558 lines
18 KiB
Haskell
558 lines
18 KiB
Haskell
{- git repository recovery
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import qualified Data.Set as S
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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.Repair (
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runRepair,
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runRepairOf,
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successfulRepair,
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cleanCorruptObjects,
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retrieveMissingObjects,
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resetLocalBranches,
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removeTrackingBranches,
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checkIndex,
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checkIndexFast,
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missingIndex,
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emptyGoodCommits,
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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.Objects
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import Git.Sha
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import Git.Types
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import Git.Fsck
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import Git.Index
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import qualified Git.Config as Config
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import qualified Git.Construct as Construct
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import qualified Git.LsTree as LsTree
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import qualified Git.LsFiles as LsFiles
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import qualified Git.Ref as Ref
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import qualified Git.RefLog as RefLog
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import qualified Git.UpdateIndex as UpdateIndex
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import qualified Git.Branch as Branch
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import Utility.Tmp
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import Utility.Rsync
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import Utility.FileMode
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import qualified Data.Set as S
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import qualified Data.ByteString.Lazy as L
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import Data.Tuple.Utils
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{- Given a set of bad objects found by git fsck, which may not
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- be complete, finds and removes all corrupt objects,
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- and returns missing objects.
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-}
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cleanCorruptObjects :: FsckResults -> Repo -> IO FsckResults
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cleanCorruptObjects fsckresults r = do
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void $ explodePacks r
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objs <- listLooseObjectShas r
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mapM_ (tryIO . allowRead . looseObjectFile r) objs
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bad <- findMissing objs r
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void $ removeLoose r $ S.union bad (knownMissing fsckresults)
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-- Rather than returning the loose objects that were removed, re-run
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-- fsck. Other missing objects may have been in the packs,
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-- and this way fsck will find them.
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findBroken False r
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removeLoose :: Repo -> MissingObjects -> IO Bool
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removeLoose r s = do
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fs <- filterM doesFileExist (map (looseObjectFile r) (S.toList s))
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let count = length fs
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if count > 0
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then do
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putStrLn $ unwords
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[ "Removing"
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, show count
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, "corrupt loose objects."
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]
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mapM_ nukeFile fs
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return True
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else return False
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explodePacks :: Repo -> IO Bool
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explodePacks r = do
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packs <- listPackFiles r
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if null packs
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then return False
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else do
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putStrLn "Unpacking all pack files."
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mapM_ go packs
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return True
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where
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go packfile = withTmpFileIn (localGitDir r) "pack" $ \tmp _ -> do
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moveFile packfile tmp
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nukeFile $ packIdxFile packfile
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allowRead tmp
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-- May fail, if pack file is corrupt.
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void $ tryIO $
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pipeWrite [Param "unpack-objects", Param "-r"] r $ \h ->
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L.hPut h =<< L.readFile tmp
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{- Try to retrieve a set of missing objects, from the remotes of a
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- repository. Returns any that could not be retreived.
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-
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- If another clone of the repository exists locally, which might not be a
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- remote of the repo being repaired, its path can be passed as a reference
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- repository.
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-}
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retrieveMissingObjects :: FsckResults -> Maybe FilePath -> Repo -> IO FsckResults
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retrieveMissingObjects missing referencerepo r
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| not (foundBroken missing) = return missing
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| otherwise = withTmpDir "tmprepo" $ \tmpdir -> do
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unlessM (boolSystem "git" [Params "init", File tmpdir]) $
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error $ "failed to create temp repository in " ++ tmpdir
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tmpr <- Config.read =<< Construct.fromAbsPath tmpdir
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stillmissing <- pullremotes tmpr (remotes r) fetchrefstags missing
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if S.null (knownMissing stillmissing)
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then return stillmissing
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else pullremotes tmpr (remotes r) fetchallrefs stillmissing
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where
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pullremotes tmpr [] fetchrefs stillmissing = case referencerepo of
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Nothing -> return stillmissing
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Just p -> ifM (fetchfrom p fetchrefs tmpr)
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( do
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void $ explodePacks tmpr
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void $ copyObjects tmpr r
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case stillmissing of
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FsckFailed -> return $ FsckFailed
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FsckFoundMissing s -> FsckFoundMissing <$> findMissing (S.toList s) r
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, return stillmissing
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)
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pullremotes tmpr (rmt:rmts) fetchrefs ms
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| not (foundBroken ms) = return ms
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| otherwise = do
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putStrLn $ "Trying to recover missing objects from remote " ++ repoDescribe rmt ++ "."
