add getFileSize, which can get the real size of a large file on Windows

Avoid using fileSize which maxes out at just 2 gb on Windows.
Instead, use hFileSize, which doesn't have a bounded size.
Fixes support for files > 2 gb on Windows.

Note that the InodeCache code only needs to compare a file size,
so it doesn't matter it the file size wraps. So it has been
left as-is. This was necessary both to avoid invalidating existing inode
caches, and because the code passed FileStatus around and would have become
more expensive if it called getFileSize.

This commit was sponsored by Christian Dietrich.

Annex/Content.hs

@@ -234,8 +234,8 @@ prepGetViaTmpChecked key unabletoget getkey = do
 	tmp <- fromRepo $ gitAnnexTmpObjectLocation key
 
 	e <- liftIO $ doesFileExist tmp
-	alreadythere <- if e
-		then fromIntegral . fileSize <$> liftIO (getFileStatus tmp)
+	alreadythere <- liftIO $ if e
+		then getFileSize tmp
 		else return 0
 	ifM (checkDiskSpace Nothing key alreadythere)
 		( do

Annex/Transfer.hs

@@ -132,8 +132,7 @@ runTransfer' ignorelock t file shouldretry a = do
 			liftIO $ readMVar metervar
 		| otherwise = do
 			f <- fromRepo $ gitAnnexTmpObjectLocation (transferKey t)
-			liftIO $ catchDefaultIO 0 $
-				fromIntegral . fileSize <$> getFileStatus f
+			liftIO $ catchDefaultIO 0 $ getFileSize f
 
 type RetryDecider = TransferInfo -> TransferInfo -> Bool
 

Assistant/Repair.hs

@@ -140,8 +140,7 @@ repairStaleGitLocks r = do
 repairStaleLocks :: [FilePath] -> Assistant ()
 repairStaleLocks lockfiles = go =<< getsizes
   where
-	getsize lf = catchMaybeIO $ 
-		(\s -> (lf, fileSize s)) <$> getFileStatus lf
+	getsize lf = catchMaybeIO $ (\s -> (lf, s)) <$> getFileSize lf
 	getsizes = liftIO $ catMaybes <$> mapM getsize lockfiles
 	go [] = return ()
 	go l = ifM (liftIO $ null <$> Lsof.query ("--" : map fst l))

Assistant/Threads/SanityChecker.hs

@@ -225,7 +225,7 @@ checkLogSize :: Int -> Assistant ()
 checkLogSize n = do
 	f <- liftAnnex $ fromRepo gitAnnexLogFile
 	logs <- liftIO $ listLogs f
-	totalsize <- liftIO $ sum <$> mapM filesize logs
+	totalsize <- liftIO $ sum <$> mapM getFileSize logs
 	when (totalsize > 2 * oneMegabyte) $ do
 		notice ["Rotated logs due to size:", show totalsize]
 		liftIO $ openLog f >>= handleToFd >>= redirLog
@@ -237,9 +237,7 @@ checkLogSize n = do
 						checkLogSize (n + 1)
 				_ -> noop
   where
-	filesize f = fromIntegral . fileSize <$> liftIO (getFileStatus f)
-
-	oneMegabyte :: Int
+	oneMegabyte :: Integer
 	oneMegabyte = 1000000
 #endif
 

Assistant/Threads/TransferPoller.hs

@@ -36,8 +36,7 @@ transferPollerThread = namedThread "TransferPoller" $ do
 		 - temp file being used for the transfer. -}
 		| transferDirection t == Download = do
 			let f = gitAnnexTmpObjectLocation (transferKey t) g
-			sz <- liftIO $ catchMaybeIO $
-				fromIntegral . fileSize <$> getFileStatus f
+			sz <- liftIO $ catchMaybeIO $ getFileSize f
 			newsize t info sz
 		{- Uploads don't need to be polled for when the TransferWatcher
 		 - thread can track file modifications. -}

Backend/Hash.hs

@@ -68,8 +68,7 @@ hashNameE hash = hashName hash ++ "E"
 keyValue :: Hash -> KeySource -> Annex (Maybe Key)
 keyValue hash source = do
 	let file = contentLocation source
-	stat <- liftIO $ getFileStatus file
-	let filesize = fromIntegral $ fileSize stat
+	filesize <- liftIO $ getFileSize file
 	s <- hashFile hash file filesize
 	return $ Just $ stubKey
 		{ keyName = s
@@ -103,7 +102,7 @@ checkKeyChecksum hash key file = do
 	mstat <- liftIO $ catchMaybeIO $ getFileStatus file
 	case (mstat, fast) of
 		(Just stat, False) -> do
-			let filesize = fromIntegral $ fileSize stat
+			filesize <- liftIO $ getFileSize' file stat
 			showSideAction "checksum"
 			check <$> hashFile hash file filesize
 		_ -> return True

