+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <assert.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/epoll.h>
-#include <signal.h>
-#include <sys/signalfd.h>
-#include <sys/wait.h>
-#include <unistd.h>
-#include <sys/poll.h>
-#include <sys/reboot.h>
-#include <sys/ioctl.h>
-#include <linux/kd.h>
-#include <termios.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-
-#ifdef HAVE_AUDIT
-#include <libaudit.h>
-#endif
-
-#include <systemd/sd-daemon.h>
-
-#include "manager.h"
-#include "hashmap.h"
-#include "macro.h"
-#include "strv.h"
-#include "log.h"
-#include "util.h"
-#include "mkdir.h"
-#include "ratelimit.h"
-#include "cgroup.h"
-#include "mount-setup.h"
-#include "unit-name.h"
-#include "dbus-unit.h"
-#include "dbus-job.h"
-#include "missing.h"
-#include "path-lookup.h"
-#include "special.h"
-#include "bus-errors.h"
-#include "exit-status.h"
-#include "virt.h"
-#include "watchdog.h"
-
-/* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
-#define GC_QUEUE_ENTRIES_MAX 16
-
-/* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
-#define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
-
-/* Where clients shall send notification messages to */
-#define NOTIFY_SOCKET_SYSTEM "/run/systemd/notify"
-#define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
-
-static int manager_setup_notify(Manager *m) {
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa;
- struct epoll_event ev;
- int one = 1, r;
- mode_t u;
-
- assert(m);
-
- m->notify_watch.type = WATCH_NOTIFY;
- if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
- log_error("Failed to allocate notification socket: %m");
- return -errno;
- }
-
- zero(sa);
- sa.sa.sa_family = AF_UNIX;
-
- if (getpid() != 1)
- snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
- else {
- unlink(NOTIFY_SOCKET_SYSTEM);
- strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
- }
-
- if (sa.un.sun_path[0] == '@')
- sa.un.sun_path[0] = 0;
-
- u = umask(0111);
- r = bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1));
- umask(u);
-
- if (r < 0) {
- log_error("bind() failed: %m");
- return -errno;
- }
-
- if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
- log_error("SO_PASSCRED failed: %m");
- return -errno;
- }
-
- zero(ev);
- ev.events = EPOLLIN;
- ev.data.ptr = &m->notify_watch;
-
- if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
- return -errno;
-
- if (sa.un.sun_path[0] == 0)
- sa.un.sun_path[0] = '@';
-
- if (!(m->notify_socket = strdup(sa.un.sun_path)))
- return -ENOMEM;
-
- log_debug("Using notification socket %s", m->notify_socket);
-
- return 0;
-}
-
-static int enable_special_signals(Manager *m) {
- int fd;
-
- assert(m);
-
- /* Enable that we get SIGINT on control-alt-del */
- if (reboot(RB_DISABLE_CAD) < 0)
- log_warning("Failed to enable ctrl-alt-del handling: %m");
-
- if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
- log_warning("Failed to open /dev/tty0: %m");
- else {
- /* Enable that we get SIGWINCH on kbrequest */
- if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
- log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
-
- close_nointr_nofail(fd);
- }
-
- return 0;
-}
-
-static int manager_setup_signals(Manager *m) {
- sigset_t mask;
- struct epoll_event ev;
- struct sigaction sa;
-
- assert(m);
-
- /* We are not interested in SIGSTOP and friends. */
- zero(sa);
- sa.sa_handler = SIG_DFL;
- sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
- assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
-
- assert_se(sigemptyset(&mask) == 0);
-
- sigset_add_many(&mask,
- SIGCHLD, /* Child died */
- SIGTERM, /* Reexecute daemon */
- SIGHUP, /* Reload configuration */
- SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
- SIGUSR2, /* systemd: dump status */
- SIGINT, /* Kernel sends us this on control-alt-del */
- SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
- SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
- SIGRTMIN+0, /* systemd: start default.target */
- SIGRTMIN+1, /* systemd: isolate rescue.target */
- SIGRTMIN+2, /* systemd: isolate emergency.target */
- SIGRTMIN+3, /* systemd: start halt.target */
- SIGRTMIN+4, /* systemd: start poweroff.target */
- SIGRTMIN+5, /* systemd: start reboot.target */
- SIGRTMIN+6, /* systemd: start kexec.target */
- SIGRTMIN+13, /* systemd: Immediate halt */
- SIGRTMIN+14, /* systemd: Immediate poweroff */
- SIGRTMIN+15, /* systemd: Immediate reboot */
- SIGRTMIN+16, /* systemd: Immediate kexec */
- SIGRTMIN+20, /* systemd: enable status messages */
- SIGRTMIN+21, /* systemd: disable status messages */
- SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
- SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
- SIGRTMIN+26, /* systemd: set log target to journal-or-kmsg */
- SIGRTMIN+27, /* systemd: set log target to console */
- SIGRTMIN+28, /* systemd: set log target to kmsg */
- SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg */
- -1);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
-
- m->signal_watch.type = WATCH_SIGNAL;
- if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
- return -errno;
-
- zero(ev);
- ev.events = EPOLLIN;
- ev.data.ptr = &m->signal_watch;
-
- if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
- return -errno;
-
- if (m->running_as == MANAGER_SYSTEM)
- return enable_special_signals(m);
-
- return 0;
-}
-
-static void manager_strip_environment(Manager *m) {
- assert(m);
-
- /* Remove variables from the inherited set that are part of
- * the container interface:
- * http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface */
- strv_remove_prefix(m->environment, "container=");
- strv_remove_prefix(m->environment, "container_");
-
- /* Remove variables from the inherited set that are part of
- * the initrd interface:
- * http://www.freedesktop.org/wiki/Software/systemd/InitrdInterface */
- strv_remove_prefix(m->environment, "RD_");
-}
-
-int manager_new(ManagerRunningAs running_as, Manager **_m) {
- Manager *m;
- int r = -ENOMEM;
-
- assert(_m);
- assert(running_as >= 0);
- assert(running_as < _MANAGER_RUNNING_AS_MAX);
-
- if (!(m = new0(Manager, 1)))
- return -ENOMEM;
-
- dual_timestamp_get(&m->startup_timestamp);
-
- m->running_as = running_as;
- m->name_data_slot = m->conn_data_slot = m->subscribed_data_slot = -1;
- m->exit_code = _MANAGER_EXIT_CODE_INVALID;
- m->pin_cgroupfs_fd = -1;
-
-#ifdef HAVE_AUDIT
- m->audit_fd = -1;
-#endif
-
- m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
- m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
-
- m->environment = strv_copy(environ);
- if (!m->environment)
- goto fail;
-
- manager_strip_environment(m);
-
- if (running_as == MANAGER_SYSTEM) {
- m->default_controllers = strv_new("cpu", NULL);
- if (!m->default_controllers)
- goto fail;
- }
-
- if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
- goto fail;
-
- if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
- goto fail;
-
- if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
- goto fail;
-
- if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
- goto fail;
-
- if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
- goto fail;
-
- if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
- goto fail;
-
- if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
- goto fail;
-
- if ((r = lookup_paths_init(&m->lookup_paths, m->running_as, true)) < 0)
- goto fail;
-
- if ((r = manager_setup_signals(m)) < 0)
- goto fail;
-
- if ((r = manager_setup_cgroup(m)) < 0)
- goto fail;
-
- if ((r = manager_setup_notify(m)) < 0)
- goto fail;
-
- /* Try to connect to the busses, if possible. */
- if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
- goto fail;
-
-#ifdef HAVE_AUDIT
- if ((m->audit_fd = audit_open()) < 0 &&
- /* If the kernel lacks netlink or audit support,
- * don't worry about it. */
- errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
- log_error("Failed to connect to audit log: %m");
-#endif
-
- m->taint_usr = dir_is_empty("/usr") > 0;
-
- *_m = m;
- return 0;
-
-fail:
- manager_free(m);
- return r;
-}
-
-static unsigned manager_dispatch_cleanup_queue(Manager *m) {
- Unit *u;
- unsigned n = 0;
-
- assert(m);
-
- while ((u = m->cleanup_queue)) {
- assert(u->in_cleanup_queue);
-
- unit_free(u);
- n++;
- }
-
- return n;
-}
-
-enum {
- GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
- GC_OFFSET_UNSURE, /* No clue */
- GC_OFFSET_GOOD, /* We still need this unit */
- GC_OFFSET_BAD, /* We don't need this unit anymore */
- _GC_OFFSET_MAX
-};
-
-static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
- Iterator i;
- Unit *other;
- bool is_bad;
-
- assert(u);
-
- if (u->gc_marker == gc_marker + GC_OFFSET_GOOD ||
- u->gc_marker == gc_marker + GC_OFFSET_BAD ||
- u->gc_marker == gc_marker + GC_OFFSET_IN_PATH)
- return;
-
- if (u->in_cleanup_queue)
- goto bad;
-
- if (unit_check_gc(u))
- goto good;
-
- u->gc_marker = gc_marker + GC_OFFSET_IN_PATH;
-
- is_bad = true;
-
- SET_FOREACH(other, u->dependencies[UNIT_REFERENCED_BY], i) {
- unit_gc_sweep(other, gc_marker);
-
- if (other->gc_marker == gc_marker + GC_OFFSET_GOOD)
- goto good;
-
