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|
{- git-annex command
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
- Copyright 2011 Joachim Breitner <mail@joachim-breitner.de>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE BangPatterns #-}
module Command.Sync where
import Common.Annex
import Command
import qualified Remote
import qualified Annex
import qualified Annex.Branch
import qualified Git.Command
import qualified Git.Branch
import qualified Git.Config
import qualified Git.Ref
import qualified Git
import qualified Types.Remote
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Map as M
def :: [Command]
def = [command "sync" (paramOptional (paramRepeating paramRemote))
[seek] "synchronize local repository with remotes"]
-- syncing involves several operations, any of which can independently fail
seek :: CommandSeek
seek rs = do
!branch <- currentBranch
remotes <- syncRemotes rs
return $ concat $
[ [ commit ]
, [ mergeLocal branch ]
, [ pullRemote remote branch | remote <- remotes ]
, [ mergeAnnex ]
, [ pushLocal branch ]
, [ pushRemote remote branch | remote <- remotes ]
]
syncBranch :: Git.Ref -> Git.Ref
syncBranch = Git.Ref.under "refs/heads/synced/"
remoteBranch :: Remote.Remote Annex -> Git.Ref -> Git.Ref
remoteBranch remote = Git.Ref.under $ "refs/remotes/" ++ Remote.name remote
syncRemotes :: [String] -> Annex [Remote.Remote Annex]
syncRemotes rs = do
fast <- Annex.getState Annex.fast
if fast
then nub <$> pickfast
else wanted
where
pickfast = (++) <$> listed <*> (fastest <$> available)
wanted
| null rs = available
| otherwise = listed
listed = mapM Remote.byName rs
available = filterM hasurl =<< Remote.enabledRemoteList
hasurl r = not . null <$> geturl r
geturl r = fromRepo $ Git.Config.get ("remote." ++ Remote.name r ++ ".url") ""
fastest = fromMaybe [] . headMaybe .
map snd . sort . M.toList . costmap
costmap = M.fromListWith (++) . map costpair
costpair r = (Types.Remote.cost r, [r])
commit :: CommandStart
commit = do
showStart "commit" ""
next $ next $ do
showOutput
-- Commit will fail when the tree is clean, so ignore failure.
_ <- inRepo $ Git.Command.runBool "commit"
[Param "-a", Param "-m", Param "git-annex automatic sync"]
return True
mergeLocal :: Git.Ref -> CommandStart
mergeLocal branch = go =<< needmerge
where
syncbranch = syncBranch branch
needmerge = do
unlessM (inRepo $ Git.Ref.exists syncbranch) $
updateBranch syncbranch
inRepo $ Git.Branch.changed branch syncbranch
go False = stop
go True = do
showStart "merge" $ Git.Ref.describe syncbranch
next $ next $ mergeFrom syncbranch
pushLocal :: Git.Ref -> CommandStart
pushLocal branch = do
updateBranch $ syncBranch branch
stop
updateBranch :: Git.Ref -> Annex ()
updateBranch syncbranch =
unlessM go $ error $ "failed to update " ++ show syncbranch
where
go = inRepo $ Git.Command.runBool "branch"
[ Param "-f"
, Param $ show $ Git.Ref.base syncbranch
]
pullRemote :: Remote.Remote Annex -> Git.Ref -> CommandStart
pullRemote remote branch = do
showStart "pull" (Remote.name remote)
next $ do
showOutput
fetched <- inRepo $ Git.Command.runBool "fetch"
[Param $ Remote.name remote]
if fetched
then next $ mergeRemote remote branch
else stop
{- The remote probably has both a master and a synced/master branch.
- Which to merge from? Well, the master has whatever latest changes
- were committed, while the synced/master may have changes that some
- other remote synced to this remote. So, merge them both. -}
mergeRemote :: Remote.Remote Annex -> Git.Ref -> CommandCleanup
mergeRemote remote branch = all id <$> (mapM merge =<< tomerge)
where
merge = mergeFrom . remoteBranch remote
tomerge = filterM (changed remote) [branch, syncBranch branch]
pushRemote :: Remote.Remote Annex -> Git.Ref -> CommandStart
pushRemote remote branch = go =<< needpush
where
needpush = anyM (newer remote) [syncbranch, Annex.Branch.name]
go False = stop
go True = do
showStart "push" (Remote.name remote)
next $ next $ do
showOutput
inRepo $ Git.Command.runBool "push" $
[ Param (Remote.name remote)
, Param (show $ Annex.Branch.name)
, Param refspec
]
refspec = show (Git.Ref.base branch) ++ ":" ++ show (Git.Ref.base syncbranch)
syncbranch = syncBranch branch
mergeAnnex :: CommandStart
mergeAnnex = do
Annex.Branch.forceUpdate
stop
currentBranch :: Annex Git.Ref
currentBranch = Git.Ref . firstLine . L.unpack <$>
inRepo (Git.Command.pipeRead [Param "symbolic-ref", Param "HEAD"])
mergeFrom :: Git.Ref -> CommandCleanup
mergeFrom branch = do
showOutput
inRepo $ Git.Command.runBool "merge" [Param $ show branch]
changed :: Remote.Remote Annex -> Git.Ref -> Annex Bool
changed remote b = do
let r = remoteBranch remote b
e <- inRepo $ Git.Ref.exists r
if e
then inRepo $ Git.Branch.changed b r
else return False
newer :: Remote.Remote Annex -> Git.Ref -> Annex Bool
newer remote b = do
let r = remoteBranch remote b
e <- inRepo $ Git.Ref.exists r
if e
then inRepo $ Git.Branch.changed r b
else return True
|
