{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE ViewPatterns #-}
{-# OPTIONS_GHC -fno-warn-name-shadowing
-fno-warn-unused-binds
-fno-warn-orphans #-}
-- | Interface for opening and creating repositories. Repository objects are
-- immutable, and serve only to refer to the given repository. Any data
-- associated with the repository — such as the list of branches — is
-- queried as needed.
module Git.Libgit2
( MonadLg
, LgRepository(..)
, BlobOid()
, Commit()
, CommitOid()
, Git.Oid
, OidPtr(..)
, mkOid
, Repository(..)
, Tree()
, TreeOid()
, repoPath
, addTracingBackend
, checkResult
, closeLgRepository
, defaultLgOptions
, lgBuildPackIndex
, lgFactory
, lgFactoryLogger
, lgForEachObject
, lgGet
, lgExcTrap
, lgBuildPackFile
, lgReadFromPack
, lgWithPackFile
, lgCopyPackFile
, lgDiffContentsWithTree
, lgWrap
, oidToSha
, shaToOid
, openLgRepository
, runLgRepository
, lgDebug
, lgWarn
) where
import Bindings.Libgit2
import Control.Applicative
import Control.Concurrent.Async.Lifted
import Control.Concurrent.STM
import Control.Exception.Lifted
import Control.Failure
import Control.Monad hiding (forM, forM_, mapM, mapM_, sequence)
import Control.Monad.IO.Class
import Control.Monad.Logger
import Control.Monad.Loops
import Control.Monad.Morph hiding (embed)
import Control.Monad.Trans.Control
import Control.Monad.Trans.Reader
import Control.Monad.Trans.Resource
import Data.Bits ((.|.), (.&.))
import Data.ByteString (ByteString)
import qualified Data.ByteString as B
import qualified Data.ByteString.Unsafe as BU
import Data.Conduit
import Data.Foldable
import Data.IORef
import Data.List as L
import qualified Data.Map as M
import Data.Maybe
import Data.Monoid
import Data.Tagged
import Data.Text (Text, pack, unpack)
import qualified Data.Text as T
import qualified Data.Text.Encoding as T
import qualified Data.Text.ICU.Convert as U
import Data.Traversable
import Foreign.C.String
import Foreign.C.Types
import qualified Foreign.Concurrent as FC
import Foreign.ForeignPtr
import qualified Foreign.ForeignPtr.Unsafe as FU
import Foreign.Marshal.Alloc
import Foreign.Marshal.Array
import Foreign.Marshal.MissingAlloc
import Foreign.Marshal.Utils
import Foreign.Ptr
import Foreign.Storable
import qualified Git
import Git.Libgit2.Internal
import Git.Libgit2.Types
import Language.Haskell.TH.Syntax (Loc(..))
import Prelude hiding (mapM, mapM_, sequence, catch)
import System.Directory
import System.FilePath.Posix
import System.IO (openBinaryTempFile, hClose)
import qualified System.IO.Unsafe as SU
import Unsafe.Coerce
defaultLoc :: Loc
defaultLoc = Loc "<unknown>" "<unknown>" "<unknown>" (0,0) (0,0)
lgDebug :: MonadLogger m => String -> m ()
lgDebug = monadLoggerLog defaultLoc "Git" LevelDebug . pack
lgWarn :: MonadLogger m => String -> m ()
lgWarn = monadLoggerLog defaultLoc "Git" LevelWarn . pack
withFilePath :: Git.RawFilePath -> (CString -> IO a) -> IO a
withFilePath = B.useAsCString
peekFilePath :: CString -> IO Git.RawFilePath
peekFilePath = B.packCString
type Oid = OidPtr
data OidPtr = OidPtr
{ getOid :: ForeignPtr C'git_oid
, getOidLen :: Int -- the number of digits, not bytes
}
instance Git.IsOid OidPtr where
renderOid = lgRenderOid
mkOid :: ForeignPtr C'git_oid -> OidPtr
mkOid fptr = OidPtr fptr 40
lgParseOidIO :: Text -> Int -> IO (Maybe Oid)
lgParseOidIO str len = do
oid <- liftIO mallocForeignPtr
r <- liftIO $ withCString (unpack str) $ \cstr ->
withForeignPtr oid $ \ptr ->
if len == 40
then c'git_oid_fromstr ptr cstr
else c'git_oid_fromstrn ptr cstr (fromIntegral len)
return $ if r < 0
then Nothing
else Just (OidPtr oid len)
lgParseOid :: MonadLg m => Text -> LgRepository m Oid
lgParseOid str
| len > 40 = failure (Git.OidParseFailed str)
| otherwise = do
moid <- liftIO $ lgParseOidIO str len
case moid of
Nothing -> failure (Git.OidParseFailed str)
Just oid -> return oid
where
len = T.length str
lgRenderOid :: Git.Oid (LgRepository m) -> Text
lgRenderOid = pack . show
instance Show OidPtr where
show OidPtr {..} = SU.unsafePerformIO $
withForeignPtr getOid (`oidToStr` getOidLen)
instance Ord OidPtr where
(getOid -> coid1) `compare` (getOid -> coid2) =
SU.unsafePerformIO $
withForeignPtr coid1 $ \coid1Ptr ->
withForeignPtr coid2 $ fmap (`compare` 0) . c'git_oid_cmp coid1Ptr
instance Eq OidPtr where
oid1 == oid2 = oid1 `compare` oid2 == EQ
instance MonadLg m => Git.Repository (LgRepository m) where
type Oid (LgRepository m) = OidPtr
data Tree (LgRepository m) = LgTree
{ lgTreePtr :: Maybe (ForeignPtr C'git_tree) }
data Options (LgRepository m) = Options
facts = return Git.RepositoryFacts
{ Git.hasSymbolicReferences = True }
parseOid = lgParseOid
lookupReference = lgLookupRef
createReference = lgUpdateRef
updateReference = lgUpdateRef
deleteReference = lgDeleteRef
listReferences = lgListRefs
lookupCommit = lgLookupCommit
lookupTree = lgLookupTree
lookupBlob = lgLookupBlob
lookupTag = error "Not implemented: LgRepository.lookupTag"
lookupObject = lgLookupObject
existsObject = lgExistsObject
sourceObjects = lgSourceObjects
newTreeBuilder = lgNewTreeBuilder
treeEntry = lgTreeEntry
treeOid = lgTreeOid
listTreeEntries = lgListTreeEntries
hashContents = lgHashContents
createBlob = lgWrap . lgCreateBlob
createTag = error "Not implemented: LgRepository.createTag"
createCommit p t a c l r = lgWrap $ lgCreateCommit p t a c l r
deleteRepository = lgGet >>= liftIO . removeDirectoryRecursive . repoPath
diffContentsWithTree = error "Not implemented: lgDiffContentsWithTree"
-- buildPackFile = lgBuildPackFile
-- buildPackIndex = lgBuildPackIndexWrapper
-- writePackFile = lgWrap . lgWritePackFile
-- remoteFetch = lgRemoteFetch
lgWrap :: (MonadIO m, MonadBaseControl IO m)
=> LgRepository m a -> LgRepository m a
lgWrap f = f `catch` \e -> do
etrap <- lgExcTrap
mexc <- liftIO $ readIORef etrap
liftIO $ writeIORef etrap Nothing
maybe (throw (e :: SomeException)) throw mexc
lgHashContents :: MonadLg m => Git.BlobContents (LgRepository m)
-> LgRepository m (BlobOid m)
lgHashContents b = do
ptr <- liftIO mallocForeignPtr
r <- Git.blobContentsToByteString b >>= \bs ->
liftIO $ withForeignPtr ptr $ \oidPtr ->
BU.unsafeUseAsCStringLen bs $ uncurry $ \cstr len ->
c'git_odb_hash oidPtr (castPtr cstr) (fromIntegral len)
c'GIT_OBJ_BLOB
when (r < 0) $ lgThrow Git.BlobCreateFailed
return $ Tagged (mkOid ptr)
-- | Create a new blob in the 'Repository', with 'ByteString' as its contents.