- if (other->gc_marker != gc_marker + GC_OFFSET_BAD)
- is_bad = false;
- }
-
- if (is_bad)
- goto bad;
-
- /* We were unable to find anything out about this entry, so
- * let's investigate it later */
- u->gc_marker = gc_marker + GC_OFFSET_UNSURE;
- unit_add_to_gc_queue(u);
- return;
-
-bad:
- /* We definitely know that this one is not useful anymore, so
- * let's mark it for deletion */
- u->gc_marker = gc_marker + GC_OFFSET_BAD;
- unit_add_to_cleanup_queue(u);
- return;
-
-good:
- u->gc_marker = gc_marker + GC_OFFSET_GOOD;
-}
-
-static unsigned manager_dispatch_gc_queue(Manager *m) {
- Unit *u;
- unsigned n = 0;
- unsigned gc_marker;
-
- assert(m);
-
- if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
- (m->gc_queue_timestamp <= 0 ||
- (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
- return 0;
-
- log_debug("Running GC...");
-
- m->gc_marker += _GC_OFFSET_MAX;
- if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
- m->gc_marker = 1;
-
- gc_marker = m->gc_marker;
-
- while ((u = m->gc_queue)) {
- assert(u->in_gc_queue);
-
- unit_gc_sweep(u, gc_marker);
-
- LIST_REMOVE(Unit, gc_queue, m->gc_queue, u);
- u->in_gc_queue = false;
-
- n++;
-
- if (u->gc_marker == gc_marker + GC_OFFSET_BAD ||
- u->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
- log_debug("Collecting %s", u->id);
- u->gc_marker = gc_marker + GC_OFFSET_BAD;
- unit_add_to_cleanup_queue(u);
- }
- }
-
- m->n_in_gc_queue = 0;
- m->gc_queue_timestamp = 0;
-
- return n;
-}
-
-static void manager_clear_jobs_and_units(Manager *m) {
- Job *j;
- Unit *u;
-
- assert(m);
-
- while ((j = hashmap_first(m->transaction_jobs)))
- job_free(j);
-
- while ((u = hashmap_first(m->units)))
- unit_free(u);
-
- manager_dispatch_cleanup_queue(m);
-
- assert(!m->load_queue);
- assert(!m->run_queue);
- assert(!m->dbus_unit_queue);
- assert(!m->dbus_job_queue);
- assert(!m->cleanup_queue);
- assert(!m->gc_queue);
-
- assert(hashmap_isempty(m->transaction_jobs));
- assert(hashmap_isempty(m->jobs));
- assert(hashmap_isempty(m->units));
-}
-
-void manager_free(Manager *m) {
- UnitType c;
-
- assert(m);
-
- manager_clear_jobs_and_units(m);
-
- for (c = 0; c < _UNIT_TYPE_MAX; c++)
- if (unit_vtable[c]->shutdown)
- unit_vtable[c]->shutdown(m);
-
- /* If we reexecute ourselves, we keep the root cgroup
- * around */
- manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
-
- manager_undo_generators(m);
-
- bus_done(m);
-
- hashmap_free(m->units);
- hashmap_free(m->jobs);
- hashmap_free(m->transaction_jobs);
- hashmap_free(m->watch_pids);
- hashmap_free(m->watch_bus);
-
- if (m->epoll_fd >= 0)
- close_nointr_nofail(m->epoll_fd);
- if (m->signal_watch.fd >= 0)
- close_nointr_nofail(m->signal_watch.fd);
- if (m->notify_watch.fd >= 0)
- close_nointr_nofail(m->notify_watch.fd);
-
-#ifdef HAVE_AUDIT
- if (m->audit_fd >= 0)
- audit_close(m->audit_fd);
-#endif
-
- free(m->notify_socket);
-
- lookup_paths_free(&m->lookup_paths);
- strv_free(m->environment);
-
- strv_free(m->default_controllers);
-
- hashmap_free(m->cgroup_bondings);
- set_free_free(m->unit_path_cache);
-
- free(m);
-}
-
-int manager_enumerate(Manager *m) {
- int r = 0, q;
- UnitType c;
-
- assert(m);
-
- /* Let's ask every type to load all units from disk/kernel
- * that it might know */
- for (c = 0; c < _UNIT_TYPE_MAX; c++)
- if (unit_vtable[c]->enumerate)
- if ((q = unit_vtable[c]->enumerate(m)) < 0)
- r = q;
-
- manager_dispatch_load_queue(m);
- return r;
-}
-
-int manager_coldplug(Manager *m) {
- int r = 0, q;
- Iterator i;
- Unit *u;
- char *k;
-
- assert(m);
-
- /* Then, let's set up their initial state. */
- HASHMAP_FOREACH_KEY(u, k, m->units, i) {
-
- /* ignore aliases */
- if (u->id != k)
- continue;
-
- if ((q = unit_coldplug(u)) < 0)
- r = q;
- }
-
- return r;
-}
-
-static void manager_build_unit_path_cache(Manager *m) {
- char **i;
- DIR *d = NULL;
- int r;
-
- assert(m);
-
- set_free_free(m->unit_path_cache);
-
- if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
- log_error("Failed to allocate unit path cache.");
- return;
- }
-
- /* This simply builds a list of files we know exist, so that
- * we don't always have to go to disk */
-
- STRV_FOREACH(i, m->lookup_paths.unit_path) {
- struct dirent *de;
-
- if (!(d = opendir(*i))) {
- log_error("Failed to open directory: %m");
- continue;
- }
-
- while ((de = readdir(d))) {
- char *p;
-
- if (ignore_file(de->d_name))
- continue;
-
- p = join(streq(*i, "/") ? "" : *i, "/", de->d_name, NULL);
- if (!p) {
- r = -ENOMEM;
- goto fail;
- }
-
- if ((r = set_put(m->unit_path_cache, p)) < 0) {
- free(p);
- goto fail;
- }
- }
-
- closedir(d);
- d = NULL;
- }
-
- return;
-
-fail:
- log_error("Failed to build unit path cache: %s", strerror(-r));
-
- set_free_free(m->unit_path_cache);
- m->unit_path_cache = NULL;
-
- if (d)
- closedir(d);
-}
-
-int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
- int r, q;
-
- assert(m);
-
- manager_run_generators(m);
-
- manager_build_unit_path_cache(m);
-
- /* If we will deserialize make sure that during enumeration
- * this is already known, so we increase the counter here
- * already */
- if (serialization)
- m->n_reloading ++;
-
- /* First, enumerate what we can from all config files */
- r = manager_enumerate(m);
-
- /* Second, deserialize if there is something to deserialize */
- if (serialization)
- if ((q = manager_deserialize(m, serialization, fds)) < 0)
- r = q;
-
- /* Third, fire things up! */
- if ((q = manager_coldplug(m)) < 0)
- r = q;
-
- if (serialization) {
- assert(m->n_reloading > 0);
- m->n_reloading --;
- }
-
- return r;
-}
-
-static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
- assert(m);
- assert(j);
-
- /* Deletes one job from the transaction */
-
- manager_transaction_unlink_job(m, j, delete_dependencies);
-
- if (!j->installed)
- job_free(j);
-}
-
-static void transaction_delete_unit(Manager *m, Unit *u) {
- Job *j;
-
- /* Deletes all jobs associated with a certain unit from the
- * transaction */
-
- while ((j = hashmap_get(m->transaction_jobs, u)))
- transaction_delete_job(m, j, true);
-}
-
-static void transaction_clean_dependencies(Manager *m) {
- Iterator i;
- Job *j;
-
- assert(m);
-
- /* Drops all dependencies of all installed jobs */
-
- HASHMAP_FOREACH(j, m->jobs, i) {
- while (j->subject_list)
- job_dependency_free(j->subject_list);
- while (j->object_list)
- job_dependency_free(j->object_list);
- }
-
- assert(!m->transaction_anchor);
-}
-
-static void transaction_abort(Manager *m) {
- Job *j;
-
- assert(m);
-
- while ((j = hashmap_first(m->transaction_jobs)))
- if (j->installed)
- transaction_delete_job(m, j, true);
- else
- job_free(j);
-
- assert(hashmap_isempty(m->transaction_jobs));
-
- transaction_clean_dependencies(m);
-}
-
-static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
- JobDependency *l;
-
- assert(m);
-
- /* A recursive sweep through the graph that marks all units
- * that matter to the anchor job, i.e. are directly or
- * indirectly a dependency of the anchor job via paths that
- * are fully marked as mattering. */
-
- if (j)
- l = j->subject_list;
- else
- l = m->transaction_anchor;
-
- LIST_FOREACH(subject, l, l) {
-
- /* This link does not matter */
- if (!l->matters)
- continue;
-
- /* This unit has already been marked */
- if (l->object->generation == generation)
- continue;
-
- l->object->matters_to_anchor = true;
- l->object->generation = generation;
-
- transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
- }
-}
-
-static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
- JobDependency *l, *last;
-
- assert(j);
- assert(other);
- assert(j->unit == other->unit);
- assert(!j->installed);
-
- /* Merges 'other' into 'j' and then deletes j. */
-
- j->type = t;
- j->state = JOB_WAITING;
- j->override = j->override || other->override;
-
- j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
-
- /* Patch us in as new owner of the JobDependency objects */
- last = NULL;
- LIST_FOREACH(subject, l, other->subject_list) {
- assert(l->subject == other);
- l->subject = j;
- last = l;
- }
-
- /* Merge both lists */
- if (last) {
- last->subject_next = j->subject_list;
- if (j->subject_list)
- j->subject_list->subject_prev = last;
- j->subject_list = other->subject_list;
- }
-
- /* Patch us in as new owner of the JobDependency objects */
- last = NULL;
- LIST_FOREACH(object, l, other->object_list) {
- assert(l->object == other);
- l->object = j;
- last = l;
- }
-
- /* Merge both lists */
- if (last) {
- last->object_next = j->object_list;
- if (j->object_list)
- j->object_list->object_prev = last;
- j->object_list = other->object_list;
- }
-
- /* Kill the other job */
- other->subject_list = NULL;
- other->object_list = NULL;
- transaction_delete_job(m, other, true);
-}
-static bool job_is_conflicted_by(Job *j) {
- JobDependency *l;
-
- assert(j);
-
- /* Returns true if this job is pulled in by a least one
- * ConflictedBy dependency. */
-
- LIST_FOREACH(object, l, j->object_list)
- if (l->conflicts)
- return true;
-
- return false;
-}
-
-static int delete_one_unmergeable_job(Manager *m, Job *j) {
- Job *k;
-
- assert(j);
-
- /* Tries to delete one item in the linked list
