logind: add infrastructure to keep track of machines, and move to slices

- This changes all logind cgroup objects to use slice objects rather
  than fixed croup locations.

- logind can now collect minimal information about running
  VMs/containers. As fixed cgroup locations can no longer be used we
  need an entity that keeps track of machine cgroups in whatever slice
  they might be located. Since logind already keeps track of users,
  sessions and seats this is a trivial addition.

- nspawn will now register with logind and pass various bits of metadata
  along. A new option "--slice=" has been added to place the container
  in a specific slice.

- loginctl gained commands to list, introspect and terminate machines.

- user.slice and machine.slice will now be pulled in by logind.service,
  since only logind.service requires this slice.

1 files changed, 11 insertions, 2 deletions

diff --git a/src/login/logind.h b/src/login/logind.h
index 904dc20467..ce25211878 100644
--- a/src/login/logind.h
+++ b/src/login/logind.h
@@ -41,6 +41,7 @@ typedef struct Manager Manager;
 #include "logind-inhibit.h"
 #include "logind-button.h"
 #include "logind-action.h"
+#include "logind-machine.h"
 
 struct Manager {
         DBusConnection *bus;
@@ -51,10 +52,12 @@ struct Manager {
         Hashmap *users;
         Hashmap *inhibitors;
         Hashmap *buttons;
+        Hashmap *machines;
 
         LIST_HEAD(Seat, seat_gc_queue);
         LIST_HEAD(Session, session_gc_queue);
         LIST_HEAD(User, user_gc_queue);
+        LIST_HEAD(Machine, machine_gc_queue);
 
         struct udev *udev;
         struct udev_monitor *udev_seat_monitor, *udev_vcsa_monitor, *udev_button_monitor;
@@ -74,7 +77,7 @@ struct Manager {
 
         Seat *vtconsole;
 
-        char *cgroup_path;
+        char *cgroup_root;
         char **controllers, **reset_controllers;
 
         char **kill_only_users, **kill_exclude_users;
@@ -86,6 +89,7 @@ struct Manager {
 
         Hashmap *session_cgroups;
         Hashmap *user_cgroups;
+        Hashmap *machine_cgroups;
 
         Hashmap *session_fds;
         Hashmap *inhibitor_fds;
@@ -139,11 +143,12 @@ void manager_free(Manager *m);
 int manager_add_device(Manager *m, const char *sysfs, Device **_device);
 int manager_add_button(Manager *m, const char *name, Button **_button);
 int manager_add_seat(Manager *m, const char *id, Seat **_seat);
-int manager_add_session(Manager *m, User *u, const char *id, Session **_session);
+int manager_add_session(Manager *m, const char *id, Session **_session);
 int manager_add_user(Manager *m, uid_t uid, gid_t gid, const char *name, User **_user);
 int manager_add_user_by_name(Manager *m, const char *name, User **_user);
 int manager_add_user_by_uid(Manager *m, uid_t uid, User **_user);
 int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **_inhibitor);
+int manager_add_machine(Manager *m, const char *name, Machine **_machine);
 
 int manager_process_seat_device(Manager *m, struct udev_device *d);
 int manager_process_button_device(Manager *m, struct udev_device *d);
@@ -160,6 +165,7 @@ int manager_enumerate_seats(Manager *m);
 int manager_enumerate_sessions(Manager *m);
 int manager_enumerate_users(Manager *m);
 int manager_enumerate_inhibitors(Manager *m);
+int manager_enumerate_machines(Manager *m);
 
 int manager_startup(Manager *m);
 int manager_run(Manager *m);
@@ -172,8 +178,11 @@ void manager_gc(Manager *m, bool drop_not_started);
 int manager_get_idle_hint(Manager *m, dual_timestamp *t);
 
 int manager_get_user_by_cgroup(Manager *m, const char *cgroup, User **user);
+int manager_get_user_by_pid(Manager *m, pid_t pid, User **user);
 int manager_get_session_by_cgroup(Manager *m, const char *cgroup, Session **session);
 int manager_get_session_by_pid(Manager *m, pid_t pid, Session **session);
+int manager_get_machine_by_cgroup(Manager *m, const char *cgroup, Machine **machine);
+int manager_get_machine_by_pid(Manager *m, pid_t pid, Machine **machine);
 
 extern const DBusObjectPathVTable bus_manager_vtable;