7b50b3c057
This fixes all instances of " \t" in the code base. Most common case seems to be after a "where" line; probably vim copied the two space layout of that line. Done as a background task while listening to episode 2 of the Type Theory podcast.
607 lines
20 KiB
Haskell
607 lines
20 KiB
Haskell
{- git repository recovery
|
|
-
|
|
- Copyright 2013-2014 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Git.Repair (
|
|
runRepair,
|
|
runRepairOf,
|
|
removeBadBranches,
|
|
successfulRepair,
|
|
cleanCorruptObjects,
|
|
retrieveMissingObjects,
|
|
resetLocalBranches,
|
|
checkIndex,
|
|
checkIndexFast,
|
|
missingIndex,
|
|
emptyGoodCommits,
|
|
isTrackingBranch,
|
|
) where
|
|
|
|
import Common
|
|
import Git
|
|
import Git.Command
|
|
import Git.Objects
|
|
import Git.Sha
|
|
import Git.Types
|
|
import Git.Fsck
|
|
import Git.Index
|
|
import qualified Git.Config as Config
|
|
import qualified Git.Construct as Construct
|
|
import qualified Git.LsTree as LsTree
|
|
import qualified Git.LsFiles as LsFiles
|
|
import qualified Git.Ref as Ref
|
|
import qualified Git.RefLog as RefLog
|
|
import qualified Git.UpdateIndex as UpdateIndex
|
|
import qualified Git.Branch as Branch
|
|
import Utility.Tmp
|
|
import Utility.Rsync
|
|
import Utility.FileMode
|
|
|
|
import qualified Data.Set as S
|
|
import qualified Data.ByteString.Lazy as L
|
|
import Data.Tuple.Utils
|
|
|
|
{- Given a set of bad objects found by git fsck, which may not
|
|
- be complete, finds and removes all corrupt objects. -}
|
|
cleanCorruptObjects :: FsckResults -> Repo -> IO ()
|
|
cleanCorruptObjects fsckresults r = do
|
|
void $ explodePacks r
|
|
mapM_ removeLoose (S.toList $ knownMissing fsckresults)
|
|
mapM_ removeBad =<< listLooseObjectShas r
|
|
where
|
|
removeLoose s = nukeFile (looseObjectFile r s)
|
|
removeBad s = do
|
|
void $ tryIO $ allowRead $ looseObjectFile r s
|
|
whenM (isMissing s r) $
|
|
removeLoose s
|
|
|
|
{- Explodes all pack files, and deletes them.
|
|
-
|
|
- First moves all pack files to a temp dir, before unpacking them each in
|
|
- turn.
|
|
-
|
|
- This is because unpack-objects will not unpack a pack file if it's in the
|
|
- git repo.
|
|
-
|
|
- Also, this prevents unpack-objects from possibly looking at corrupt
|
|
- pack files to see if they contain an object, while unpacking a
|
|
- non-corrupt pack file.
|
|
-}
|
|
explodePacks :: Repo -> IO Bool
|
|
explodePacks r = go =<< listPackFiles r
|
|
where
|
|
go [] = return False
|
|
go packs = withTmpDir "packs" $ \tmpdir -> do
|
|
putStrLn "Unpacking all pack files."
|
|
forM_ packs $ \packfile -> do
|
|
moveFile packfile (tmpdir </> takeFileName packfile)
|
|
nukeFile $ packIdxFile packfile
|
|
forM_ packs $ \packfile -> do
|
|
let tmp = tmpdir </> takeFileName packfile
|
|
allowRead tmp
|
|
-- May fail, if pack file is corrupt.
|
|
void $ tryIO $
|
|
pipeWrite [Param "unpack-objects", Param "-r"] r $ \h ->
|
|
L.hPut h =<< L.readFile tmp
|
|
return True
|
|
|
|
{- Try to retrieve a set of missing objects, from the remotes of a
|
|
- repository. Returns any that could not be retreived.
|
|
-
|
|
- If another clone of the repository exists locally, which might not be a
|
|
- remote of the repo being repaired, its path can be passed as a reference
|
|
- repository.
