87 lines
2.3 KiB
Haskell
87 lines
2.3 KiB
Haskell
{- git fsck interface
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-
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- Copyright 2013 Joey Hess <joey@kitenet.net>
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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 Git.Fsck (
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FsckResults,
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MissingObjects,
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findBroken,
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foundBroken,
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findMissing,
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) where
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import Common
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import Git
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import Git.Command
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import Git.Sha
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import Git.CatFile
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import Utility.Batch
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import qualified Data.Set as S
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type MissingObjects = S.Set Sha
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{- If fsck succeeded, Just a set of missing objects it found.
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- If it failed, Nothing. -}
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type FsckResults = Maybe MissingObjects
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{- Runs fsck to find some of the broken objects in the repository.
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- May not find all broken objects, if fsck fails on bad data in some of
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- the broken objects it does find.
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-
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- Strategy: Rather than parsing fsck's current specific output,
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- look for anything in its output (both stdout and stderr) that appears
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- to be a git sha. Not all such shas are of broken objects, so ask git
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- to try to cat the object, and see if it fails.
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-}
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findBroken :: Bool -> Repo -> IO FsckResults
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findBroken batchmode r = do
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(output, fsckok) <- processTranscript command' (toCommand params') Nothing
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let objs = parseFsckOutput output
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badobjs <- findMissing objs r
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if S.null badobjs && not fsckok
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then return Nothing
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else return $ Just badobjs
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where
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(command, params) = ("git", fsckParams r)
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(command', params')
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| batchmode = toBatchCommand (command, params)
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| otherwise = (command, params)
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foundBroken :: FsckResults -> Bool
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foundBroken Nothing = True
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foundBroken (Just s) = not (S.null s)
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{- Finds objects that are missing from the git repsitory, or are corrupt.
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-
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- Note that catting a corrupt object will cause cat-file to crash;
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- this is detected and it's restarted.
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-}
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findMissing :: [Sha] -> Repo -> IO MissingObjects
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findMissing objs r = go objs [] =<< start
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where
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start = catFileStart' False r
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go [] c h = do
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catFileStop h
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return $ S.fromList c
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go (o:os) c h = do
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v <- tryIO $ isNothing <$> catObjectDetails h o
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case v of
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Left _ -> do
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void $ tryIO $ catFileStop h
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go os (o:c) =<< start
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Right True -> go os (o:c) h
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Right False -> go os c h
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parseFsckOutput :: String -> [Sha]
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parseFsckOutput = catMaybes . map extractSha . concat . map words . lines
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fsckParams :: Repo -> [CommandParam]
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fsckParams = gitCommandLine
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[ Param "fsck"
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, Param "--no-dangling"
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, Param "--no-reflogs"
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]
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