Add runlevel stacking, #88

This implementation has the limitation that you cannot have a stacked
runlevel and service of the same name in a runlevel.

src/rc/rc-status.c

@@ -78,8 +78,10 @@ _rc_can_find_pids(void)
 }
 
 static void
-print_level(const char *level)
+print_level(const char *prefix, const char *level)
 {
+	if (prefix)
+		printf("%s ", prefix);
 	printf ("Runlevel: ");
 	if (isatty(fileno(stdout)))
 		printf("%s%s%s\n",
@@ -274,16 +276,28 @@ rc_status(int argc, char **argv)
 	deptree = _rc_deptree_load(0, NULL);
 
 	TAILQ_FOREACH(l, levels, entries) {
-		print_level(l->value);
+		print_level(NULL, l->value);
 		services = rc_services_in_runlevel(l->value);
 		print_services(l->value, services);
+		nservices = rc_runlevel_stacks(l->value);
+		TAILQ_FOREACH(s, nservices, entries) {
+			if (rc_stringlist_find(levels, s->value) != NULL)
+				continue;
+			print_level("Stacked", s->value);
+			sservices = rc_services_in_runlevel(s->value);
+			print_services(s->value, sservices);
+			rc_stringlist_free(sservices);
+		}
+		sservices = NULL;
+		rc_stringlist_free(nservices);
+		nservices = NULL;
 		rc_stringlist_free(services);
 		services = NULL;
 	}
 
 	if (aflag || argc < 2) {
 		/* Show hotplugged services */
-		print_level("hotplugged");
+		print_level("Dynamic", "hotplugged");
 		services = rc_services_in_state(RC_SERVICE_HOTPLUGGED);
 		print_services(NULL, services);
 		rc_stringlist_free(services);
@@ -336,9 +350,9 @@ rc_status(int argc, char **argv)
 			rc_stringlist_free(tmp);
 		}
 		l->value = p;
-		print_level("needed");
+		print_level("Dynamic", "needed");
 		print_services(NULL, nservices);
-		print_level("manual");
+		print_level("Dynamic", "manual");
 		print_services(NULL, services);
 	}
 

src/rc/rc-update.c

@@ -63,11 +63,11 @@ add(const char *runlevel, const char *service)
 			eerror("%s: service `%s' does not exist",
 			    applet, service);
 	} else if (rc_service_in_runlevel(service, runlevel)) {
-		ewarn ("%s: %s already installed in runlevel `%s'; skipping",
+		ewarn("%s: %s already installed in runlevel `%s'; skipping",
 		    applet, service, runlevel);
 		retval = 0;
 	} else if (rc_service_add(runlevel, service)) {
-		einfo ("%s added to runlevel %s", service, runlevel);
+		einfo("service %s added to runlevel %s", service, runlevel);
 		retval = 1;
 	} else
 		eerror("%s: failed to add service `%s' to runlevel `%s': %s",
@@ -83,20 +83,76 @@ delete(const char *runlevel, const char *service)
 
 	errno = 0;
 	if (rc_service_delete(runlevel, service)) {
-		einfo("%s removed from runlevel %s", service, runlevel);
+		einfo("service %s removed from runlevel %s",
+		    service, runlevel);
 		return 1;
 	}
 
 	if (errno == ENOENT)
-		eerror ("%s: service `%s' is not in the runlevel `%s'",
+		eerror("%s: service `%s' is not in the runlevel `%s'",
 		    applet, service, runlevel);
 	else
-		eerror ("%s: failed to remove service `%s' from runlevel `%s': %s",
+		eerror("%s: failed to remove service `%s' from runlevel `%s': %s",
 		    applet, service, runlevel, strerror (errno));
 