- * j->transaction_next->transaction_next->... that conflicts
- * with another one, in an attempt to make an inconsistent
- * transaction work. */
-
- /* We rely here on the fact that if a merged with b does not
- * merge with c, either a or b merge with c neither */
- LIST_FOREACH(transaction, j, j)
- LIST_FOREACH(transaction, k, j->transaction_next) {
- Job *d;
-
- /* Is this one mergeable? Then skip it */
- if (job_type_is_mergeable(j->type, k->type))
- continue;
-
- /* Ok, we found two that conflict, let's see if we can
- * drop one of them */
- if (!j->matters_to_anchor && !k->matters_to_anchor) {
-
- /* Both jobs don't matter, so let's
- * find the one that is smarter to
- * remove. Let's think positive and
- * rather remove stops then starts --
- * except if something is being
- * stopped because it is conflicted by
- * another unit in which case we
- * rather remove the start. */
-
- log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
- log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
-
- if (j->type == JOB_STOP) {
-
- if (job_is_conflicted_by(j))
- d = k;
- else
- d = j;
-
- } else if (k->type == JOB_STOP) {
-
- if (job_is_conflicted_by(k))
- d = j;
- else
- d = k;
- } else
- d = j;
-
- } else if (!j->matters_to_anchor)
- d = j;
- else if (!k->matters_to_anchor)
- d = k;
- else
- return -ENOEXEC;
-
- /* Ok, we can drop one, so let's do so. */
- log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->id, job_type_to_string(d->type));
- transaction_delete_job(m, d, true);
- return 0;
- }
-
- return -EINVAL;
-}
-
-static int transaction_merge_jobs(Manager *m, DBusError *e) {
- Job *j;
- Iterator i;
- int r;
-
- assert(m);
-
- /* First step, check whether any of the jobs for one specific
- * task conflict. If so, try to drop one of them. */
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- JobType t;
- Job *k;
-
- t = j->type;
- LIST_FOREACH(transaction, k, j->transaction_next) {
- if (job_type_merge(&t, k->type) >= 0)
- continue;
-
- /* OK, we could not merge all jobs for this
- * action. Let's see if we can get rid of one
- * of them */
-
- if ((r = delete_one_unmergeable_job(m, j)) >= 0)
- /* Ok, we managed to drop one, now
- * let's ask our callers to call us
- * again after garbage collecting */
- return -EAGAIN;
-
- /* We couldn't merge anything. Failure */
- dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
- job_type_to_string(t), job_type_to_string(k->type), k->unit->id);
- return r;
- }
- }
-
- /* Second step, merge the jobs. */
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- JobType t = j->type;
- Job *k;
-
- /* Merge all transactions */
- LIST_FOREACH(transaction, k, j->transaction_next)
- assert_se(job_type_merge(&t, k->type) == 0);
-
- /* If an active job is mergeable, merge it too */
- if (j->unit->job)
- job_type_merge(&t, j->unit->job->type); /* Might fail. Which is OK */
-
- while ((k = j->transaction_next)) {
- if (j->installed) {
- transaction_merge_and_delete_job(m, k, j, t);
- j = k;
- } else
- transaction_merge_and_delete_job(m, j, k, t);
- }
-
- if (j->unit->job && !j->installed)
- transaction_merge_and_delete_job(m, j, j->unit->job, t);
-
- assert(!j->transaction_next);
- assert(!j->transaction_prev);
- }
-
- return 0;
-}
-
-static void transaction_drop_redundant(Manager *m) {
- bool again;
-
- assert(m);
-
- /* Goes through the transaction and removes all jobs that are
- * a noop */
-
- do {
- Job *j;
- Iterator i;
-
- again = false;
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- bool changes_something = false;
- Job *k;
-
- LIST_FOREACH(transaction, k, j) {
-
- if (!job_is_anchor(k) &&
- (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
- (!k->unit->job || !job_type_is_conflicting(k->type, k->unit->job->type)))
- continue;
-
- changes_something = true;
- break;
- }
-
- if (changes_something)
- continue;
-
- /* log_debug("Found redundant job %s/%s, dropping.", j->unit->id, job_type_to_string(j->type)); */
- transaction_delete_job(m, j, false);
- again = true;
- break;
- }
-
- } while (again);
-}
-
-static bool unit_matters_to_anchor(Unit *u, Job *j) {
- assert(u);
- assert(!j->transaction_prev);
-
- /* Checks whether at least one of the jobs for this unit
- * matters to the anchor. */
-
- LIST_FOREACH(transaction, j, j)
- if (j->matters_to_anchor)
- return true;
-
- return false;
-}
-
-static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
- Iterator i;
- Unit *u;
- int r;
-
- assert(m);
- assert(j);
- assert(!j->transaction_prev);
-
- /* Does a recursive sweep through the ordering graph, looking
- * for a cycle. If we find cycle we try to break it. */
-
- /* Have we seen this before? */
- if (j->generation == generation) {
- Job *k, *delete;
-
- /* If the marker is NULL we have been here already and
- * decided the job was loop-free from here. Hence
- * shortcut things and return right-away. */
- if (!j->marker)
- return 0;
-
- /* So, the marker is not NULL and we already have been
- * here. We have a cycle. Let's try to break it. We go
- * backwards in our path and try to find a suitable
- * job to remove. We use the marker to find our way
- * back, since smart how we are we stored our way back
- * in there. */
- log_warning("Found ordering cycle on %s/%s", j->unit->id, job_type_to_string(j->type));
-
- delete = NULL;
- for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
-
- log_info("Walked on cycle path to %s/%s", k->unit->id, job_type_to_string(k->type));
-
- if (!delete &&
- !k->installed &&
- !unit_matters_to_anchor(k->unit, k)) {
- /* Ok, we can drop this one, so let's
- * do so. */
- delete = k;
- }
-
- /* Check if this in fact was the beginning of
- * the cycle */
- if (k == j)
- break;
- }
-
-
- if (delete) {
- log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->id, job_type_to_string(delete->type));
- transaction_delete_unit(m, delete->unit);
- return -EAGAIN;
- }
-
- log_error("Unable to break cycle");
-
- dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
- return -ENOEXEC;
- }
-
- /* Make the marker point to where we come from, so that we can
- * find our way backwards if we want to break a cycle. We use
- * a special marker for the beginning: we point to
- * ourselves. */
- j->marker = from ? from : j;
- j->generation = generation;
-
- /* We assume that the the dependencies are bidirectional, and
- * hence can ignore UNIT_AFTER */
- SET_FOREACH(u, j->unit->dependencies[UNIT_BEFORE], i) {
- Job *o;
-
- /* Is there a job for this unit? */
- if (!(o = hashmap_get(m->transaction_jobs, u)))
-
- /* Ok, there is no job for this in the
- * transaction, but maybe there is already one
- * running? */
- if (!(o = u->job))
- continue;
-
- if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
- return r;
- }
-
- /* Ok, let's backtrack, and remember that this entry is not on
- * our path anymore. */
- j->marker = NULL;
-
- return 0;
-}
-
-static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
- Job *j;
- int r;
- Iterator i;
- unsigned g;
-
- assert(m);
- assert(generation);
-
- /* Check if the ordering graph is cyclic. If it is, try to fix
- * that up by dropping one of the jobs. */
-
- g = (*generation)++;
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i)
- if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
- return r;
-
- return 0;
-}
-
-static void transaction_collect_garbage(Manager *m) {
- bool again;
-
- assert(m);
-
- /* Drop jobs that are not required by any other job */
-
- do {
- Iterator i;
- Job *j;
-
- again = false;
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- if (j->object_list) {
- /* log_debug("Keeping job %s/%s because of %s/%s", */
- /* j->unit->id, job_type_to_string(j->type), */
- /* j->object_list->subject ? j->object_list->subject->unit->id : "root", */
- /* j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
- continue;
- }
-
- /* log_debug("Garbage collecting job %s/%s", j->unit->id, job_type_to_string(j->type)); */
- transaction_delete_job(m, j, true);
- again = true;
- break;
- }
-
- } while (again);
-}
-
-static int transaction_is_destructive(Manager *m, DBusError *e) {
- Iterator i;
- Job *j;
-
- assert(m);
-
- /* Checks whether applying this transaction means that
- * existing jobs would be replaced */
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
-
- /* Assume merged */
- assert(!j->transaction_prev);
- assert(!j->transaction_next);
-
- if (j->unit->job &&
- j->unit->job != j &&
- !job_type_is_superset(j->type, j->unit->job->type)) {
-
- dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
- return -EEXIST;
- }
- }
-
- return 0;
-}
-
-static void transaction_minimize_impact(Manager *m) {
- bool again;
- assert(m);
-
- /* Drops all unnecessary jobs that reverse already active jobs
- * or that stop a running service. */
-
- do {
- Job *j;
- Iterator i;
-
- again = false;
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- LIST_FOREACH(transaction, j, j) {
- bool stops_running_service, changes_existing_job;
-
- /* If it matters, we shouldn't drop it */
- if (j->matters_to_anchor)
- continue;
-
- /* Would this stop a running service?
