fix http proxying for a local git remote with a relative path

git-annex-shell expects an absolute path

Remote/Helper/Ssh.hs

@@ -44,12 +44,13 @@ toRepo cs r gc remotecmd = do
 git_annex_shell :: ConsumeStdin -> Git.Repo -> String -> [CommandParam] -> [(Field, String)] -> Annex (Maybe (FilePath, [CommandParam]))
 git_annex_shell cs r command params fields
 	| not $ Git.repoIsUrl r = do
-		shellopts <- getshellopts
+		dir <- liftIO $ absPath (Git.repoPath r)
+		shellopts <- getshellopts dir
 		return $ Just (shellcmd, shellopts ++ fieldopts)
 	| Git.repoIsSsh r = do
 		gc <- Annex.getRemoteGitConfig r
 		u <- getRepoUUID r
-		shellopts <- getshellopts
+		shellopts <- getshellopts (Git.repoPath r)
 		let sshcmd = unwords $
 			fromMaybe shellcmd (remoteAnnexShell gc)
 				: map shellEscape (toCommand shellopts) ++
@@ -58,9 +59,8 @@ git_annex_shell cs r command params fields
 		Just <$> toRepo cs r gc sshcmd
 	| otherwise = return Nothing
   where
-	dir = Git.repoPath r
 	shellcmd = "git-annex-shell"
-	getshellopts = do
+	getshellopts dir = do
 		debugenabled <- Annex.getRead Annex.debugenabled
 		debugselector <- Annex.getRead Annex.debugselector
 		let params' = case (debugenabled, debugselector) of

doc/todo/git-annex_proxies.mdwn

@@ -28,8 +28,6 @@ Planned schedule of work:
 
 ## work notes
 
-* http proxying for a local git remote seems to probably not work
-
 * An interrupted `git-annex copy --to` a cluster via the http server,
   when repeated, fails. The http server outputs "transfer already in
   progress, or unable to take transfer lock". Apparently a second
@@ -117,6 +115,14 @@ Planned schedule of work:
 
 * Optimise proxy speed. See design for ideas.
 
+* Speed: A proxy to a local git repository spawns git-annex-shell 
+  to communicate with it. It would be more efficient to operate
+  directly on the Remote. Especially when transferring content to/from it.
+  But: When a cluster has several nodes that are local git repositories,
+  and is sending data to all of them, this would need an alternate
+  interface than `storeKey`, which supports streaming, of chunks
+  of a ByteString.
+
 * Use `sendfile()` to avoid data copying overhead when
   `receiveBytes` is being fed right into `sendBytes`.
   Library to use: