fsck: When checksumming a file fails due to a hardware fault, the file is now moved to the bad directory, and the fsck proceeds. Before, the fsck immediately failed.

Backend/Hash.hs

@@ -95,16 +95,17 @@ selectExtension f
 
 {- A key's checksum is checked during fsck. -}
 checkKeyChecksum :: Hash -> Key -> FilePath -> Annex Bool
-checkKeyChecksum hash key file = do
+checkKeyChecksum hash key file = go `catchHardwareFault` hwfault
-	fast <- Annex.getState Annex.fast
-	mstat <- liftIO $ catchMaybeIO $ getFileStatus file
-	case (mstat, fast) of
-		(Just stat, False) -> do
-			filesize <- liftIO $ getFileSize' file stat
-			showSideAction "checksum"
-			check <$> hashFile hash file filesize
-		_ -> return True
   where
+	go = do
+		fast <- Annex.getState Annex.fast
+		mstat <- liftIO $ catchMaybeIO $ getFileStatus file
+		case (mstat, fast) of
+			(Just stat, False) -> do
+				filesize <- liftIO $ getFileSize' file stat
+				showSideAction "checksum"
+				check <$> hashFile hash file filesize
+			_ -> return True
 	expected = keyHash key
 	check s
 		| s == expected = True
@@ -114,6 +115,10 @@ checkKeyChecksum hash key file = do
 		| '\\' : s == expected = True
 		| otherwise = False
 
+	hwfault e = do
+		warning $ "hardware fault: " ++ show e
+		return False
+
 keyHash :: Key -> String
 keyHash key = dropExtensions (keyName key)
 

Utility/ExternalSHA.hs

@@ -21,8 +21,6 @@ import Utility.Exception
 import Data.List
 import Data.Char
 import System.IO
-import Control.Applicative
-import Prelude
 
 externalSHA :: String -> Int -> FilePath -> IO (Either String String)
 externalSHA command shasize file = do

debian/changelog

@@ -8,6 +8,9 @@ git-annex (5.20150523) UNRELEASED; urgency=medium
   * Revert removal dependency on obsolete hamlet package, since the
     autobuilders are not ready for this change yet and it prevented them
     from building the webapp. Reopens: #786659
+  * fsck: When checksumming a file fails due to a hardware fault,
+    the file is now moved to the bad directory, and the fsck proceeds.
+    Before, the fsck immediately failed.
 
  -- Joey Hess <id@joeyh.name>  Fri, 22 May 2015 22:23:32 -0400
 

doc/bugs/git_annex_fsck_on_btrfs_devices.mdwn

@@ -12,3 +12,7 @@ git-annex: sha1sum parse error
 ### What version of git-annex are you using? On what operating system?
 git-annex 5.20150508
 linux 4.0.4
+
+> [[fixed|done]]; IO errors are now detected and the file moved to bad/;
+> the fsck also continues past that failure now, so if a disk has
+> a lot of damanged files, it will find them all. --[[Joey]]