proxied remotes working on client side

Got the right git config settings inherited now.

Note that the url config is not passed on to git, so it won't be able
to access the proxied remote. That would need some kind of
git-remote-annex but for proxied remotes anyway. Unsure yet if that will
be needed.

Remote/Git.hs

@@ -1,6 +1,6 @@
 {- Standard git remotes.
  -
- - Copyright 2011-2023 Joey Hess <id@joeyh.name>
+ - Copyright 2011-2024 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU AGPL version 3 or higher.
  -}
@@ -789,51 +789,63 @@ listProxied proxies rs = concat <$> mapM go rs
 		u <- getRepoUUID r
 		gc <- Annex.getRemoteGitConfig r
 		let cu = fromMaybe u $ remoteAnnexConfigUUID gc
-		pure $ if not (canproxy gc r) || cu ==NoUUID
-			then []
+		if not (canproxy gc r) || cu ==NoUUID
+			then pure []
 			else case M.lookup cu proxies of
-				Nothing -> []
-				Just s -> mapMaybe (mkproxied g r) (S.toList s)
+				Nothing -> pure []
+				Just s -> catMaybes
+					<$> mapM (mkproxied g r) (S.toList s)
 	
-	proxyremotename r p = do
+	proxiedremotename r p = do
 		n <- Git.remoteName r
 		pure $ n ++ "-" ++ proxyRemoteName p
 
-	mkproxied g r p = mkproxied' g r p =<< proxyremotename r p
+	mkproxied g r p = case proxiedremotename r p of
+		Nothing -> pure Nothing
+		Just proxyname -> mkproxied' g r p proxyname
 	
+	-- The proxied remote is constructed by renaming the proxy remote,
+	-- and setting the proxied remote's inherited configs, url and
+	-- uuid in Annex state.
 	mkproxied' g r p proxyname
-		| any isconfig (M.keys (Git.config g)) = Nothing
-		-- The proxied remote is constructed by renaming the
-		-- proxy remote, changing its uuid, and inheriting some
-		-- of its config. The url in particular stays the same.
-		| otherwise = Just $ renamedr
-			{ Git.config = M.map Prelude.head c
-			, Git.fullconfig = c
-			}
+		| any isconfig (M.keys (Git.config g)) = pure Nothing
+		| otherwise = do
+			-- Not using addGitConfigOverride for inherited
+			-- configs and the uuid, because child git processes
+			-- do not need them to be provided with -c.
+			Annex.adjustGitRepo (pure . configadjuster)
+			return $ Just $ renamedr
 	  where
 		renamedr = r { Git.remoteName = Just proxyname }
 		
-		c = M.insert
+		configadjuster r' = 
+			let c = adduuid $ inheritconfigs $ Git.fullconfig r'
+			in r'
+				{ Git.config = M.map Prelude.head c
+				, Git.fullconfig = c
+				}
+
+		adduuid = M.insert
 			(configRepoUUID renamedr)
 			[Git.ConfigValue $ fromUUID $ proxyRemoteUUID p]
-			inheritedconfig
 
-		inheritedconfig = M.fromList $
-			mapMaybe inheritconfig proxyInheritedFields
+		inheritconfigs c = foldl' inheritconfig c proxyInheritedFields
 		
-		inheritconfig k = do
-			let rk = remoteAnnexConfig r k
-			v <- M.lookup rk (Git.fullconfig r)
-			pure $ (rk, v)
+		inheritconfig c k = case (M.lookup dest c, M.lookup src c) of
+			(Nothing, Just v) -> M.insert dest v c
+			_ -> c
+		  where
+			src = remoteAnnexConfig r k
+			dest = remoteAnnexConfig renamedr k
 		
 		-- When the git config has anything set for a remote,
 		-- avoid making a proxied remote with the same name.
 		-- It is possible to set git configs of proxies, but it
 		-- needs both the url and uuid config to be manually set.
 		isconfig (Git.ConfigKey configkey) = 
-			configprefix `B.isPrefixOf` configkey
+			proxyconfigprefix `B.isPrefixOf` configkey
 		  where 
-			Git.ConfigKey configprefix = remoteConfig proxyname mempty
+			Git.ConfigKey proxyconfigprefix = remoteConfig proxyname mempty
 
 	-- Git remotes that are gcrypt or git-lfs special remotes cannot
 	-- proxy. Proxing is also not yet supported for remotes using P2P