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ifM (fetchfrom (repoLocation rmt) fetchrefs tmpr)
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( do
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void $ explodePacks tmpr
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void $ copyObjects tmpr r
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case ms of
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FsckFailed -> pullremotes tmpr rmts fetchrefs ms
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FsckFoundMissing s -> do
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stillmissing <- findMissing (S.toList s) r
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pullremotes tmpr rmts fetchrefs (FsckFoundMissing stillmissing)
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, pullremotes tmpr rmts fetchrefs ms
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)
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fetchfrom fetchurl ps = runBool $
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[ Param "fetch"
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, Param fetchurl
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, Params "--force --update-head-ok --quiet"
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] ++ ps
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-- fetch refs and tags
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fetchrefstags = [ Param "+refs/heads/*:refs/heads/*", Param "--tags"]
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-- Fetch all available refs (more likely to fail,
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-- as the remote may have refs it refuses to send).
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fetchallrefs = [ Param "+*:*" ]
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{- Copies all objects from the src repository to the dest repository.
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- This is done using rsync, so it copies all missing objects, and all
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- objects they rely on. -}
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copyObjects :: Repo -> Repo -> IO Bool
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copyObjects srcr destr = rsync
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[ Param "-qr"
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, File $ addTrailingPathSeparator $ objectsDir srcr
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, File $ addTrailingPathSeparator $ objectsDir destr
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]
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{- To deal with missing objects that cannot be recovered, resets any
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- local branches to point to an old commit before the missing
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- objects. Returns all branches that were changed, and deleted.
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-}
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resetLocalBranches :: MissingObjects -> GoodCommits -> Repo -> IO ([Branch], [Branch], GoodCommits)
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resetLocalBranches missing goodcommits r =
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go [] [] goodcommits =<< filter islocalbranch <$> getAllRefs r
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where
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islocalbranch b = "refs/heads/" `isPrefixOf` show b
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go changed deleted gcs [] = return (changed, deleted, gcs)
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go changed deleted gcs (b:bs) = do
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(mc, gcs') <- findUncorruptedCommit missing gcs b r
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case mc of
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Just c
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| c == b -> go changed deleted gcs' bs
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| otherwise -> do
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reset b c
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go (b:changed) deleted gcs' bs
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Nothing -> do
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nukeBranchRef b r
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go changed (b:deleted) gcs' bs
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reset b c = do
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nukeBranchRef b r
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void $ runBool
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[ Param "branch"
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, Param (show $ Ref.base b)
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, Param (show c)
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] r
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{- To deal with missing objects that cannot be recovered, removes
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- any remote tracking branches that reference them. Returns a list of
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- all removed branches.
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-}
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removeTrackingBranches :: MissingObjects -> GoodCommits -> Repo -> IO ([Branch], GoodCommits)
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removeTrackingBranches missing goodcommits r =
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go [] goodcommits =<< filter istrackingbranch <$> getAllRefs r
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where
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istrackingbranch b = "refs/remotes/" `isPrefixOf` show b
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go removed gcs [] = return (removed, gcs)
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go removed gcs (b:bs) = do
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(ok, gcs') <- verifyCommit missing gcs b r
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if ok
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then go removed gcs' bs
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else do
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nukeBranchRef b r
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go (b:removed) gcs' bs
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{- Gets all refs, including ones that are corrupt.
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- git show-ref does not output refs to commits that are directly
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- corrupted, so it is not used.
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-
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- Relies on packed refs being exploded before it's called.
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-}
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getAllRefs :: Repo -> IO [Ref]
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getAllRefs r = map toref <$> dirContentsRecursive refdir
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where
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refdir = localGitDir r </> "refs"
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toref = Ref . relPathDirToFile (localGitDir r)
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explodePackedRefsFile :: Repo -> IO ()
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explodePackedRefsFile r = do
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let f = packedRefsFile r
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whenM (doesFileExist f) $ do
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rs <- mapMaybe parsePacked . lines
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<$> catchDefaultIO "" (safeReadFile f)
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forM_ rs makeref
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nukeFile f
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where
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makeref (sha, ref) = do
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let dest = localGitDir r ++ show ref
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createDirectoryIfMissing True (parentDir dest)
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unlessM (doesFileExist dest) $
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writeFile dest (show sha)
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packedRefsFile :: Repo -> FilePath
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packedRefsFile r = localGitDir r </> "packed-refs"
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parsePacked :: String -> Maybe (Sha, Ref)
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parsePacked l = case words l of
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(sha:ref:[])
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| isJust (extractSha sha) && Ref.legal True ref ->
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Just (Ref sha, Ref ref)
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_ -> Nothing
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{- git-branch -d cannot be used to remove a branch that is directly
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- pointing to a corrupt commit. -}
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nukeBranchRef :: Branch -> Repo -> IO ()
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nukeBranchRef b r = nukeFile $ localGitDir r </> show b
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{- Finds the most recent commit to a branch that does not need any
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- of the missing objects. If the input branch is good as-is, returns it.
