core/cron: support 7 as weekday as an alias for sunday

To match crontab behaviour.

check/check_core.c

@@ -63,11 +63,43 @@ Suite *check_core_opt_parsing(void)
 	return s;
 }
 
+START_TEST(test_uwsgi_cron_task_needs_execution_handles_weekday_7_as_sunday)
+{
+	int result;
+	struct tm *t;
+	time_t now;
+
+	now = time(NULL);
+	t = localtime(&now);
+	t->tm_wday= 0;
+
+	result = uwsgi_cron_task_needs_execution(t, -1, -1, -1, -1, 0);
+	ck_assert(result == 1);
+
+	result = uwsgi_cron_task_needs_execution(t, -1, -1, -1, -1, 7);
+	ck_assert(result == 1);
+
+	result = uwsgi_cron_task_needs_execution(t, -1, -1, -1, -1, 1);
+	ck_assert(result == 0);
+}
+END_TEST
+
+Suite *check_core_cron(void)
+{
+	Suite *s = suite_create("uwsgi cron");
+	TCase *tc = tcase_create("cron");
+
+	suite_add_tcase(s, tc);
+	tcase_add_test(tc, test_uwsgi_cron_task_needs_execution_handles_weekday_7_as_sunday);
+	return s;
+}
+
 int main(void)
 {
 	int nf;
 	SRunner *r = srunner_create(check_core_strings());
 	srunner_add_suite(r, check_core_opt_parsing());
+	srunner_add_suite(r, check_core_cron());
 	srunner_run_all(r, CK_NORMAL);
 	nf = srunner_ntests_failed(r);
 	srunner_free(r);

core/master_utils.c

@@ -1687,7 +1687,8 @@ int uwsgi_cron_task_needs_execution(struct tm *uwsgi_cron_delta, int minute, int
 	uc_hour = hour;
 	uc_day = day;
 	uc_month = month;
-	uc_week = week;
+	// support 7 as alias for sunday (0) to match crontab behaviour
+	uc_week = week == 7 ? 0 : week;
 
 	// negative values as interval -1 = * , -5 = */5
 	if (minute < 0) {