 	return retval;
 }
 
+static int
+addstack(const char *runlevel, const char *stack)
+{
+	if (!rc_runlevel_exists(runlevel)) {
+		eerror("%s: runlevel `%s' does not exist", applet, runlevel);
+		return -1;
+	}
+	if (!rc_runlevel_exists(stack)) {
+		eerror("%s: runlevel `%s' does not exist", applet, stack);
+		return -1;
+	}
+	if (strcmp(runlevel, stack) == 0) {
+		eerror("%s: cannot stack `%s' onto itself", applet, stack);
+		return -1;
+	}
+	if (strcmp(runlevel, RC_LEVEL_SYSINIT) == 0 ||
+	    strcmp(stack, RC_LEVEL_SYSINIT) == 0 ||
+	    strcmp(runlevel, RC_LEVEL_BOOT) == 0 ||
+	    strcmp(stack, RC_LEVEL_BOOT) == 0 ||
+	    strcmp(runlevel, RC_LEVEL_SINGLE) == 0 ||
+	    strcmp(stack, RC_LEVEL_SINGLE) == 0 ||
+	    strcmp(runlevel, RC_LEVEL_SHUTDOWN) == 0 ||
+	    strcmp(stack, RC_LEVEL_SHUTDOWN) == 0)
+	{
+		eerror("%s: cannot stack the %s runlevel",
+		    applet, RC_LEVEL_SYSINIT);
+		return -1;
+	}
+	if (!rc_runlevel_stack(runlevel, stack)) {
+		eerror("%s: failed to stack `%s' to `%s': %s",
+		    applet, stack, runlevel, strerror(errno));
+		return -1;
+	}
+	einfo("runlevel %s added to runlevel %s", stack, runlevel);
+	return 1;
+}
+
+static int
+delstack(const char *runlevel, const char *stack)
+{
+	if (rc_runlevel_unstack(runlevel, stack)) {
+		einfo("runlevel %s removed from runlevel %s", stack, runlevel);
+		return 1;
+	}
+
+	if (errno == ENOENT)
+		eerror("%s: runlevel `%s' is not in the runlevel `%s'",
+		    applet, stack, runlevel);
+	else
+		eerror("%s: failed to remove runlevel `%s' from runlevel `%s': %s",
+		    applet, stack, runlevel, strerror (errno));
+
+	return -1;
+}
+
 static void
 show(RC_STRINGLIST *runlevels, bool verbose)
 {
@@ -143,12 +199,14 @@ show(RC_STRINGLIST *runlevels, bool verbose)
 	"Usage: rc-update [options] add service <runlevel>\n"		      \
 	"       rc-update [options] del service <runlevel>\n"		      \
 	"       rc-update [options] show"
-#define getoptstring "u" getoptstring_COMMON
+#define getoptstring "su" getoptstring_COMMON
 static const struct option longopts[] = {
+	{ "stack",           0, NULL, 's' },
 	{ "update",          0, NULL, 'u' },
 	longopts_COMMON
 };
 static const char * const longopts_help[] = {
+	"Stack a runlevel instead of a service",
 	"Force an update of the dependency tree",
 	longopts_help_COMMON
 };
@@ -166,7 +224,7 @@ rc_update(int argc, char **argv)
 	char *service = NULL;
 	char *p;
 	int action = 0;
-	bool verbose = false;
+	bool verbose = false, stack = false;
 	int opt;
 	int retval = EXIT_FAILURE;
 	int num_updated = 0;
@@ -176,11 +234,14 @@ rc_update(int argc, char **argv)
 	while ((opt = getopt_long(argc, argv, getoptstring,
 		    longopts, (int *)0)) != -1)
 		switch (opt) {
+		case 's':
+		    stack = true;
+		break;
 		case 'u':
 			_rc_deptree_load(-1, &ret);
 			return ret;
-			case_RC_COMMON_GETOPT
-			    }
+			case_RC_COMMON_GETOPT;
+		}
 
 	verbose = rc_yesno(getenv ("EINFO_VERBOSE"));
 
@@ -241,9 +302,9 @@ rc_update(int argc, char **argv)
 			eerror ("%s: no service specified", applet);
 		else {
 			if (action & DOADD) {
-				actfunc = add;
+				actfunc = stack ? addstack : add;
 			} else if (action & DODELETE) {
-				actfunc = delete;
+				actfunc = stack ? delstack : delete;
 			} else {
 				rc_stringlist_free(runlevels);
 				eerrorx("%s: invalid action", applet);

src/rc/rc.c

@@ -1037,7 +1037,7 @@ main(int argc, char **argv)
 
 	/* Load our list of start services */
 	hotplugged_services = rc_services_in_state(RC_SERVICE_HOTPLUGGED);
-	start_services = rc_services_in_runlevel(newlevel ?
+	start_services = rc_services_in_runlevel_stacked(newlevel ?
 	    newlevel : runlevel);
 	if (strcmp(newlevel ? newlevel : runlevel, RC_LEVEL_SHUTDOWN) != 0 &&
 	    strcmp(newlevel ? newlevel : runlevel, RC_LEVEL_SYSINIT) != 0)