4e0be2792b
Removed instance, got it all to build using fromRef. (With a few things that really need to show something using a ref for debugging stubbed out.) Then added back Read instance, and made Logs.View use it for serialization. This changes the view log format.
586 lines
18 KiB
Haskell
586 lines
18 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 Annex.Queue
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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.CatFile
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import Annex.Link
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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.Merge
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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 Git.Types (BlobType(..))
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import qualified Types.Remote
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import qualified Remote.Git
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import Types.Key
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import Config
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import Annex.ReplaceFile
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import Git.FileMode
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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 qualified Data.Set as S
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import Data.Hash.MD5
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import Control.Concurrent.MVar
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def :: [Command]
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def = [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 <$> mapM (Remote.byName . Just) rs
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available = filter (remoteAnnexSync . Types.Remote.gitconfig)
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. filter (not . Remote.isXMPPRemote)
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<$> Remote.remoteList
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good r
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| Remote.gitSyncableRemote r = Remote.Git.repoAvail $ Types.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 $ ifM isDirect
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( do
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showStart "commit" ""
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void stageDirect
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void preCommitDirect
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commitStaged commitmessage
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, do
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showStart "commit" ""
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Annex.Branch.commit "update"
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-- Commit will fail when the tree is clean, so ignore failure.
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_ <- inRepo $ tryIO . Git.Command.runQuiet
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[ Param "commit"
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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 :: String -> Annex Bool
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commitStaged 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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parent <- inRepo $ Git.Ref.sha branch
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void $ inRepo $ Git.Branch.commit 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 $ mergeFrom syncbranch
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pushLocal :: Maybe Git.Ref -> CommandStart
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pushLocal Nothing = stop
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pushLocal (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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stop
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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 = inRepo $ 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 <$> mapM merge (branchlist branch)
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Just _ -> and <$> (mapM merge =<< tomerge (branchlist b))
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where
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merge = mergeFrom . remoteBranch remote
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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 (Types.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 <- inRepo $ 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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{- Merges from a branch into the current branch. -}
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mergeFrom :: Git.Ref -> Annex Bool
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mergeFrom branch = do
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showOutput
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ifM isDirect
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( maybe go godirect =<< inRepo Git.Branch.current
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, go
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)
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where
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go = runmerge $ inRepo $ Git.Merge.mergeNonInteractive branch
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godirect currbranch = do
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old <- inRepo $ Git.Ref.sha currbranch
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d <- fromRepo gitAnnexMergeDir
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r <- runmerge $ inRepo $ mergeDirect d branch
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new <- inRepo $ Git.Ref.sha currbranch
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case (old, new) of
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(Just oldsha, Just newsha) ->
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mergeDirectCleanup d oldsha newsha
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_ -> noop
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return r
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runmerge a = ifM a
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( return True
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, resolveMerge
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)
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{- Resolves a conflicted merge. It's important that any conflicts be
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- resolved in a way that itself avoids later merge conflicts, since
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- multiple repositories may be doing this concurrently.
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-
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- Only annexed files are resolved; other files are left for the user to
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- handle.
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-
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- This uses the Keys pointed to by the files to construct new
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- filenames. So when both sides modified file foo,
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- it will be deleted, and replaced with files foo.variant-A and
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- foo.variant-B.
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-
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- On the other hand, when one side deleted foo, and the other modified it,
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- it will be deleted, and the modified version stored as file
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- foo.variant-A (or B).
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-
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- It's also possible that one side has foo as an annexed file, and
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- the other as a directory or non-annexed file. The annexed file
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- is renamed to resolve the merge, and the other object is preserved as-is.
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-}
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resolveMerge :: Annex Bool
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resolveMerge = do
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top <- fromRepo Git.repoPath
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(fs, cleanup) <- inRepo (LsFiles.unmerged [top])
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mergedfs <- catMaybes <$> mapM resolveMerge' fs
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let merged = not (null mergedfs)
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void $ liftIO cleanup
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(deleted, cleanup2) <- inRepo (LsFiles.deleted [top])
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unless (null deleted) $
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Annex.Queue.addCommand "rm" [Params "--quiet -f --"] deleted
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void $ liftIO cleanup2
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when merged $ do
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unlessM isDirect $
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cleanConflictCruft mergedfs top
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Annex.Queue.flush
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void $ inRepo $ Git.Command.runBool
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[ Param "commit"
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, Param "-m"
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, Param "git-annex automatic merge conflict fix"
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]
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showLongNote "Merge conflict was automatically resolved; you may want to examine the result."
