X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=manager.c;h=cf1c1481c12d32859dd6a2449dbac94a9ed2df8c;hp=4f389793559e77a28d57118babe9326d0a606c07;hb=db06e3b6a5254ec247de5bc1a1b6a8670c2f4b2b;hpb=e14140036227901bd64833559bab70c111c651a5 diff --git a/manager.c b/manager.c index 4f3897935..cf1c1481c 100644 --- a/manager.c +++ b/manager.c @@ -27,10 +27,16 @@ #include #include #include +#include #include #include #include #include +#include +#include +#include +#include +#include #include "manager.h" #include "hashmap.h" @@ -39,26 +45,63 @@ #include "log.h" #include "util.h" #include "ratelimit.h" +#include "cgroup.h" +#include "mount-setup.h" +#include "utmp-wtmp.h" +#include "unit-name.h" +#include "dbus-unit.h" +#include "dbus-job.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 (5*USEC_PER_SEC) + +static int enable_special_signals(Manager *m) { + char 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)) < 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); - assert_se(reset_all_signal_handlers() == 0); + /* 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); assert_se(sigaddset(&mask, SIGCHLD) == 0); - assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */ - assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */ assert_se(sigaddset(&mask, SIGTERM) == 0); assert_se(sigaddset(&mask, SIGHUP) == 0); assert_se(sigaddset(&mask, SIGUSR1) == 0); assert_se(sigaddset(&mask, SIGUSR2) == 0); - assert_se(sigaddset(&mask, SIGPIPE) == 0); - assert_se(sigaddset(&mask, SIGPWR) == 0); - assert_se(sigaddset(&mask, SIGTTIN) == 0); + assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */ + assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */ + assert_se(sigaddset(&mask, SIGPWR) == 0); /* Some kernel drivers and upsd send us this on power failure */ assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); m->signal_watch.type = WATCH_SIGNAL; @@ -72,15 +115,8 @@ static int manager_setup_signals(Manager *m) { if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0) return -errno; - if (m->running_as == MANAGER_INIT) { - /* Enable that we get SIGINT on control-alt-del */ - if (reboot(RB_DISABLE_CAD) < 0) - log_warning("Failed to enable ctrl-alt-del handling: %s", strerror(errno)); - - /* Enable that we get SIGWINCH on kbrequest */ - if (ioctl(0, KDSIGACCEPT, SIGWINCH) < 0) - log_warning("Failed to enable kbrequest handling: %s", strerror(errno)); - } + if (m->running_as == MANAGER_INIT) + return enable_special_signals(m); return 0; } @@ -191,6 +227,7 @@ fail: static int manager_find_paths(Manager *m) { const char *e; char *t; + assert(m); /* First priority is whatever has been passed to us via env @@ -230,10 +267,24 @@ static int manager_find_paths(Manager *m) { NULL))) return -ENOMEM; } + + if ((e = getenv("SYSTEMD_SYSVRCND_PATH"))) + if (!(m->sysvrcnd_path = split_path_and_make_absolute(e))) + return -ENOMEM; + + if (strv_isempty(m->sysvrcnd_path)) { + strv_free(m->sysvrcnd_path); + + if (!(m->sysvrcnd_path = strv_new( + SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */ + NULL))) + return -ENOMEM; + } } strv_uniq(m->unit_path); strv_uniq(m->sysvinit_path); + strv_uniq(m->sysvrcnd_path); assert(!strv_isempty(m->unit_path)); if (!(t = strv_join(m->unit_path, "\n\t"))) @@ -251,16 +302,38 @@ static int manager_find_paths(Manager *m) { } else log_debug("Ignoring SysV init scripts."); + if (!strv_isempty(m->sysvrcnd_path)) { + + if (!(t = strv_join(m->sysvrcnd_path, "\n\t"))) + return -ENOMEM; + + log_debug("Looking for SysV rcN.d links in:\n\t%s", t); + free(t); + } else + log_debug("Ignoring SysV rcN.d links."); + return 0; } -Manager* manager_new(void) { +int manager_new(ManagerRunningAs running_as, bool confirm_spawn, 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 NULL; + return -ENOMEM; + + m->boot_timestamp = now(CLOCK_REALTIME); - m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1; + m->running_as = running_as; + m->confirm_spawn = confirm_spawn; + m->name_data_slot = -1; + m->exit_code = _MANAGER_EXIT_CODE_INVALID; + + m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1; m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */ if (!