- * Would this change an existing job?
- * If so, let's drop this entry */
-
- stops_running_service =
- j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
-
- changes_existing_job =
- j->unit->job &&
- job_type_is_conflicting(j->type, j->unit->job->type);
-
- if (!stops_running_service && !changes_existing_job)
- continue;
-
- if (stops_running_service)
- log_debug("%s/%s would stop a running service.", j->unit->id, job_type_to_string(j->type));
-
- if (changes_existing_job)
- log_debug("%s/%s would change existing job.", j->unit->id, job_type_to_string(j->type));
-
- /* Ok, let's get rid of this */
- log_debug("Deleting %s/%s to minimize impact.", j->unit->id, job_type_to_string(j->type));
-
- transaction_delete_job(m, j, true);
- again = true;
- break;
- }
-
- if (again)
- break;
- }
-
- } while (again);
-}
-
-static int transaction_apply(Manager *m, JobMode mode) {
- Iterator i;
- Job *j;
- int r;
-
- /* Moves the transaction jobs to the set of active jobs */
-
- if (mode == JOB_ISOLATE) {
-
- /* When isolating first kill all installed jobs which
- * aren't part of the new transaction */
- rescan:
- HASHMAP_FOREACH(j, m->jobs, i) {
- assert(j->installed);
-
- if (hashmap_get(m->transaction_jobs, j->unit))
- continue;
-
- /* 'j' itself is safe to remove, but if other jobs
- are invalidated recursively, our iterator may become
- invalid and we need to start over. */
- if (job_finish_and_invalidate(j, JOB_CANCELED) > 0)
- goto rescan;
- }
- }
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- /* Assume merged */
- assert(!j->transaction_prev);
- assert(!j->transaction_next);
-
- if (j->installed)
- continue;
-
- if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
- goto rollback;
- }
-
- while ((j = hashmap_steal_first(m->transaction_jobs))) {
- if (j->installed) {
- /* log_debug("Skipping already installed job %s/%s as %u", j->unit->id, job_type_to_string(j->type), (unsigned) j->id); */
- continue;
- }
-
- if (j->unit->job)
- job_free(j->unit->job);
-
- j->unit->job = j;
- j->installed = true;
- m->n_installed_jobs ++;
-
- /* We're fully installed. Now let's free data we don't
- * need anymore. */
-
- assert(!j->transaction_next);
- assert(!j->transaction_prev);
-
- job_add_to_run_queue(j);
- job_add_to_dbus_queue(j);
- job_start_timer(j);
-
- log_debug("Installed new job %s/%s as %u", j->unit->id, job_type_to_string(j->type), (unsigned) j->id);
- }
-
- /* As last step, kill all remaining job dependencies. */
- transaction_clean_dependencies(m);
-
- return 0;
-
-rollback:
-
- HASHMAP_FOREACH(j, m->transaction_jobs, i) {
- if (j->installed)
- continue;
-
- hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
- }
-
- return r;
-}
-
-static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
- int r;
- unsigned generation = 1;
-
- assert(m);
-
- /* This applies the changes recorded in transaction_jobs to
- * the actual list of jobs, if possible. */
-
- /* First step: figure out which jobs matter */
- transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
-
- /* Second step: Try not to stop any running services if
- * we don't have to. Don't try to reverse running
- * jobs if we don't have to. */
- if (mode == JOB_FAIL)
- transaction_minimize_impact(m);
-
- /* Third step: Drop redundant jobs */
- transaction_drop_redundant(m);
-
- for (;;) {
- /* Fourth step: Let's remove unneeded jobs that might
- * be lurking. */
- if (mode != JOB_ISOLATE)
- transaction_collect_garbage(m);
-
- /* Fifth step: verify order makes sense and correct
- * cycles if necessary and possible */
- if ((r = transaction_verify_order(m, &generation, e)) >= 0)
- break;
-
- if (r != -EAGAIN) {
- log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
- goto rollback;
- }
-
- /* Let's see if the resulting transaction ordering
- * graph is still cyclic... */
- }
-
- for (;;) {
- /* Sixth step: let's drop unmergeable entries if
- * necessary and possible, merge entries we can
- * merge */
- if ((r = transaction_merge_jobs(m, e)) >= 0)
- break;
-
- if (r != -EAGAIN) {
- log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
- goto rollback;
- }
-
- /* Seventh step: an entry got dropped, let's garbage
- * collect its dependencies. */
- if (mode != JOB_ISOLATE)
- transaction_collect_garbage(m);
-
- /* Let's see if the resulting transaction still has
- * unmergeable entries ... */
- }
-
- /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
- transaction_drop_redundant(m);
-
- /* Ninth step: check whether we can actually apply this */
- if (mode == JOB_FAIL)
- if ((r = transaction_is_destructive(m, e)) < 0) {
- log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
- goto rollback;
- }
-
- /* Tenth step: apply changes */
- if ((r = transaction_apply(m, mode)) < 0) {
- log_warning("Failed to apply transaction: %s", strerror(-r));
- goto rollback;
- }
-
- assert(hashmap_isempty(m->transaction_jobs));
- assert(!m->transaction_anchor);
-
- return 0;
-
-rollback:
- transaction_abort(m);
- return r;
-}
-
-static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
- Job *j, *f;
-
- assert(m);
- assert(unit);
-
- /* Looks for an existing prospective job and returns that. If
- * it doesn't exist it is created and added to the prospective
- * jobs list. */
-
- f = hashmap_get(m->transaction_jobs, unit);
-
- LIST_FOREACH(transaction, j, f) {
- assert(j->unit == unit);
-
- if (j->type == type) {
- if (is_new)
- *is_new = false;
- return j;
- }
- }
-
- if (unit->job && unit->job->type == type)
- j = unit->job;
- else if (!(j = job_new(m, type, unit)))
- return NULL;
-
- j->generation = 0;
- j->marker = NULL;
- j->matters_to_anchor = false;
- j->override = override;
-
- LIST_PREPEND(Job, transaction, f, j);
-
- if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
- job_free(j);
- return NULL;
- }
-
- if (is_new)
- *is_new = true;
-
- /* log_debug("Added job %s/%s to transaction.", unit->id, job_type_to_string(type)); */
-
- return j;
-}
-
-void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
- assert(m);
- assert(j);
-
- if (j->transaction_prev)
- j->transaction_prev->transaction_next = j->transaction_next;
- else if (j->transaction_next)
- hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
- else
- hashmap_remove_value(m->transaction_jobs, j->unit, j);
-
- if (j->transaction_next)
- j->transaction_next->transaction_prev = j->transaction_prev;
-
- j->transaction_prev = j->transaction_next = NULL;
-
- while (j->subject_list)
- job_dependency_free(j->subject_list);
-
- while (j->object_list) {
- Job *other = j->object_list->matters ? j->object_list->subject : NULL;
-
- job_dependency_free(j->object_list);
-
- if (other && delete_dependencies) {
- log_debug("Deleting job %s/%s as dependency of job %s/%s",
- other->unit->id, job_type_to_string(other->type),
- j->unit->id, job_type_to_string(j->type));
- transaction_delete_job(m, other, delete_dependencies);
- }
- }
-}
-
-static int transaction_add_job_and_dependencies(
- Manager *m,
- JobType type,
- Unit *unit,
- Job *by,
- bool matters,
- bool override,
- bool conflicts,
- bool ignore_requirements,
- bool ignore_order,
- DBusError *e,
- Job **_ret) {
- Job *ret;
- Iterator i;
- Unit *dep;
- int r;
- bool is_new;
-
- assert(m);
- assert(type < _JOB_TYPE_MAX);
- assert(unit);
-
- /* log_debug("Pulling in %s/%s from %s/%s", */
- /* unit->id, job_type_to_string(type), */
- /* by ? by->unit->id : "NA", */
- /* by ? job_type_to_string(by->type) : "NA"); */
-
- if (unit->load_state != UNIT_LOADED &&
- unit->load_state != UNIT_ERROR &&
- unit->load_state != UNIT_MASKED) {
- dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->id);
- return -EINVAL;
- }
-
- if (type != JOB_STOP && unit->load_state == UNIT_ERROR) {
- dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
- "Unit %s failed to load: %s. "
- "See system logs and 'systemctl status %s' for details.",
- unit->id,
- strerror(-unit->load_error),
- unit->id);
- return -EINVAL;
- }
-
- if (type != JOB_STOP && unit->load_state == UNIT_MASKED) {
- dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->id);
- return -EINVAL;
- }
-
- if (!unit_job_is_applicable(unit, type)) {
- dbus_set_error(e, BUS_ERROR_JOB_TYPE_NOT_APPLICABLE, "Job type %s is not applicable for unit %s.", job_type_to_string(type), unit->id);
- return -EBADR;
- }
-
- /* First add the job. */
- if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
- return -ENOMEM;
-
- ret->ignore_order = ret->ignore_order || ignore_order;
-
- /* Then, add a link to the job. */
