/* SPDX-License-Identifier: LGPL-2.1+ */
-/***
- This file is part of systemd.
-
- Copyright 2011 Lennart Poettering
-***/
#include <errno.h>
#include <string.h>
#include <unistd.h>
-#include <stdio_ext.h>
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-util.h"
#include "cgroup-util.h"
#include "clean-ipc.h"
+#include "env-file.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "hashmap.h"
#include "label.h"
+#include "limits-util.h"
+#include "logind-dbus.h"
#include "logind-user.h"
+#include "logind-user-dbus.h"
#include "mkdir.h"
#include "parse-util.h"
#include "path-util.h"
#include "rm-rf.h"
+#include "serialize.h"
#include "special.h"
#include "stdio-util.h"
#include "string-table.h"
+#include "strv.h"
+#include "tmpfile-util.h"
#include "unit-name.h"
#include "user-util.h"
#include "util.h"
-int user_new(User **out, Manager *m, uid_t uid, gid_t gid, const char *name) {
+int user_new(User **ret,
+ Manager *m,
+ uid_t uid,
+ gid_t gid,
+ const char *name,
+ const char *home) {
+
_cleanup_(user_freep) User *u = NULL;
char lu[DECIMAL_STR_MAX(uid_t) + 1];
int r;
- assert(out);
+ assert(ret);
assert(m);
assert(name);
- u = new0(User, 1);
+ u = new(User, 1);
if (!u)
return -ENOMEM;
- u->manager = m;
- u->uid = uid;
- u->gid = gid;
- xsprintf(lu, UID_FMT, uid);
+ *u = (User) {
+ .manager = m,
+ .uid = uid,
+ .gid = gid,
+ .last_session_timestamp = USEC_INFINITY,
+ };
u->name = strdup(name);
if (!u->name)
return -ENOMEM;
+ u->home = strdup(home);
+ if (!u->home)
+ return -ENOMEM;
+
+ path_simplify(u->home, true);
+
if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
return -ENOMEM;
if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
return -ENOMEM;
+ xsprintf(lu, UID_FMT, uid);
r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
if (r < 0)
return r;
if (r < 0)
return r;
+ r = unit_name_build("user-runtime-dir", lu, ".service", &u->runtime_dir_service);
+ if (r < 0)
+ return r;
+
r = hashmap_put(m->users, UID_TO_PTR(uid), u);
if (r < 0)
return r;
if (r < 0)
return r;
- *out = TAKE_PTR(u);
+ r = hashmap_put(m->user_units, u->runtime_dir_service, u);
+ if (r < 0)
+ return r;
+ *ret = TAKE_PTR(u);
return 0;
}
if (u->service)
hashmap_remove_value(u->manager->user_units, u->service, u);
+ if (u->runtime_dir_service)
+ hashmap_remove_value(u->manager->user_units, u->runtime_dir_service, u);
+
if (u->slice)
hashmap_remove_value(u->manager->user_units, u->slice, u);
hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
- u->slice_job = mfree(u->slice_job);
+ (void) sd_event_source_unref(u->timer_event_source);
+
u->service_job = mfree(u->service_job);
u->service = mfree(u->service);
+ u->runtime_dir_service = mfree(u->runtime_dir_service);
u->slice = mfree(u->slice);
u->runtime_path = mfree(u->runtime_path);
u->state_file = mfree(u->state_file);
u->name = mfree(u->name);
+ u->home = mfree(u->home);
return mfree(u);
}
if (r < 0)
goto fail;
- (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
(void) fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"NAME=%s\n"
- "STATE=%s\n",
+ "STATE=%s\n" /* friendly user-facing state */
+ "STOPPING=%s\n", /* low-level state */
u->name,
- user_state_to_string(user_get_state(u)));
+ user_state_to_string(user_get_state(u)),
+ yes_no(u->stopping));
/* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
if (u->runtime_path)
if (u->service_job)
fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
- if (u->slice_job)
- fprintf(f, "SLICE_JOB=%s\n", u->slice_job);
-
if (u->display)
fprintf(f, "DISPLAY=%s\n", u->display->id);
u->timestamp.realtime,
u->timestamp.monotonic);
+ if (u->last_session_timestamp != USEC_INFINITY)
+ fprintf(f, "LAST_SESSION_TIMESTAMP=" USEC_FMT "\n",
+ u->last_session_timestamp);
+
if (u->sessions) {
Session *i;
bool first;
if (!u->started)
return 0;
- return user_save_internal (u);
+ return user_save_internal(u);
}
int user_load(User *u) {