--
-- Note that since empty blobs cannot exist in Git, no means is provided for
-- creating one; if the given string is 'empty', it is an error.
lgCreateBlob :: MonadLg m
=> Git.BlobContents (LgRepository m)
-> LgRepository m (BlobOid m)
lgCreateBlob b = do
repo <- lgGet
ptr <- liftIO mallocForeignPtr -- freed automatically if GC'd
r <- case b of
Git.BlobString bs ->
liftIO $ withForeignPtr ptr $ \coid' ->
withForeignPtr (repoObj repo) $ \repoPtr ->
BU.unsafeUseAsCStringLen bs $ uncurry $ \cstr len ->
c'git_blob_create_frombuffer coid' repoPtr
(castPtr cstr) (fromIntegral len)
Git.BlobStream src -> readFromSource repo ptr src
Git.BlobSizedStream src _ -> readFromSource repo ptr src
when (r < 0) $ lgThrow Git.BlobCreateFailed
return $ Tagged (mkOid ptr)
where
readFromSource repo ptr src =
src $$ drainTo 2 $ \queue ->
liftIO $ withForeignPtr ptr $ \coid' ->
withForeignPtr (repoObj repo) $ \repoPtr ->
bracket
(mk'git_blob_chunk_cb (chunk_cb queue))
freeHaskellFunPtr
(\cb -> c'git_blob_create_fromchunks coid' repoPtr
nullPtr cb nullPtr)
chunk_cb :: TBQueue (Maybe ByteString)
-> CString -- ^ content
-> CSize -- ^ max_length
-> Ptr () -- ^ payload
-> IO CInt
chunk_cb queue content (fromIntegral -> maxLength) _payload = do
(bs, len) <- atomically $ do
mval <- readTBQueue queue
let len = case mval of Nothing -> 0; Just val -> B.length val
case mval of
Nothing -> return (B.empty, 0)
Just val
| len <= maxLength -> return (val, len)
| otherwise -> do
let (b, b') = B.splitAt maxLength val
unGetTBQueue queue (Just b')
return (b, maxLength)
BU.unsafeUseAsCString bs $ flip (copyBytes content) len
return $ fromIntegral len
lgObjToBlob :: MonadLg m
=> BlobOid m -> ForeignPtr C'git_blob
-> LgRepository m (Git.Blob (LgRepository m))
lgObjToBlob oid fptr = do
bs <- liftIO $ withForeignPtr fptr $ \ptr -> do
size <- c'git_blob_rawsize ptr
buf <- c'git_blob_rawcontent ptr
B.packCStringLen (castPtr buf, fromIntegral size)
return $ Git.Blob oid $ Git.BlobString bs
lgLookupBlob :: MonadLg m => BlobOid m
-> LgRepository m (Git.Blob (LgRepository m))
lgLookupBlob oid =
lookupObject' (getOid (untag oid)) (getOidLen (untag oid))
c'git_blob_lookup c'git_blob_lookup_prefix
$ \boid obj _ -> lgObjToBlob (Tagged (mkOid boid)) obj
type TreeEntry m = Git.TreeEntry (LgRepository m)
lgTreeEntry :: MonadLg m => Tree m -> Git.TreeFilePath
-> LgRepository m (Maybe (TreeEntry m))
lgTreeEntry (LgTree Nothing) _ = return Nothing
lgTreeEntry (LgTree (Just tree)) fp = liftIO $ alloca $ \entryPtr ->
withFilePath fp $ \pathStr ->
withForeignPtr tree $ \treePtr -> do
r <- c'git_tree_entry_bypath entryPtr treePtr pathStr
if r < 0
then return Nothing
else Just <$> (entryToTreeEntry =<< peek entryPtr)
lgTreeOid :: MonadLg m => Tree m -> TreeOid m
lgTreeOid (LgTree Nothing) =
SU.unsafePerformIO . liftIO $
Tagged . fromJust <$> lgParseOidIO Git.emptyTreeId 40
lgTreeOid (LgTree (Just tree)) = SU.unsafePerformIO $ liftIO $ do
toid <- withForeignPtr tree c'git_tree_id
ftoid <- coidPtrToOid toid
return $ Tagged (mkOid ftoid)
lgListTreeEntries :: MonadLg m
=> Tree m
-> LgRepository m [(Git.TreeFilePath, TreeEntry m)]
lgListTreeEntries (LgTree Nothing) = return []
lgListTreeEntries (LgTree (Just tree)) =
liftIO $ withForeignPtr tree $ \tr -> do
ior <- newIORef []
r <- bracket
(mk'git_treewalk_cb (callback ior))
freeHaskellFunPtr
(flip (c'git_tree_walk tr c'GIT_TREEWALK_PRE) nullPtr)
when (r < 0) $ failure Git.TreeWalkFailed
readIORef ior
where
callback ior root te _ = do
fp <- peekFilePath root
cname <- c'git_tree_entry_name te
name <- (fp <>) <$> peekFilePath cname
entry <- entryToTreeEntry te
seq name $ seq entry $ modifyIORef ior $ \xs -> (name,entry):xs
return 0
lgMakeBuilder :: MonadLg m
=> ForeignPtr C'git_treebuilder -> TreeBuilder m
lgMakeBuilder builder = Git.TreeBuilder
{ Git.mtbBaseTreeOid = Nothing
, Git.mtbPendingUpdates = mempty
, Git.mtbNewBuilder = lgNewTreeBuilder
, Git.mtbWriteContents = \tb -> (,) <$> pure (Git.BuilderUnchanged tb)
<*> lgWriteBuilder builder
, Git.mtbLookupEntry = lgLookupBuilderEntry builder
, Git.mtbEntryCount = lgBuilderEntryCount builder
, Git.mtbPutEntry = \tb name ent ->
lgPutEntry builder name ent >> return (Git.BuilderUnchanged tb)
, Git.mtbDropEntry = \tb name ->
lgDropEntry builder name >> return (Git.BuilderUnchanged tb)
}
-- | Create a new, empty tree.