|
|
-}
|
|
retrieveMissingObjects :: FsckResults -> Maybe FilePath -> Repo -> IO FsckResults
|
|
retrieveMissingObjects missing referencerepo r
|
|
| not (foundBroken missing) = return missing
|
|
| otherwise = withTmpDir "tmprepo" $ \tmpdir -> do
|
|
unlessM (boolSystem "git" [Params "init", File tmpdir]) $
|
|
error $ "failed to create temp repository in " ++ tmpdir
|
|
tmpr <- Config.read =<< Construct.fromAbsPath tmpdir
|
|
stillmissing <- pullremotes tmpr (remotes r) fetchrefstags missing
|
|
if S.null (knownMissing stillmissing)
|
|
then return stillmissing
|
|
else pullremotes tmpr (remotes r) fetchallrefs stillmissing
|
|
where
|
|
pullremotes tmpr [] fetchrefs stillmissing = case referencerepo of
|
|
Nothing -> return stillmissing
|
|
Just p -> ifM (fetchfrom p fetchrefs tmpr)
|
|
( do
|
|
void $ explodePacks tmpr
|
|
void $ copyObjects tmpr r
|
|
case stillmissing of
|
|
FsckFailed -> return $ FsckFailed
|
|
FsckFoundMissing s t -> FsckFoundMissing
|
|
<$> findMissing (S.toList s) r
|
|
<*> pure t
|
|
, return stillmissing
|
|
)
|
|
pullremotes tmpr (rmt:rmts) fetchrefs ms
|
|
| not (foundBroken ms) = return ms
|
|
| otherwise = do
|
|
putStrLn $ "Trying to recover missing objects from remote " ++ repoDescribe rmt ++ "."
|
|
ifM (fetchfrom (repoLocation rmt) fetchrefs tmpr)
|
|
( do
|
|
void $ explodePacks tmpr
|
|
void $ copyObjects tmpr r
|
|
case ms of
|
|
FsckFailed -> pullremotes tmpr rmts fetchrefs ms
|
|
FsckFoundMissing s t -> do
|
|
stillmissing <- findMissing (S.toList s) r
|
|
pullremotes tmpr rmts fetchrefs (FsckFoundMissing stillmissing t)
|
|
, pullremotes tmpr rmts fetchrefs ms
|
|
)
|
|
fetchfrom fetchurl ps = runBool $
|
|
[ Param "fetch"
|
|
, Param fetchurl
|
|
, Params "--force --update-head-ok --quiet"
|
|
] ++ ps
|
|
-- fetch refs and tags
|
|
fetchrefstags = [ Param "+refs/heads/*:refs/heads/*", Param "--tags"]
|
|
-- Fetch all available refs (more likely to fail,
|
|
-- as the remote may have refs it refuses to send).
|
|
fetchallrefs = [ Param "+*:*" ]
|
|
|
|
{- Copies all objects from the src repository to the dest repository.
|
|
- This is done using rsync, so it copies all missing objects, and all
|
|
- objects they rely on. -}
|
|
copyObjects :: Repo -> Repo -> IO Bool
|
|
copyObjects srcr destr = rsync
|
|
[ Param "-qr"
|
|
, File $ addTrailingPathSeparator $ objectsDir srcr
|
|
, File $ addTrailingPathSeparator $ objectsDir destr
|
|
]
|
|
|
|
{- To deal with missing objects that cannot be recovered, resets any
|
|
- local branches to point to an old commit before the missing
|
|
- objects. Returns all branches that were changed, and deleted.
|
|
-}
|
|
resetLocalBranches :: MissingObjects -> GoodCommits -> Repo -> IO ([Branch], [Branch], GoodCommits)
|
|
resetLocalBranches missing goodcommits r =
|
|
go [] [] goodcommits =<< filter islocalbranch <$> getAllRefs r
|
|
where
|
|
islocalbranch b = "refs/heads/" `isPrefixOf` fromRef b
|
|
go changed deleted gcs [] = return (changed, deleted, gcs)
|
|
go changed deleted gcs (b:bs) = do
|
|
(mc, gcs') <- findUncorruptedCommit missing gcs b r
|
|
case mc of
|
|
Just c
|
|
| c == b -> go changed deleted gcs' bs
|
|
| otherwise -> do
|
|
reset b c
|
|
go (b:changed) deleted gcs' bs
|
|
Nothing -> do
|
|
nukeBranchRef b r
|
|
go changed (b:deleted) gcs' bs
|
|
reset b c = do
|
|
nukeBranchRef b r
|
|
void $ runBool
|
|
[ Param "branch"
|
|
, Param (fromRef $ Ref.base b)
|
|
, Param (fromRef c)
|
|
] r
|
|
|
|
isTrackingBranch :: Ref -> Bool
|
|
isTrackingBranch b = "refs/remotes/" `isPrefixOf` fromRef b
|
|
|
|
{- To deal with missing objects that cannot be recovered, removes
|
|
- any branches (filtered by a predicate) that reference them
|
|
- Returns a list of all removed branches.