- if (!job_dependency_new(by, ret, matters, conflicts))
- return -ENOMEM;
-
- if (is_new && !ignore_requirements) {
- Set *following;
-
- /* If we are following some other unit, make sure we
- * add all dependencies of everybody following. */
- if (unit_following_set(ret->unit, &following) > 0) {
- SET_FOREACH(dep, following, i)
- if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
-
- if (e)
- dbus_error_free(e);
- }
-
- set_free(following);
- }
-
- /* Finally, recursively add in all dependencies. */
- if (type == JOB_START || type == JOB_RELOAD_OR_START) {
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRES], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
- if (r != -EBADR)
- goto fail;
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_BIND_TO], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
-
- if (r != -EBADR)
- goto fail;
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_WANTS], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUISITE], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
-
- if (r != -EBADR)
- goto fail;
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_CONFLICTS], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
-
- if (r != -EBADR)
- goto fail;
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_CONFLICTED_BY], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
- log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
-
- if (e)
- dbus_error_free(e);
- }
-
- }
-
- if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRED_BY], i)
- if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
-
- if (r != -EBADR)
- goto fail;
-
- if (e)
- dbus_error_free(e);
- }
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_BOUND_BY], i)
- if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
-
- if (r != -EBADR)
- goto fail;
-
- if (e)
- dbus_error_free(e);
- }
- }
-
- if (type == JOB_RELOAD || type == JOB_RELOAD_OR_START) {
-
- SET_FOREACH(dep, ret->unit->dependencies[UNIT_PROPAGATE_RELOAD_TO], i) {
- r = transaction_add_job_and_dependencies(m, JOB_RELOAD, dep, ret, false, override, false, false, ignore_order, e, NULL);
-
- if (r < 0) {
- log_warning("Cannot add dependency reload job for unit %s, ignoring: %s", dep->id, bus_error(e, r));
-
- if (e)
- dbus_error_free(e);
- }
- }
- }
-
- /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
- }
-
- if (_ret)
- *_ret = ret;
-
- return 0;
-
-fail:
- return r;
-}
-
-static int transaction_add_isolate_jobs(Manager *m) {
- Iterator i;
- Unit *u;
- char *k;
- int r;
-
- assert(m);
-
- HASHMAP_FOREACH_KEY(u, k, m->units, i) {
-
- /* ignore aliases */
- if (u->id != k)
- continue;
-
- if (u->ignore_on_isolate)
- continue;
-
- /* No need to stop inactive jobs */
- if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->job)
- continue;
-
- /* Is there already something listed for this? */
- if (hashmap_get(m->transaction_jobs, u))
- continue;
-
- if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
- log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->id, strerror(-r));
- }
-
- return 0;
-}
-
-int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
- int r;
- Job *ret;
-
- assert(m);
- assert(type < _JOB_TYPE_MAX);
- assert(unit);
- assert(mode < _JOB_MODE_MAX);
-
- if (mode == JOB_ISOLATE && type != JOB_START) {
- dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
- return -EINVAL;
- }
-
- if (mode == JOB_ISOLATE && !unit->allow_isolate) {
- dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
- return -EPERM;
- }
-
- log_debug("Trying to enqueue job %s/%s/%s", unit->id, job_type_to_string(type), job_mode_to_string(mode));
-
- if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
- mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
- mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
- transaction_abort(m);
- return r;
- }
-
- if (mode == JOB_ISOLATE)
- if ((r = transaction_add_isolate_jobs(m)) < 0) {
- transaction_abort(m);
- return r;
- }
-
- if ((r = transaction_activate(m, mode, e)) < 0)
- return r;
-
- log_debug("Enqueued job %s/%s as %u", unit->id, job_type_to_string(type), (unsigned) ret->id);
-
- if (_ret)
- *_ret = ret;
-
- return 0;
-}
-
-int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
- Unit *unit;
- int r;
-
- assert(m);
- assert(type < _JOB_TYPE_MAX);
- assert(name);
- assert(mode < _JOB_MODE_MAX);
-
- if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
- return r;
-
- return manager_add_job(m, type, unit, mode, override, e, _ret);
-}
-
-Job *manager_get_job(Manager *m, uint32_t id) {
- assert(m);
-
- return hashmap_get(m->jobs, UINT32_TO_PTR(id));
-}
-
-Unit *manager_get_unit(Manager *m, const char *name) {
- assert(m);
- assert(name);
-
- return hashmap_get(m->units, name);
-}
-
-unsigned manager_dispatch_load_queue(Manager *m) {
- Unit *u;
- unsigned n = 0;
-
- assert(m);
-
- /* Make sure we are not run recursively */
- if (m->dispatching_load_queue)
- return 0;
-
- m->dispatching_load_queue = true;
-
- /* Dispatches the load queue. Takes a unit from the queue and
- * tries to load its data until the queue is empty */
-
- while ((u = m->load_queue)) {
- assert(u->in_load_queue);
-
- unit_load(u);
- n++;
- }
-
- m->dispatching_load_queue = false;
- return n;
-}
-
-int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
- Unit *ret;
- UnitType t;
- int r;
-
- assert(m);
- assert(name || path);
-
- /* This will prepare the unit for loading, but not actually
- * load anything from disk. */
-
- if (path && !is_path(path)) {
- dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
- return -EINVAL;
- }
-
- if (!name)
- name = file_name_from_path(path);
-
- t = unit_name_to_type(name);
-
- if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid_no_type(name, false)) {
- dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
- return -EINVAL;
- }
-
- ret = manager_get_unit(m, name);
- if (ret) {
- *_ret = ret;
- return 1;
- }
-
- ret = unit_new(m, unit_vtable[t]->object_size);
- if (!ret)
- return -ENOMEM;
-
- if (path) {
- ret->fragment_path = strdup(path);
- if (!ret->fragment_path) {
- unit_free(ret);
- return -ENOMEM;
- }
- }
-
- if ((r = unit_add_name(ret, name)) < 0) {
- unit_free(ret);
- return r;
- }
-
- unit_add_to_load_queue(ret);
- unit_add_to_dbus_queue(ret);
- unit_add_to_gc_queue(ret);
-
- if (_ret)
- *_ret = ret;
-
- return 0;
-}
-
-int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
- int r;
-
- assert(m);
-
- /* This will load the service information files, but not actually
- * start any services or anything. */
-
- if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
- return r;
-
- manager_dispatch_load_queue(m);
-
- if (_ret)
- *_ret = unit_follow_merge(*_ret);
-
- return 0;
-}
-
-void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
- Iterator i;
- Job *j;
-
- assert(s);
- assert(f);
-
- HASHMAP_FOREACH(j, s->jobs, i)
- job_dump(j, f, prefix);
-}
-
-void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
- Iterator i;
- Unit *u;
- const char *t;
-
- assert(s);
- assert(f);
-
- HASHMAP_FOREACH_KEY(u, t, s->units, i)
- if (u->id == t)
- unit_dump(u, f, prefix);
-}
-
-void manager_clear_jobs(Manager *m) {
- Job *j;
-
- assert(m);
-
- transaction_abort(m);
-
- while ((j = hashmap_first(m->jobs)))
- job_finish_and_invalidate(j, JOB_CANCELED);
-}
-
-unsigned manager_dispatch_run_queue(Manager *m) {
- Job *j;
- unsigned n = 0;
-
- if (m->dispatching_run_queue)
- return 0;
-
- m->dispatching_run_queue = true;
-
- while ((j = m->run_queue)) {
- assert(j->installed);
- assert(j->in_run_queue);
-
- job_run_and_invalidate(j);
- n++;
- }
-
- m->dispatching_run_queue = false;
- return n;
-}
-
-unsigned manager_dispatch_dbus_queue(Manager *m) {
- Job *j;
- Unit *u;
- unsigned n = 0;
-
- assert(m);
-
- if (m->dispatching_dbus_queue)
- return 0;
-
- m->dispatching_dbus_queue = true;
-
- while ((u = m->dbus_unit_queue)) {
- assert(u->in_dbus_queue);
-
- bus_unit_send_change_signal(u);
- n++;
- }
-
- while ((j = m->dbus_job_queue)) {
- assert(j->in_dbus_queue);
-
- bus_job_send_change_signal(j);
- n++;
- }
-
- m->dispatching_dbus_queue = false;
- return n;
-}
-
-static int manager_process_notify_fd(Manager *m) {
- ssize_t n;
-
- assert(m);
-
- for (;;) {
- char buf[4096];
- struct msghdr msghdr;
- struct iovec iovec;
- struct ucred *ucred;
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
- } control;
- Unit *u;
- char **tags;
-
- zero(iovec);
- iovec.iov_base = buf;
- iovec.iov_len = sizeof(buf)-1;
-
- zero(control);
- zero(msghdr);
- msghdr.msg_iov = &iovec;