--
-- Since empty trees cannot exist in Git, attempting to write out an empty
-- tree is a no-op.
lgNewTreeBuilder :: MonadLg m
=> Maybe (Tree m) -> LgRepository m (TreeBuilder m)
lgNewTreeBuilder mtree = do
mfptr <- liftIO $ alloca $ \pptr -> do
r <- case mtree of
Nothing -> c'git_treebuilder_create pptr nullPtr
Just (LgTree Nothing) ->
c'git_treebuilder_create pptr nullPtr
Just (LgTree (Just tree)) ->
withForeignPtr tree $ \treePtr ->
c'git_treebuilder_create pptr treePtr
if r < 0
then return Nothing
else do
builder <- peek pptr
fptr <- FC.newForeignPtr builder
(c'git_treebuilder_free builder)
return $ Just fptr
case mfptr of
Nothing ->
failure (Git.TreeCreateFailed "Failed to create new tree builder")
Just fptr ->
return (lgMakeBuilder fptr)
{ Git.mtbBaseTreeOid = Git.treeOid <$> mtree }
lgPutEntry :: MonadLg m
=> ForeignPtr C'git_treebuilder -> Git.TreeFilePath -> TreeEntry m
-> LgRepository m ()
lgPutEntry builder key (treeEntryToOid -> (oid, mode)) = do
r2 <- liftIO $ withForeignPtr (getOid oid) $ \coid ->
withForeignPtr builder $ \ptr ->
withFilePath key $ \name ->
c'git_treebuilder_insert nullPtr ptr name coid
(fromIntegral mode)
when (r2 < 0) $ failure (Git.TreeBuilderInsertFailed key)
treeEntryToOid :: TreeEntry m -> (Oid, CUInt)
treeEntryToOid (Git.BlobEntry oid kind) =
(untag oid, case kind of
Git.PlainBlob -> 0o100644
Git.ExecutableBlob -> 0o100755
Git.SymlinkBlob -> 0o120000
Git.UnknownBlob -> 0o100000)
treeEntryToOid (Git.CommitEntry coid) =
(untag coid, 0o160000)
treeEntryToOid (Git.TreeEntry toid) =
(untag toid, 0o040000)
lgDropEntry :: MonadLg m
=> ForeignPtr C'git_treebuilder -> Git.TreeFilePath
-> LgRepository m ()
lgDropEntry builder key =
void $ liftIO $ withForeignPtr builder $ \ptr ->
withFilePath key $ c'git_treebuilder_remove ptr
lgLookupBuilderEntry :: MonadLg m
=> ForeignPtr C'git_treebuilder
-> Git.TreeFilePath
-> LgRepository m (Maybe (TreeEntry m))
lgLookupBuilderEntry builderPtr name = do
entry <- liftIO $ withForeignPtr builderPtr $ \builder ->
withFilePath name $ c'git_treebuilder_get builder
if entry == nullPtr
then return Nothing
else Just <$> liftIO (entryToTreeEntry entry)
lgBuilderEntryCount :: MonadLg m
=> ForeignPtr C'git_treebuilder -> LgRepository m Int
lgBuilderEntryCount tb =
fromIntegral <$> liftIO (withForeignPtr tb c'git_treebuilder_entrycount)
lgTreeEntryCount :: MonadLg m => Tree m -> LgRepository m Int
lgTreeEntryCount (LgTree Nothing) = return 0
lgTreeEntryCount (LgTree (Just tree)) =
fromIntegral <$> liftIO (withForeignPtr tree c'git_tree_entrycount)
lgWriteBuilder :: MonadLg m
=> ForeignPtr C'git_treebuilder
-> LgRepository m (TreeOid m)
lgWriteBuilder tb = do
repo <- lgGet
(r3,coid) <- liftIO $ do
coid <- mallocForeignPtr
withForeignPtr coid $ \coid' ->
withForeignPtr tb $ \builder ->
withForeignPtr (repoObj repo) $ \repoPtr -> do
r3 <- c'git_treebuilder_write coid' repoPtr builder
return (r3,coid)
when (r3 < 0) $ lgThrow Git.TreeBuilderWriteFailed
return $ Tagged (mkOid coid)
lgCloneBuilder :: MonadLg m
=> ForeignPtr C'git_treebuilder
-> LgRepository m (ForeignPtr C'git_treebuilder)
lgCloneBuilder fptr =
liftIO $ withForeignPtr fptr $ \builder -> alloca $ \pptr -> do
r <- c'git_treebuilder_create pptr nullPtr
when (r < 0) $
failure (Git.BackendError "Could not create new treebuilder")
builder' <- peek pptr
bracket
(mk'git_treebuilder_filter_cb (callback builder'))
freeHaskellFunPtr
(flip (c'git_treebuilder_filter builder) nullPtr)
FC.newForeignPtr builder' (c'git_treebuilder_free builder')
where
callback builder te _ = do
cname <- c'git_tree_entry_name te
coid <- c'git_tree_entry_id te
fmode <- c'git_tree_entry_filemode te
r <- c'git_treebuilder_insert
nullPtr
builder
cname
coid
fmode
when (r < 0) $
failure (Git.BackendError "Could not insert entry in treebuilder")
return 0
lgLookupTree :: MonadLg m => TreeOid m -> LgRepository m (Tree m)
lgLookupTree (untag -> oid)
| show oid == unpack Git.emptyTreeId = return $ LgTree Nothing
| otherwise = do
fptr <- lookupObject' (getOid oid) (getOidLen oid)
c'git_tree_lookup c'git_tree_lookup_prefix $
\_ obj _ -> return obj
return $ LgTree (Just fptr)
entryToTreeEntry :: Ptr C'git_tree_entry -> IO (TreeEntry m)
entryToTreeEntry entry = do
coid <- c'git_tree_entry_id entry
oid <- coidPtrToOid coid
typ <- c'git_tree_entry_type entry
case () of
() | typ == c'GIT_OBJ_BLOB ->
do mode <- c'git_tree_entry_filemode entry
return $ Git.BlobEntry (Tagged (mkOid oid)) $
case mode of
0o100644 -> Git.PlainBlob
0o100755 -> Git.ExecutableBlob
0o120000 -> Git.SymlinkBlob
_ -> Git.UnknownBlob
| typ == c'GIT_OBJ_TREE ->
return $ Git.TreeEntry (Tagged (mkOid oid))
| typ == c'GIT_OBJ_COMMIT ->
return $ Git.CommitEntry (Tagged (mkOid oid))
| otherwise -> error "Unexpected"
lgObjToCommit :: MonadLg m
=> CommitOid m -> Ptr C'git_commit -> IO (Commit m)
lgObjToCommit oid c = do
enc <- c'git_commit_message_encoding c
encs <- if enc == nullPtr
then return "UTF-8"
else peekCString enc
conv <- U.open encs (Just False)
msg <- c'git_commit_message c >>= B.packCString
auth <- c'git_commit_author c >>= packSignature conv
comm <- c'git_commit_committer c >>= packSignature conv
toid <- c'git_commit_tree_id c
toid' <- coidPtrToOid toid
pn <- c'git_commit_parentcount c
poids <- zipWithM ($)
(replicate (fromIntegral (toInteger pn))
(c'git_commit_parent_id c))
[0..pn]
poids' <- mapM (\x -> Tagged . mkOid <$> coidPtrToOid x) poids
return Git.Commit
{
-- Git.commitInfo = Base (Just (Tagged (Oid coid))) (Just obj)
-- ,
Git.commitOid = oid
, Git.commitTree = Tagged (mkOid toid')
, Git.commitParents = poids'
, Git.commitAuthor = auth
, Git.commitCommitter = comm
, Git.commitLog = U.toUnicode conv msg
, Git.commitEncoding = "utf-8"
}
lgLookupCommit :: MonadLg m
=> CommitOid m -> LgRepository m (Commit m)
lgLookupCommit oid =
lookupObject' (getOid (untag oid)) (getOidLen (untag oid))
c'git_commit_lookup c'git_commit_lookup_prefix
$ \coid obj _ -> liftIO $ withForeignPtr obj $
lgObjToCommit (Tagged (mkOid coid))
data ObjectPtr = BlobPtr (ForeignPtr C'git_blob)
| TreePtr (ForeignPtr C'git_commit)
| CommitPtr (ForeignPtr C'git_commit)
| TagPtr (ForeignPtr C'git_tag)
lgLookupObject :: MonadLg m
=> Oid -> LgRepository m (Git.Object (LgRepository m))
lgLookupObject oid = do
(oid', typ, fptr) <-
lookupObject' (getOid oid) (getOidLen oid)
(\x y z -> c'git_object_lookup x y z c'GIT_OBJ_ANY)
(\x y z l -> c'git_object_lookup_prefix x y z l c'GIT_OBJ_ANY)
$ \coid fptr y -> do
typ <- liftIO $ c'git_object_type y
return (mkOid coid, typ, fptr)
case () of
() | typ == c'GIT_OBJ_BLOB ->
Git.BlobObj <$> lgObjToBlob (Tagged oid') (castForeignPtr fptr)
| typ == c'GIT_OBJ_TREE ->
-- A ForeignPtr C'git_object is bit-wise equivalent to a
-- ForeignPtr C'git_tree.
