remote: handle pushremote config in any order

The remote we push can be defined either by
remote.pushdefault or by branch.*.pushremote for the current
branch. The order in which they appear in the config file
should not matter to precedence (which should be to prefer
the branch-specific config).

The current code parses the config linearly and uses a
single string to store both values, overwriting any
previous value. Thus, config like:

  [branch "master"]
  pushremote = foo
  [remote]
  pushdefault = bar

erroneously ends up pushing to "bar" from the master branch.

We can fix this by storing both values and resolving the
correct value after all config is read.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

remote.c

@@ -49,6 +49,7 @@ static int branches_nr;
 
 static struct branch *current_branch;
 static const char *default_remote_name;
+static const char *branch_pushremote_name;
 static const char *pushremote_name;
 static int explicit_default_remote_name;
 
@@ -352,7 +353,7 @@ static int handle_config(const char *key, const char *value, void *cb)
 			}
 		} else if (!strcmp(subkey, ".pushremote")) {
 			if (branch == current_branch)
-				if (git_config_string(&pushremote_name, key, value))
+				if (git_config_string(&branch_pushremote_name, key, value))
 					return -1;
 		} else if (!strcmp(subkey, ".merge")) {
 			if (!value)
@@ -492,6 +493,10 @@ static void read_config(void)
 			make_branch(head_ref + strlen("refs/heads/"), 0);
 	}
 	git_config(handle_config, NULL);
+	if (branch_pushremote_name) {
+		free((char *)pushremote_name);
+		pushremote_name = branch_pushremote_name;
+	}
 	alias_all_urls();
 }
 

t/t5516-fetch-push.sh

@@ -536,6 +536,19 @@ test_expect_success 'push with config branch.*.pushremote' '
 	check_push_result down_repo $the_commit heads/master
 '
 
+test_expect_success 'branch.*.pushremote config order is irrelevant' '
+	mk_test one_repo heads/master &&
+	mk_test two_repo heads/master &&
+	test_config remote.one.url one_repo &&
+	test_config remote.two.url two_repo &&
+	test_config branch.master.pushremote two_repo &&
+	test_config remote.pushdefault one_repo &&
+	test_config push.default matching &&
+	git push &&
+	check_push_result one_repo $the_first_commit heads/master &&
+	check_push_result two_repo $the_commit heads/master
+'
+
 test_expect_success 'push with dry-run' '
 
 	mk_test testrepo heads/master &&