|
|
-}
|
|
removeBadBranches :: (Ref -> Bool) -> Repo -> IO [Branch]
|
|
removeBadBranches removablebranch r = fst <$> removeBadBranches' removablebranch S.empty emptyGoodCommits r
|
|
|
|
removeBadBranches' :: (Ref -> Bool) -> MissingObjects -> GoodCommits -> Repo -> IO ([Branch], GoodCommits)
|
|
removeBadBranches' removablebranch missing goodcommits r =
|
|
go [] goodcommits =<< filter removablebranch <$> getAllRefs r
|
|
where
|
|
go removed gcs [] = return (removed, gcs)
|
|
go removed gcs (b:bs) = do
|
|
(ok, gcs') <- verifyCommit missing gcs b r
|
|
if ok
|
|
then go removed gcs' bs
|
|
else do
|
|
nukeBranchRef b r
|
|
go (b:removed) gcs' bs
|
|
|
|
badBranches :: MissingObjects -> Repo -> IO [Branch]
|
|
badBranches missing r = filterM isbad =<< getAllRefs r
|
|
where
|
|
isbad b = not . fst <$> verifyCommit missing emptyGoodCommits b r
|
|
|
|
{- Gets all refs, including ones that are corrupt.
|
|
- git show-ref does not output refs to commits that are directly
|
|
- corrupted, so it is not used.
|
|
-
|
|
- Relies on packed refs being exploded before it's called.
|
|
-}
|
|
getAllRefs :: Repo -> IO [Ref]
|
|
getAllRefs r = map toref <$> dirContentsRecursive refdir
|
|
where
|
|
refdir = localGitDir r </> "refs"
|
|
toref = Ref . relPathDirToFile (localGitDir r)
|
|
|
|
explodePackedRefsFile :: Repo -> IO ()
|
|
explodePackedRefsFile r = do
|
|
let f = packedRefsFile r
|
|
whenM (doesFileExist f) $ do
|
|
rs <- mapMaybe parsePacked . lines
|
|
<$> catchDefaultIO "" (safeReadFile f)
|
|
forM_ rs makeref
|
|
nukeFile f
|
|
where
|
|
makeref (sha, ref) = do
|
|
let dest = localGitDir r </> fromRef ref
|
|
createDirectoryIfMissing True (parentDir dest)
|
|
unlessM (doesFileExist dest) $
|
|
writeFile dest (fromRef sha)
|
|
|
|
packedRefsFile :: Repo -> FilePath
|
|
packedRefsFile r = localGitDir r </> "packed-refs"
|
|
|
|
parsePacked :: String -> Maybe (Sha, Ref)
|
|
parsePacked l = case words l of
|
|
(sha:ref:[])
|
|
| isJust (extractSha sha) && Ref.legal True ref ->
|
|
Just (Ref sha, Ref ref)
|
|
_ -> Nothing
|
|
|
|
{- git-branch -d cannot be used to remove a branch that is directly
|
|
- pointing to a corrupt commit. -}
|
|
nukeBranchRef :: Branch -> Repo -> IO ()
|
|
nukeBranchRef b r = nukeFile $ localGitDir r </> fromRef b
|
|
|
|
{- Finds the most recent commit to a branch that does not need any
|
|
- of the missing objects. If the input branch is good as-is, returns it.
|
|
- Otherwise, tries to traverse the commits in the branch to find one
|
|
- that is ok. That might fail, if one of them is corrupt, or if an object
|
|
- at the root of the branch is missing. Finally, looks for an old version
|
|
- of the branch from the reflog.
|
|
-}
|
|
findUncorruptedCommit :: MissingObjects -> GoodCommits -> Branch -> Repo -> IO (Maybe Sha, GoodCommits)
|
|
findUncorruptedCommit missing goodcommits branch r = do
|
|
(ok, goodcommits') <- verifyCommit missing goodcommits branch r
|
|
if ok
|
|
then return (Just branch, goodcommits')
|
|
else do
|
|
(ls, cleanup) <- pipeNullSplit
|
|
[ Param "log"
|
|
, Param "-z"
|
|
, Param "--format=%H"
|
|
, Param (fromRef branch)
|
|
] r
|
|
let branchshas = catMaybes $ map extractSha ls
|
|
reflogshas <- RefLog.get branch r
|
|
-- XXX Could try a bit harder here, and look
|
|
-- for uncorrupted old commits in branches in the
|
|
-- reflog.