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- Otherwise, tries to traverse the commits in the branch to find one
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- that is ok. That might fail, if one of them is corrupt, or if an object
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- at the root of the branch is missing. Finally, looks for an old version
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- of the branch from the reflog.
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-}
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findUncorruptedCommit :: MissingObjects -> GoodCommits -> Branch -> Repo -> IO (Maybe Sha, GoodCommits)
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findUncorruptedCommit missing goodcommits branch r = do
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(ok, goodcommits') <- verifyCommit missing goodcommits branch r
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if ok
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then return (Just branch, goodcommits')
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else do
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(ls, cleanup) <- pipeNullSplit
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[ Param "log"
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, Param "-z"
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, Param "--format=%H"
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, Param (show branch)
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] r
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let branchshas = catMaybes $ map extractSha ls
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reflogshas <- RefLog.get branch r
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-- XXX Could try a bit harder here, and look
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-- for uncorrupted old commits in branches in the
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-- reflog.
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cleanup `after` findfirst goodcommits (branchshas ++ reflogshas)
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where
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findfirst gcs [] = return (Nothing, gcs)
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findfirst gcs (c:cs) = do
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(ok, gcs') <- verifyCommit missing gcs c r
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if ok
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then return (Just c, gcs')
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else findfirst gcs' cs
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{- Verifies tha none of the missing objects in the set are used by
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- the commit. Also adds to a set of commit shas that have been verified to
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- be good, which can be passed into subsequent calls to avoid
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- redundant work when eg, chasing down branches to find the first
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- uncorrupted commit. -}
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verifyCommit :: MissingObjects -> GoodCommits -> Sha -> Repo -> IO (Bool, GoodCommits)
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verifyCommit missing goodcommits commit r
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| checkGoodCommit commit goodcommits = return (True, goodcommits)
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| otherwise = do
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(ls, cleanup) <- pipeNullSplit
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[ Param "log"
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, Param "-z"
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, Param "--format=%H %T"
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, Param (show commit)
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] r
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let committrees = map parse ls
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if any isNothing committrees || null committrees
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then do
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void cleanup
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return (False, goodcommits)
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else do
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let cts = catMaybes committrees
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ifM (cleanup <&&> check cts)
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( return (True, addGoodCommits (map fst cts) goodcommits)
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, return (False, goodcommits)
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)
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where
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parse l = case words l of
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(commitsha:treesha:[]) -> (,)
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<$> extractSha commitsha
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<*> extractSha treesha
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_ -> Nothing
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check [] = return True
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check ((c, t):rest)
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| checkGoodCommit c goodcommits = return True
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| otherwise = verifyTree missing t r <&&> check rest
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{- Verifies that a tree is good, including all trees and blobs
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- referenced by it. -}
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verifyTree :: MissingObjects -> Sha -> Repo -> IO Bool
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verifyTree missing treesha r
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| S.member treesha missing = return False
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| otherwise = do
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(ls, cleanup) <- pipeNullSplit (LsTree.lsTreeParams treesha) r
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let objshas = map (extractSha . LsTree.sha . LsTree.parseLsTree) ls
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if any isNothing objshas || any (`S.member` missing) (catMaybes objshas)
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then do
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void cleanup
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return False
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-- as long as ls-tree succeeded, we're good
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else cleanup
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{- Checks that the index file only refers to objects that are not missing,
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- and is not itself corrupt. Note that a missing index file is not
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- considered a problem (repo may be new). -}
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checkIndex :: Repo -> IO Bool
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checkIndex r = do
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(bad, _good, cleanup) <- partitionIndex r
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if null bad
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then cleanup
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else do
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void cleanup
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return False
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{- Does not check every object the index refers to, but only that the index
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- itself is not corrupt. -}
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checkIndexFast :: Repo -> IO Bool
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checkIndexFast r = do
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(indexcontents, cleanup) <- LsFiles.stagedDetails [repoPath r] r
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length indexcontents `seq` cleanup
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missingIndex :: Repo -> IO Bool