- msghdr.msg_iovlen = 1;
- msghdr.msg_control = &control;
- msghdr.msg_controllen = sizeof(control);
-
- if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
- if (n >= 0)
- return -EIO;
-
- if (errno == EAGAIN || errno == EINTR)
- break;
-
- return -errno;
- }
-
- if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
- control.cmsghdr.cmsg_level != SOL_SOCKET ||
- control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
- control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
- log_warning("Received notify message without credentials. Ignoring.");
- continue;
- }
-
- ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
-
- if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
- if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
- log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
- continue;
- }
-
- assert((size_t) n < sizeof(buf));
- buf[n] = 0;
- if (!(tags = strv_split(buf, "\n\r")))
- return -ENOMEM;
-
- log_debug("Got notification message for unit %s", u->id);
-
- if (UNIT_VTABLE(u)->notify_message)
- UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
-
- strv_free(tags);
- }
-
- return 0;
-}
-
-static int manager_dispatch_sigchld(Manager *m) {
- assert(m);
-
- for (;;) {
- siginfo_t si;
- Unit *u;
- int r;
-
- zero(si);
-
- /* First we call waitd() for a PID and do not reap the
- * zombie. That way we can still access /proc/$PID for
- * it while it is a zombie. */
- if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
-
- if (errno == ECHILD)
- break;
-
- if (errno == EINTR)
- continue;
-
- return -errno;
- }
-
- if (si.si_pid <= 0)
- break;
-
- if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
- char *name = NULL;
-
- get_process_comm(si.si_pid, &name);
- log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
- free(name);
- }
-
- /* Let's flush any message the dying child might still
- * have queued for us. This ensures that the process
- * still exists in /proc so that we can figure out
- * which cgroup and hence unit it belongs to. */
- if ((r = manager_process_notify_fd(m)) < 0)
- return r;
-
- /* And now figure out the unit this belongs to */
- if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
- u = cgroup_unit_by_pid(m, si.si_pid);
-
- /* And now, we actually reap the zombie. */
- if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
- if (errno == EINTR)
- continue;
-
- return -errno;
- }
-
- if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
- continue;
-
- log_debug("Child %lu died (code=%s, status=%i/%s)",
- (long unsigned) si.si_pid,
- sigchld_code_to_string(si.si_code),
- si.si_status,
- strna(si.si_code == CLD_EXITED
- ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
- : signal_to_string(si.si_status)));
-
- if (!u)
- continue;
-
- log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->id);
-
- hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
- UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
- }
-
- return 0;
-}
-
-static int manager_start_target(Manager *m, const char *name, JobMode mode) {
- int r;
- DBusError error;
-
- dbus_error_init(&error);
-
- log_debug("Activating special unit %s", name);
-
- if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
- log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
-
- dbus_error_free(&error);
-
- return r;
-}
-
-static int manager_process_signal_fd(Manager *m) {
- ssize_t n;
- struct signalfd_siginfo sfsi;
- bool sigchld = false;
-
- assert(m);
-
- for (;;) {
- if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
-
- if (n >= 0)
- return -EIO;
-
- if (errno == EINTR || errno == EAGAIN)
- break;
-
- return -errno;
- }
-
- if (sfsi.ssi_pid > 0) {
- char *p = NULL;
-
- get_process_comm(sfsi.ssi_pid, &p);
-
- log_debug("Received SIG%s from PID %lu (%s).",
- signal_to_string(sfsi.ssi_signo),
- (unsigned long) sfsi.ssi_pid, strna(p));
- free(p);
- } else
- log_debug("Received SIG%s.", signal_to_string(sfsi.ssi_signo));
-
- switch (sfsi.ssi_signo) {
-
- case SIGCHLD:
- sigchld = true;
- break;
-
- case SIGTERM:
- if (m->running_as == MANAGER_SYSTEM) {
- /* This is for compatibility with the
- * original sysvinit */
- m->exit_code = MANAGER_REEXECUTE;
- break;
- }
-
- /* Fall through */
-
- case SIGINT:
- if (m->running_as == MANAGER_SYSTEM) {
- manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
- break;
- }
-
- /* Run the exit target if there is one, if not, just exit. */
- if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
- m->exit_code = MANAGER_EXIT;
- return 0;
- }
-
- break;
-
- case SIGWINCH:
- if (m->running_as == MANAGER_SYSTEM)
- manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
-
- /* This is a nop on non-init */
- break;
-
- case SIGPWR:
- if (m->running_as == MANAGER_SYSTEM)
- manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
-
- /* This is a nop on non-init */
- break;
-
- case SIGUSR1: {
- Unit *u;
-
- u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
-
- if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
- log_info("Trying to reconnect to bus...");
- bus_init(m, true);
- }
-
- if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
- log_info("Loading D-Bus service...");
- manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
- }
-
- break;
- }
-
- case SIGUSR2: {
- FILE *f;
- char *dump = NULL;
- size_t size;
-
- if (!(f = open_memstream(&dump, &size))) {
- log_warning("Failed to allocate memory stream.");
- break;
- }
-
- manager_dump_units(m, f, "\t");
- manager_dump_jobs(m, f, "\t");
-
- if (ferror(f)) {
- fclose(f);
- free(dump);
- log_warning("Failed to write status stream");
- break;
- }
-
- fclose(f);
- log_dump(LOG_INFO, dump);
- free(dump);
-
- break;
- }
-
- case SIGHUP:
- m->exit_code = MANAGER_RELOAD;
- break;
-
- default: {
-
- /* Starting SIGRTMIN+0 */
- static const char * const target_table[] = {
- [0] = SPECIAL_DEFAULT_TARGET,
- [1] = SPECIAL_RESCUE_TARGET,
- [2] = SPECIAL_EMERGENCY_TARGET,
- [3] = SPECIAL_HALT_TARGET,
- [4] = SPECIAL_POWEROFF_TARGET,
- [5] = SPECIAL_REBOOT_TARGET,
- [6] = SPECIAL_KEXEC_TARGET
- };
-
- /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
- static const ManagerExitCode code_table[] = {
- [0] = MANAGER_HALT,
- [1] = MANAGER_POWEROFF,
- [2] = MANAGER_REBOOT,
- [3] = MANAGER_KEXEC
- };
-
- if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
- (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
- int idx = (int) sfsi.ssi_signo - SIGRTMIN;
- manager_start_target(m, target_table[idx],
- (idx == 1 || idx == 2) ? JOB_ISOLATE : JOB_REPLACE);
- break;
- }
-
- if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
- (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
- m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
- break;
- }
-
- switch (sfsi.ssi_signo - SIGRTMIN) {
-
- case 20:
- log_debug("Enabling showing of status.");
- manager_set_show_status(m, true);
- break;
-
- case 21:
- log_debug("Disabling showing of status.");
- manager_set_show_status(m, false);
- break;
-
- case 22:
- log_set_max_level(LOG_DEBUG);
- log_notice("Setting log level to debug.");
- break;
-
- case 23:
- log_set_max_level(LOG_INFO);
- log_notice("Setting log level to info.");
- break;
-
- case 26:
- log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
- log_notice("Setting log target to journal-or-kmsg.");
- break;
-
- case 27:
- log_set_target(LOG_TARGET_CONSOLE);
- log_notice("Setting log target to console.");
- break;
-
- case 28:
- log_set_target(LOG_TARGET_KMSG);
- log_notice("Setting log target to kmsg.");
- break;
-
- case 29:
- log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
- log_notice("Setting log target to syslog-or-kmsg.");
- break;
-
- default:
- log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo));
- }
- }
- }
- }
-
- if (sigchld)
- return manager_dispatch_sigchld(m);
-
- return 0;
-}
-
-static int process_event(Manager *m, struct epoll_event *ev) {
- int r;
- Watch *w;
-
- assert(m);
- assert(ev);
-
- assert_se(w = ev->data.ptr);
-
- if (w->type == WATCH_INVALID)
- return 0;
-
- switch (w->type) {
-
- case WATCH_SIGNAL:
-
- /* An incoming signal? */
- if (ev->events != EPOLLIN)
- return -EINVAL;
-
- if ((r = manager_process_signal_fd(m)) < 0)
- return r;
-
- break;
-
- case WATCH_NOTIFY:
-
- /* An incoming daemon notification event? */
- if (ev->events != EPOLLIN)
- return -EINVAL;
-
- if ((r = manager_process_notify_fd(m)) < 0)
- return r;
-
- break;
-
- case WATCH_FD:
-
- /* Some fd event, to be dispatched to the units */
- UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
