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{- git-annex tagged pushes
-
- Copyright 2012 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.TaggedPush where
import Annex.Common
import qualified Remote
import qualified Annex.Branch
import qualified Git
import qualified Git.Ref
import qualified Git.Command
import qualified Git.Branch
import Utility.Base64
{- Converts a git branch into a branch that is tagged with a UUID, typically
- the UUID of the repo that will be pushing it, and possibly with other
- information.
-
- Pushing to branches on the remote that have our uuid in them is ugly,
- but it reserves those branches for pushing by us, and so our pushes will
- never conflict with other pushes.
-
- To avoid cluttering up the branch display, the branch is put under
- refs/synced/, rather than the usual refs/remotes/
-
- Both UUIDs and Base64 encoded data are always legal to be used in git
- refs, per git-check-ref-format.
-}
toTaggedBranch :: UUID -> Maybe String -> Git.Branch -> Git.Branch
toTaggedBranch u info b = Git.Ref $ intercalate "/" $ catMaybes
[ Just "refs/synced"
, Just $ fromUUID u
, toB64 <$> info
, Just $ Git.fromRef $ Git.Ref.base b
]
fromTaggedBranch :: Git.Branch -> Maybe (UUID, Maybe String)
fromTaggedBranch b = case split "/" $ Git.fromRef b of
("refs":"synced":u:info:_base) ->
Just (toUUID u, fromB64Maybe info)
("refs":"synced":u:_base) ->
Just (toUUID u, Nothing)
_ -> Nothing
taggedPush :: UUID -> Maybe String -> Git.Ref -> Remote -> Git.Repo -> IO Bool
taggedPush u info branch remote = Git.Command.runBool
[ Param "push"
, Param $ Remote.name remote
{- Using forcePush here is safe because we "own" the tagged branch
- we're pushing; it has no other writers. Ensures it is pushed
- even if it has been rewritten by a transition. -}
, Param $ Git.Branch.forcePush $ refspec Annex.Branch.name
, Param $ refspec branch
]
where
refspec b = Git.fromRef b ++ ":" ++ Git.fromRef (toTaggedBranch u info b)
|