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missingIndex r = not <$> doesFileExist (localGitDir r </> "index")
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{- Finds missing and ok files staged in the index. -}
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partitionIndex :: Repo -> IO ([LsFiles.StagedDetails], [LsFiles.StagedDetails], IO Bool)
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partitionIndex r = do
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(indexcontents, cleanup) <- LsFiles.stagedDetails [repoPath r] r
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l <- forM indexcontents $ \i -> case i of
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(_file, Just sha, Just _mode) -> (,) <$> isMissing sha r <*> pure i
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_ -> pure (False, i)
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let (bad, good) = partition fst l
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return (map snd bad, map snd good, cleanup)
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{- Rewrites the index file, removing from it any files whose blobs are
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- missing. Returns the list of affected files. -}
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rewriteIndex :: Repo -> IO [FilePath]
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rewriteIndex r
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| repoIsLocalBare r = return []
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| otherwise = do
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(bad, good, cleanup) <- partitionIndex r
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unless (null bad) $ do
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nukeFile (indexFile r)
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UpdateIndex.streamUpdateIndex r
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=<< (catMaybes <$> mapM reinject good)
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void cleanup
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return $ map fst3 bad
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where
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reinject (file, Just sha, Just mode) = case toBlobType mode of
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Nothing -> return Nothing
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Just blobtype -> Just <$>
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UpdateIndex.stageFile sha blobtype file r
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reinject _ = return Nothing
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newtype GoodCommits = GoodCommits (S.Set Sha)
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emptyGoodCommits :: GoodCommits
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emptyGoodCommits = GoodCommits S.empty
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checkGoodCommit :: Sha -> GoodCommits -> Bool
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checkGoodCommit sha (GoodCommits s) = S.member sha s
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addGoodCommits :: [Sha] -> GoodCommits -> GoodCommits
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addGoodCommits shas (GoodCommits s) = GoodCommits $
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S.union s (S.fromList shas)
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displayList :: [String] -> String -> IO ()
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displayList items header
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| null items = return ()
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| otherwise = do
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putStrLn header
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putStr $ unlines $ map (\i -> "\t" ++ i) truncateditems
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where
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numitems = length items
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truncateditems
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| numitems > 10 = take 10 items ++ ["(and " ++ show (numitems - 10) ++ " more)"]
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| otherwise = items
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{- Fix problems that would prevent repair from working at all
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-
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- A missing or corrupt .git/HEAD makes git not treat the repository as a
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- git repo. If there is a git repo in a parent directory, it may move up
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- the tree and use that one instead. So, cannot use `git show-ref HEAD` to
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- test it.
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-
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- Explode the packed refs file, to simplify dealing with refs, and because
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- fsck can complain about bad refs in it.
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-}
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preRepair :: Repo -> IO ()
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preRepair g = do
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unlessM (validhead <$> catchDefaultIO "" (safeReadFile headfile)) $ do
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nukeFile headfile
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writeFile headfile "ref: refs/heads/master"
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explodePackedRefsFile g
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unless (repoIsLocalBare g) $ do
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let f = indexFile g
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void $ tryIO $ allowWrite f
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where
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headfile = localGitDir g </> "HEAD"
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validhead s = "ref: refs/" `isPrefixOf` s || isJust (extractSha s)
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{- Put it all together. -}
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runRepair :: Bool -> Repo -> IO (Bool, [Branch])
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runRepair forced g = do
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preRepair g
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putStrLn "Running git fsck ..."
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fsckresult <- findBroken False g
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if foundBroken fsckresult
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then runRepair' fsckresult forced Nothing g
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else do
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putStrLn "No problems found."
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return (True, [])
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runRepairOf :: FsckResults -> Bool -> Maybe FilePath -> Repo -> IO (Bool, [Branch])
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runRepairOf fsckresult forced referencerepo g = do
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preRepair g
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runRepair' fsckresult forced referencerepo g
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runRepair' :: FsckResults -> Bool -> Maybe FilePath -> Repo -> IO (Bool, [Branch])
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runRepair' fsckresult forced referencerepo g = do
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missing <- cleanCorruptObjects fsckresult g
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stillmissing <- retrieveMissingObjects missing referencerepo g
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case stillmissing of
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FsckFoundMissing s
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| S.null s -> if repoIsLocalBare g
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then successfulfinish []
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else ifM (checkIndex g)
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( successfulfinish []
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, do
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putStrLn "No missing objects found, but the index file is corrupt!"