- _cleanup_free_ char *display = NULL, *realtime = NULL, *monotonic = NULL;
- Session *s = NULL;
+ _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *stopping = NULL, *last_session_timestamp = NULL;
int r;
assert(u);
- r = parse_env_file(NULL, u->state_file, NEWLINE,
- "SERVICE_JOB", &u->service_job,
- "SLICE_JOB", &u->slice_job,
- "DISPLAY", &display,
- "REALTIME", &realtime,
- "MONOTONIC", &monotonic,
- NULL);
- if (r < 0) {
- if (r == -ENOENT)
- return 0;
-
+ r = parse_env_file(NULL, u->state_file,
+ "SERVICE_JOB", &u->service_job,
+ "STOPPING", &stopping,
+ "REALTIME", &realtime,
+ "MONOTONIC", &monotonic,
+ "LAST_SESSION_TIMESTAMP", &last_session_timestamp);
+ if (r == -ENOENT)
+ return 0;
+ if (r < 0)
return log_error_errno(r, "Failed to read %s: %m", u->state_file);
- }
-
- if (display)
- s = hashmap_get(u->manager->sessions, display);
- if (s && s->display && display_is_local(s->display))
- u->display = s;
+ if (stopping) {
+ r = parse_boolean(stopping);
+ if (r < 0)
+ log_debug_errno(r, "Failed to parse 'STOPPING' boolean: %s", stopping);
+ else
+ u->stopping = r;
+ }
if (realtime)
- timestamp_deserialize(realtime, &u->timestamp.realtime);
+ (void) deserialize_usec(realtime, &u->timestamp.realtime);
if (monotonic)
- timestamp_deserialize(monotonic, &u->timestamp.monotonic);
+ (void) deserialize_usec(monotonic, &u->timestamp.monotonic);
+ if (last_session_timestamp)
+ (void) deserialize_usec(last_session_timestamp, &u->last_session_timestamp);
- return r;
+ return 0;
}
-static int user_start_service(User *u) {
+static void user_start_service(User *u) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
- char *job;
int r;
assert(u);
+ /* Start the service containing the "systemd --user" instance (user@.service). Note that we don't explicitly
+ * start the per-user slice or the systemd-runtime-dir@.service instance, as those are pulled in both by
+ * user@.service and the session scopes as dependencies. */
+
u->service_job = mfree(u->service_job);
- r = manager_start_unit(
- u->manager,
- u->service,
- &error,
- &job);
+ r = manager_start_unit(u->manager, u->service, &error, &u->service_job);
if (r < 0)
- /* we don't fail due to this, let's try to continue */
- log_error_errno(r, "Failed to start user service, ignoring: %s", bus_error_message(&error, r));
- else
- u->service_job = job;
-
- return 0;
+ log_full_errno(sd_bus_error_has_name(&error, BUS_ERROR_UNIT_MASKED) ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to start user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
}
int user_start(User *u) {
- int r;
-
assert(u);
if (u->started && !u->stopping)
return 0;
- /*
- * If u->stopping is set, the user is marked for removal and the slice
- * and service stop-jobs are queued. We have to clear that flag before
- * queing the start-jobs again. If they succeed, the user object can be
- * re-used just fine (pid1 takes care of job-ordering and proper
- * restart), but if they fail, we want to force another user_stop() so
- * possibly pending units are stopped.
- * Note that we don't clear u->started, as we have no clue what state
- * the user is in on failure here. Hence, we pretend the user is
- * running so it will be properly taken down by GC. However, we clearly
- * return an error from user_start() in that case, so no further
- * reference to the user is taken.
- */
+ /* If u->stopping is set, the user is marked for removal and service stop-jobs are queued. We have to clear
+ * that flag before queueing the start-jobs again. If they succeed, the user object can be re-used just fine
+ * (pid1 takes care of job-ordering and proper restart), but if they fail, we want to force another user_stop()
+ * so possibly pending units are stopped. */
u->stopping = false;
if (!u->started)
log_debug("Starting services for new user %s.", u->name);
- /* Save the user data so far, because pam_systemd will read the
- * XDG_RUNTIME_DIR out of it while starting up systemd --user.