return $ Git.TreeObj (LgTree (Just (unsafeCoerce fptr)))
| typ == c'GIT_OBJ_COMMIT ->
Git.CommitObj <$>
liftIO (withForeignPtr fptr $ \y ->
lgObjToCommit (Tagged oid') (castPtr y))
| typ == c'GIT_OBJ_TAG -> error "jww (2013-07-08): NYI"
| otherwise -> error $ "Unknown object type: " ++ show typ
lgExistsObject :: MonadLg m => Oid -> LgRepository m Bool
lgExistsObject oid = do
repo <- lgGet
result <- liftIO $ withForeignPtr (repoObj repo) $ \repoPtr ->
alloca $ \pptr -> do
r <- c'git_repository_odb pptr repoPtr
if r < 0
then return Nothing
else
-- jww (2013-02-28): Need to guard against exceptions so that
-- ptr doesn't leak.
withForeignPtr (getOid oid) $ \coid -> do
ptr <- peek pptr
r1 <- c'git_odb_exists ptr coid 0
c'git_odb_free ptr
return (Just (r1 == 0))
maybe (failure Git.RepositoryInvalid) return result
lgForEachObject :: Ptr C'git_odb
-> (Ptr C'git_oid -> Ptr () -> IO CInt)
-> Ptr ()
-> IO CInt
lgForEachObject odbPtr f payload =
bracket
(mk'git_odb_foreach_cb f)
freeHaskellFunPtr
(flip (c'git_odb_foreach odbPtr) payload)
lgSourceObjects
:: MonadLg m
=> Maybe (CommitOid m) -> CommitOid m -> Bool
-> Producer (LgRepository m) (ObjectOid m)
lgSourceObjects mhave need alsoTrees = do
repo <- lift lgGet
walker <- liftIO $ alloca $ \pptr -> do
r <- withForeignPtr (repoObj repo) $ \repoPtr ->
c'git_revwalk_new pptr repoPtr
when (r < 0) $
failure (Git.BackendError "Could not create revwalker")
ptr <- peek pptr
newForeignPtr p'git_revwalk_free ptr
c <- lift $ lgLookupCommit need
let oid = untag (Git.commitOid c)
liftIO $ putStrLn $ "mhave = " ++ show mhave
liftIO $ putStrLn $ "need = " ++ show need
liftIO $ putStrLn $ "oid = " ++ show oid
liftIO $ withForeignPtr (getOid oid) $ \coid -> do
r2 <- withForeignPtr walker $ flip c'git_revwalk_push coid
when (r2 < 0) $
failure (Git.BackendError $ "Could not push oid "
<> pack (show oid) <> " onto revwalker")
case mhave of
Nothing -> return ()
Just have -> liftIO $ withForeignPtr (getOid (untag have)) $ \coid -> do
r2 <- withForeignPtr walker $ flip c'git_revwalk_hide coid
when (r2 < 0) $
failure (Git.BackendError $ "Could not hide commit "
<> pack (show (untag have)) <> " from revwalker")
liftIO $ withForeignPtr walker $ flip c'git_revwalk_sorting
(fromIntegral ((1 :: Int) .|. (4 :: Int)))
coidPtr <- liftIO mallocForeignPtr
whileM_ ((==) <$> pure 0
<*> liftIO (withForeignPtr walker $ \walker' ->
withForeignPtr coidPtr $ \coidPtr' ->
c'git_revwalk_next coidPtr' walker')) $ do
oidPtr <- liftIO $ withForeignPtr coidPtr coidPtrToOid
do
let coid = Tagged (mkOid oidPtr)
yield $ Git.CommitObjOid coid
when alsoTrees $ do
c <- lift $ lgLookupCommit coid
yield $ Git.TreeObjOid (Git.commitTree c)
-- | Write out a commit to its repository. If it has already been written,
-- nothing will happen.
lgCreateCommit :: MonadLg m
=> [CommitOid m]
-> TreeOid m
-> Git.Signature
-> Git.Signature
-> Git.CommitMessage
-> Maybe Git.RefName
-> LgRepository m (Commit m)
lgCreateCommit pptrs tree author committer logText ref = do
repo <- lgGet
let toid = getOid . untag $ tree
coid <- liftIO $ withForeignPtr (repoObj repo) $ \repoPtr -> do
coid <- mallocForeignPtr
conv <- U.open "utf-8" (Just True)
withForeignPtr coid $ \coid' ->
withForeignPtr toid $ \toid' ->
withForeignPtrs (map (getOid . untag) pptrs) $ \pptrs' ->
B.useAsCString (U.fromUnicode conv logText) $ \message ->
withRef ref $ \update_ref ->
withSignature conv author $ \author' ->
withSignature conv committer $ \committer' ->
withEncStr "utf-8" $ \_ {-message_encoding-} -> do
parents' <- newArray pptrs'
r <- c'git_commit_create_oid coid' repoPtr
update_ref author' committer'
nullPtr message toid'
(fromIntegral (L.length pptrs)) parents'
when (r < 0) $ throwIO Git.CommitCreateFailed
return coid
return Git.Commit
{
-- Git.commitInfo = Base (Just (Tagged (Oid coid))) Nothing
-- ,
Git.commitOid = Tagged (mkOid coid)
, Git.commitTree = tree
, Git.commitParents = pptrs
, Git.commitAuthor = author
, Git.commitCommitter = committer
, Git.commitLog = logText
, Git.commitEncoding = "utf-8"
}
where
withRef Nothing = flip ($) nullPtr
withRef (Just name) = B.useAsCString (T.encodeUtf8 name)
withEncStr "" = flip ($) nullPtr
withEncStr enc = withCString enc
withForeignPtrs :: [ForeignPtr a] -> ([Ptr a] -> IO b) -> IO b
withForeignPtrs fos io = do
r <- io (map FU.unsafeForeignPtrToPtr fos)
mapM_ touchForeignPtr fos
return r
lgLookupRef :: MonadLg m
=> Git.RefName -> LgRepository m (Maybe (RefTarget m))
lgLookupRef name = do
repo <- lgGet
liftIO $ alloca $ \ptr -> do
r <- withForeignPtr (repoObj repo) $ \repoPtr ->
withCString (unpack name) $ \namePtr ->
c'git_reference_lookup ptr repoPtr namePtr
if r < 0
then return Nothing
else do
ref <- peek ptr
typ <- c'git_reference_type ref
targ <- if typ == c'GIT_REF_OID
then do oidPtr <- c'git_reference_target ref
Git.RefObj . mkOid
<$> coidPtrToOid oidPtr
else do targName <- c'git_reference_symbolic_target ref
Git.RefSymbolic . T.decodeUtf8
<$> B.packCString targName
c'git_reference_free ref
return (Just targ)
lgUpdateRef :: MonadLg m
=> Git.RefName -> Git.RefTarget (LgRepository m)
-> LgRepository m ()
lgUpdateRef name refTarg = do
repo <- lgGet
r <- liftIO $ alloca $ \ptr ->
withForeignPtr (repoObj repo) $ \repoPtr ->
withCString (unpack name) $ \namePtr ->
case refTarg of
Git.RefObj oid ->
withForeignPtr (getOid oid) $ \coidPtr ->