|
|
cleanup `after` findfirst goodcommits (branchshas ++ reflogshas)
|
|
where
|
|
findfirst gcs [] = return (Nothing, gcs)
|
|
findfirst gcs (c:cs) = do
|
|
(ok, gcs') <- verifyCommit missing gcs c r
|
|
if ok
|
|
then return (Just c, gcs')
|
|
else findfirst gcs' cs
|
|
|
|
{- Verifies that none of the missing objects in the set are used by
|
|
- the commit. Also adds to a set of commit shas that have been verified to
|
|
- be good, which can be passed into subsequent calls to avoid
|
|
- redundant work when eg, chasing down branches to find the first
|
|
- uncorrupted commit. -}
|
|
verifyCommit :: MissingObjects -> GoodCommits -> Sha -> Repo -> IO (Bool, GoodCommits)
|
|
verifyCommit missing goodcommits commit r
|
|
| checkGoodCommit commit goodcommits = return (True, goodcommits)
|
|
| otherwise = do
|
|
(ls, cleanup) <- pipeNullSplit
|
|
[ Param "log"
|
|
, Param "-z"
|
|
, Param "--format=%H %T"
|
|
, Param (fromRef commit)
|
|
] r
|
|
let committrees = map parse ls
|
|
if any isNothing committrees || null committrees
|
|
then do
|
|
void cleanup
|
|
return (False, goodcommits)
|
|
else do
|
|
let cts = catMaybes committrees
|
|
ifM (cleanup <&&> check cts)
|
|
( return (True, addGoodCommits (map fst cts) goodcommits)
|
|
, return (False, goodcommits)
|
|
)
|
|
where
|
|
parse l = case words l of
|
|
(commitsha:treesha:[]) -> (,)
|
|
<$> extractSha commitsha
|
|
<*> extractSha treesha
|
|
_ -> Nothing
|
|
check [] = return True
|
|
check ((c, t):rest)
|
|
| checkGoodCommit c goodcommits = return True
|
|
| otherwise = verifyTree missing t r <&&> check rest
|
|
|
|
{- Verifies that a tree is good, including all trees and blobs
|
|
- referenced by it. -}
|
|
verifyTree :: MissingObjects -> Sha -> Repo -> IO Bool
|
|
verifyTree missing treesha r
|
|
| S.member treesha missing = return False
|
|
| otherwise = do
|
|
(ls, cleanup) <- pipeNullSplit (LsTree.lsTreeParams treesha) r
|
|
let objshas = map (extractSha . LsTree.sha . LsTree.parseLsTree) ls
|
|
if any isNothing objshas || any (`S.member` missing) (catMaybes objshas)
|
|
then do
|
|
void cleanup
|
|
return False
|
|
-- as long as ls-tree succeeded, we're good
|
|
else cleanup
|
|
|
|
{- Checks that the index file only refers to objects that are not missing,
|
|
- and is not itself corrupt. Note that a missing index file is not
|
|
- considered a problem (repo may be new). -}
|
|
checkIndex :: Repo -> IO Bool
|
|
checkIndex r = do
|
|
(bad, _good, cleanup) <- partitionIndex r
|
|
if null bad
|
|
then cleanup
|
|
else do
|
|
void cleanup
|
|
return False
|
|
|
|
{- Does not check every object the index refers to, but only that the index
|
|
- itself is not corrupt. -}
|
|
checkIndexFast :: Repo -> IO Bool
|
|
checkIndexFast r = do
|
|
(indexcontents, cleanup) <- LsFiles.stagedDetails [repoPath r] r
|
|
length indexcontents `seq` cleanup
|
|
|
|
missingIndex :: Repo -> IO Bool
|
|
missingIndex r = not <$> doesFileExist (localGitDir r </> "index")
|
|
|
|
{- Finds missing and ok files staged in the index. -}
|
|
partitionIndex :: Repo -> IO ([LsFiles.StagedDetails], [LsFiles.StagedDetails], IO Bool)
|
|