(m->units = hashmap_new(string_hash_func, string_compare_func))) @@ -275,45 +348,160 @@ Manager* manager_new(void) { if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func))) goto fail; - if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) + if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func))) goto fail; - if (getpid() == 1) - m->running_as = MANAGER_INIT; - else if (getuid() == 0) - m->running_as = MANAGER_SYSTEM; - else - m->running_as = MANAGER_SESSION; - - log_debug("systemd running in %s mode.", manager_running_as_to_string(m->running_as)); + if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func))) + goto fail; - if (manager_find_paths(m) < 0) + if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) goto fail; - if (chdir("/") < 0) - log_warning("Failed to chdir to /: %s", strerror(errno)); + if ((r = manager_find_paths(m)) < 0) + goto fail; - /* Become a session leader if we aren't one yet. */ - setsid(); + if ((r = manager_setup_signals(m)) < 0) + goto fail; - if (manager_setup_signals(m) < 0) + if ((r = manager_setup_cgroup(m)) < 0) goto fail; - /* FIXME: this should be called only when the D-Bus bus daemon is running */ - if (bus_init(m) < 0) + /* Try to connect to the busses, if possible. */ + if ((r = bus_init_system(m)) < 0 || + (r = bus_init_api(m)) < 0) goto fail; - return m; + *_m = m; + return 0; fail: manager_free(m); - return NULL; + return r; } -void manager_free(Manager *m) { - UnitType c; - Unit *u; +static unsigned manager_dispatch_cleanup_queue(Manager *m) { + Meta *meta; + unsigned n = 0; + + assert(m); + + while ((meta = m->cleanup_queue)) { + assert(meta->in_cleanup_queue); + + unit_free(UNIT(meta)); + n++; + } + + return n; +} + +enum { + GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */ + 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->meta.gc_marker == gc_marker + GC_OFFSET_GOOD || + u->meta.gc_marker == gc_marker + GC_OFFSET_BAD || + u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH) + return; + + if (u->meta.in_cleanup_queue) + goto bad; + + if (unit_check_gc(u)) + goto good; + + u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH; + + is_bad = true; + + SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) { + unit_gc_sweep(other, gc_marker); + + if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD) + goto good; + + if (other->meta.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->meta.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->meta.gc_marker = gc_marker + GC_OFFSET_BAD; + unit_add_to_cleanup_queue(u); + return; + +good: + u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD; +} + +static unsigned manager_dispatch_gc_queue(Manager *m) { + Meta *meta; + 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 ((meta = m->gc_queue)) { + assert(meta->in_gc_queue); + + unit_gc_sweep(UNIT(meta), gc_marker); + + LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta); + meta->in_gc_queue = false; + + n++; + + if (meta->gc_marker == gc_marker + GC_OFFSET_BAD || + meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) { + log_debug("Collecting %s", meta->id); + meta->gc_marker = gc_marker + GC_OFFSET_BAD; + unit_add_to_cleanup_queue(UNIT(meta)); + } + } + + 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); @@ -322,69 +510,120 @@ void manager_free(Manager *m) { while ((u = hashmap_first(m->units))) unit_free(u); +} + +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); - bus_done(m); + /* If we reexecute ourselves, we keep the root cgroup + * around */ + manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE); + + bus_done_api(m); + bus_done_system(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(m->epoll_fd); + close_nointr_nofail(m->epoll_fd); if (m->signal_watch.fd >= 0) - close_nointr(m->signal_watch.fd); + close_nointr_nofail(m->signal_watch.fd); strv_free(m->unit_path); strv_free(m->sysvinit_path); + strv_free(m->sysvrcnd_path); + + free(m->cgroup_controller); + free(m->cgroup_hierarchy); + + hashmap_free(m->cgroup_bondings); free(m); } -int manager_coldplug(Manager *m) { - int r; +int manager_enumerate(Manager *m) { + int r = 0, q; UnitType c; - Iterator i; - Unit *u; - char *k; assert(m); - /* First, let's ask every type to load all units from - * disk/kernel that it might know */ + /* 