builtin/remote.c: teach `-v` to list filters for promisor remotes

`git remote -v` (`--verbose`) lists down the names of remotes along with
their URLs. It would be beneficial for users to also specify the filter
types for promisor remotes. Something like this -

	origin	remote-url (fetch) [blob:none]
	origin	remote-url (push)

Teach `git remote -v` to also specify the filters for promisor remotes.

Closes: https://github.com/gitgitgadget/git/issues/1211
Signed-off-by: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-remote.txt

@@ -35,6 +35,8 @@ OPTIONS
 -v::
 --verbose::
 	Be a little more verbose and show remote url after name.
+	For promisor remotes, also show which filter (`blob:none` etc.)
+	are configured.
 	NOTE: This must be placed between `remote` and subcommand.
 
 

builtin/remote.c

@@ -1185,14 +1185,22 @@ static int show_push_info_item(struct string_list_item *item, void *cb_data)
 static int get_one_entry(struct remote *remote, void *priv)
 {
 	struct string_list *list = priv;
-	struct strbuf url_buf = STRBUF_INIT;
+	struct strbuf remote_info_buf = STRBUF_INIT;
 	const char **url;
 	int i, url_nr;
 
 	if (remote->url_nr > 0) {
-		strbuf_addf(&url_buf, "%s (fetch)", remote->url[0]);
+		struct strbuf promisor_config = STRBUF_INIT;
+		const char *partial_clone_filter = NULL;
+
+		strbuf_addf(&promisor_config, "remote.%s.partialclonefilter", remote->name);
+		strbuf_addf(&remote_info_buf, "%s (fetch)", remote->url[0]);
+		if (!git_config_get_string_tmp(promisor_config.buf, &partial_clone_filter))
+			strbuf_addf(&remote_info_buf, " [%s]", partial_clone_filter);
+
+		strbuf_release(&promisor_config);
 		string_list_append(list, remote->name)->util =
-				strbuf_detach(&url_buf, NULL);
+				strbuf_detach(&remote_info_buf, NULL);
 	} else
 		string_list_append(list, remote->name)->util = NULL;
 	if (remote->pushurl_nr) {
@@ -1204,9 +1212,9 @@ static int get_one_entry(struct remote *remote, void *priv)
 	}
 	for (i = 0; i < url_nr; i++)
 	{
-		strbuf_addf(&url_buf, "%s (push)", url[i]);
+		strbuf_addf(&remote_info_buf, "%s (push)", url[i]);
 		string_list_append(list, remote->name)->util =
-				strbuf_detach(&url_buf, NULL);
+				strbuf_detach(&remote_info_buf, NULL);
 	}
 
 	return 0;

t/t5505-remote.sh

@@ -78,6 +78,40 @@ test_expect_success 'add another remote' '
 	)
 '
 
+test_expect_success 'setup bare clone for server' '
+	git clone --bare "file://$(pwd)/one" srv.bare &&
+	git -C srv.bare config --local uploadpack.allowfilter 1 &&
+	git -C srv.bare config --local uploadpack.allowanysha1inwant 1
+'
+
+test_expect_success 'filters for promisor remotes are listed by git remote -v' '
+	test_when_finished "rm -rf pc" &&
+	git clone --filter=blob:none "file://$(pwd)/srv.bare" pc &&
+	git -C pc remote -v >out &&
+	grep "srv.bare (fetch) \[blob:none\]" out &&
+
+	git -C pc config remote.origin.partialCloneFilter object:type=commit &&
+	git -C pc remote -v >out &&
+	grep "srv.bare (fetch) \[object:type=commit\]" out
+'
+
+test_expect_success 'filters should not be listed for non promisor remotes (remote -v)' '
+	test_when_finished "rm -rf pc" &&
+	git clone one pc &&
+	git -C pc remote -v >out &&
+	! grep "(fetch) \[.*\]" out
+'
+
+test_expect_success 'filters are listed by git remote -v only' '
+	test_when_finished "rm -rf pc" &&
+	git clone --filter=blob:none "file://$(pwd)/srv.bare" pc &&
+	git -C pc remote >out &&
+	! grep "\[blob:none\]" out &&
+
+	git -C pc remote show >out &&
+	! grep "\[blob:none\]" out
+'
+
 test_expect_success 'check remote-tracking' '
 	(
 		cd test &&