Backend/WORM.hs

@@ -32,11 +32,13 @@ backend = Backend
  -}
 keyValue :: KeySource -> Annex (Maybe Key)
 keyValue source = do
-	stat <- liftIO $ getFileStatus $ contentLocation source
+	let f = contentLocation source
+	stat <- liftIO $ getFileStatus f
+	sz <- liftIO $ getFileSize' f stat
 	relf <- getTopFilePath <$> inRepo (toTopFilePath $ keyFilename source)
 	return $ Just $ stubKey
 		{ keyName = genKeyName relf
 		, keyBackendName = name backend
-		, keySize = Just $ fromIntegral $ fileSize stat
+		, keySize = Just sz
 		, keyMtime = Just $ modificationTime stat
 		}

Command/Fsck.hs

@@ -303,8 +303,7 @@ checkKeySizeOr :: (Key -> Annex String) -> Key -> FilePath -> Annex Bool
 checkKeySizeOr bad key file = case Types.Key.keySize key of
 	Nothing -> return True
 	Just size -> do
-		size' <- fromIntegral . fileSize
-			<$> liftIO (getFileStatus file)
+		size' <- liftIO $ getFileSize file
 		comparesizes size size'
   where
 	comparesizes a b = do

Command/Info.hs

@@ -490,8 +490,7 @@ staleSize label dirspec = go =<< lift (dirKeys dirspec)
 	keysizes keys = do
 		dir <- lift $ fromRepo dirspec
 		liftIO $ forM keys $ \k -> catchDefaultIO 0 $
-			fromIntegral . fileSize 
-				<$> getFileStatus (dir </> keyFile k)
+			getFileSize (dir </> keyFile k)
 
 aside :: String -> String
 aside s = " (" ++ s ++ ")"

Command/RecvKey.hs

@@ -62,8 +62,7 @@ start key = fieldTransfer Download key $ \_p ->
 		oksize <- case Types.Key.keySize key of
 		        Nothing -> return True
 		        Just size -> do
-				size' <- fromIntegral . fileSize
-					<$> liftIO (getFileStatus tmp)
+				size' <- liftIO $ getFileSize tmp
 				return $ size == size'
 		if oksize
 			then case Backend.maybeLookupBackendName (Types.Key.keyBackendName key) of

Common.hs

@@ -30,7 +30,8 @@ import Utility.Monad as X
 import Utility.Data as X
 import Utility.Applicative as X
 import Utility.FileSystemEncoding as X
-import Utility.PosixFiles as X
+import Utility.PosixFiles as X hiding (fileSize)
+import Utility.FileSize as X
 import Utility.Network as X
 
 import Utility.PartialPrelude as X

Limit.hs

@@ -239,9 +239,7 @@ limitSize vs s = case readSize dataUnits s of
 	checkkey sz key = return $ keySize key `vs` Just sz
 	check _ sz (Just key) = checkkey sz key
 	check fi sz Nothing = do
-		filesize <- liftIO $ catchMaybeIO $
-			fromIntegral . fileSize
-				<$> getFileStatus (relFile fi)
+		filesize <- liftIO $ catchMaybeIO $ getFileSize (relFile fi)
 		return $ filesize `vs` Just sz
 
 addMetaData :: String -> Annex ()

Remote/Git.hs

@@ -563,9 +563,7 @@ rsyncOrCopyFile rsyncparams src dest p =
 		(const $ copyFileExternal CopyTimeStamps src dest)
 	watchfilesize oldsz = do
 		threadDelay 500000 -- 0.5 seconds
-		v <- catchMaybeIO $
-			toBytesProcessed . fileSize
-				<$> getFileStatus dest
+		v <- catchMaybeIO $ toBytesProcessed <$> getFileSize dest
 		case v of
 			Just sz
 				| sz /= oldsz -> do

Remote/Helper/Chunked.hs

@@ -244,8 +244,7 @@ retrieveChunks retriever u chunkconfig encryptor basek dest basep sink
 	| otherwise = go =<< chunkKeys u chunkconfig basek
   where
 	go ls = do
-		currsize <- liftIO $ catchMaybeIO $
-			toInteger . fileSize <$> getFileStatus dest
+		currsize <- liftIO $ catchMaybeIO $ getFileSize dest
 		let ls' = maybe ls (setupResume ls) currsize
 		if any null ls'
 			then return True -- dest is already complete

Remote/Helper/Http.hs

@@ -32,7 +32,7 @@ httpStorer a = fileStorer $ \k f m -> a k =<< liftIO (httpBodyStorer f m)
 -- the meter as it's sent.
 httpBodyStorer :: FilePath -> MeterUpdate -> IO RequestBody
 httpBodyStorer src m = do
-	size <- fromIntegral . fileSize <$> getFileStatus src :: IO Integer
+	size <- getFileSize src
 	let streamer sink = withMeteredFile src m $ \b -> byteStringPopper b sink
 	return $ RequestBodyStream (fromInteger size) streamer
 

