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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.Ref
import qualified Git
import qualified Types.Remote
import qualified Remote.Git
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 <- fromMaybe nobranch <$> inRepo Git.Branch.current
remotes <- syncRemotes rs
return $ concat
[ [ commit ]
, [ mergeLocal branch ]
, [ pullRemote remote branch | remote <- remotes ]
, [ mergeAnnex ]
, [ pushLocal branch ]
, [ pushRemote remote branch | remote <- remotes ]
]
where
nobranch = error "no branch is checked out"
syncBranch :: Git.Ref -> Git.Ref
syncBranch = Git.Ref.under "refs/heads/synced/"
remoteBranch :: Remote -> Git.Ref -> Git.Ref
remoteBranch remote = Git.Ref.under $ "refs/remotes/" ++ Remote.name remote
syncRemotes :: [String] -> Annex [Remote]
syncRemotes rs = ifM (Annex.getState Annex.fast) ( nub <$> pickfast , wanted )
where
pickfast = (++) <$> listed <*> (good =<< fastest <$> available)
wanted
| null rs = good =<< concat . byspeed <$> available
| otherwise = listed
listed = do
l <- catMaybes <$> mapM (Remote.byName . Just) rs
let s = filter special l
unless (null s) $
error $ "cannot sync special remotes: " ++
unwords (map Types.Remote.name s)
return l
available = filter nonspecial <$> Remote.enabledRemoteList
good = filterM $ Remote.Git.repoAvail . Types.Remote.repo
nonspecial r = Types.Remote.remotetype r == Remote.Git.remote
special = not . nonspecial
fastest = fromMaybe [] . headMaybe . byspeed
byspeed = 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
Annex.Branch.commit "update"
-- 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 -> Git.Ref -> CommandStart
pullRemote remote branch = do
showStart "pull" (Remote.name remote)
next $ do
showOutput
stopUnless fetch $
next $ mergeRemote remote branch
where
fetch = inRepo $ Git.Command.runBool "fetch"
[Param $ Remote.name remote]
{- 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 -> 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 -> 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
mergeFrom :: Git.Ref -> CommandCleanup
mergeFrom branch = do
showOutput
inRepo $ Git.Command.runBool "merge" [Param $ show branch]
changed :: Remote -> Git.Ref -> Annex Bool
changed remote b = do
let r = remoteBranch remote b
ifM (inRepo $ Git.Ref.exists r)
( inRepo $ Git.Branch.changed b r
, return False
)
newer :: Remote -> Git.Ref -> Annex Bool
newer remote b = do
let r = remoteBranch remote b
ifM (inRepo $ Git.Ref.exists r)
( inRepo $ Git.Branch.changed r b
, return True
)
|
