71 lines
2.2 KiB
Haskell
71 lines
2.2 KiB
Haskell
{- Temporarily changing the files git uses.
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-
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- Copyright 2014-2016 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.GitOverlay where
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import qualified Control.Exception as E
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import Annex.Common
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import Git
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import Git.Types
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import Git.Env
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import qualified Annex
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{- Runs an action using a different git index file. -}
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withIndexFile :: FilePath -> Annex a -> Annex a
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withIndexFile f = withAltRepo
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(\g -> addGitEnv g "GIT_INDEX_FILE" f)
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(\g g' -> g' { gitEnv = gitEnv g })
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{- Runs an action using a different git work tree.
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-
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- Smudge and clean filters are disabled in this work tree. -}
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withWorkTree :: FilePath -> Annex a -> Annex a
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withWorkTree d = withAltRepo
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(\g -> return $ g { location = modlocation (location g), gitGlobalOpts = gitGlobalOpts g ++ disableSmudgeConfig })
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(\g g' -> g' { location = location g, gitGlobalOpts = gitGlobalOpts g })
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where
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modlocation l@(Local {}) = l { worktree = Just d }
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modlocation _ = error "withWorkTree of non-local git repo"
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disableSmudgeConfig = map Param
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[ "-c", "filter.annex.smudge="
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, "-c", "filter.annex.clean="
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]
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{- Runs an action with the git index file and HEAD, and a few other
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- files that are related to the work tree coming from an overlay
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- directory other than the usual. This is done by pointing
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- GIT_COMMON_DIR at the regular git directory, and GIT_DIR at the
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- overlay directory. -}
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withWorkTreeRelated :: FilePath -> Annex a -> Annex a
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withWorkTreeRelated d = withAltRepo modrepo unmodrepo
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where
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modrepo g = do
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g' <- addGitEnv g "GIT_COMMON_DIR" =<< absPath (localGitDir g)
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g'' <- addGitEnv g' "GIT_DIR" d
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return (g'' { gitEnvOverridesGitDir = True })
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unmodrepo g g' = g'
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{ gitEnv = gitEnv g
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, gitEnvOverridesGitDir = gitEnvOverridesGitDir g
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}
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withAltRepo
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:: (Repo -> IO Repo)
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-- ^ modify Repo
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-> (Repo -> Repo -> Repo)
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-- ^ undo modifications; first Repo is the original and second
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-- is the one after running the action.
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-> Annex a
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-> Annex a
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withAltRepo modrepo unmodrepo a = do
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g <- gitRepo
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g' <- liftIO $ modrepo g
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r <- tryNonAsync $ do
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Annex.changeState $ \s -> s { Annex.repo = g' }
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a
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Annex.changeState $ \s -> s { Annex.repo = unmodrepo g (Annex.repo s) }
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either E.throw return r
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