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 ((r = unit_vtable[c]->enumerate(m)) < 0) - return r; + 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 (unit_id(u) != k) + if (u->meta.id != k) continue; if (UNIT_VTABLE(u)->coldplug) - if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0) - return r; + if ((q = UNIT_VTABLE(u)->coldplug(u)) < 0) + r = q; } - return 0; + return r; } -static void transaction_delete_job(Manager *m, Job *j) { +int manager_startup(Manager *m, FILE *serialization, FDSet *fds) { + int r, q; + + assert(m); + + /* 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; + + /* Now that the initial devices are available, let's see if we + * can write the utmp file */ + manager_write_utmp_reboot(m); + + 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); + manager_transaction_unlink_job(m, j, delete_dependencies); if (!j->installed) job_free(j); @@ -397,7 +636,7 @@ static void transaction_delete_unit(Manager *m, Unit *u) { * transaction */ while ((j = hashmap_get(m->transaction_jobs, u))) - transaction_delete_job(m, j); + transaction_delete_job(m, j, true); } static void transaction_clean_dependencies(Manager *m) { @@ -425,7 +664,7 @@ static void transaction_abort(Manager *m) { while ((j = hashmap_first(m->transaction_jobs))) if (j->installed) - transaction_delete_job(m, j); + transaction_delete_job(m, j, true); else job_free(j); @@ -478,7 +717,7 @@ static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, Job j->type = t; j->state = JOB_WAITING; - j->forced = j->forced || other->forced; + j->override = j->override || other->override; j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor; @@ -517,7 +756,7 @@ static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, Job /* Kill the other job */ other->subject_list = NULL; other->object_list = NULL; - transaction_delete_job(m, other); + transaction_delete_job(m, other, true); } static int delete_one_unmergeable_job(Manager *m, Job *j) { @@ -550,8 +789,8 @@ static int delete_one_unmergeable_job(Manager *m, Job *j) { return -ENOEXEC; /* Ok, we can drop one, so let's do so. */ - log_debug("Try to fix job merging by deleting job %s/%s", unit_id(d->unit), job_type_to_string(d->type)); - transaction_delete_job(m, d); + log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type)); + transaction_delete_job(m, d, true); return 0; } @@ -619,6 +858,46 @@ static int transaction_merge_jobs(Manager *m) { 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) && + job_type_is_redundant(k->type, unit_active_state(k->unit))) + continue; + + changes_something = true; + break; + } + + if (changes_something) + continue; + + log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.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); @@ -656,17 +935,17 @@ static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned * since smart how we are we stored our way back in * there. */ - log_debug("Found cycle on %s/%s", unit_id(j->unit), job_type_to_string(j->type)); + log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type)); for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) { - log_debug("Walked on cycle path to %s/%s", unit_id(j->unit), job_type_to_string(j->type)); + log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type)); if (!k->installed && !unit_matters_to_anchor(k->unit, k)) { /* Ok, we can drop this one, so let's * do so. */ - log_debug("Breaking order cycle by deleting job %s/%s", unit_id(k->unit), job_type_to_string(k->type)); + log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type)); transaction_delete_unit(m, k->unit); return -EAGAIN; } @@ -747,8 +1026,8 @@ static void transaction_collect_garbage(Manager *m) { if (j->object_list) continue; - log_debug("Garbage collecting job %s/%s", unit_id(j->unit), job_type_to_string(j->type)); - transaction_delete_job(m, j); + log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); + transaction_delete_job(m, j, true); again = true; break; } @@ -756,7 +1035,7 @@ static void transaction_collect_garbage(Manager *m) { } while (again); } -static int transaction_is_destructive(Manager *m, JobMode mode) { +static int transaction_is_destructive(Manager *m) { Iterator i; Job *j; @@ -815,15 +1094,15 @@ static void