c'git_reference_create ptr repoPtr namePtr
coidPtr (fromBool True)
Git.RefSymbolic symName ->
withCString (unpack symName) $ \symPtr ->
c'git_reference_symbolic_create ptr repoPtr namePtr
symPtr (fromBool True)
when (r < 0) $ lgThrow Git.ReferenceCreateFailed
-- int git_reference_name_to_oid(git_oid *out, git_repository *repo,
-- const char *name)
lgResolveRef :: MonadLg m
=> Git.RefName -> LgRepository m (Maybe (CommitOid m))
lgResolveRef name = do
repo <- lgGet
oid <- liftIO $ alloca $ \ptr ->
withCString (unpack name) $ \namePtr ->
withForeignPtr (repoObj repo) $ \repoPtr -> do
r <- c'git_reference_name_to_id ptr repoPtr namePtr
if r < 0
then return Nothing
else Just <$> coidPtrToOid ptr
return $ Tagged . mkOid <$> oid
-- int git_reference_rename(git_reference *ref, const char *new_name,
-- int force)
--renameRef = c'git_reference_rename
lgDeleteRef :: MonadLg m => Git.RefName -> LgRepository m ()
lgDeleteRef name = do
repo <- lgGet
r <- liftIO $ alloca $ \ptr ->
withCString (unpack name) $ \namePtr ->
withForeignPtr (repoObj repo) $ \repoPtr -> do
r <- c'git_reference_lookup ptr repoPtr namePtr
if r < 0
then return r
else do
ref <- peek ptr
c'git_reference_delete ref
when (r < 0) $ failure (Git.ReferenceDeleteFailed name)
-- int git_reference_packall(git_repository *repo)
--packallRefs = c'git_reference_packall
data ListFlags = ListFlags { listFlagInvalid :: Bool
, listFlagOid :: Bool
, listFlagSymbolic :: Bool
, listFlagPacked :: Bool
, listFlagHasPeel :: Bool }
deriving (Show, Eq)
allRefsFlag :: ListFlags
allRefsFlag = ListFlags { listFlagInvalid = False
, listFlagOid = True
, listFlagSymbolic = True
, listFlagPacked = True
, listFlagHasPeel = False }
-- symbolicRefsFlag :: ListFlags
-- symbolicRefsFlag = ListFlags { listFlagInvalid = False
-- , listFlagOid = False
-- , listFlagSymbolic = True
-- , listFlagPacked = False
-- , listFlagHasPeel = False }
-- oidRefsFlag :: ListFlags
-- oidRefsFlag = ListFlags { listFlagInvalid = False
-- , listFlagOid = True
-- , listFlagSymbolic = False
-- , listFlagPacked = True
-- , listFlagHasPeel = False }
-- looseOidRefsFlag :: ListFlags
-- looseOidRefsFlag = ListFlags { listFlagInvalid = False
-- , listFlagOid = True
-- , listFlagSymbolic = False
-- , listFlagPacked = False
-- , listFlagHasPeel = False }
gitStrArray2List :: Ptr C'git_strarray -> IO [Text]
gitStrArray2List gitStrs = do
count <- fromIntegral <$> peek (p'git_strarray'count gitStrs)
strings <- peek $ p'git_strarray'strings gitStrs
r0 <- Foreign.Marshal.Array.peekArray count strings
r1 <- sequence $ fmap peekCString r0
return $ fmap pack r1
flagsToInt :: ListFlags -> CUInt
flagsToInt flags = (if listFlagOid flags then 1 else 0)
+ (if listFlagSymbolic flags then 2 else 0)
+ (if listFlagPacked flags then 4 else 0)
+ (if listFlagHasPeel flags then 8 else 0)
listRefNames :: MonadLg m => ListFlags -> LgRepository m [Git.RefName]
listRefNames flags = do
repo <- lgGet
refs <- liftIO $ alloca $ \c'refs ->
withForeignPtr (repoObj repo) $ \repoPtr -> do
r <- c'git_reference_list c'refs repoPtr (flagsToInt flags)
if r < 0
then return Nothing
else do refs <- gitStrArray2List c'refs
c'git_strarray_free c'refs
return (Just refs)
maybe (failure Git.ReferenceListingFailed) return refs
lgListRefs :: MonadLg m => LgRepository m [Git.RefName]
lgListRefs = listRefNames allRefsFlag
-- foreachRefCallback :: CString -> Ptr () -> IO CInt
-- foreachRefCallback name payload = do
-- (callback,results) <- deRefStablePtr =<< peek (castPtr payload)
-- nameStr <- peekCString name
-- result <- callback (pack nameStr)
-- modifyIORef results (\xs -> result:xs)
-- return 0
-- foreign export ccall "foreachRefCallback"
-- foreachRefCallback :: CString -> Ptr () -> IO CInt
-- foreign import ccall "&foreachRefCallback"
-- foreachRefCallbackPtr :: FunPtr (CString -> Ptr () -> IO CInt)
-- lgMapRefs :: (Text -> LgRepository a) -> LgRepository [a]
-- lgMapRefs cb = do
-- repo <- lgGet
-- liftIO $ do
-- withForeignPtr (repoObj repo) $ \repoPtr -> do
-- ioRef <- newIORef []
-- bracket
-- (newStablePtr (cb,ioRef))
-- freeStablePtr
-- (\ptr -> with ptr $ \pptr -> do
-- _ <- c'git_reference_foreach
-- repoPtr (flagsToInt allRefsFlag)
-- foreachRefCallbackPtr (castPtr pptr)
-- readIORef ioRef)
-- mapAllRefs :: (Text -> LgRepository a) -> LgRepository [a]
-- mapAllRefs repo = mapRefs repo allRefsFlag
-- mapOidRefs :: (Text -> LgRepository a) -> LgRepository [a]
-- mapOidRefs repo = mapRefs repo oidRefsFlag
-- mapLooseOidRefs :: (Text -> LgRepository a) -> LgRepository [a]
-- mapLooseOidRefs repo = mapRefs repo looseOidRefsFlag
-- mapSymbolicRefs :: (Text -> LgRepository a) -> LgRepository [a]
-- mapSymbolicRefs repo = mapRefs repo symbolicRefsFlag
-- int git_reference_is_packed(git_reference *ref)
--refIsPacked = c'git_reference_is_packed
-- int git_reference_reload(git_reference *ref)
--reloadRef = c'git_reference_reload
-- int git_reference_cmp(git_reference *ref1, git_reference *ref2)
--compareRef = c'git_reference_cmp
-- | Gather output values asynchronously from an action in the base monad and
-- then yield them downstream. This provides a means of working around the
-- restriction that 'ConduitM' cannot be an instance of 'MonadBaseControl'
-- in order to, for example, yield values from within a Haskell callback
-- function called from a C library.
