unit: introduce unit_load_related_unit()

2 files changed, 24 insertions, 0 deletions

diff --git a/unit.c b/unit.c
index a8058500d1..6d6f56416d 100644
--- a/unit.c
+++ b/unit.c
@@ -1440,6 +1440,28 @@ CGroupBonding* unit_get_default_cgroup(Unit *u) {
         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
 }
 
+int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
+        char *t;
+        int r;
+
+        assert(u);
+        assert(type);
+        assert(_found);
+
+        if (!(t = unit_name_change_suffix(unit_id(u), type)))
+                return -ENOMEM;
+
+        assert(!unit_has_name(u, t));
+
+        r = manager_load_unit(u->meta.manager, t, _found);
+        free(t);
+
+        if (r >= 0)
+                assert(*_found != u);
+
+        return r;
+}
+
 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
         [UNIT_SERVICE] = "service",
         [UNIT_TIMER] = "timer",
diff --git a/unit.h b/unit.h
index 9def661ce1..bfd0907fc3 100644
--- a/unit.h
+++ b/unit.h
@@ -324,6 +324,8 @@ char *unit_name_escape_path(const char *path, const char *suffix);
 
 char *unit_dbus_path(Unit *u);
 
+int unit_load_related_unit(Unit *u, const char *type, Unit **_found);
+
 const char *unit_type_to_string(UnitType i);
 UnitType unit_type_from_string(const char *s);