175 lines
5 KiB
Haskell
175 lines
5 KiB
Haskell
{- git-annex command
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-
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- Copyright 2011 Joey Hess <joey@kitenet.net>
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- Copyright 2011 Joachim Breitner <mail@joachim-breitner.de>
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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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{-# LANGUAGE BangPatterns #-}
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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 Remote
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import qualified Annex
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import qualified Annex.Branch
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import qualified Git.Command
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import qualified Git.Branch
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import qualified Git.Config
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import qualified Git.Ref
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import qualified Git
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import qualified Types.Remote
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import qualified Data.ByteString.Lazy.Char8 as L
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import qualified Data.Map as M
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def :: [Command]
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def = [command "sync" (paramOptional (paramRepeating paramRemote))
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[seek] "synchronize local repository with remotes"]
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-- syncing involves several operations, any of which can independently fail
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seek :: CommandSeek
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seek rs = do
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!branch <- currentBranch
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remotes <- syncRemotes rs
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return $ concat $
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[ [ commit ]
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, [ mergeLocal branch ]
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, [ pullRemote remote branch | remote <- remotes ]
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, [ mergeAnnex ]
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, [ pushLocal branch ]
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, [ pushRemote remote branch | remote <- remotes ]
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]
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syncBranch :: Git.Ref -> Git.Ref
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syncBranch = Git.Ref.under "refs/heads/synced/"
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remoteBranch :: Remote.Remote Annex -> Git.Ref -> Git.Ref
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remoteBranch remote = Git.Ref.under $ "refs/remotes/" ++ Remote.name remote
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syncRemotes :: [String] -> Annex [Remote.Remote Annex]
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syncRemotes rs = do
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fast <- Annex.getState Annex.fast
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if fast
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then nub <$> pickfast
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else wanted
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where
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pickfast = (++) <$> listed <*> (fastest <$> available)
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wanted
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| null rs = available
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| otherwise = listed
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listed = mapM Remote.byName rs
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available = filterM hasurl =<< Remote.enabledRemoteList
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hasurl r = not . null <$> geturl r
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geturl r = fromRepo $ Git.Config.get ("remote." ++ Remote.name r ++ ".url") ""
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fastest = fromMaybe [] . headMaybe .
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map snd . sort . M.toList . costmap
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costmap = M.fromListWith (++) . map costpair
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costpair r = (Types.Remote.cost r, [r])
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commit :: CommandStart
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commit = do
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showStart "commit" ""
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next $ next $ do
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showOutput
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-- Commit will fail when the tree is clean, so ignore failure.
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_ <- inRepo $ Git.Command.runBool "commit"
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[Param "-a", Param "-m", Param "git-annex automatic sync"]
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return True
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mergeLocal :: Git.Ref -> CommandStart
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mergeLocal branch = go =<< needmerge
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where
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syncbranch = syncBranch branch
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needmerge = do
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unlessM (inRepo $ Git.Ref.exists syncbranch) $
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updateBranch syncbranch
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inRepo $ Git.Branch.changed branch syncbranch
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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 $ mergeFrom syncbranch
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pushLocal :: Git.Ref -> CommandStart
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pushLocal branch = do
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updateBranch $ syncBranch branch
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stop
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updateBranch :: Git.Ref -> Annex ()
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updateBranch syncbranch =
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unlessM go $ error $ "failed to update " ++ show syncbranch
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where
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go = inRepo $ Git.Command.runBool "branch"
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[ Param "-f"
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, Param $ show $ Git.Ref.base syncbranch
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]
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pullRemote :: Remote.Remote Annex -> 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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fetched <- inRepo $ Git.Command.runBool "fetch"
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[Param $ Remote.name remote]
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if fetched
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then next $ mergeRemote remote branch
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else stop
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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, 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.Remote Annex -> Git.Ref -> CommandCleanup
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mergeRemote remote branch = all id <$> (mapM merge =<< tomerge)
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where
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merge = mergeFrom . remoteBranch remote
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tomerge = filterM (changed remote) [branch, syncBranch branch]
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pushRemote :: Remote.Remote Annex -> Git.Ref -> CommandStart
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pushRemote remote branch = go =<< needpush
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where
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needpush = anyM (newer remote) [syncbranch, 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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inRepo $ Git.Command.runBool "push" $
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[ Param (Remote.name remote)
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, Param (show $ Annex.Branch.name)
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, Param refspec
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]
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refspec = show (Git.Ref.base branch) ++ ":" ++ show (Git.Ref.base syncbranch)
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syncbranch = syncBranch branch
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mergeAnnex :: CommandStart
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mergeAnnex = do
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Annex.Branch.forceUpdate
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stop
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currentBranch :: Annex Git.Ref
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currentBranch = Git.Ref . firstLine . L.unpack <$>
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inRepo (Git.Command.pipeRead [Param "symbolic-ref", Param "HEAD"])
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mergeFrom :: Git.Ref -> CommandCleanup
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mergeFrom branch = do
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showOutput
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inRepo $ Git.Command.runBool "merge" [Param $ show branch]
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changed :: Remote.Remote Annex -> 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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e <- inRepo $ Git.Ref.exists r
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if e
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then inRepo $ Git.Branch.changed b r
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else return False
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newer :: Remote.Remote Annex -> 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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e <- inRepo $ Git.Ref.exists r
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if e
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then inRepo $ Git.Branch.changed r b
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else return True
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