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|
{- git fsck interface
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Git.Fsck (
findBroken,
findMissing
) where
import Common
import Git
import Git.Command
import Git.Sha
import Git.CatFile
import qualified Data.Set as S
{- Runs fsck to find some of the broken objects in the repository.
- May not find all broken objects, if fsck fails on bad data in some of
- the broken objects it does find. If the fsck fails generally without
- finding any broken objects, returns Nothing.
-
- Strategy: Rather than parsing fsck's current specific output,
- look for anything in its output (both stdout and stderr) that appears
- to be a git sha. Not all such shas are of broken objects, so ask git
- to try to cat the object, and see if it fails.
-}
findBroken :: Repo -> IO (Maybe (S.Set Sha))
findBroken r = do
(output, fsckok) <- processTranscript "git" (toCommand $ fsckParams r) Nothing
let objs = parseFsckOutput output
badobjs <- findMissing objs r
if S.null badobjs && not fsckok
then return Nothing
else return $ Just badobjs
{- Finds objects that are missing from the git repsitory, or are corrupt.
- Note that catting a corrupt object will cause cat-file to crash. -}
findMissing :: [Sha] -> Repo -> IO (S.Set Sha)
findMissing objs r = go objs [] =<< start
where
start = catFileStart' False r
go [] c h = do
catFileStop h
return $ S.fromList c
go (o:os) c h = do
v <- tryIO $ isNothing <$> catObjectDetails h o
case v of
Left _ -> do
void $ tryIO $ catFileStop h
go os (o:c) =<< start
Right True -> go os (o:c) h
Right False -> go os c h
parseFsckOutput :: String -> [Sha]
parseFsckOutput = catMaybes . map extractSha . concat . map words . lines
fsckParams :: Repo -> [CommandParam]
fsckParams = gitCommandLine
[ Param "fsck"
, Param "--no-dangling"
, Param "--no-reflogs"
]
|