transaction_minimize_impact(Manager *m) { continue; if (stops_running_service) - log_debug("%s/%s would stop a running service.", unit_id(j->unit), job_type_to_string(j->type)); + log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type)); if (changes_existing_job) - log_debug("%s/%s would change existing job.", unit_id(j->unit), job_type_to_string(j->type)); + log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type)); /* Ok, let's get rid of this */ - log_debug("Deleting %s/%s to minimize impact.", unit_id(j->unit), job_type_to_string(j->type)); + log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type)); - transaction_delete_job(m, j); + transaction_delete_job(m, j, true); again = true; break; } @@ -835,7 +1114,7 @@ static void transaction_minimize_impact(Manager *m) { } while (again); } -static int transaction_apply(Manager *m, JobMode mode) { +static int transaction_apply(Manager *m) { Iterator i; Job *j; int r; @@ -908,12 +1187,15 @@ static int transaction_activate(Manager *m, JobMode mode) { * jobs if we don't have to. */ transaction_minimize_impact(m); + /* Third step: Drop redundant jobs */ + transaction_drop_redundant(m); + for (;;) { - /* Third step: Let's remove unneeded jobs that might + /* Fourth step: Let's remove unneeded jobs that might * be lurking. */ transaction_collect_garbage(m); - /* Fourth step: verify order makes sense and correct + /* Fifth step: verify order makes sense and correct * cycles if necessary and possible */ if ((r = transaction_verify_order(m, &generation)) >= 0) break; @@ -928,7 +1210,7 @@ static int transaction_activate(Manager *m, JobMode mode) { } for (;;) { - /* Fifth step: let's drop unmergeable entries if + /* Sixth step: let's drop unmergeable entries if * necessary and possible, merge entries we can * merge */ if ((r = transaction_merge_jobs(m)) >= 0) @@ -939,7 +1221,7 @@ static int transaction_activate(Manager *m, JobMode mode) { goto rollback; } - /* Sixth step: an entry got dropped, let's garbage + /* Seventh step: an entry got dropped, let's garbage * collect its dependencies. */ transaction_collect_garbage(m); @@ -947,15 +1229,18 @@ static int transaction_activate(Manager *m, JobMode mode) { * unmergeable entries ... */ } - /* Seventh step: check whether we can actually apply this */ + /* 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, mode)) < 0) { + if ((r = transaction_is_destructive(m)) < 0) { log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r)); goto rollback; } - /* Eights step: apply changes */ - if ((r = transaction_apply(m, mode)) < 0) { + /* Tenth step: apply changes */ + if ((r = transaction_apply(m)) < 0) { log_debug("Failed to apply transaction: %s", strerror(-r)); goto rollback; } @@ -970,7 +1255,7 @@ rollback: return r; } -static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool force, bool *is_new) { +static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) { Job *j, *f; int r; @@ -1001,7 +1286,7 @@ static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool f j->generation = 0; j->marker = NULL; j->matters_to_anchor = false; - j->forced = force; + j->override = override; LIST_PREPEND(Job, transaction, f, j); @@ -1013,10 +1298,12 @@ static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool f if (is_new) *is_new = true; + log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); + return j; } -void manager_transaction_unlink_job(Manager *m, Job *j) { +void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) { assert(m); assert(j); @@ -1040,16 +1327,23 @@ void manager_transaction_unlink_job(Manager *m, Job *j) { job_dependency_free(j->object_list); - if (other) { + if (other && delete_dependencies) { log_debug("Deleting job %s/%s as dependency of job %s/%s", - unit_id(other->unit), job_type_to_string(other->type), - unit_id(j->unit), job_type_to_string(j->type)); - transaction_delete_job(m, other); + other->unit->meta.id, job_type_to_string(other->type), + j->unit->meta.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 force, Job **_ret) { +static int transaction_add_job_and_dependencies( + Manager *m, + JobType type, + Unit *unit, + Job *by, + bool matters, + bool override, + Job **_ret) { Job *ret; Iterator i; Unit *dep; @@ -1067,7 +1361,7 @@ static int transaction_add_job_and_dependencies(Manager *m, JobType type, Unit * return -EBADR; /* First add the job. */ - if (!