120 lines
3.5 KiB
Haskell
120 lines
3.5 KiB
Haskell
{- git-annex assistant git merge thread
|
|
-
|
|
- Copyright 2012 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Assistant.Threads.Merger where
|
|
|
|
import Assistant.Common
|
|
import Assistant.TransferQueue
|
|
import Assistant.BranchChange
|
|
import Assistant.DaemonStatus
|
|
import Assistant.ScanRemotes
|
|
import Utility.DirWatcher
|
|
import Utility.DirWatcher.Types
|
|
import qualified Annex.Branch
|
|
import qualified Git
|
|
import qualified Git.Branch
|
|
import Annex.AutoMerge
|
|
import Annex.TaggedPush
|
|
import Remote (remoteFromUUID)
|
|
|
|
import qualified Data.Set as S
|
|
import qualified Data.Text as T
|
|
|
|
{- This thread watches for changes to .git/refs/, and handles incoming
|
|
- pushes. -}
|
|
mergeThread :: NamedThread
|
|
mergeThread = namedThread "Merger" $ do
|
|
g <- liftAnnex gitRepo
|
|
let dir = Git.localGitDir g </> "refs"
|
|
liftIO $ createDirectoryIfMissing True dir
|
|
let hook a = Just <$> asIO2 (runHandler a)
|
|
changehook <- hook onChange
|
|
errhook <- hook onErr
|
|
let hooks = mkWatchHooks
|
|
{ addHook = changehook
|
|
, modifyHook = changehook
|
|
, errHook = errhook
|
|
}
|
|
void $ liftIO $ watchDir dir (const False) True hooks id
|
|
debug ["watching", dir]
|
|
|
|
type Handler = FilePath -> Assistant ()
|
|
|
|
{- Runs an action handler.
|
|
-
|
|
- Exceptions are ignored, otherwise a whole thread could be crashed.
|
|
-}
|
|
runHandler :: Handler -> FilePath -> Maybe FileStatus -> Assistant ()
|
|
runHandler handler file _filestatus =
|
|
either (liftIO . print) (const noop) =<< tryIO <~> handler file
|
|
|
|
{- Called when there's an error with inotify. -}
|
|
onErr :: Handler
|
|
onErr = error
|
|
|
|
{- Called when a new branch ref is written, or a branch ref is modified.
|
|
-
|
|
- At startup, synthetic add events fire, causing this to run, but that's
|
|
- ok; it ensures that any changes pushed since the last time the assistant
|
|
- ran are merged in.
|
|
-}
|
|
onChange :: Handler
|
|
onChange file
|
|
| ".lock" `isSuffixOf` file = noop
|
|
| isAnnexBranch file = do
|
|
branchChanged
|
|
diverged <- liftAnnex Annex.Branch.forceUpdate
|
|
when diverged $
|
|
unlessM handleDesynced $
|
|
queueDeferredDownloads "retrying deferred download" Later
|
|
| "/synced/" `isInfixOf` file =
|
|
mergecurrent =<< liftAnnex (inRepo Git.Branch.current)
|
|
| otherwise = noop
|
|
where
|
|
changedbranch = fileToBranch file
|
|
|
|
mergecurrent (Just current)
|
|
| equivBranches changedbranch current = do
|
|
void $ liftAnnex $ autoMergeFrom changedbranch (Just current) Git.Branch.AutomaticCommit
|
|
whenM (liftAnnex $ inRepo $ Git.Branch.changed current changedbranch) $ do
|
|
debug
|
|
[ "merging", Git.fromRef changedbranch
|
|
, "into", Git.fromRef current
|
|
]
|
|
void $ liftAnnex $ autoMergeFrom changedbranch (Just current) Git.Branch.AutomaticCommit
|
|
mergecurrent _ = noop
|
|
|
|
handleDesynced = case fromTaggedBranch changedbranch of
|
|
Nothing -> return False
|
|
Just (u, info) -> do
|
|
mr <- liftAnnex $ remoteFromUUID u
|
|
case mr of
|
|
Nothing -> return False
|
|
Just r -> do
|
|
s <- desynced <$> getDaemonStatus
|
|
if S.member u s || Just (T.unpack $ getXMPPClientID r) == info
|
|
then do
|
|
modifyDaemonStatus_ $ \st -> st
|
|
{ desynced = S.delete u s }
|
|
addScanRemotes True [r]
|
|
return True
|
|
else return False
|
|
|
|
equivBranches :: Git.Ref -> Git.Ref -> Bool
|
|
equivBranches x y = base x == base y
|
|
where
|
|
base = takeFileName . Git.fromRef
|
|
|
|
isAnnexBranch :: FilePath -> Bool
|
|
isAnnexBranch f = n `isSuffixOf` f
|
|
where
|
|
n = '/' : Git.fromRef Annex.Branch.name
|
|
|
|
fileToBranch :: FilePath -> Git.Ref
|
|
fileToBranch f = Git.Ref $ "refs" </> base
|
|
where
|
|
base = Prelude.last $ split "/refs/" f
|