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if forced
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then corruptedindex
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else needforce
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)
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| otherwise -> if forced
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then ifM (checkIndex g)
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( continuerepairs s
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, corruptedindex
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)
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else do
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putStrLn $ unwords
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[ show (S.size s)
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, "missing objects could not be recovered!"
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]
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unsuccessfulfinish
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FsckFailed
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| forced -> ifM (pure (repoIsLocalBare g) <||> checkIndex g)
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( do
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missing' <- cleanCorruptObjects FsckFailed g
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case missing' of
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FsckFailed -> return (False, [])
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FsckFoundMissing stillmissing' ->
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continuerepairs stillmissing'
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, corruptedindex
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)
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| otherwise -> unsuccessfulfinish
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where
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continuerepairs stillmissing = do
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(remotebranches, goodcommits) <- removeTrackingBranches stillmissing emptyGoodCommits g
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unless (null remotebranches) $
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putStrLn $ unwords
|
|
[ "Removed"
|
|
, show (length remotebranches)
|
|
, "remote tracking branches that referred to missing objects."
|
|
]
|
|
(resetbranches, deletedbranches, _) <- resetLocalBranches stillmissing goodcommits g
|
|
displayList (map show resetbranches)
|
|
"Reset these local branches to old versions before the missing objects were committed:"
|
|
displayList (map show deletedbranches)
|
|
"Deleted these local branches, which could not be recovered due to missing objects:"
|
|
deindexedfiles <- rewriteIndex g
|
|
displayList deindexedfiles
|
|
"Removed these missing files from the index. You should look at what files are present in your working tree and git add them back to the index when appropriate."
|
|
let modifiedbranches = resetbranches ++ deletedbranches
|
|
if null resetbranches && null deletedbranches
|
|
then successfulfinish modifiedbranches
|
|
else do
|
|
unless (repoIsLocalBare g) $ do
|
|
mcurr <- Branch.currentUnsafe g
|
|
case mcurr of
|
|
Nothing -> return ()
|
|
Just curr -> when (any (== curr) modifiedbranches) $ do
|
|
putStrLn $ unwords
|
|
[ "You currently have"
|
|
, show curr
|
|
, "checked out. You may have staged changes in the index that can be committed to recover the lost state of this branch!"
|
|
]
|
|
putStrLn "Successfully recovered repository!"
|
|
putStrLn "Please carefully check that the changes mentioned above are ok.."
|
|
return (True, modifiedbranches)
|
|
|
|
corruptedindex = do
|
|
nukeFile (indexFile g)
|
|
-- The corrupted index can prevent fsck from finding other
|
|
-- problems, so re-run repair.
|
|
fsckresult' <- findBroken False g
|
|
result <- runRepairOf fsckresult' forced referencerepo g
|
|
putStrLn "Removed the corrupted index file. You should look at what files are present in your working tree and git add them back to the index when appropriate."
|
|
return result
|
|
|
|
successfulfinish modifiedbranches = do
|
|
mapM_ putStrLn
|
|
[ "Successfully recovered repository!"
|
|
, "You should run \"git fsck\" to make sure, but it looks like everything was recovered ok."
|
|
]
|
|
return (True, modifiedbranches)
|
|
unsuccessfulfinish = do
|
|
if repoIsLocalBare g
|
|
then do
|
|
putStrLn "If you have a clone of this bare repository, you should add it as a remote of this repository, and retry."
|
|
putStrLn "If there are no clones of this repository, you can instead retry with the --force parameter to force recovery to a possibly usable state."
|
|
return (False, [])
|
|
else needforce
|
|
needforce = do
|
|
putStrLn "To force a recovery to a usable state, retry with the --force parameter."
|
|
return (False, [])
|
|
|
|
successfulRepair :: (Bool, [Branch]) -> Bool
|
|
successfulRepair = fst
|
|
|
|
safeReadFile :: FilePath -> IO String
|
|
safeReadFile f = do
|
|
allowRead f
|
|
readFileStrictAnyEncoding f
|