Support filenames that start with a dash; when such a file is passed to a utility it will be escaped to avoid it being interpreted as an option.

Backend/SHA1.hs

@@ -20,6 +20,7 @@ import qualified Annex
 import Locations
 import Content
 import Types
+import Utility
 
 backend :: Backend Annex
 backend = Backend.File.backend {
@@ -31,7 +32,7 @@ backend = Backend.File.backend {
 sha1 :: FilePath -> Annex String
 sha1 file = do
 	showNote "checksum..."
-	liftIO $ pOpen ReadFromPipe "sha1sum" [file] $ \h -> do
+	liftIO $ pOpen ReadFromPipe "sha1sum" [utilityEscape file] $ \h -> do
 		line <- hGetLine h
 		let bits = split " " line
 		if null bits

Backend/URL.hs

@@ -51,6 +51,6 @@ downloadUrl :: Key -> FilePath -> Annex Bool
 downloadUrl key file = do
 	showNote "downloading"
 	showProgress -- make way for curl progress bar
-	liftIO $ boolSystem "curl" ["-#", "-o", file, url]
+	liftIO $ boolSystem "curl" ["-#", "-o", utilityEscape file, url]
 	where
 		url = join ":" $ drop 1 $ split ":" $ show key 

Command/SetKey.hs

@@ -35,7 +35,8 @@ perform file = do
 	-- rather than simply calling moveToObjectDir
 	ok <- getViaTmp key $ \dest -> do
 		if dest /= file
-			then liftIO $ boolSystem "mv" [file, dest]
+			then liftIO $
+				boolSystem "mv" [utilityEscape file, utilityEscape dest]
 			else return True
 	if ok
 		then return $ Just $ cleanup

CopyFile.hs

@@ -23,9 +23,11 @@ copyFile src dest = do
 	boolSystem "cp" opts
 	where
 		opts = if SysConfig.cp_reflink_auto
-			then ["--reflink=auto", src, dest]
+			then ["--reflink=auto", src', dest']
 			else if SysConfig.cp_a
-				then ["-a", src, dest]
+				then ["-a", src', dest']
 				else if SysConfig.cp_p
-					then ["-p", src, dest]
-					else [src, dest]
+					then ["-p", src', dest']
+					else [src', dest']
+		src' = utilityEscape src
+		dest' = utilityEscape dest

Remotes.hs

@@ -282,7 +282,7 @@ rsyncParams r sending key file = do
 		-- inplace makes rsync resume partial files
 		options = ["-p", "--progress", "--inplace"]
 		-- the rsync shell parameter controls where rsync
-		-- does, so the source/dest parameter can be a dummy value,
+		-- goes, so the source/dest parameter can be a dummy value,
 		-- that just enables remote rsync mode.
 		dummy = ":"
 

RsyncFile.hs

@@ -24,11 +24,12 @@ rsyncShell command = ["-e", unwords $ map escape command]
 
 {- Runs rsync in server mode to send a file, and exits. -}
 rsyncServerSend :: FilePath -> IO ()
-rsyncServerSend file = rsyncExec $ rsyncServerParams ++ ["--sender", file]
+rsyncServerSend file = rsyncExec $
+	rsyncServerParams ++ ["--sender", utilityEscape file]
 
 {- Runs rsync in server mode to receive a file. -}
 rsyncServerReceive :: FilePath -> IO Bool
-rsyncServerReceive file = rsync $ rsyncServerParams ++ [file]
+rsyncServerReceive file = rsync $ rsyncServerParams ++ [utilityEscape file]
 
 rsyncServerParams :: [String]
 rsyncServerParams =

Utility.hs

@@ -15,6 +15,7 @@ module Utility (
 	boolSystem,
 	shellEscape,
 	shellUnEscape,
+	utilityEscape,
 	unsetFileMode,
 	readMaybe,
 	safeWriteFile,
@@ -179,6 +180,13 @@ shellUnEscape s = word:(shellUnEscape rest)
 			| c == q = findword w cs
 			| otherwise = inquote q (w++[c]) cs
 
+{- Ensures that a filename is safe to pass to a utility program. In particular
+ - since utilities tend to interpret things starting with a dash as
+ - an option, relative filenames starting with a dash are escaped. -}
+utilityEscape :: FilePath -> FilePath
+utilityEscape ('-':s) = "./-" ++ s
+utilityEscape s = s
+
 {- For quickcheck. -}
 prop_idempotent_shellEscape :: String -> Bool
 prop_idempotent_shellEscape s = [s] == (shellUnEscape $ shellEscape s)

debian/changelog

@@ -5,6 +5,9 @@ git-annex (0.22) UNRELEASED; urgency=low
     for his help eliminating the infestation... for now.)
   * Make test suite not rely on a working cp -pr.
     (The Unix wars are still ON!)
+  * Support filenames that start with a dash; when such a file is passed
+    to a utility it will be escaped to avoid it being interpreted as an
+    option.
 
  -- Joey Hess <joeyh@debian.org>  Sun, 13 Feb 2011 00:48:02 -0400
 

doc/bugs/error_with_file_names_starting_with_dash.mdwn

@@ -10,3 +10,6 @@ add -wut-a-directory-name-/file1 (checksum...) sha1sum: invalid option -- 'u'
 
   git-annex: <file descriptor: 15>: hGetLine: end of file
 """]]
+
+> This is fixed in git, at least I think I've found all cases where
+> filenames are passed to programs and escaped them. --[[Joey]] [[done]]