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{- git cat-file interface, with handle automatically stored in the Annex monad
-
- Copyright 2011-2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.CatFile (
catFile,
catObject,
catObjectDetails,
catFileHandle,
catKey,
catKeyFile,
) where
import qualified Data.ByteString.Lazy as L
import qualified Data.Map as M
import Common.Annex
import qualified Git
import qualified Git.CatFile
import qualified Annex
import Git.Types
import Git.FilePath
catFile :: Git.Branch -> FilePath -> Annex L.ByteString
catFile branch file = do
h <- catFileHandle
liftIO $ Git.CatFile.catFile h branch file
catObject :: Git.Ref -> Annex L.ByteString
catObject ref = do
h <- catFileHandle
liftIO $ Git.CatFile.catObject h ref
catObjectDetails :: Git.Ref -> Annex (Maybe (L.ByteString, Sha))
catObjectDetails ref = do
h <- catFileHandle
liftIO $ Git.CatFile.catObjectDetails h ref
{- There can be multiple index files, and a different cat-file is needed
- for each. This is selected by setting GIT_INDEX_FILE in the gitEnv. -}
catFileHandle :: Annex Git.CatFile.CatFileHandle
catFileHandle = do
m <- Annex.getState Annex.catfilehandles
indexfile <- fromMaybe "" . maybe Nothing (lookup "GIT_INDEX_FILE")
<$> fromRepo gitEnv
case M.lookup indexfile m of
Just h -> return h
Nothing -> do
h <- inRepo Git.CatFile.catFileStart
let m' = M.insert indexfile h m
Annex.changeState $ \s -> s { Annex.catfilehandles = m' }
return h
{- From the Sha or Ref of a symlink back to the key. -}
catKey :: Ref -> Annex (Maybe Key)
catKey ref = do
l <- fromInternalGitPath . encodeW8 . L.unpack <$> catObject ref
return $ if isLinkToAnnex l
then fileKey $ takeFileName l
else Nothing
{- From a file in git back to the key.
-
- Prefixing the file with ./ makes this work even if in a subdirectory
- of a repo.
-}
catKeyFile :: FilePath -> Annex (Maybe Key)
catKeyFile f = catKey $ Ref $ ":./" ++ f
|