gatherFrom :: (MonadIO m, MonadBaseControl IO m)
=> Int -- ^ Size of the queue to create
-> (TBQueue o -> m ()) -- ^ Action that generates output values
-> Producer m o
gatherFrom size scatter = do
chan <- liftIO $ newTBQueueIO size
worker <- lift $ async (scatter chan)
lift . restoreM =<< gather worker chan
where
gather worker chan = do
(xs, mres) <- liftIO $ atomically $ do
xs <- whileM (not <$> isEmptyTBQueue chan) (readTBQueue chan)
(xs,) <$> pollSTM worker
mapM_ yield xs
case mres of
Just (Left e) -> liftIO $ throwIO (e :: SomeException)
Just (Right r) -> return r
Nothing -> gather worker chan
drainTo :: (MonadIO m, MonadBaseControl IO m)
=> Int -- ^ Size of the queue to create
-> (TBQueue (Maybe i) -> m r) -- ^ Action to consume input values
-> Consumer i m r
drainTo size gather = do
chan <- liftIO $ newTBQueueIO size
worker <- lift $ async (gather chan)
lift . restoreM =<< scatter worker chan
where
scatter worker chan = do
mval <- await
(mx, action) <- liftIO $ atomically $ do
mres <- pollSTM worker
case mres of
Just (Left e) ->
return (Nothing, liftIO $ throwIO (e :: SomeException))
Just (Right r) ->
return (Just r, return ())
Nothing -> do
writeTBQueue chan mval
return (Nothing, return ())
action
case mx of
Just x -> return x
Nothing -> scatter worker chan
lgThrow :: (MonadIO m, Failure e m) => (Text -> e) -> m ()
lgThrow f = do
errStr <- liftIO $ do
errPtr <- c'giterr_last
if errPtr == nullPtr
then return ""
else do
err <- peek errPtr
peekCString (c'git_error'message err)
failure (f (pack errStr))
lgDiffContentsWithTree
:: MonadLg m
=> Source m (Either Git.TreeFilePath ByteString)
-> Tree m
-> Producer (LgRepository m) ByteString
lgDiffContentsWithTree _contents (LgTree Nothing) =
liftIO $ throwIO $
Git.DiffTreeToIndexFailed "Cannot diff against an empty tree"
lgDiffContentsWithTree contents tree = do
repo <- lift lgGet
gatherFrom 16 $ generateDiff repo
where
generateDiff repo chan = do
entries <- M.fromList <$> lgListTreeEntries tree
paths <- liftIO $ newIORef []
(src, ()) <- lift $ contents $$+ return ()
handleEntries entries paths src
contentsPaths <- liftIO $ readIORef paths
forM_ (sort (M.keys entries) \\ sort contentsPaths) $ \path ->
-- File was removed
case entries M.! path of
Git.BlobEntry oid _ -> do
let boid = getOid (untag oid)
diffBlob path Nothing (Just boid)
-- jww (2013-11-24): NYI
Git.CommitEntry _coid -> return ()
Git.TreeEntry _toid -> return ()
where
handleEntries entries paths src = do
(src', mres) <- lift $ src $$++ do
mpath <- await
case mpath of
Nothing -> return Nothing
Just path -> Just <$> handlePath path
case mres of
Nothing -> return ()
Just (path, content) -> do
liftIO $ modifyIORef paths (path:)
case M.lookup path entries of
Nothing ->
-- File is newly added
diffBlob path (Just content) Nothing
Just entry -> case entry of
-- File has been changed
Git.BlobEntry oid _ -> do
let boid = getOid (untag oid)
diffBlob path (Just content) (Just boid)
-- jww (2013-11-24): NYI
Git.CommitEntry _coid -> return ()
Git.TreeEntry _toid -> return ()
handleEntries entries paths src'
handlePath (Right _) =
liftIO $ throwIO $ Git.DiffTreeToIndexFailed
"Received a Right value when a Left RawFilePath was expected"
handlePath (Left path) = do
mcontent <- await
case mcontent of
Nothing ->
liftIO $ throwIO $ Git.DiffTreeToIndexFailed $
"Content not provided for " <> T.pack (show path)
Just x -> handleContent path x
handleContent _path (Left _) =
liftIO $ throwIO $ Git.DiffTreeToIndexFailed
"Received a Left value when a Right ByteString was expected"
handleContent path (Right content) = return (path, content)
diffBlob path mcontent mboid = do
r <- liftIO $ runResourceT $ case mboid of
Nothing -> go nullPtr
Just boid -> withBlob boid
when (r < 0) $ lgThrow Git.DiffBlobFailed
where
withBlob boid = do
(_, eblobp) <- flip allocate freeBlob $
alloca $ \blobpp ->
withForeignPtr boid $ \boidPtr ->
withForeignPtr (repoObj repo) $ \repoPtr -> do
r <- c'git_blob_lookup blobpp repoPtr boidPtr
if r < 0
then return $ Left r
else Right <$> peek blobpp
case eblobp of
Left r -> return r
Right blobp -> go blobp
where
freeBlob (Left _) = return ()
freeBlob (Right blobp) = c'git_blob_free blobp
go blobp = do
let f x = allocate x freeHaskellFunPtr
(_, file_cb') <- f $ mk'git_diff_file_cb file_cb
(_, hunk_cb') <- f $ mk'git_diff_hunk_cb hunk_cb
(_, print_cb') <- f $ mk'git_diff_data_cb print_cb
let diff s l =
c'git_diff_blob_to_buffer blobp s (fromIntegral l)
nullPtr file_cb' hunk_cb' print_cb' nullPtr
liftIO $ case mcontent of
Nothing -> diff nullPtr 0
Just c -> BU.unsafeUseAsCStringLen c $ uncurry diff
isBinary delta =
c'git_diff_delta'flags delta .&. c'GIT_DIFF_FLAG_BINARY /= 0
deltaFileName = fmap (T.encodeUtf8 . T.pack) . peekCString
. c'git_diff_file'path
file_cb :: Ptr C'git_diff_delta
-> CFloat
-> Ptr ()
-> IO CInt
file_cb deltap _progress _payload = do
delta <- peek deltap
atomically $
if isBinary delta
then writeTBQueue chan $
"Binary files a/" <> path
<> " and b/" <> path <> " differ\n"
else do
writeTBQueue chan $ "--- a/" <> path <> "\n"
writeTBQueue chan $ "+++ b/" <> path <> "\n"
return 0
hunk_cb :: Ptr C'git_diff_delta
-> Ptr C'git_diff_range
-> CString
-> CSize
-> Ptr ()
-> IO CInt
hunk_cb deltap _rangep header headerLen _payload = do
delta <- peek deltap
unless (isBinary delta) $ do
bs <- curry B.packCStringLen header (fromIntegral headerLen)
atomically $ writeTBQueue chan bs
return 0
print_cb :: Ptr C'git_diff_delta
-> Ptr C'git_diff_range
-> CChar
-> CString
-> CSize
-> Ptr ()
-> IO CInt
print_cb deltap _range lineOrigin content contentLen _payload = do
delta <- peek deltap
unless (isBinary delta) $ do
bs <- curry B.packCStringLen content
(fromIntegral contentLen)
atomically $ writeTBQueue chan $
B.cons (fromIntegral lineOrigin) bs
return 0
checkResult :: (Eq a, Num a, Failure Git.GitException m) => a -> Text -> m ()
checkResult r why = when (r /= 0) $ failure (Git.BackendError why)
lgBuildPackFile :: MonadLg m
=> FilePath -> [Either (CommitOid m) (TreeOid m)]
-> LgRepository m FilePath
lgBuildPackFile dir oids = do
repo <- lgGet
liftIO $ do
(filePath, fHandle) <- openBinaryTempFile dir "pack"
hClose fHandle
go repo filePath
return filePath
where
go repo path = runResourceT $ do
delKey <- register $ removeFile path
(_,bPtrPtr) <- allocate malloc free
(_,bPtr) <- flip allocate c'git_packbuilder_free $
liftIO $ withForeignPtr (repoObj repo) $ \repoPtr -> do
r <- c'git_packbuilder_new bPtrPtr repoPtr
checkResult r "c'git_packbuilder_new failed"
peek bPtrPtr
forM_ oids $ \oid -> case oid of
-- jww (2013-04-24): When libgit2 0.19 comes out, we will only
-- need to call c'git_packbuilder_insert_commit here, as it will
-- insert both the commit and its tree.