- * We need to do user_save_internal() because we have not
- * "officially" started yet. */
+ /* Save the user data so far, because pam_systemd will read the XDG_RUNTIME_DIR out of it while starting up
+ * systemd --user. We need to do user_save_internal() because we have not "officially" started yet. */
user_save_internal(u);
- /* Spawn user systemd */
- r = user_start_service(u);
- if (r < 0)
- return r;
+ /* Start user@UID.service */
+ user_start_service(u);
if (!u->started) {
if (!dual_timestamp_is_set(&u->timestamp))
return 0;
}
-static int user_stop_slice(User *u) {
+static void user_stop_service(User *u) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
- char *job;
int r;
assert(u);
+ assert(u->service);
- r = manager_stop_unit(u->manager, u->slice, &error, &job);
- if (r < 0) {
- log_error("Failed to stop user slice: %s", bus_error_message(&error, r));
- return r;
- }
-
- free(u->slice_job);
- u->slice_job = job;
-
- return r;
-}
-
-static int user_stop_service(User *u) {
- _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
- char *job;
- int r;
+ /* The reverse of user_start_service(). Note that we only stop user@UID.service here, and let StopWhenUnneeded=
+ * deal with the slice and the user-runtime-dir@.service instance. */
- assert(u);
-
- r = manager_stop_unit(u->manager, u->service, &error, &job);
- if (r < 0) {
- log_error("Failed to stop user service: %s", bus_error_message(&error, r));
- return r;
- }
+ u->service_job = mfree(u->service_job);
- free_and_replace(u->service_job, job);
- return r;
+ r = manager_stop_unit(u->manager, u->service, &error, &u->service_job);
+ if (r < 0)
+ log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
}
int user_stop(User *u, bool force) {
Session *s;
- int r = 0, k;
+ int r = 0;
assert(u);
- /* Stop jobs have already been queued */
- if (u->stopping) {
+ /* This is called whenever we begin with tearing down a user record. It's called in two cases: explicit API
+ * request to do so via the bus (in which case 'force' is true) and automatically due to GC, if there's no
+ * session left pinning it (in which case 'force' is false). Note that this just initiates tearing down of the
+ * user, the User object will remain in memory until user_finalize() is called, see below. */
+
+ if (!u->started)
+ return 0;
+
+ if (u->stopping) { /* Stop jobs have already been queued */
user_save(u);
- return r;
+ return 0;
}
LIST_FOREACH(sessions_by_user, s, u->sessions) {
+ int k;
+
k = session_stop(s, force);
if (k < 0)
r = k;
}
- /* Kill systemd */
- k = user_stop_service(u);
- if (k < 0)
- r = k;
-
- /* Kill cgroup */
- k = user_stop_slice(u);
- if (k < 0)
- r = k;
+ user_stop_service(u);
u->stopping = true;
assert(u);
+ /* Called when the user is really ready to be freed, i.e. when all unit stop jobs and suchlike for it are
+ * done. This is called as a result of an earlier user_done() when all jobs are completed. */
+
if (u->started)
log_debug("User %s logged out.", u->name);
r = k;
}
- unlink(u->state_file);
+ (void) unlink(u->state_file);
user_add_to_gc_queue(u);
if (u->started) {
return -ENOMEM;
p = strjoina("/var/lib/systemd/linger/", cc);
+ if (access(p, F_OK) < 0) {
+ if (errno != ENOENT)
+ return -errno;
+
+ return false;
+ }
+
+ return true;
+}
+
+static bool user_unit_active(User *u) {
+ const char *i;
+ int r;
+
+ assert(u->service);
+ assert(u->runtime_dir_service);
+ assert(u->slice);
- return access(p, F_OK) >= 0;
+ FOREACH_STRING(i, u->service, u->runtime_dir_service, u->slice) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ r = manager_unit_is_active(u->manager, i, &error);
+ if (r < 0)
+ log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", u->service, bus_error_message(&error, r));
+ if (r != 0)
+ return true;
+ }
+
+ return false;
}
bool user_may_gc(User *u, bool drop_not_started) {
+ int r;
+
assert(u);
if (drop_not_started && !u->started)
if (u->sessions)
return false;
- if (user_check_linger_file(u) > 0)
- return false;
+ if (u->last_session_timestamp != USEC_INFINITY) {
+ /* All sessions have been closed. Let's see if we shall leave the user record around for a bit */
- if (u->slice_job && manager_job_is_active(u->manager, u->slice_job))
- return false;
+ if (u->manager->user_stop_delay == USEC_INFINITY)
+ return false; /* Leave it around forever! */
+ if (u->manager->user_stop_delay > 0 &&
+ now(CLOCK_MONOTONIC) < usec_add(u->last_session_timestamp, u->manager->user_stop_delay))
+ return false; /* Leave it around for a bit longer. */
+ }
- if (u->service_job && manager_job_is_active(u->manager, u->service_job))
+ /* Is this a user that shall stay around forever ("linger")? Before we say "no" to GC'ing for lingering users, let's check