partitionIndex r = do
|
|
(indexcontents, cleanup) <- LsFiles.stagedDetails [repoPath r] r
|
|
l <- forM indexcontents $ \i -> case i of
|
|
(_file, Just sha, Just _mode) -> (,) <$> isMissing sha r <*> pure i
|
|
_ -> pure (False, i)
|
|
let (bad, good) = partition fst l
|
|
return (map snd bad, map snd good, cleanup)
|
|
|
|
{- Rewrites the index file, removing from it any files whose blobs are
|
|
- missing. Returns the list of affected files. -}
|
|
rewriteIndex :: Repo -> IO [FilePath]
|
|
rewriteIndex r
|
|
| repoIsLocalBare r = return []
|
|
| otherwise = do
|
|
(bad, good, cleanup) <- partitionIndex r
|
|
unless (null bad) $ do
|
|
nukeFile (indexFile r)
|
|
UpdateIndex.streamUpdateIndex r
|
|
=<< (catMaybes <$> mapM reinject good)
|
|
void cleanup
|
|
return $ map fst3 bad
|
|
where
|
|
reinject (file, Just sha, Just mode) = case toBlobType mode of
|
|
Nothing -> return Nothing
|
|
Just blobtype -> Just <$>
|
|
UpdateIndex.stageFile sha blobtype file r
|
|
reinject _ = return Nothing
|
|
|
|
newtype GoodCommits = GoodCommits (S.Set Sha)
|
|
|
|
emptyGoodCommits :: GoodCommits
|
|
emptyGoodCommits = GoodCommits S.empty
|
|
|
|
checkGoodCommit :: Sha -> GoodCommits -> Bool
|
|
checkGoodCommit sha (GoodCommits s) = S.member sha s
|
|
|
|
addGoodCommits :: [Sha] -> GoodCommits -> GoodCommits
|
|
addGoodCommits shas (GoodCommits s) = GoodCommits $
|
|
S.union s (S.fromList shas)
|
|
|
|
displayList :: [String] -> String -> IO ()
|
|
displayList items header
|
|
| null items = return ()
|
|
| otherwise = do
|
|
putStrLn header
|
|
putStr $ unlines $ map (\i -> "\t" ++ i) truncateditems
|
|
where
|
|
numitems = length items
|
|
truncateditems
|
|
| numitems > 10 = take 10 items ++ ["(and " ++ show (numitems - 10) ++ " more)"]
|
|
| otherwise = items
|
|
|
|
{- Fix problems that would prevent repair from working at all
|
|
-
|
|
- A missing or corrupt .git/HEAD makes git not treat the repository as a
|
|
- git repo. If there is a git repo in a parent directory, it may move up
|
|
- the tree and use that one instead. So, cannot use `git show-ref HEAD` to
|
|
- test it.
|
|
-
|
|
- Explode the packed refs file, to simplify dealing with refs, and because
|
|
- fsck can complain about bad refs in it.
|
|
-}
|
|
preRepair :: Repo -> IO ()
|
|
preRepair g = do
|
|
unlessM (validhead <$> catchDefaultIO "" (safeReadFile headfile)) $ do
|
|
nukeFile headfile
|
|
writeFile headfile "ref: refs/heads/master"
|
|
explodePackedRefsFile g
|
|
unless (repoIsLocalBare g) $ do
|
|
let f = indexFile g
|
|
void $ tryIO $ allowWrite f
|
|
where
|
|
headfile = localGitDir g </> "HEAD"
|
|
validhead s = "ref: refs/" `isPrefixOf` s || isJust (extractSha s)
|
|
|
|
{- Put it all together. -}
|
|
runRepair :: (Ref -> Bool) -> Bool -> Repo -> IO (Bool, [Branch])
|
|
runRepair removablebranch forced g = do
|
|
preRepair g
|
|
putStrLn "Running git fsck ..."
|
|
fsckresult <- findBroken False g
|
|
if foundBroken fsckresult
|
|
then runRepair' removablebranch fsckresult forced Nothing g
|
|
else do
|
|
bad <- badBranches S.empty g
|
|
if null bad
|
|
then do
|
|
putStrLn "No problems found."