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return merged
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resolveMerge' :: LsFiles.Unmerged -> Annex (Maybe FilePath)
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resolveMerge' u
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| issymlink LsFiles.valUs && issymlink LsFiles.valThem = do
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kus <- getKey LsFiles.valUs
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kthem <- getKey LsFiles.valThem
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case (kus, kthem) of
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-- Both sides of conflict are annexed files
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(Just keyUs, Just keyThem) -> do
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removeoldfile keyUs
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if keyUs == keyThem
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then makelink keyUs
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else do
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makelink keyUs
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makelink keyThem
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return $ Just file
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-- Our side is annexed, other side is not.
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(Just keyUs, Nothing) -> do
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ifM isDirect
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( do
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removeoldfile keyUs
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makelink keyUs
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movefromdirectmerge file
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, do
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unstageoldfile
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makelink keyUs
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)
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return $ Just file
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-- Our side is not annexed, other side is.
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(Nothing, Just keyThem) -> do
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makelink keyThem
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unstageoldfile
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return $ Just file
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-- Neither side is annexed; cannot resolve.
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(Nothing, Nothing) -> return Nothing
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| otherwise = return Nothing
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where
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file = LsFiles.unmergedFile u
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issymlink select = select (LsFiles.unmergedBlobType u) `elem` [Just SymlinkBlob, Nothing]
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makelink key = do
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let dest = mergeFile file key
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l <- inRepo $ gitAnnexLink dest key
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replaceFile dest $ makeAnnexLink l
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stageSymlink dest =<< hashSymlink l
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whenM isDirect $
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toDirect key dest
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removeoldfile keyUs = do
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ifM isDirect
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( removeDirect keyUs file
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, liftIO $ nukeFile file
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)
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Annex.Queue.addCommand "rm" [Params "--quiet -f --"] [file]
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unstageoldfile = Annex.Queue.addCommand "rm" [Params "--quiet -f --cached --"] [file]
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getKey select = case select (LsFiles.unmergedSha u) of
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Nothing -> return Nothing
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Just sha -> catKey sha symLinkMode
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{- Move something out of the direct mode merge directory and into
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- the git work tree.
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-
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- On a filesystem not supporting symlinks, this is complicated
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- because a directory may contain annex links, but just
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- moving them into the work tree will not let git know they are
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- symlinks.
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-
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- Also, if the content of the file is available, make it available
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- in direct mode.
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-}
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movefromdirectmerge item = do
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d <- fromRepo gitAnnexMergeDir
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liftIO $ rename (d </> item) item
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mapM_ setuplink =<< liftIO (dirContentsRecursive item)
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setuplink f = do
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v <- getAnnexLinkTarget f
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case v of
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Nothing -> noop
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Just target -> do
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unlessM (coreSymlinks <$> Annex.getGitConfig) $
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addAnnexLink target f
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maybe noop (`toDirect` f)
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(fileKey (takeFileName target))
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{- git-merge moves conflicting files away to files
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- named something like f~HEAD or f~branch, but the
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- exact name chosen can vary. Once the conflict is resolved,
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- this cruft can be deleted. To avoid deleting legitimate
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- files that look like this, only delete files that are
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- A) not staged in git and B) look like git-annex symlinks.
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-}
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cleanConflictCruft :: [FilePath] -> FilePath -> Annex ()
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cleanConflictCruft resolvedfs top = do
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(fs, cleanup) <- inRepo $ LsFiles.notInRepo False [top]
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mapM_ clean fs
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void $ liftIO cleanup
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where
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clean f
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liftIO $ nukeFile f
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| otherwise = noop
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s = S.fromList resolvedfs
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matchesresolved f = S.member (base f) s
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base f = reverse $ drop 1 $ dropWhile (/= '~') $ reverse f
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{- The filename to use when resolving a conflicted merge of a file,
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- that points to a key.