+ * if any of the three units that we maintain for this user is still around. If none of them is,
+ * there's no need to keep this user around even if lingering is enabled. */
+ if (user_check_linger_file(u) > 0 && user_unit_active(u))
return false;
+ /* Check if our job is still pending */
+ if (u->service_job) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ r = manager_job_is_active(u->manager, u->service_job, &error);
+ if (r < 0)
+ log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", u->service_job, bus_error_message(&error, r));
+ if (r != 0)
+ return false;
+ }
+
+ /* Note that we don't care if the three units we manage for each user object are up or not, as we are managing
+ * their state rather than tracking it. */
+
return true;
}
if (u->stopping)
return USER_CLOSING;
- if (!u->started || u->slice_job || u->service_job)
+ if (!u->started || u->service_job)
return USER_OPENING;
if (u->sessions) {
return all_closing ? USER_CLOSING : USER_ONLINE;
}
- if (user_check_linger_file(u) > 0)
+ if (user_check_linger_file(u) > 0 && user_unit_active(u))
return USER_LINGERING;
return USER_CLOSING;
}
static bool elect_display_filter(Session *s) {
- /* Return true if the session is a candidate for the user’s ‘primary
- * session’ or ‘display’. */
+ /* Return true if the session is a candidate for the user’s ‘primary session’ or ‘display’. */
assert(s);
- return (s->class == SESSION_USER && !s->stopping);
+ return IN_SET(s->class, SESSION_USER, SESSION_GREETER) && s->started && !s->stopping;
}
static int elect_display_compare(Session *s1, Session *s2) {
/* Indexed by SessionType. Lower numbers mean more preferred. */
- const int type_ranks[_SESSION_TYPE_MAX] = {
+ static const int type_ranks[_SESSION_TYPE_MAX] = {
[SESSION_UNSPECIFIED] = 0,
[SESSION_TTY] = -2,
[SESSION_X11] = -3,
assert(u);
- /* This elects a primary session for each user, which we call
- * the "display". We try to keep the assignment stable, but we
- * "upgrade" to better choices. */
+ /* This elects a primary session for each user, which we call the "display". We try to keep the assignment
+ * stable, but we "upgrade" to better choices. */
log_debug("Electing new display for user %s", u->name);
LIST_FOREACH(sessions_by_user, s, u->sessions) {
}
}
+static int user_stop_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
+ User *u = userdata;
+
+ assert(u);
+ user_add_to_gc_queue(u);
+
+ return 0;
+}
+
+void user_update_last_session_timer(User *u) {
+ int r;
+
+ assert(u);
+
+ if (u->sessions) {
+ /* There are sessions, turn off the timer */
+ u->last_session_timestamp = USEC_INFINITY;
+ u->timer_event_source = sd_event_source_unref(u->timer_event_source);
+ return;
+ }
+
+ if (u->last_session_timestamp != USEC_INFINITY)
+ return; /* Timer already started */
+
+ u->last_session_timestamp = now(CLOCK_MONOTONIC);
+
+ assert(!u->timer_event_source);
+
+ if (IN_SET(u->manager->user_stop_delay, 0, USEC_INFINITY))
+ return;
+
+ if (sd_event_get_state(u->manager->event) == SD_EVENT_FINISHED) {
+ log_debug("Not allocating user stop timeout, since we are already exiting.");
+ return;
+ }
+
+ r = sd_event_add_time(u->manager->event,
+ &u->timer_event_source,
+ CLOCK_MONOTONIC,
+ usec_add(u->last_session_timestamp, u->manager->user_stop_delay), 0,
+ user_stop_timeout_callback, u);
+ if (r < 0)
+ log_warning_errno(r, "Failed to enqueue user stop event source, ignoring: %m");
+
+ if (DEBUG_LOGGING) {
+ char s[FORMAT_TIMESPAN_MAX];
+
+ log_debug("Last session of user '%s' logged out, terminating user context in %s.",
+ u->name,
+ format_timespan(s, sizeof(s), u->manager->user_stop_delay, USEC_PER_MSEC));
+ }
+}
+
static const char* const user_state_table[_USER_STATE_MAX] = {
[USER_OFFLINE] = "offline",
[USER_OPENING] = "opening",
assert(data);
/* First, try to parse as percentage */
- r = parse_percent(rvalue);
- if (r > 0 && r < 100)
- *sz = physical_memory_scale(r, 100U);
+ r = parse_permille(rvalue);
+ if (r > 0 && r < 1000)
+ *sz = physical_memory_scale(r, 1000U);
else {
uint64_t k;
/* If the passed argument was not a percentage, or out of range, parse as byte size */
r = parse_size(rvalue, 1024, &k);
- if (r < 0 || k <= 0 || (uint64_t) (size_t) k != k) {
- log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
+ if (r >= 0 && (k <= 0 || (uint64_t) (size_t) k != k))
+ r = -ERANGE;
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value '%s', ignoring: %m", rvalue);
return 0;
}
log_syntax(unit, LOG_NOTICE, filename, line, 0,
"Support for option %s= has been removed.",
lvalue);
- log_info("Hint: try creating /etc/systemd/system/user-.slice/50-limits.conf with:\n"
+ log_info("Hint: try creating /etc/systemd/system/user-.slice.d/50-limits.conf with:\n"
" [Slice]\n"
" TasksMax=%s",
rvalue);
projects / thirdparty / systemd.git / blobdiff