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