Remote/S3.hs

@@ -159,7 +159,7 @@ store :: Remote -> S3Handle -> Storer
 store r h = fileStorer $ \k f p -> do
 	case partSize (hinfo h) of
 		Just partsz | partsz > 0 -> do
-			fsz <- fromIntegral . fileSize <$> liftIO (getFileStatus f)
+			fsz <- liftIO $ getFileSize f
 			if fsz > partsz
 				then multipartupload fsz partsz k f p
 				else singlepartupload k f p

Utility/FileSize.hs

@@ -0,0 +1,33 @@
+{- File size.
+ -
+ - License: BSD-2-clause
+ -}
+
+{-# LANGUAGE CPP #-}
+
+module Utility.FileSize where
+
+import System.PosixCompat.Files
+import Control.Exception (bracket)
+import System.IO
+
+{- Gets the size of a file.
+ -
+ - This is better than using fileSize, because on Windows that returns a
+ - FileOffset which maxes out at 2 gb.
+ - See https://github.com/jystic/unix-compat/issues/16
+ -}
+getFileSize :: FilePath -> IO Integer
+#ifndef mingw32_HOST_OS
+getFileSize f = fromIntegral . fileSize <$> getFileStatus f
+#else
+getFileSize f = bracket (openFile f ReadMode) hClose hFileSize
+#endif
+
+{- Gets the size of the file, when its FileStatus is already known. -}
+getFileSize' :: FilePath -> FileStatus -> IO Integer
+#ifndef mingw32_HOST_OS
+getFileSize' _ s = return $ fromIntegral $ fileSize s
+#else
+getFileSize' f _ = getFileSize f
+#endif

Utility/InodeCache.hs

@@ -40,6 +40,9 @@ module Utility.InodeCache (
 import Common
 import System.PosixCompat.Types
 import Utility.QuickCheck
+-- While fileSize overflows and wraps at 2gb on Windows,
+-- it's ok for purposes of comparison.
+import System.PosixCompat.Files (fileSize)
 
 #ifdef mingw32_HOST_OS
 import Data.Word (Word64)

Utility/Url.hs

@@ -102,9 +102,12 @@ exists url uo = case parseURIRelaxed url of
 		-- so fall back to reading files and using curl.
 		Nothing
 			| uriScheme u == "file:" -> do
-				s <- catchMaybeIO $ getFileStatus (unEscapeString $ uriPath u)
+				let f = unEscapeString (uriPath u)
+				s <- catchMaybeIO $ getFileStatus f
 				case s of
-					Just stat -> return (True, Just $ fromIntegral $ fileSize stat)
+					Just stat -> do
+						sz <- getFileSize' f stat
+						return (True, Just sz)
 					Nothing -> dne
 			| Build.SysConfig.curl -> do
 				output <- catchDefaultIO "" $

debian/changelog

@@ -13,6 +13,9 @@ git-annex (5.20150114) UNRELEASED; urgency=medium
   * Fix wording of message displayed when unable to get a file that
     is available in untrusted repositories.
   * Windows: Fix running of the pre-commit-annex hook.
+  * Avoid using fileSize which maxes out at just 2 gb on Windows.
+    Instead, use hFileSize, which doesn't have a bounded size.
+    Fixes support for files > 2 gb on Windows.
 
  -- Joey Hess <id@joeyh.name>  Tue, 13 Jan 2015 17:03:39 -0400
 

doc/bugs/Direct_mode_sync_fails_to_transfer_a_10GB_file.mdwn

@@ -56,3 +56,5 @@ git-annex: sync: 1 failed
 
 # End of transcript or log.
 """]]
+
+> [[fixed|done]] --[[Joey]]

doc/bugs/Direct_mode_sync_fails_to_transfer_a_10GB_file/comment_1_cb9e9dada7baf4e48725a9483b3b448a._comment

@@ -0,0 +1,25 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2015-01-20T19:41:44Z"
+ content="""
+In my own test, I made a 10 gb file, and the key git-annex came up with had
+a size of -2147483648 which is clearly screwed up.. But that's what
+getFileStatus reports the size as. This was in an 32 bit XP VM.
+
+Hmm, unix-compat's getFileStatus calls getFileSize, which yields a
+FileOffset. The maxBound of that on linux is a nice large
+9223372036854775807, but on Windows, it appears to be 2147483647.
+
+Compare with using hFileSize, which yields an Integer. So,
+getFileSize and fileSize are unsafe on Windows due to FileOffset being so
+small on Windows.
+
+I have now corrected all places in git-annex that used the unsafe fileSize.
+It will behave correctly on Windows now.
+
+However, if you still have the repo with the big file, it's key still has
+the wrong size. To fix, you can "git annex unannex" the file, and then "git
+annex add" it back, after upgrading to the current daily build, or the next
+release of git-annex.
+"""]]