logind: port over to use scopes+slices for all cgroup stuff

In order to prepare things for the single-writer cgroup scheme, let's
make logind use systemd's own primitives for cgroup management.

Every login user now gets his own private slice unit, in which his sessions
live in a scope unit each. Also, add user@$UID.service to the same
slice, and implicitly start it on first login.

1 files changed, 9 insertions, 7 deletions

diff --git a/src/login/logind-session.h b/src/login/logind-session.h
index 60597c2362..e2a46d5907 100644
--- a/src/login/logind-session.h
+++ b/src/login/logind-session.h
@@ -31,9 +31,10 @@ typedef enum KillWho KillWho;
 #include "logind-user.h"
 
 typedef enum SessionState {
+        SESSION_OPENING,  /* Session scope is being created */
         SESSION_ONLINE,   /* Logged in */
         SESSION_ACTIVE,   /* Logged in and in the fg */
-        SESSION_CLOSING,  /* Logged out, but processes still remain */
+        SESSION_CLOSING,  /* Logged out, but scope is still there */
         _SESSION_STATE_MAX,
         _SESSION_STATE_INVALID = -1
 } SessionState;
@@ -81,9 +82,10 @@ struct Session {
         bool remote;
         char *remote_user;
         char *remote_host;
-
         char *service;
-        char *slice;
+
+        char *scope;
+        char *scope_job;
 
         int vtnr;
         Seat *seat;
@@ -94,16 +96,14 @@ struct Session {
         int fifo_fd;
         char *fifo_path;
 
-        char *cgroup_path;
-        char **controllers, **reset_controllers;
-
         bool idle_hint;
         dual_timestamp idle_hint_timestamp;
 
-        bool kill_processes;
         bool in_gc_queue:1;
         bool started:1;
 
+        DBusMessage *create_message;
+
         LIST_FIELDS(Session, sessions_by_user);
         LIST_FIELDS(Session, sessions_by_seat);
 
@@ -138,6 +138,8 @@ int session_send_changed(Session *s, const char *properties);
 int session_send_lock(Session *s, bool lock);
 int session_send_lock_all(Manager *m, bool lock);
 
+int session_send_create_reply(Session *s, DBusError *error);
+
 const char* session_state_to_string(SessionState t) _const_;
 SessionState session_state_from_string(const char *s) _pure_;