[PATCH 7/7] remote rename: gently handle remote.pushDefault config

[Bert Wesarg <bert.wesarg@googlemail.com>]

When renaming a remote with

    git remote rename X Y

Git already renames any branch.<name>.remote and branch.<name>.pushRemote
values from X to Y.

However remote.pushDefault needs a more gentle approach, as this may be
set in a non-repo configuration file. In such a case only a warning is
printed, such as:

warning: The global configuration remote.pushDefault in:
	$HOME/.gitconfig:35
now names the non-existent remote 'origin'

It is changed to remote.pushDefault = Y when set in a repo configuration
though.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
---

Matthew, you are in Cc because of your current work 'config: allow user to
know scope of config options'. I think I'm correct to assuming an ordering
of the enum config_scope.

Cc: Junio C Hamano <gitster@pobox.com>
Cc: Johannes Schindelin <johannes.schindelin@gmx.de>
Cc: Matthew Rogers <mattr94@gmail.com>
---
 builtin/remote.c  | 43 ++++++++++++++++++++++++++++++++++++++++
 t/t5505-remote.sh | 50 ++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 92 insertions(+), 1 deletion(-)

diff --git a/builtin/remote.c b/builtin/remote.c
index 0cb930fe00..52172e523a 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -611,6 +611,29 @@ static int migrate_file(struct remote *remote)
 	return 0;
 }
 
+struct push_default_info
+{
+	struct rename_info *rename;
+	enum config_scope scope;
+	struct strbuf* origin;
+	int linenr;
+};
+
+static int config_read_push_default(const char *key, const char *value,
+	void *cb)
+{
+	struct push_default_info* info = cb;
+	if (strcmp(key, "remote.pushdefault") || strcmp(value, info->rename->old_name))
+		return 0;
+
+	info->scope = current_config_scope();
+	strbuf_reset(info->origin);
+	strbuf_addstr(info->origin, current_config_name());
+	info->linenr = current_config_line();
+
+	return 0;
+}
+
 static int mv(int argc, const char **argv)
 {
 	struct option options[] = {
@@ -746,6 +769,26 @@ static int mv(int argc, const char **argv)
 			die(_("creating '%s' failed"), buf.buf);
 	}
 	string_list_clear(&remote_branches, 1);
+
+	struct push_default_info push_default;
+	push_default.rename = &rename;
+	push_default.scope = CONFIG_SCOPE_UNKNOWN;
+	push_default.origin = &buf;
+	git_config(config_read_push_default, &push_default);
+	if (push_default.scope >= CONFIG_SCOPE_CMDLINE)
+		; /* pass */
+	else if (push_default.scope >= CONFIG_SCOPE_REPO) {
+		git_config_set("remote.pushDefault", rename.new_name);
+	} else if (push_default.scope >= CONFIG_SCOPE_SYSTEM) {
+		/* warn */
+		warning(_("The %s configuration remote.pushDefault in:\n"
+			  "\t%s:%d\n"
+			  "now names the non-existent remote '%s'"),
+			config_scope_name(push_default.scope),
+			push_default.origin->buf, push_default.linenr,
+			rename.old_name);
+	}
+
 	return 0;
 }
 
diff --git a/t/t5505-remote.sh b/t/t5505-remote.sh
index 59a1681636..3b84c7bf9b 100755
--- a/t/t5505-remote.sh
+++ b/t/t5505-remote.sh
@@ -737,6 +737,7 @@ test_expect_success 'rename a remote' '
 	git clone one four &&
 	(
 		cd four &&
+		test_config_global remote.pushDefault origin &&
 		git config branch.master.pushRemote origin &&
 		git remote rename origin upstream &&
 		test -z "$(git for-each-ref refs/remotes/origin)" &&
@@ -744,7 +745,54 @@ test_expect_success 'rename a remote' '
 		test "$(git rev-parse upstream/master)" = "$(git rev-parse master)" &&
 		test "$(git config remote.upstream.fetch)" = "+refs/heads/*:refs/remotes/upstream/*" &&
 		test "$(git config branch.master.remote)" = "upstream" &&
-		test "$(git config branch.master.pushRemote)" = "upstream"
+		test "$(git config branch.master.pushRemote)" = "upstream" &&
+		test "$(git config --global remote.pushDefault)" = "origin"
+	)
+'
+
+test_expect_success 'rename a remote renames repo remote.pushDefault' '
+	git clone one four.1 &&
+	(
+		cd four.1 &&
+		git config remote.pushDefault origin &&
+		git remote rename origin upstream &&
+		test "$(git config remote.pushDefault)" = "upstream"
+	)
+'
+
+test_expect_success 'rename a remote keeps global remote.pushDefault' '
+	git clone one four.2 &&
+	(
+		cd four.2 &&
+		test_config_global remote.pushDefault origin &&
+		git config remote.pushDefault other &&
+		git remote rename origin upstream &&
+		test "$(git config --global remote.pushDefault)" = "origin" &&
+		test "$(git config remote.pushDefault)" = "other"
+	)
+'
+
+test_expect_success 'rename a remote renames repo remote.pushDefault but ignores global' '
+	git clone one four.3 &&
+	(
+		cd four.3 &&
+		test_config_global remote.pushDefault other &&
+		git config remote.pushDefault origin &&
+		git remote rename origin upstream &&
+		test "$(git config --global remote.pushDefault)" = "other" &&
+		test "$(git config remote.pushDefault)" = "upstream"
+	)
+'
+
+test_expect_success 'rename a remote renames repo remote.pushDefault but keeps global' '
+	git clone one four.4 &&
+	(
+		cd four.4 &&
+		test_config_global remote.pushDefault origin &&
+		git config remote.pushDefault origin &&
+		git remote rename origin upstream &&
+		test "$(git config --global remote.pushDefault)" = "origin" &&
+		test "$(git config remote.pushDefault)" = "upstream"
 	)
 '
 
-- 
2.24.1.497.g9abd7b20b4.dirty