chiark / gitweb /
Prep v234: Re-add user/session to the gc_queue when stopping.
[elogind.git] / src / login / logind-session.c
index 9025788..10e9327 100644 (file)
 #include "bus-error.h"
 #include "bus-util.h"
 #include "escape.h"
+#include "extract-word.h"
 #include "fd-util.h"
 #include "fileio.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "io-util.h"
 #include "logind-session.h"
 #include "mkdir.h"
@@ -46,7 +47,7 @@
 #include "user-util.h"
 #include "util.h"
 
-// #define RELEASE_USEC (20*USEC_PER_SEC)
+#define RELEASE_USEC (20*USEC_PER_SEC)
 
 static void session_remove_fifo(Session *s);
 
@@ -62,16 +63,13 @@ Session* session_new(Manager *m, const char *id) {
                 return NULL;
 
         s->state_file = strappend("/run/systemd/sessions/", id);
-        if (!s->state_file) {
-                free(s);
-                return NULL;
-        }
+        if (!s->state_file)
+                return mfree(s);
 
         s->devices = hashmap_new(&devt_hash_ops);
         if (!s->devices) {
                 free(s->state_file);
-                free(s);
-                return NULL;
+                return mfree(s);
         }
 
         s->id = basename(s->state_file);
@@ -79,8 +77,7 @@ Session* session_new(Manager *m, const char *id) {
         if (hashmap_put(m->sessions, s->id, s) < 0) {
                 hashmap_free(s->devices);
                 free(s->state_file);
-                free(s);
-                return NULL;
+                return mfree(s);
         }
 
         s->manager = m;
@@ -158,6 +155,18 @@ void session_set_user(Session *s, User *u) {
         LIST_PREPEND(sessions_by_user, u->sessions, s);
 }
 
+static void session_save_devices(Session *s, FILE *f) {
+        SessionDevice *sd;
+        Iterator i;
+
+        if (!hashmap_isempty(s->devices)) {
+                fprintf(f, "DEVICES=");
+                HASHMAP_FOREACH(sd, s->devices, i)
+                        fprintf(f, "%u:%u ", major(sd->dev), minor(sd->dev));
+                fprintf(f, "\n");
+        }
+}
+
 int session_save(Session *s) {
         _cleanup_free_ char *temp_path = NULL;
         _cleanup_fclose_ FILE *f = NULL;
@@ -289,8 +298,10 @@ int session_save(Session *s) {
                         s->timestamp.realtime,
                         s->timestamp.monotonic);
 
-        if (s->controller)
+        if (s->controller) {
                 fprintf(f, "CONTROLLER=%s\n", s->controller);
+                session_save_devices(s, f);
+        }
 
         r = fflush_and_check(f);
         if (r < 0)
@@ -312,6 +323,43 @@ fail:
         return log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
 }
 
+static int session_load_devices(Session *s, const char *devices) {
+        const char *p;
+        int r = 0;
+
+        assert(s);
+
+        for (p = devices;;) {
+                _cleanup_free_ char *word = NULL;
+                SessionDevice *sd;
+                dev_t dev;
+                int k;
+
+                k = extract_first_word(&p, &word, NULL, 0);
+                if (k == 0)
+                        break;
+                if (k < 0) {
+                        r = k;
+                        break;
+                }
+
+                k = parse_dev(word, &dev);
+                if (k < 0) {
+                        r = k;
+                        continue;
+                }
+
+                /* The file descriptors for loaded devices will be reattached later. */
+                k = session_device_new(s, dev, false, &sd);
+                if (k < 0)
+                        r = k;
+        }
+
+        if (r < 0)
+                log_error_errno(r, "Loading session devices for session %s failed: %m", s->id);
+
+        return r;
+}
 
 int session_load(Session *s) {
         _cleanup_free_ char *remote = NULL,
@@ -325,7 +373,9 @@ int session_load(Session *s) {
                 *uid = NULL,
                 *realtime = NULL,
                 *monotonic = NULL,
-                *controller = NULL;
+                *controller = NULL,
+                *active = NULL,
+                *devices = NULL;
 
         int k, r;
 