- break;
-
- case WATCH_UNIT_TIMER:
- case WATCH_JOB_TIMER: {
- uint64_t v;
- ssize_t k;
-
- /* Some timer event, to be dispatched to the units */
- if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
-
- if (k < 0 && (errno == EINTR || errno == EAGAIN))
- break;
-
- return k < 0 ? -errno : -EIO;
- }
-
- if (w->type == WATCH_UNIT_TIMER)
- UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
- else
- job_timer_event(w->data.job, v, w);
- break;
- }
-
- case WATCH_MOUNT:
- /* Some mount table change, intended for the mount subsystem */
- mount_fd_event(m, ev->events);
- break;
-
- case WATCH_SWAP:
- /* Some swap table change, intended for the swap subsystem */
- swap_fd_event(m, ev->events);
- break;
-
- case WATCH_UDEV:
- /* Some notification from udev, intended for the device subsystem */
- device_fd_event(m, ev->events);
- break;
-
- case WATCH_DBUS_WATCH:
- bus_watch_event(m, w, ev->events);
- break;
-
- case WATCH_DBUS_TIMEOUT:
- bus_timeout_event(m, w, ev->events);
- break;
-
- default:
- log_error("event type=%i", w->type);
- assert_not_reached("Unknown epoll event type.");
- }
-
- return 0;
-}
-
-int manager_loop(Manager *m) {
- int r;
- int wait_msec = -1;
-
- RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
-
- assert(m);
- m->exit_code = MANAGER_RUNNING;
-
- /* Release the path cache */
- set_free_free(m->unit_path_cache);
- m->unit_path_cache = NULL;
-
- manager_check_finished(m);
-
- /* There might still be some zombies hanging around from
- * before we were exec()'ed. Leat's reap them */
- r = manager_dispatch_sigchld(m);
- if (r < 0)
- return r;
-
- /* Sleep for half the watchdog time */
- if (m->runtime_watchdog > 0 && m->running_as == MANAGER_SYSTEM) {
- wait_msec = (int) (m->runtime_watchdog / 2 / USEC_PER_MSEC);
- if (wait_msec <= 0)
- wait_msec = 1;
- }
-
- while (m->exit_code == MANAGER_RUNNING) {
- struct epoll_event event;
- int n;
-
- if (wait_msec >= 0)
- watchdog_ping();
-
- if (!ratelimit_test(&rl)) {
- /* Yay, something is going seriously wrong, pause a little */
- log_warning("Looping too fast. Throttling execution a little.");
- sleep(1);
- continue;
- }
-
- if (manager_dispatch_load_queue(m) > 0)
- continue;
-
- if (manager_dispatch_run_queue(m) > 0)
- continue;
-
- if (bus_dispatch(m) > 0)
- continue;
-
- if (manager_dispatch_cleanup_queue(m) > 0)
- continue;
-
- if (manager_dispatch_gc_queue(m) > 0)
- continue;
-
- if (manager_dispatch_dbus_queue(m) > 0)
- continue;
-
- if (swap_dispatch_reload(m) > 0)
- continue;
-
- n = epoll_wait(m->epoll_fd, &event, 1, wait_msec);
- if (n < 0) {
-
- if (errno == EINTR)
- continue;
-
- return -errno;
- } else if (n == 0)
- continue;
-
- assert(n == 1);
-
- r = process_event(m, &event);
- if (r < 0)
- return r;
- }
-
- return m->exit_code;
-}
-
-int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
- char *n;
- Unit *u;
-
- assert(m);
- assert(s);
- assert(_u);
-
- if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
- return -EINVAL;
-
- if (!(n = bus_path_unescape(s+31)))
- return -ENOMEM;
-
- u = manager_get_unit(m, n);
- free(n);
-
- if (!u)
- return -ENOENT;
-
- *_u = u;
-
- return 0;
-}
-
-int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
- Job *j;
- unsigned id;
- int r;
-
- assert(m);
- assert(s);
- assert(_j);
-
- if (!startswith(s, "/org/freedesktop/systemd1/job/"))
- return -EINVAL;
-
- if ((r = safe_atou(s + 30, &id)) < 0)
- return r;
-
- if (!(j = manager_get_job(m, id)))
- return -ENOENT;
-
- *_j = j;
-
- return 0;
-}
-
-void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
-
-#ifdef HAVE_AUDIT
- char *p;
-
- if (m->audit_fd < 0)
- return;
-
- /* Don't generate audit events if the service was already
- * started and we're just deserializing */
- if (m->n_reloading > 0)
- return;
-
- if (m->running_as != MANAGER_SYSTEM)
- return;
-
- if (u->type != UNIT_SERVICE)
- return;
-
- if (!(p = unit_name_to_prefix_and_instance(u->id))) {
- log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
- return;
- }
-
- if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
- log_warning("Failed to send audit message: %m");
-
- if (errno == EPERM) {
- /* We aren't allowed to send audit messages?
- * Then let's not retry again, to avoid
- * spamming the user with the same and same
- * messages over and over. */
-
- audit_close(m->audit_fd);
- m->audit_fd = -1;
- }
- }
-
- free(p);
-#endif
-
-}
-
-void manager_send_unit_plymouth(Manager *m, Unit *u) {
- int fd = -1;
- union sockaddr_union sa;
- int n = 0;
- char *message = NULL;
-
- /* Don't generate plymouth events if the service was already
- * started and we're just deserializing */
- if (m->n_reloading > 0)
- return;
-
- if (m->running_as != MANAGER_SYSTEM)
- return;
-
- if (u->type != UNIT_SERVICE &&
- u->type != UNIT_MOUNT &&
- u->type != UNIT_SWAP)
- return;
-
- /* We set SOCK_NONBLOCK here so that we rather drop the
- * message then wait for plymouth */
- if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
- log_error("socket() failed: %m");
- return;
- }
-
- zero(sa);
- sa.sa.sa_family = AF_UNIX;
- strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
- if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
-
- if (errno != EPIPE &&
- errno != EAGAIN &&
- errno != ENOENT &&
- errno != ECONNREFUSED &&
- errno != ECONNRESET &&
- errno != ECONNABORTED)
- log_error("connect() failed: %m");
-
- goto finish;
- }
-
- if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->id) + 1), u->id, &n) < 0) {
- log_error("Out of memory");
- goto finish;
- }
-
- errno = 0;
- if (write(fd, message, n + 1) != n + 1) {
-
- if (errno != EPIPE &&
- errno != EAGAIN &&
- errno != ENOENT &&
- errno != ECONNREFUSED &&
- errno != ECONNRESET &&
- errno != ECONNABORTED)
- log_error("Failed to write Plymouth message: %m");
-
- goto finish;
- }
-
-finish:
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- free(message);
-}
-
-void manager_dispatch_bus_name_owner_changed(
- Manager *m,
- const char *name,
- const char* old_owner,
- const char *new_owner) {
-
- Unit *u;
-
- assert(m);
- assert(name);
-
- if (!(u = hashmap_get(m->watch_bus, name)))
- return;
-
- UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
-}
-
-void manager_dispatch_bus_query_pid_done(
- Manager *m,
- const char *name,
- pid_t pid) {
-
- Unit *u;
-
- assert(m);
- assert(name);
- assert(pid >= 1);
-
- if (!(u = hashmap_get(m->watch_bus, name)))
- return;
-
- UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
-}
-
-int manager_open_serialization(Manager *m, FILE **_f) {
- char *path = NULL;
- mode_t saved_umask;
- int fd;
- FILE *f;
-
- assert(_f);
-
- if (m->running_as == MANAGER_SYSTEM)
- asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
- else
- asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
-
- if (!path)
- return -ENOMEM;
-
- saved_umask = umask(0077);
- fd = mkostemp(path, O_RDWR|O_CLOEXEC);
- umask(saved_umask);
-
- if (fd < 0) {
- free(path);
- return -errno;
- }
-
- unlink(path);
-
- log_debug("Serializing state to %s", path);
- free(path);
-
- if (!(f = fdopen(fd, "w+")))
- return -errno;
-
- *_f = f;
-
- return 0;
-}
-
-int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
- Iterator i;
- Unit *u;
- const char *t;
- int r;
-
- assert(m);
- assert(f);
- assert(fds);
-
- m->n_reloading ++;
-
- fprintf(f, "current-job-id=%i\n", m->current_job_id);
- fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
-
- dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
- dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
- dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
-
- fputc('\n', f);
-
- HASHMAP_FOREACH_KEY(u, t, m->units, i) {
- if (u->id != t)
- continue;
-
- if (!unit_can_serialize(u))
- continue;
-
- /* Start marker */
- fputs(u->id, f);
- fputc('\n', f);
-
- if ((r = unit_serialize(u, f, fds)) < 0) {
- m->n_reloading --;
- return r;
- }
- }
-
- assert(m->n_reloading > 0);
- m->n_reloading --;
-
- if (ferror(f))
- return -EIO;
-
- r = bus_fdset_add_all(m, fds);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
- int r = 0;
-
- assert(m);
- assert(f);
-
- log_debug("Deserializing state...");
-
- m->n_reloading ++;
-
- for (;;) {
- char line[LINE_MAX], *l;
-
- if (!fgets(line, sizeof(line), f)) {
- if (feof(f))
- r = 0;
- else
- r = -errno;
-
- goto finish;
- }
-
- char_array_0(line);
- l = strstrip(line);
-
- if (l[0] == 0)
- break;
-
- if (startswith(l, "current-job-id=")) {
- uint32_t id;
-
- if (safe_atou32(l+15, &id) < 0)