(ret = transaction_add_one_job(m, type, unit, force, &is_new))) + if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new))) return -ENOMEM; /* Then, add a link to the job. */ @@ -1078,28 +1372,33 @@ static int transaction_add_job_and_dependencies(Manager *m, JobType type, Unit * /* Finally, recursively add in all dependencies. */ if (type == JOB_START || type == JOB_RELOAD_OR_START) { SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i) - if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, force, NULL)) < 0 && r != -EBADR) - goto fail; - SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUIRES], i) - if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !force, force, NULL)) < 0 && r != -EBADR) + if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR) goto fail; + + SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i) + if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR) + log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r)); + SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i) - if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0 && r != -EBADR) - goto fail; + if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0) + log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r)); + SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i) - if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, force, NULL)) < 0 && r != -EBADR) - goto fail; - SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUISITE], i) - if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !force, force, NULL)) < 0 && r != -EBADR) + if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR) goto fail; + + SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i) + if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR) + log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r)); + SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i) - if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, force, NULL)) < 0 && r != -EBADR) + if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR) goto fail; } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) { SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i) - if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, force, NULL)) < 0 && r != -EBADR) + if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR) goto fail; } @@ -1115,7 +1414,39 @@ fail: return r; } -int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret) { +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->meta.id != k) + continue; + + if (UNIT_VTABLE(u)->no_isolate) + continue; + + /* No need to stop inactive jobs */ + if (unit_active_state(u) == UNIT_INACTIVE) + 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, NULL)) < 0) + log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r)); + } + + return 0; +} + +int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) { int r; Job *ret; @@ -1124,17 +1455,26 @@ int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool for assert(unit); assert(mode < _JOB_MODE_MAX); - log_debug("Trying to enqueue job %s/%s", unit_id(unit), job_type_to_string(type)); + if (mode == JOB_ISOLATE && type != JOB_START) + return -EINVAL; + + log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type)); - if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret)) < 0) { + if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &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)) < 0) return r; - log_debug("Enqueued job %s/%s as %u", unit_id(unit), job_type_to_string(type), (unsigned) ret->id); + log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id); if (_ret) *_ret = ret; @@ -1142,6 +1482,21 @@ int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool for return 0; } +int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, 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, &unit)) < 0) + return r; + + return manager_add_job(m, type, unit, mode, override, _ret); +} + Job *manager_get_job(Manager *m, uint32_t id) { assert(m); @@ -1181,19 +1536,24 @@ unsigned manager_dispatch_load_queue(Manager *m) { return n; } -int