@@ -355,6 +405,8 @@ int session_load(Session *s) {
                            "REALTIME",       &realtime,
                            "MONOTONIC",      &monotonic,
                            "CONTROLLER",     &controller,
+                           "ACTIVE",         &active,
+                           "DEVICES",        &devices,
                            NULL);
 
         if (r < 0)
@@ -457,10 +509,17 @@ int session_load(Session *s) {
         if (monotonic)
                 timestamp_deserialize(monotonic, &s->timestamp.monotonic);
 
+        if (active) {
+                k = parse_boolean(active);
+                if (k >= 0)
+                        s->was_active = k;
+        }
+
         if (controller) {
-                if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0)
-                        session_set_controller(s, controller, false);
-                else
+                if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) {
+                        session_set_controller(s, controller, false, false);
+                        session_load_devices(s, devices);
+                } else
                         session_restore_vt(s);
         }
 
@@ -516,7 +575,7 @@ static int session_start_scope(Session *s) {
                 char *scope, *job = NULL;
                 const char *description;
 
-                scope = strjoin("session-", s->id, ".scope", NULL);
+                scope = strjoin("session-", s->id, ".scope");
                 if (!scope)
                         return log_oom();
 
@@ -550,8 +609,7 @@ static int session_start_scope(Session *s) {
 
         return 0;
 }
-#endif // 0
-
+#else
 static int session_start_cgroup(Session *s) {
         int r;
 
@@ -570,7 +628,7 @@ static int session_start_cgroup(Session *s) {
 
         return 0;
 }
-
+#endif // 0
 
 int session_start(Session *s) {
         int r;
@@ -588,9 +646,7 @@ int session_start(Session *s) {
                 return r;
 
         /* Create cgroup */
-/// elogind does its own session management without systemd units,
-/// slices and scopes
-#if 0
+#if 0 /// elogind does its own session management
         r = session_start_scope(s);
 #else
         r = session_start_cgroup(s);
@@ -599,7 +655,7 @@ int session_start(Session *s) {
                 return r;
 
         log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
-                   LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START),
+                   "MESSAGE_ID=" SD_MESSAGE_SESSION_START_STR,
                    "SESSION_ID=%s", s->id,
                    "USER_ID=%s", s->user->name,
                    "LEADER="PID_FMT, s->leader,
@@ -624,12 +680,10 @@ int session_start(Session *s) {
 
         /* Send signals */
         session_send_signal(s, true);
-        user_send_changed(s->user, "Sessions", "Display", NULL);
+        user_send_changed(s->user, "Display", NULL);
         if (s->seat) {
                 if (s->seat->active == s)
-                        seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL);
-                else
-                        seat_send_changed(s->seat, "Sessions", NULL);
+                        seat_send_changed(s->seat, "ActiveSession", NULL);
         }
 
         return 0;
@@ -638,7 +692,6 @@ int session_start(Session *s) {
 #if 0 /// UNNEEDED by elogind
 static int session_stop_scope(Session *s, bool force) {
         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        char *job = NULL;
         int r;
 
         assert(s);
@@ -646,27 +699,29 @@ static int session_stop_scope(Session *s, bool force) {
         if (!s->scope)
                 return 0;
 
+        /* Let's always abandon the scope first. This tells systemd that we are not interested anymore, and everything
+         * that is left in the scope is "left-over". Informing systemd about this has the benefit that it will log
+         * when killing any processes left after this point. */
+        r = manager_abandon_scope(s->manager, s->scope, &error);
+        if (r < 0)
+                log_warning_errno(r, "Failed to abandon session scope, ignoring: %s", bus_error_message(&error, r));
+
+        /* Optionally, let's kill everything that's left now. */
         if (force || manager_shall_kill(s->manager, s->user->name)) {
+                char *job = NULL;
+
                 r = manager_stop_unit(s->manager, s->scope, &error, &job);
-                if (r < 0) {
-                        log_error("Failed to stop session scope: %s", bus_error_message(&error, r));
-                        return r;
-                }
+                if (r < 0)
+                        return log_error_errno(r, "Failed to stop session scope: %s", bus_error_message(&error, r));
 
                 free(s->scope_job);
                 s->scope_job = job;
-        } else {
-                r = manager_abandon_scope(s->manager, s->scope, &error);
-                if (r < 0) {
-                        log_error("Failed to abandon session scope: %s", bus_error_message(&error, r));
-                        return r;
-                }
-        }
+        } else
+                s->scope_job = mfree(s->scope_job);
 
         return 0;
 }
-#endif // 0
-
+#else
 static int session_stop_cgroup(Session *s, bool force) {
         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         int r;
@@ -681,6 +736,7 @@ static int session_stop_cgroup(Session *s, bool force) {
 
         return 0;
 }
+#endif // 0
 
 int session_stop(Session *s, bool force) {
         int r;
@@ -712,6 +768,10 @@ int session_stop(Session *s, bool force) {
         session_save(s);
         user_save(s->user);
 
