Classify processes from sessions into cgroups

Create a private cgroup tree associated with no controllers, and use it
to map PIDs to sessions.  Since we use our own path structure, remove
internal cgroup-related helpers that interpret the cgroup path structure
to pull out users, slices, and scopes.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/cgroups-agent/cgroups-agent.c b/src/cgroups-agent/cgroups-agent.c
index 612bc8fde..47a526b87 100644
--- a/src/cgroups-agent/cgroups-agent.c
+++ b/src/cgroups-agent/cgroups-agent.c
@@ -38,17 +38,32 @@ int main(int argc, char *argv[]) {
         log_parse_environment();
         log_open();
 
+#if 0
         /* We send this event to the private D-Bus socket and then the
          * system instance will forward this to the system bus. We do
          * this to avoid an activation loop when we start dbus when we
          * are called when the dbus service is shut down. */
 
         r = bus_open_system_systemd(&bus);
+#else
+        /* Unlike in systemd where this has to use a private socket,
+           since elogind doesn't associate control groups with services
+           and doesn't manage the dbus service, we can just use the
+           system bus.  */
+        r = sd_bus_open_system(&bus);
+#endif // 0
+
         if (r < 0) {
+#if 0
                 /* If we couldn't connect we assume this was triggered
                  * while systemd got restarted/transitioned from
                  * initrd to the system, so let's ignore this */
                 log_debug_errno(r, "Failed to get D-Bus connection: %m");
+#else
+                /* If dbus isn't running or responding, there is nothing
+                 * we can do about it. */
+                log_debug_errno(r, "Failed to open system bus: %m");
+#endif
                 return EXIT_FAILURE;
         }
 
@@ -58,7 +73,11 @@ int main(int argc, char *argv[]) {
                                "Released",
                                "s", argv[1]);
         if (r < 0) {
+#if 0
                 log_debug_errno(r, "Failed to send signal message on private connection: %m");
+#else
+                log_debug_errno(r, "Failed to send signal message: %m");
+#endif
                 return EXIT_FAILURE;
         }