config: fail if --get-urlmatch finds no value

The --get, --get-all and --get-regexp options to git-config exit with
status 1 if the key is not found but --get-urlmatch succeeds in this
case.

Change --get-urlmatch to behave in the same way as the other --get*
options so that all four are consistent.  --get-color is a special case
because it accepts a default value to return and so should not return an
error if the key is not found.

Also clarify this behaviour in the documentation.

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-config.txt

@@ -102,7 +102,7 @@ OPTIONS
 	given URL is returned (if no such key exists, the value for
 	section.key is used as a fallback).  When given just the
 	section as name, do so for all the keys in the section and
-	list them.
+	list them.  Returns error code 1 if no value is found.
 
 --global::
 	For writing options: write to global `~/.gitconfig` file

builtin/config.c

@@ -389,6 +389,7 @@ static int urlmatch_collect_fn(const char *var, const char *value, void *cb)
 
 static int get_urlmatch(const char *var, const char *url)
 {
+	int ret;
 	char *section_tail;
 	struct string_list_item *item;
 	struct urlmatch_config config = { STRING_LIST_INIT_DUP };
@@ -415,6 +416,8 @@ static int get_urlmatch(const char *var, const char *url)
 	git_config_with_options(urlmatch_config_entry, &config,
 				&given_config_source, respect_includes);
 
+	ret = !values.nr;
+
 	for_each_string_list_item(item, &values) {
 		struct urlmatch_current_candidate_value *matched = item->util;
 		struct strbuf buf = STRBUF_INIT;
@@ -431,7 +434,7 @@ static int get_urlmatch(const char *var, const char *url)
 	free(config.url.url);
 
 	free((void *)config.section);
-	return 0;
+	return ret;
 }
 
 static char *default_user_config(void)

t/t1300-repo-config.sh

@@ -1140,6 +1140,9 @@ test_expect_success 'urlmatch' '
 		cookieFile = /tmp/cookie.txt
 	EOF
 
+	test_expect_code 1 git config --bool --get-urlmatch doesnt.exist https://good.example.com >actual &&
+	test_must_be_empty actual &&
+
 	echo true >expect &&
 	git config --bool --get-urlmatch http.SSLverify https://good.example.com >actual &&
 	test_cmp expect actual &&