wip RawFilePath

Goal is to make git-annex faster by using ByteString for all the
worktree traversal. For now, this is focusing on Command.Find,
in order to benchmark how much it helps. (All other commands are
temporarily disabled)

Currently in a very bad unbuildable in-between state.

Git/Repair.hs

@@ -284,7 +284,7 @@ findUncorruptedCommit missing goodcommits branch r = do
 				, Param "--format=%H"
 				, Param (fromRef branch)
 				] r
-			let branchshas = catMaybes $ map extractSha ls
+			let branchshas = catMaybes $ map (extractSha . decodeBS) ls
 			reflogshas <- RefLog.get branch r
 			-- XXX Could try a bit harder here, and look
 			-- for uncorrupted old commits in branches in the
@@ -313,7 +313,7 @@ verifyCommit missing goodcommits commit r
 			, Param "--format=%H %T"
 			, Param (fromRef commit)
 			] r
-		let committrees = map parse ls
+		let committrees = map (parse . decodeBS) ls
 		if any isNothing committrees || null committrees
 			then do
 				void cleanup