core: map the 'rescue' argument to rescue.target

Even though the 'emergency' and 'single' aliases come from sysvinit, the
lack of 'rescue' is still quite confusing (caught me by surprise for the
9th time yet) and inconsistent with `systemctl rescue` as well.

diff --git a/src/core/main.c b/src/core/main.c
index 1a62e04c80716ffd22bf6f13750e6d043e651170..44373cc7ef435f23079da0f00b49eaf2d0f02843 100644 (file)
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -272,6 +272,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
         static const char * const rlmap[] = {
                 "emergency", SPECIAL_EMERGENCY_TARGET,
                 "-b",        SPECIAL_EMERGENCY_TARGET,
+                "rescue",    SPECIAL_RESCUE_TARGET,
                 "single",    SPECIAL_RESCUE_TARGET,
                 "-s",        SPECIAL_RESCUE_TARGET,
                 "s",         SPECIAL_RESCUE_TARGET,