git-recover-repository 1/2 done
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parent
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16 changed files with 431 additions and 43 deletions
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@ -8,6 +8,7 @@
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module Git.CatFile (
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CatFileHandle,
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catFileStart,
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catFileStart',
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catFileStop,
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catFile,
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catTree,
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@ -18,8 +19,7 @@ module Git.CatFile (
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import System.IO
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Lazy as L
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import Data.Char
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import System.Process (std_out, std_err)
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import Data.Tuple.Utils
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import Numeric
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import System.Posix.Types
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@ -30,13 +30,15 @@ import Git.Command
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import Git.Types
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import Git.FilePath
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import qualified Utility.CoProcess as CoProcess
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import Utility.Hash
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data CatFileHandle = CatFileHandle CoProcess.CoProcessHandle Repo
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catFileStart :: Repo -> IO CatFileHandle
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catFileStart repo = do
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coprocess <- CoProcess.rawMode =<< gitCoProcessStart True
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catFileStart = catFileStart' True
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catFileStart' :: Bool -> Repo -> IO CatFileHandle
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catFileStart' restartable repo = do
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coprocess <- CoProcess.rawMode =<< gitCoProcessStart restartable
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[ Param "cat-file"
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, Param "--batch"
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] repo
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@ -53,11 +55,10 @@ catFile h branch file = catObject h $ Ref $
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{- Uses a running git cat-file read the content of an object.
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- Objects that do not exist will have "" returned. -}
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catObject :: CatFileHandle -> Ref -> IO L.ByteString
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catObject h object = maybe L.empty fst <$> catObjectDetails h object
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catObject h object = maybe L.empty fst3 <$> catObjectDetails h object
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{- Gets both the content of an object, and its Sha. -}
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catObjectDetails :: CatFileHandle -> Ref -> IO (Maybe (L.ByteString, Sha))
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catObjectDetails (CatFileHandle hdl repo) object = CoProcess.query hdl send receive
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catObjectDetails :: CatFileHandle -> Ref -> IO (Maybe (L.ByteString, Sha, ObjectType))
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catObjectDetails (CatFileHandle hdl _) object = CoProcess.query hdl send receive
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where
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query = show object
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send to = hPutStrLn to query
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@ -65,19 +66,18 @@ catObjectDetails (CatFileHandle hdl repo) object = CoProcess.query hdl send rece
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header <- hGetLine from
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case words header of
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[sha, objtype, size]
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| length sha == shaSize &&
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isJust (readObjectType objtype) ->
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case reads size of
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[(bytes, "")] -> readcontent bytes from sha
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| length sha == shaSize ->
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case (readObjectType objtype, reads size) of
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(Just t, [(bytes, "")]) -> readcontent t bytes from sha
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_ -> dne
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| otherwise -> dne
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_
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| header == show object ++ " missing" -> dne
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| otherwise -> error $ "unknown response from git cat-file " ++ show (header, object)
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readcontent bytes from sha = do
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readcontent objtype bytes from sha = do
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content <- S.hGet from bytes
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eatchar '\n' from
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return $ Just (L.fromChunks [content], Ref sha)
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return $ Just (L.fromChunks [content], Ref sha, objtype)
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dne = return Nothing
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eatchar expected from = do
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c <- hGetChar from
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@ -88,8 +88,8 @@ catObjectDetails (CatFileHandle hdl repo) object = CoProcess.query hdl send rece
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catTree :: CatFileHandle -> Ref -> IO [(FilePath, FileMode)]
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catTree h treeref = go <$> catObjectDetails h treeref
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where
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go Nothing = []
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go (Just (b, _)) = parsetree [] b
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go (Just (b, _, TreeObject)) = parsetree [] b
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go _ = []
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parsetree c b = case L.break (== 0) b of
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(modefile, rest)
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