Left coid ->
actOnOid
(flip (c'git_packbuilder_insert bPtr) nullPtr)
(untag coid)
"c'git_packbuilder_insert failed"
Right toid ->
actOnOid
(c'git_packbuilder_insert_tree bPtr)
(untag toid)
"c'git_packbuilder_insert_tree failed"
liftIO $ do
r1 <- c'git_packbuilder_set_threads bPtr 0
checkResult r1 "c'git_packbuilder_set_threads failed"
withCString path $ \cstr -> do
r2 <- c'git_packbuilder_write bPtr cstr
checkResult r2 "c'git_packbuilder_write failed"
void $ unprotect delKey
actOnOid f oid msg =
liftIO $ withForeignPtr (getOid oid) $ \oidPtr -> do
r <- f oidPtr
checkResult r msg
lift_ :: (Monad m, Functor (t m), MonadTrans t) => m a -> t m ()
lift_ = void . lift
lgBuildPackIndexWrapper :: MonadLg m
=> FilePath
-> ByteString
-> LgRepository m (Text, FilePath, FilePath)
lgBuildPackIndexWrapper = (lift .) . lgBuildPackIndex
lgBuildPackIndex :: (MonadLg m, MonadLogger m)
=> FilePath -> ByteString -> m (Text, FilePath, FilePath)
lgBuildPackIndex dir bytes = do
sha <- go dir bytes
return (sha, dir </> ("pack-" <> unpack sha <> ".pack"),
dir </> ("pack-" <> unpack sha <> ".idx"))
where
go dir bytes = control $ \run -> alloca $ \idxPtrPtr -> runResourceT $ do
lift_ . run $ lgDebug "Allocate a new indexer stream"
(_,idxPtr) <- flip allocate c'git_indexer_stream_free $
withCString dir $ \dirStr -> do
r <- c'git_indexer_stream_new idxPtrPtr dirStr
nullFunPtr nullPtr
checkResult r "c'git_indexer_stream_new failed"
peek idxPtrPtr
lift_ . run $
lgDebug $ "Add the incoming packfile data to the stream ("
++ show (B.length bytes) ++ " bytes)"
(_,statsPtr) <- allocate calloc free
liftIO $ BU.unsafeUseAsCStringLen bytes $
uncurry $ \dataPtr dataLen -> do
r <- c'git_indexer_stream_add idxPtr (castPtr dataPtr)
(fromIntegral dataLen) statsPtr
checkResult r "c'git_indexer_stream_add failed"
lift_ . run $ lgDebug "Finalizing the stream"
r <- liftIO $ c'git_indexer_stream_finalize idxPtr statsPtr
checkResult r "c'git_indexer_stream_finalize failed"
lift_ . run $
lgDebug "Discovering the hash used to identify the pack file"
sha <- liftIO $ oidToSha =<< c'git_indexer_stream_hash idxPtr
lift_ . run $ lgDebug $ "The hash used is: " ++ show (Git.shaToText sha)
lift . run $ return (Git.shaToText sha)
oidToSha :: Ptr C'git_oid -> IO Git.SHA
oidToSha oidPtr =
Git.SHA <$> B.packCStringLen
(castPtr oidPtr, sizeOf (undefined :: C'git_oid))
shaToOid :: Git.SHA -> IO (ForeignPtr C'git_oid)
shaToOid (Git.SHA bs) = BU.unsafeUseAsCString bs $ \bytes -> do
ptr <- mallocForeignPtr
withForeignPtr ptr $ \ptr' -> do
c'git_oid_fromraw ptr' (castPtr bytes)
return ptr
lgCopyPackFile :: MonadLg m => FilePath -> LgRepository m ()
lgCopyPackFile packFile = do
-- jww (2013-04-23): This would be much more efficient (we already have
-- the pack file on disk, why not just copy it?), but we have no way at
-- present of communicating with the S3 backend directly.
-- S3.uploadPackAndIndex undefined (F.directory packFile) packSha
-- Use the ODB backend interface to transfer the pack file, which
-- inefficiently transfers the pack file as a strict ByteString in memory,
-- only to be written to disk again on the other side. However, since
-- this algorithm knows nothing about S3 or the S3 backend, this is our
-- only way of talking to that backend.
--
-- The abstract API does have a writePackFile method, but we can't use it
-- yet because it only calls into the Libgit2 backend, which doesn't know
-- anything about the S3 backend. As far as Libgit2 is concerned, the S3
-- backend is just a black box with no special properties.
repo <- lgGet
control $ \run -> withForeignPtr (repoObj repo) $ \repoPtr ->
alloca $ \odbPtrPtr ->
alloca $ \statsPtr ->
alloca $ \writepackPtrPtr -> do
runResourceT $ go run repoPtr odbPtrPtr writepackPtrPtr statsPtr
run $ return ()
where
go run repoPtr odbPtrPtr writepackPtrPtr statsPtr = do
lift_ . run $ lgDebug "Obtaining odb for repository"
(_,odbPtr) <- flip allocate c'git_odb_free $ do
r <- c'git_repository_odb odbPtrPtr repoPtr
checkResult r "c'git_repository_odb failed"
peek odbPtrPtr
lift_ . run $ lgDebug "Opening pack writer into odb"
(_,writepackPtr) <- allocate
(do r <- c'git_odb_write_pack writepackPtrPtr odbPtr
nullFunPtr nullPtr
checkResult r "c'git_odb_write_pack failed"
peek writepackPtrPtr)
(\writepackPtr -> do
writepack <- peek writepackPtr
mK'git_odb_writepack_free_callback
(c'git_odb_writepack'free writepack) writepackPtr)
writepack <- liftIO $ peek writepackPtr
bs <- liftIO $ B.readFile packFile
lift_ . run $
lgDebug $ "Writing pack file " ++ show packFile ++ " into odb"
lift_ . run $
lgDebug $ "Writing " ++ show (B.length bs) ++ " pack bytes into odb"
liftIO $ BU.unsafeUseAsCStringLen bs $
uncurry $ \dataPtr dataLen -> do
r <- mK'git_odb_writepack_add_callback
(c'git_odb_writepack'add writepack)
writepackPtr (castPtr dataPtr)
(fromIntegral dataLen) statsPtr
checkResult r "c'git_odb_writepack'add failed"
lift_ . run $ lgDebug "Committing pack into odb"
r <- liftIO $ mK'git_odb_writepack_commit_callback
(c'git_odb_writepack'commit writepack) writepackPtr
statsPtr
checkResult r "c'git_odb_writepack'commit failed"
lgLoadPackFileInMemory :: (MonadLg m, MonadUnsafeIO m, MonadThrow m,
MonadLogger m)
=> FilePath
-> Ptr (Ptr C'git_odb_backend)
-> Ptr (Ptr C'git_odb)
-> ResourceT m (Ptr C'git_odb)
lgLoadPackFileInMemory idxPath backendPtrPtr odbPtrPtr = do
lgDebug "Creating temporary, in-memory object database"
(freeKey,odbPtr) <- flip allocate c'git_odb_free $ do
r <- c'git_odb_new odbPtrPtr
checkResult r "c'git_odb_new failed"
peek odbPtrPtr
