Direct mode: Fix support for adding a modified file.

Adding a file that is already annexed, but has been modified, was broken in
direct mode.

This fix makes the new content be added. It does have the problem that
re-running `git annex add` will checksum and re-add the content repeatedly,
until it's committed. This happens because the key associated with the file
does not change until the new one gets committed, so it keeps thinking the
file has changed.

Command/Add.hs

@@ -35,14 +35,14 @@ def = [notBareRepo $ command "add" paramPaths seek "add files to annex"]
 seek :: [CommandSeek]
 seek =
 	[ withFilesNotInGit start
-	, whenNotDirect $ withFilesUnlocked start
+	, withFilesUnlocked start
 	]
 
 {- The add subcommand annexes a file, generating a key for it using a
  - backend, and then moving it into the annex directory and setting up
  - the symlink pointing to its content. -}
 start :: FilePath -> CommandStart
-start file = ifAnnexed file fixup add
+start file = ifAnnexed file addpresent add
   where
 	add = do
 		s <- liftIO $ getSymbolicLinkStatus file
@@ -51,7 +51,11 @@ start file = ifAnnexed file fixup add
 			else do
 				showStart "add" file
 				next $ perform file
-	fixup (key, _) = do
+	addpresent (key, _) = ifM isDirect
+		( ifM (goodContent key file) ( stop , add )
+		, fixup key
+		)
+	fixup key = do
 		-- fixup from an interrupted add; the symlink
 		-- is present but not yet added to git
 		showStart "add" file

debian/changelog

@@ -10,6 +10,7 @@ git-annex (3.20130217) UNRELEASED; urgency=low
   * Android: Support ssh connection caching.
   * Direct mode: Support filesystems like FAT which can change their inodes
     each time they are mounted.
+  * Direct mode: Fix support for adding a modified file.
 
  -- Joey Hess <joeyh@debian.org>  Sun, 17 Feb 2013 16:42:16 -0400