- log_debug("Failed to parse current job id value %s", l+15);
- else
- m->current_job_id = MAX(m->current_job_id, id);
- } else if (startswith(l, "taint-usr=")) {
- int b;
-
- if ((b = parse_boolean(l+10)) < 0)
- log_debug("Failed to parse taint /usr flag %s", l+10);
- else
- m->taint_usr = m->taint_usr || b;
- } else if (startswith(l, "initrd-timestamp="))
- dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
- else if (startswith(l, "startup-timestamp="))
- dual_timestamp_deserialize(l+18, &m->startup_timestamp);
- else if (startswith(l, "finish-timestamp="))
- dual_timestamp_deserialize(l+17, &m->finish_timestamp);
- else
- log_debug("Unknown serialization item '%s'", l);
- }
-
- for (;;) {
- Unit *u;
- char name[UNIT_NAME_MAX+2];
-
- /* Start marker */
- if (!fgets(name, sizeof(name), f)) {
- if (feof(f))
- r = 0;
- else
- r = -errno;
-
- goto finish;
- }
-
- char_array_0(name);
-
- if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
- goto finish;
-
- if ((r = unit_deserialize(u, f, fds)) < 0)
- goto finish;
- }
-
-finish:
- if (ferror(f)) {
- r = -EIO;
- goto finish;
- }
-
- assert(m->n_reloading > 0);
- m->n_reloading --;
-
- return r;
-}
-
-int manager_reload(Manager *m) {
- int r, q;
- FILE *f;
- FDSet *fds;
-
- assert(m);
-
- if ((r = manager_open_serialization(m, &f)) < 0)
- return r;
-
- m->n_reloading ++;
-
- if (!(fds = fdset_new())) {
- m->n_reloading --;
- r = -ENOMEM;
- goto finish;
- }
-
- if ((r = manager_serialize(m, f, fds)) < 0) {
- m->n_reloading --;
- goto finish;
- }
-
- if (fseeko(f, 0, SEEK_SET) < 0) {
- m->n_reloading --;
- r = -errno;
- goto finish;
- }
-
- /* From here on there is no way back. */
- manager_clear_jobs_and_units(m);
- manager_undo_generators(m);
-
- /* Find new unit paths */
- lookup_paths_free(&m->lookup_paths);
- if ((q = lookup_paths_init(&m->lookup_paths, m->running_as, true)) < 0)
- r = q;
-
- manager_run_generators(m);
-
- manager_build_unit_path_cache(m);
-
- /* First, enumerate what we can from all config files */
- if ((q = manager_enumerate(m)) < 0)
- r = q;
-
- /* Second, deserialize our stored data */
- if ((q = manager_deserialize(m, f, fds)) < 0)
- r = q;
-
- fclose(f);
- f = NULL;
-
- /* Third, fire things up! */
- if ((q = manager_coldplug(m)) < 0)
- r = q;
-
- assert(m->n_reloading > 0);
- m->n_reloading--;
-
-finish:
- if (f)
- fclose(f);
-
- if (fds)
- fdset_free(fds);
-
- return r;
-}
-
-bool manager_is_booting_or_shutting_down(Manager *m) {
- Unit *u;
-
- assert(m);
-
- /* Is the initial job still around? */
- if (manager_get_job(m, m->default_unit_job_id))
- return true;
-
- /* Is there a job for the shutdown target? */
- u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET);
- if (u)
- return !!u->job;
-
- return false;
-}
-
-void manager_reset_failed(Manager *m) {
- Unit *u;
- Iterator i;
-
- assert(m);
-
- HASHMAP_FOREACH(u, m->units, i)
- unit_reset_failed(u);
-}
-
-bool manager_unit_pending_inactive(Manager *m, const char *name) {
- Unit *u;
-
- assert(m);
- assert(name);
-
- /* Returns true if the unit is inactive or going down */
- if (!(u = manager_get_unit(m, name)))
- return true;
-
- return unit_pending_inactive(u);
-}
-
-void manager_check_finished(Manager *m) {
- char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
- usec_t kernel_usec = 0, initrd_usec = 0, userspace_usec = 0, total_usec = 0;
-
- assert(m);
-
- if (dual_timestamp_is_set(&m->finish_timestamp))
- return;
-
- if (hashmap_size(m->jobs) > 0)
- return;
-
- dual_timestamp_get(&m->finish_timestamp);
-
- if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
-
- userspace_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
- total_usec = m->finish_timestamp.monotonic;
-
- if (dual_timestamp_is_set(&m->initrd_timestamp)) {
-
- kernel_usec = m->initrd_timestamp.monotonic;
- initrd_usec = m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic;
-
- log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
- format_timespan(kernel, sizeof(kernel), kernel_usec),
- format_timespan(initrd, sizeof(initrd), initrd_usec),
- format_timespan(userspace, sizeof(userspace), userspace_usec),
- format_timespan(sum, sizeof(sum), total_usec));
- } else {
- kernel_usec = m->startup_timestamp.monotonic;
- initrd_usec = 0;
-
- log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
- format_timespan(kernel, sizeof(kernel), kernel_usec),
- format_timespan(userspace, sizeof(userspace), userspace_usec),
- format_timespan(sum, sizeof(sum), total_usec));
- }
- } else {
- userspace_usec = initrd_usec = kernel_usec = 0;
- total_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
-
- log_debug("Startup finished in %s.",
- format_timespan(sum, sizeof(sum), total_usec));
- }
-
- bus_broadcast_finished(m, kernel_usec, initrd_usec, userspace_usec, total_usec);
-
- sd_notifyf(false,
- "READY=1\nSTATUS=Startup finished in %s.",
- format_timespan(sum, sizeof(sum), total_usec));
-}
-
-void manager_run_generators(Manager *m) {
- DIR *d = NULL;
- const char *generator_path;
- const char *argv[3];
- mode_t u;
-
- assert(m);
-
- generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
- if (!(d = opendir(generator_path))) {
-
- if (errno == ENOENT)
- return;
-
- log_error("Failed to enumerate generator directory: %m");
- return;
- }
-
- if (!m->generator_unit_path) {
- const char *p;
- char user_path[] = "/tmp/systemd-generator-XXXXXX";
-
- if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
- p = "/run/systemd/generator";
-
- if (mkdir_p(p, 0755) < 0) {
- log_error("Failed to create generator directory: %m");
- goto finish;
- }
-
- } else {
- if (!(p = mkdtemp(user_path))) {
- log_error("Failed to create generator directory: %m");
- goto finish;
- }
- }
-
- if (!(m->generator_unit_path = strdup(p))) {
- log_error("Failed to allocate generator unit path.");
- goto finish;
- }
- }
-
- argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
- argv[1] = m->generator_unit_path;
- argv[2] = NULL;
-
- u = umask(0022);
- execute_directory(generator_path, d, (char**) argv);
- umask(u);
-
- if (rmdir(m->generator_unit_path) >= 0) {
- /* Uh? we were able to remove this dir? I guess that
- * means the directory was empty, hence let's shortcut
- * this */
-
- free(m->generator_unit_path);
- m->generator_unit_path = NULL;
- goto finish;
- }
-
- if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
- char **l;
-
- if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
- log_error("Failed to add generator directory to unit search path: %m");
- goto finish;
- }
-
- strv_free(m->lookup_paths.unit_path);
- m->lookup_paths.unit_path = l;
-
- log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
- }
-
-finish:
- if (d)
- closedir(d);
-}
-
-void manager_undo_generators(Manager *m) {
- assert(m);
-
- if (!m->generator_unit_path)
- return;
-
- strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
- rm_rf(m->generator_unit_path, false, true, false);
-
- free(m->generator_unit_path);
- m->generator_unit_path = NULL;
-}
-
-int manager_set_default_controllers(Manager *m, char **controllers) {
- char **l;
-
- assert(m);
-
- if (!(l = strv_copy(controllers)))
- return -ENOMEM;
-
- strv_free(m->default_controllers);
- m->default_controllers = l;
-
- return 0;
-}
-
-void manager_recheck_journal(Manager *m) {
- Unit *u;
-
- assert(m);
-
- if (m->running_as != MANAGER_SYSTEM)
- return;
-
- u = manager_get_unit(m, SPECIAL_JOURNALD_SOCKET);
- if (u && SOCKET(u)->state != SOCKET_RUNNING) {
- log_close_journal();
- return;
- }
-
- u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE);
- if (u && SERVICE(u)->state != SERVICE_RUNNING) {
- log_close_journal();
- return;
- }
-
- /* Hmm, OK, so the socket is fully up and the service is up
- * too, then let's make use of the thing. */
- log_open();
-}
-
-void manager_set_show_status(Manager *m, bool b) {
- assert(m);
-
- if (m->running_as != MANAGER_SYSTEM)
- return;
-
- m->show_status = b;
-
- if (b)
- touch("/run/systemd/show-status");
- else
- unlink("/run/systemd/show-status");
-}
-
-bool manager_get_show_status(Manager *m) {
- assert(m);
-
- if (m->running_as != MANAGER_SYSTEM)
- return false;
-
- if (m->show_status)
- return true;
-
- /* If Plymouth is running make sure we show the status, so
- * that there's something nice to see when people press Esc */
-
- return plymouth_running();
-}
-
-static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
- [MANAGER_SYSTEM] = "system",
- [MANAGER_USER] = "user"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);
~ianmdlvl / elogind.git / blobdiff