lgDebug $ "Load pack index " ++ show idxPath ++ " into temporary odb"
(_,backendPtr) <- allocate
(do r <- withCString idxPath $ \idxPathStr ->
c'git_odb_backend_one_pack backendPtrPtr idxPathStr
checkResult r "c'git_odb_backend_one_pack failed"
peek backendPtrPtr)
(\backendPtr -> do
backend <- peek backendPtr
mK'git_odb_backend_free_callback
(c'git_odb_backend'free backend) backendPtr)
-- Since freeing the backend will now free the object database, unregister
-- the finalizer we had setup for the odbPtr
void $ unprotect freeKey
-- Associate the new backend containing our single index file with the
-- in-memory object database
lgDebug "Associate odb with backend"
r <- liftIO $ c'git_odb_add_backend odbPtr backendPtr 1
checkResult r "c'git_odb_add_backend failed"
return odbPtr
lgWithPackFile :: (MonadLg m, MonadUnsafeIO m, MonadThrow m, MonadLogger m)
=> FilePath -> (Ptr C'git_odb -> ResourceT m a) -> m a
lgWithPackFile idxPath f = control $ \run ->
alloca $ \odbPtrPtr ->
alloca $ \backendPtrPtr -> run $ runResourceT $ do
lift $ lgDebug "Load pack file into an in-memory object database"
odbPtr <- lgLoadPackFileInMemory idxPath backendPtrPtr odbPtrPtr
lift $ lgDebug "Calling function using in-memory odb"
f odbPtr
lgReadFromPack :: (MonadLg m, MonadUnsafeIO m, MonadThrow m, MonadLogger m)
=> FilePath -> Git.SHA -> Bool
-> m (Maybe (C'git_otype, CSize, ByteString))
lgReadFromPack idxPath sha metadataOnly =
control $ \run -> alloca $ \objectPtrPtr ->
run $ lgWithPackFile idxPath $ \odbPtr -> do
foid <- liftIO $ shaToOid sha
if metadataOnly
then readMetadata odbPtr foid
else readObject odbPtr foid objectPtrPtr
where
readMetadata odbPtr foid =
liftIO $ alloca $ \sizePtr -> alloca $ \typPtr -> do
r <- withForeignPtr foid $
c'git_odb_read_header sizePtr typPtr odbPtr
if r == 0
then Just <$> ((,,) <$> peek typPtr
<*> peek sizePtr
<*> pure B.empty)
else do
unless (r == c'GIT_ENOTFOUND) $
checkResult r "c'git_odb_read_header failed"
return Nothing
readObject odbPtr foid objectPtrPtr = do
r <- liftIO $ withForeignPtr foid $
c'git_odb_read objectPtrPtr odbPtr
mr <-
if r == 0
then do
objectPtr <- liftIO $ peek objectPtrPtr
void $ register $ c'git_odb_object_free objectPtr
return $ Just objectPtr
else do
unless (r == c'GIT_ENOTFOUND) $
checkResult r "c'git_odb_read failed"
return Nothing
forM mr $ \objectPtr -> liftIO $ do
typ <- c'git_odb_object_type objectPtr
len <- c'git_odb_object_size objectPtr
ptr <- c'git_odb_object_data objectPtr
bytes <- curry B.packCStringLen (castPtr ptr)
(fromIntegral len)
return (typ,len,bytes)
lgRemoteFetch :: MonadLg m => Text -> Text -> LgRepository m ()
lgRemoteFetch uri fetchSpec = do
xferRepo <- lgGet
liftIO $ withForeignPtr (repoObj xferRepo) $ \repoPtr ->
withCString (unpack uri) $ \uriStr ->
withCString (unpack fetchSpec) $ \fetchStr ->
alloca $ runResourceT . go repoPtr uriStr fetchStr
where
go repoPtr uriStr fetchStr remotePtrPtr = do
(_,remotePtr) <- flip allocate c'git_remote_free $ do
r <- c'git_remote_create_inmemory remotePtrPtr repoPtr
fetchStr uriStr
checkResult r "c'git_remote_create_inmemory failed"
peek remotePtrPtr
r1 <- liftIO $ c'git_remote_connect remotePtr c'GIT_DIRECTION_FETCH
checkResult r1 "c'git_remote_connect failed"
void $ register $ c'git_remote_disconnect remotePtr
r2 <- liftIO $ c'git_remote_download remotePtr nullFunPtr nullPtr
checkResult r2 "c'git_remote_download failed"
lgFactory :: MonadIO m
=> Git.RepositoryFactory
(LgRepository (NoLoggingT m)) m Repository
lgFactory = Git.RepositoryFactory
{ Git.openRepository = runNoLoggingT . openLgRepository
, Git.runRepository = \c m ->
runNoLoggingT $ runLgRepository c m
, Git.closeRepository = runNoLoggingT . closeLgRepository
, Git.getRepository = hoist NoLoggingT lgGet
, Git.defaultOptions = defaultLgOptions
, Git.startupBackend = runNoLoggingT startupLgBackend
, Git.shutdownBackend = runNoLoggingT shutdownLgBackend
}
lgFactoryLogger :: (MonadIO m, MonadLogger m)
=> Git.RepositoryFactory (LgRepository m) m Repository
lgFactoryLogger = Git.RepositoryFactory
{ Git.openRepository = openLgRepository
, Git.runRepository = runLgRepository
, Git.closeRepository = closeLgRepository
, Git.getRepository = lgGet
, Git.defaultOptions = defaultLgOptions
, Git.startupBackend = startupLgBackend
, Git.shutdownBackend = shutdownLgBackend
}
openLgRepository :: MonadIO m => Git.RepositoryOptions -> m Repository
openLgRepository opts = do
startupLgBackend
let path = Git.repoPath opts
p <- liftIO $ doesDirectoryExist path
liftIO $ openRepositoryWith path $
if not (Git.repoAutoCreate opts) || p
then c'git_repository_open
else \x y -> c'git_repository_init x y
(fromBool (Git.repoIsBare opts))
where
openRepositoryWith path fn = do
fptr <- alloca $ \ptr ->
withCString path $ \str -> do
r <- fn ptr str
when (r < 0) $
error $ "Could not open repository " ++ show path
ptr' <- peek ptr
newForeignPtr p'git_repository_free ptr'
excTrap <- newIORef Nothing
return Repository { repoOptions = opts
, repoObj = fptr
, repoExcTrap = excTrap
}
runLgRepository :: MonadIO m => Repository -> LgRepository m a -> m a
runLgRepository repo action = do
startupLgBackend
runReaderT (lgRepositoryReaderT action) repo
closeLgRepository :: Monad m => Repository -> m ()
closeLgRepository = const (return ())
defaultLgOptions :: Git.RepositoryOptions
defaultLgOptions = Git.RepositoryOptions "" False False
startupLgBackend :: MonadIO m => m ()
startupLgBackend = liftIO (void c'git_threads_init)
shutdownLgBackend :: MonadIO m => m ()
shutdownLgBackend = liftIO c'git_threads_shutdown
-- Libgit2.hs