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-
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- Something derived from the key needs to be included in the filename,
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- but rather than exposing the whole key to the user, a very weak hash
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- is used. There is a very real, although still unlikely, chance of
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- conflicts using this hash.
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-
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- In the event that there is a conflict with the filename generated
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- for some other key, that conflict will itself be handled by the
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- conflicted merge resolution code. That case is detected, and the full
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- key is used in the filename.
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-}
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mergeFile :: FilePath -> Key -> FilePath
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mergeFile file key
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| doubleconflict = go $ key2file key
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| otherwise = go $ shortHash $ key2file key
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where
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varmarker = ".variant-"
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doubleconflict = varmarker `isInfixOf` file
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go v = takeDirectory file
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</> dropExtension (takeFileName file)
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++ varmarker ++ v
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++ takeExtension file
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shortHash :: String -> String
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shortHash = take 4 . md5s . md5FilePath
|
|
|
|
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
|
|
)
|
|
|
|
{- If it's preferred content, and we don't have it, get it from one of the
|
|
- listed remotes (preferring the cheaper earlier ones).
|
|
-
|
|
- Send it to each remote that doesn't have it, and for which it's
|
|
- preferred content.
|
|
-
|
|
- Drop it locally if it's not preferred content (honoring numcopies).
|
|
-
|
|
- Drop it from each remote that has it, where it's not preferred content
|
|
- (honoring numcopies).
|
|
-
|
|
- If any file movements were generated, returns true.
|
|
-}
|
|
seekSyncContent :: [Remote] -> Annex Bool
|
|
seekSyncContent rs = do
|
|
mvar <- liftIO newEmptyMVar
|
|
mapM_ (go mvar) =<< seekHelper LsFiles.inRepo []
|
|
liftIO $ not <$> isEmptyMVar mvar
|
|
where
|
|
go mvar f = ifAnnexed f
|
|
(\v -> void (liftIO (tryPutMVar mvar ())) >> syncFile rs f v)
|
|
noop
|
|
|
|
syncFile :: [Remote] -> FilePath -> (Key, Backend) -> Annex ()
|
|
syncFile rs f (k, _) = do
|
|
locs <- loggedLocations k
|
|
let (have, lack) = partition (\r -> Remote.uuid r `elem` locs) rs
|
|
|
|
got <- anyM id =<< handleget have
|
|
putrs <- catMaybes . snd . unzip <$> (sequence =<< handleput lack)
|
|
|
|
u <- getUUID
|
|
let locs' = concat [[u | got], putrs, locs]
|
|
|
|
-- Using callCommandAction rather than commandAction for drops,
|
|
-- because a failure to drop does not mean the sync failed.
|
|
handleDropsFrom locs' rs "unwanted" True k (Just f)
|
|
Nothing callCommandAction
|
|
where
|
|
wantget have = allM id
|
|
[ pure (not $ null have)
|
|
, not <$> inAnnex k
|
|
, wantGet True (Just k) (Just f)
|
|
]
|
|
handleget have = ifM (wantget have)
|
|
( return [ get have ]
|
|
, return []
|
|
)
|
|
get have = commandAction $ do
|
|
showStart "get" f
|
|
next $ next $ getViaTmp k $ \dest -> getKeyFile' k (Just f) dest have
|
|
|
|
wantput r
|
|
| Remote.readonly r || remoteAnnexReadOnly (Types.Remote.gitconfig r) = return False
|
|
| otherwise = wantSend True (Just k) (Just f) (Remote.uuid r)
|
|
handleput lack = ifM (inAnnex k)
|
|
( map put <$> filterM wantput lack
|
|
, return []
|
|
)
|
|
put dest = do
|
|
ok <- commandAction $ do
|
|
showStart "copy" f
|
|
next $ Command.Move.toPerform dest False k (Just f)
|
|
return (ok, if ok then Just (Remote.uuid dest) else Nothing)
|