core: rework the "no_gc" unit flag to become a more generic "perpetual" flag

So far "no_gc" was set on -.slice and init.scope, to units that are always
running, cannot be stopped and never exist in an "inactive" state. Since these
units are the only users of this flag, let's remodel it and rename it
"perpetual" and let's derive more funcitonality off it. Specifically, refuse
enqueing stop jobs for these units, and report that they are "unstoppable" in
the CanStop bus property.

1 files changed, 4 insertions, 6 deletions

diff --git a/src/core/slice.c b/src/core/slice.c
index 0fef29661f..c505fa1916 100644
--- a/src/core/slice.c
+++ b/src/core/slice.c
@@ -136,15 +136,13 @@ static int slice_load_root_slice(Unit *u) {
         if (!unit_has_name(u, SPECIAL_ROOT_SLICE))
                 return 0;
 
-        u->no_gc = true;
+        u->perpetual = true;
 
         /* The root slice is a bit special. For example it is always running and cannot be terminated. Because of its
          * special semantics we synthesize it here, instead of relying on the unit file on disk. */
 
         u->default_dependencies = false;
         u->ignore_on_isolate = true;
-        u->refuse_manual_start = true;
-        u->refuse_manual_stop = true;
 
         if (!u->description)
                 u->description = strdup("Root Slice");
@@ -302,7 +300,7 @@ static void slice_enumerate(Manager *m) {
         u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
         if (!u) {
                 u = unit_new(m, sizeof(Slice));
-                if (!u)  {
+                if (!u) {
                         log_oom();
                         return;
                 }
@@ -310,12 +308,12 @@ static void slice_enumerate(Manager *m) {
                 r = unit_add_name(u, SPECIAL_ROOT_SLICE);
                 if (r < 0) {
                         unit_free(u);
-                        log_error_errno(r, "Failed to add the "SPECIAL_ROOT_SLICE " name: %m");
+                        log_error_errno(r, "Failed to add the " SPECIAL_ROOT_SLICE " name: %m");
                         return;
                 }
         }
 
-        u->no_gc = true;
+        u->perpetual = true;
         SLICE(u)->deserialized_state = SLICE_ACTIVE;
 
         unit_add_to_load_queue(u);