drop does not mean the sync failed.
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handleDropsFrom locs' rs "unwanted" True k (Just f)
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Nothing callCommandAction
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where
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wantget have = allM id
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[ pure (not $ null have)
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, not <$> inAnnex k
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, wantGet True (Just k) (Just f)
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]
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handleget have = ifM (wantget have)
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( return [ get have ]
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, return []
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)
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get have = commandAction $ do
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showStart "get" f
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next $ next $ getViaTmp k $ \dest -> getKeyFile' k (Just f) dest have
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wantput r
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| Remote.readonly r || remoteAnnexReadOnly (Remote.gitconfig r) = return False
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| otherwise = wantSend True (Just k) (Just f) (Remote.uuid r)
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handleput lack = ifM (inAnnex k)
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( map put <$> filterM wantput lack
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, return []
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)
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put dest = do
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ok <- commandAction $ do
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showStart "copy" f
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Command.Move.toStart' dest False (Just f) k
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return (ok, if ok then Just (Remote.uuid dest) else Nothing)
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