117 lines
3.3 KiB
Haskell
117 lines
3.3 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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isMissing,
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knownMissing,
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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 Utility.Batch
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import qualified Git.Version
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import qualified Data.Set as S
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import Control.Concurrent.Async
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type MissingObjects = S.Set Sha
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data FsckResults
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= FsckFoundMissing
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{ missingObjects :: MissingObjects
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, missingObjectsTruncated :: Bool
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}
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| FsckFailed
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deriving (Show)
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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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supportsNoDangling <- (>= Git.Version.normalize "1.7.10")
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<$> Git.Version.installed
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let (command, params) = ("git", fsckParams supportsNoDangling r)
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(command', params') <- if batchmode
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then toBatchCommand (command, params)
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else return (command, params)
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p@(_, _, _, pid) <- createProcess $
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(proc command' (toCommand params'))
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{ std_out = CreatePipe
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, std_err = CreatePipe
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}
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(bad1, bad2) <- concurrently
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(readMissingObjs maxobjs r supportsNoDangling (stdoutHandle p))
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(readMissingObjs maxobjs r supportsNoDangling (stderrHandle p))
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fsckok <- checkSuccessProcess pid
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let truncated = S.size bad1 == maxobjs || S.size bad1 == maxobjs
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let badobjs = S.union bad1 bad2
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if S.null badobjs && not fsckok
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then return FsckFailed
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else return $ FsckFoundMissing badobjs truncated
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where
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maxobjs = 10000
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foundBroken :: FsckResults -> Bool
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foundBroken FsckFailed = True
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foundBroken (FsckFoundMissing s _) = not (S.null s)
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knownMissing :: FsckResults -> MissingObjects
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knownMissing FsckFailed = S.empty
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knownMissing (FsckFoundMissing s _) = 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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- This does not use git cat-file --batch, because catting a corrupt
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- object can cause it to crash, or to report incorrect size information.
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-}
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findMissing :: [Sha] -> Repo -> IO MissingObjects
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findMissing objs r = S.fromList <$> filterM (`isMissing` r) objs
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readMissingObjs :: Int -> Repo -> Bool -> Handle -> IO MissingObjects
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readMissingObjs maxobjs r supportsNoDangling h = do
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objs <- take maxobjs . findShas supportsNoDangling <$> hGetContents h
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findMissing objs r
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isMissing :: Sha -> Repo -> IO Bool
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isMissing s r = either (const True) (const False) <$> tryIO dump
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where
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dump = runQuiet
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[ Param "show"
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, Param (fromRef s)
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] r
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findShas :: Bool -> String -> [Sha]
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findShas supportsNoDangling = catMaybes . map extractSha . concat . map words . filter wanted . lines
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where
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wanted l
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| supportsNoDangling = True
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| otherwise = not ("dangling " `isPrefixOf` l)
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fsckParams :: Bool -> Repo -> [CommandParam]
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fsckParams supportsNoDangling = gitCommandLine $ map Param $ catMaybes
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[ Just "fsck"
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, if supportsNoDangling
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then Just "--no-dangling"
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else Nothing
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, Just "--no-reflogs"
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]
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