81 lines
2.3 KiB
Haskell
81 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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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 Data.Set as S
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type MissingObjects = S.Set Sha
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data FsckResults = FsckFoundMissing MissingObjects | FsckFailed
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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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let (command, params) = ("git", fsckParams 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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(output, fsckok) <- processTranscript command' (toCommand params') Nothing
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let objs = findShas 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 FsckFailed
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else return $ FsckFoundMissing badobjs
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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.a
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-}
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findMissing :: [Sha] -> Repo -> IO MissingObjects
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findMissing objs r = S.fromList <$> filterM (not <$$> present) objs
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where
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present o = either (const False) (const True) <$> tryIO (dump o)
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dump o = runQuiet
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[ Param "show"
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, Param (show o)
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] r
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findShas :: String -> [Sha]
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findShas = 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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