|
|
return (True, [])
|
|
else runRepair' removablebranch fsckresult forced Nothing g
|
|
|
|
runRepairOf :: FsckResults -> (Ref -> Bool) -> Bool -> Maybe FilePath -> Repo -> IO (Bool, [Branch])
|
|
runRepairOf fsckresult removablebranch forced referencerepo g = do
|
|
preRepair g
|
|
runRepair' removablebranch fsckresult forced referencerepo g
|
|
|
|
runRepair' :: (Ref -> Bool) -> FsckResults -> Bool -> Maybe FilePath -> Repo -> IO (Bool, [Branch])
|
|
runRepair' removablebranch fsckresult forced referencerepo g = do
|
|
cleanCorruptObjects fsckresult g
|
|
missing <- findBroken False g
|
|
stillmissing <- retrieveMissingObjects missing referencerepo g
|
|
case stillmissing of
|
|
FsckFoundMissing s t
|
|
| S.null s -> if repoIsLocalBare g
|
|
then checkbadbranches s
|
|
else ifM (checkIndex g)
|
|
( checkbadbranches s
|
|
, do
|
|
putStrLn "No missing objects found, but the index file is corrupt!"
|
|
if forced
|
|
then corruptedindex
|
|
else needforce
|
|
)
|
|
| otherwise -> if forced
|
|
then ifM (checkIndex g)
|
|
( forcerepair s t
|
|
, corruptedindex
|
|
)
|
|
else do
|
|
putStrLn $ unwords
|
|
[ show (S.size s)
|
|
, "missing objects could not be recovered!"
|
|
]
|
|
unsuccessfulfinish
|
|
FsckFailed
|
|
| forced -> ifM (pure (repoIsLocalBare g) <||> checkIndex g)
|
|
( do
|
|
cleanCorruptObjects FsckFailed g
|
|
stillmissing' <- findBroken False g
|
|
case stillmissing' of
|
|
FsckFailed -> return (False, [])
|
|
FsckFoundMissing s t -> forcerepair s t
|
|
, corruptedindex
|
|
)
|
|
| otherwise -> unsuccessfulfinish
|
|
where
|
|
repairbranches missing = do
|
|
(removedbranches, goodcommits) <- removeBadBranches' removablebranch missing emptyGoodCommits g
|
|
let remotebranches = filter isTrackingBranch removedbranches
|
|
unless (null remotebranches) $
|
|
putStrLn $ unwords
|
|
[ "Removed"
|
|
, show (length remotebranches)
|
|
, "remote tracking branches that referred to missing objects."
|
|
]
|
|
(resetbranches, deletedbranches, _) <- resetLocalBranches missing goodcommits g
|
|
displayList (map fromRef resetbranches)
|
|
"Reset these local branches to old versions before the missing objects were committed:"
|
|
displayList (map fromRef deletedbranches)
|
|
"Deleted these local branches, which could not be recovered due to missing objects:"
|
|
return (resetbranches ++ deletedbranches)
|
|
|
|
checkbadbranches missing = do
|
|
bad <- badBranches missing g
|
|
case (null bad, forced) of
|
|
(True, _) -> successfulfinish []
|
|
(False, False) -> do
|
|
displayList (map fromRef bad)
|
|
"Some git branches refer to missing objects:"
|
|
unsuccessfulfinish
|
|
(False, True) -> successfulfinish =<< repairbranches missing
|
|
|
|
forcerepair missing fscktruncated = do
|
|
modifiedbranches <- repairbranches missing
|
|
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."
|
|
|
|
-- When the fsck results were truncated, try
|
|
-- fscking again, and as long as different
|
|
-- missing objects are found, continue
|
|
-- the repair process.
|
|
if fscktruncated
|
|
then do
|
|
fsckresult' <- findBroken False g
|
|
case fsckresult' of
|
|
FsckFailed -> do
|
|
putStrLn "git fsck is failing"
|
|
return (False, modifiedbranches)
|
|
FsckFoundMissing s _
|
|
| S.null s -> successfulfinish modifiedbranches
|
|
| S.null (s `S.difference` missing) -> do
|
|
putStrLn $ unwords
|
|
[ show (S.size s)
|
|
, "missing objects could not be recovered!"
|
|
]
|
|
return (False, modifiedbranches)
|
|
| otherwise -> do
|
|
(ok, modifiedbranches') <- runRepairOf fsckresult' removablebranch forced referencerepo g
|
|
return (ok, modifiedbranches++modifiedbranches')
|
|
else successfulfinish 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' removablebranch 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
|
|
| null 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)
|
|
| otherwise = 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"
|
|
, fromRef 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)
|
|
|
|
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
|