+#if 1 /// elogind must queue this session again
+        session_add_to_gc_queue(s);
+#endif // 1
+
         return r;
 }
 
@@ -725,7 +785,7 @@ int session_finalize(Session *s) {
 
         if (s->started)
                 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
-                           LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
+                           "MESSAGE_ID=" SD_MESSAGE_SESSION_STOP_STR,
                            "SESSION_ID=%s", s->id,
                            "USER_ID=%s", s->user->name,
                            "LEADER="PID_FMT, s->leader,
@@ -755,16 +815,14 @@ int session_finalize(Session *s) {
                         seat_set_active(s->seat, NULL);
 
                 seat_save(s->seat);
-                seat_send_changed(s->seat, "Sessions", NULL);
         }
 
         user_save(s->user);
-        user_send_changed(s->user, "Sessions", "Display", NULL);
+        user_send_changed(s->user, "Display", NULL);
 
         return 0;
 }
 
-#if 0 /// UNNEEDED by elogind
 static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
         Session *s = userdata;
 
@@ -774,7 +832,6 @@ static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *us
         session_stop(s, false);
         return 0;
 }
-#endif // 0
 
 int session_release(Session *s) {
         assert(s);
@@ -785,19 +842,11 @@ int session_release(Session *s) {
         if (s->timer_event_source)
                 return 0;
 
-        /* In systemd, session release is triggered by user jobs
-           dying.  In elogind we don't have that so go ahead and stop
-           now.  */
-#if 0
         return sd_event_add_time(s->manager->event,
                                  &s->timer_event_source,
                                  CLOCK_MONOTONIC,
                                  now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
                                  release_timeout_callback, s);
-
-#else
-        return session_stop(s, false);
-#endif // 0
 }
 
 bool session_is_active(Session *s) {
@@ -1028,10 +1077,6 @@ bool session_check_gc(Session *s, bool drop_not_started) {
                 return true;
 #endif // 0
 
-        if ( s->user->manager
-          && (cg_is_empty_recursive (SYSTEMD_CGROUP_CONTROLLER, s->user->manager->cgroup_root) > 0) )
-                return true;
-
         return false;
 }
 
@@ -1084,13 +1129,10 @@ int session_kill(Session *s, KillWho who, int signo) {
                         return log_error_errno(errno, "Failed to kill process leader %d for session %s: %m", s->leader, s->id);
                 }
                 return 0;
-        } else {
-                bool sigcont = false;
-                bool ignore_self = true;
-                bool rem = true;
+        } else
                 return cg_kill_recursive (SYSTEMD_CGROUP_CONTROLLER, s->id, signo,
-                                          sigcont, ignore_self, rem, NULL);
-        }
+                                          CGROUP_IGNORE_SELF | CGROUP_REMOVE,
+                                          NULL, NULL, NULL);
 #endif // 0
 }
 
@@ -1270,7 +1312,7 @@ static int on_bus_track(sd_bus_track *track, void *userdata) {
         return 0;
 }
 
-int session_set_controller(Session *s, const char *sender, bool force) {
+int session_set_controller(Session *s, const char *sender, bool force, bool prepare) {
         _cleanup_free_ char *name = NULL;
         int r;
 
@@ -1302,11 +1344,14 @@ int session_set_controller(Session *s, const char *sender, bool force) {
          * Note that we reset the VT on ReleaseControl() and if the controller
          * exits.
          * If logind crashes/restarts, we restore the controller during restart
-         * or reset the VT in case it crashed/exited, too. */
-        r = session_prepare_vt(s);
-        if (r < 0) {
-                s->track = sd_bus_track_unref(s->track);
-                return r;
+         * (without preparing the VT since the controller has probably overridden
+         * VT state by now) or reset the VT in case it crashed/exited, too. */
+        if (prepare) {
+                r = session_prepare_vt(s);
+                if (r < 0) {
+                        s->track = sd_bus_track_unref(s->track);
+                        return r;
+                }
         }
 
         session_release_controller(s, true);