manager_load_unit(Manager *m, const char *path, Unit **_ret) { +int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) { Unit *ret; int r; - const char *name; assert(m); - assert(path); - assert(_ret); + assert(name || path); - /* This will load the service information files, but not actually - * start any services or anything. */ + /* This will prepare the unit for loading, but not actually + * load anything from disk. */ + + if (path && !is_path(path)) + return -EINVAL; - name = file_name_from_path(path); + if (!name) + name = file_name_from_path(path); + + if (!unit_name_is_valid(name)) + return -EINVAL; if ((ret = manager_get_unit(m, name))) { *_ret = ret; @@ -1203,12 +1563,11 @@ int manager_load_unit(Manager *m, const char *path, Unit **_ret) { if (!(ret = unit_new(m))) return -ENOMEM; - if (is_path(path)) { + if (path) if (!(ret->meta.fragment_path = strdup(path))) { unit_free(ret); return -ENOMEM; } - } if ((r = unit_add_name(ret, name)) < 0) { unit_free(ret); @@ -1218,9 +1577,29 @@ int manager_load_unit(Manager *m, const char *path, Unit **_ret) { unit_add_to_load_queue(ret); unit_add_to_dbus_queue(ret); + if (_ret) + *_ret = ret; + + return 0; +} + +int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) { + 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, &ret)) < 0) + return r; + manager_dispatch_load_queue(m); - *_ret = ret; + if (_ret) + *_ret = unit_follow_merge(ret); + return 0; } @@ -1244,7 +1623,7 @@ void manager_dump_units(Manager *s, FILE *f, const char *prefix) { assert(f); HASHMAP_FOREACH_KEY(u, t, s->units, i) - if (unit_id(u) == t) + if (u->meta.id == t) unit_dump(u, f, prefix); } @@ -1293,10 +1672,9 @@ unsigned manager_dispatch_dbus_queue(Manager *m) { m->dispatching_dbus_queue = true; while ((meta = m->dbus_unit_queue)) { - Unit *u = (Unit*) meta; - assert(u->meta.in_dbus_queue); + assert(meta->in_dbus_queue); - bus_unit_send_change_signal(u); + bus_unit_send_change_signal(UNIT(meta)); n++; } @@ -1314,39 +1692,73 @@ unsigned manager_dispatch_dbus_queue(Manager *m) { static int manager_dispatch_sigchld(Manager *m) { assert(m); - log_debug("dispatching SIGCHLD"); - for (;;) { siginfo_t si; Unit *u; zero(si); - if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG) < 0) { + + /* 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) + 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_name(si.si_pid, &name); + log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name)); + free(name); + } + + /* 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 %llu died (code=%s, status=%i)", (long long unsigned) si.si_pid, sigchld_code_to_string(si.si_code), si.si_status); + log_debug("Child %llu died (code=%s, status=%i/%s)", + (long 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) : strsignal(si.si_status))); if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid)))) continue; + log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id); + UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status); } return 0; } -static int manager_process_signal_fd(Manager *m, bool *quit) { +static void manager_start_target(Manager *m, const char *name) { + int r; + + if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0) + log_error("Failed to enqueue %s job: %s", name, strerror(-r)); +} + +static int manager_process_signal_fd(Manager *m) { ssize_t n; struct signalfd_siginfo sfsi; bool sigchld = false; @@ -1371,42 +1783,66 @@ static int manager_process_signal_fd(Manager *m, bool *quit) { sigchld = true; break; - case SIGINT: case SIGTERM: + if (m->running_as == MANAGER_INIT) + /* This is for compatibility with the + * original sysvinit */ + m->exit_code = MANAGER_REEXECUTE; + else + m->exit_code = MANAGER_EXIT; - if (m->running_as != MANAGER_INIT) { - *quit = true; - return 0; - - } else { - Unit *target; - int r; - - if ((r = manager_load_unit(m, SPECIAL_CTRL_ALT_DEL_TARGET, &target)) < 0) - log_error("Failed to load ctrl-alt-del target: %s", strerror(-r)); - else if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, true, NULL)) < 0) - log_error("Failed to enqueue ctrl-alt-del job: %s", strerror(-r)); + return 0; + case SIGINT: + if (m->running_as == MANAGER_INIT) { + manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET); break; } + m->exit_code = MANAGER_EXIT; + return 0; + case SIGWINCH: + if (m->running_as == MANAGER_INIT) + manager_start_target(m, SPECIAL_KBREQUEST_TARGET); - if (m->running_as == MANAGER_INIT) { - Unit *target; - int r; + /* This is a nop on non-init */ + break; - if ((r = manager_load_unit(m, SPECIAL_KBREQUEST_TARGET, &target)) < 0) - log_error("Failed to load kbrequest target: %s", strerror(-r)); - else if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, true, NULL)) < 0) - log_error("Failed to enqueue kbrequest job: %s", strerror(-r)); + case SIGPWR: + if (m->running_as == MANAGER_INIT) + manager_start_target(m, SPECIAL_SIGPWR_TARGET); - break; + /* This is a nop on non-init */ + break; + + case SIGUSR1: + manager_dump_units(m, stdout, "\t"); + manager_dump_jobs(m, stdout, "\t"); + break; + + case SIGUSR2: { + 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_system(m); + bus_init_api(m); } - /* This is a nop on non-init systemd's */ + if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) { + log_info("Loading D-Bus service..."); + manager_start_target(m, SPECIAL_DBUS_SERVICE); + } break; + } + + case SIGHUP: + m->exit_code = MANAGER_RELOAD; + break; default: log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo)); @@ -1419,7 +1855,7 @@ static int manager_process_signal_fd(Manager *m, bool *quit) { return 0; } -static int process_event(Manager *m, struct epoll_event *ev, bool *quit) { +static int process_event(Manager *m, struct epoll_event *ev) { int r; Watch *w; @@ -1436,7 +1872,7 @@ static int process_event(Manager *m, struct epoll_event *ev, bool *quit) { if (ev->events != EPOLLIN) return -EINVAL; - if ((r = manager_process_signal_fd(m, quit)) < 0) + if ((r = manager_process_signal_fd(m)) < 0) return r; break; @@ -1491,13 +1927,13 @@ static int process_event(Manager *m, struct epoll_event *ev, bool *quit) { int manager_loop(Manager *m) { int r; - bool quit = false; RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000); assert(m); + m->exit_code = MANAGER_RUNNING; - for (;;) { + while (m->exit_code == MANAGER_RUNNING) { struct epoll_event event; int n; @@ -1507,6 +1943,12 @@ int manager_loop(Manager *m) { sleep(1); } + if (manager_dispatch_cleanup_queue(m) > 0) + continue; + + if (manager_dispatch_gc_queue(m) > 0) + continue; + if (manager_dispatch_load_queue(m) > 0) continue; @@ -1521,7 +1963,7 @@ int manager_loop(Manager *m) { if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) { - if (errno == -EINTR) + if (errno == EINTR) continue; return -errno; @@ -1529,12 +1971,11 @@ int manager_loop(Manager *m) { assert(n == 1); - if ((r = process_event(m, &event, &quit)) < 0) + if ((r = process_event(m, &event)) < 0) return r; - - if (quit) - return 0; } + + return m->exit_code; } int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) { @@ -1585,6 +2026,256 @@ int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) { return 0; } +static bool manager_utmp_good(Manager *m) { + int r; + + assert(m); + + if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) { + + if (r < 0) + log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r)); + + return false; + } + + return true; +} + +void manager_write_utmp_reboot(Manager *m) { + int r; + + assert(m); + + if (m->utmp_reboot_written) + return; + + if (m->running_as != MANAGER_INIT) + return; + + if (!manager_utmp_good(m)) + return; + + if ((r = utmp_put_reboot(m->boot_timestamp)) < 0) { + + if (r != -ENOENT && r != -EROFS) + log_warning("Failed to write utmp/wtmp: %s", strerror(-r)); + + return; + } + + m->utmp_reboot_written = true; +} + +void manager_write_utmp_runlevel(Manager *m, Unit *u) { + int runlevel, r; + + assert(m); + assert(u); + + if (u->meta.type != UNIT_TARGET) + return; + + if (m->running_as != MANAGER_INIT) + return; + + if (!manager_utmp_good(m)) + return; + + if ((runlevel = target_get_runlevel(TARGET(u))) <= 0) + return; + + if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) { + + if (r != -ENOENT && r != -EROFS) + log_warning("Failed to write utmp/wtmp: %s", strerror(-r)); + } +} + +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(FILE **_f) { + char *path; + mode_t saved_umask; + int fd; + FILE *f; + + assert(_f); + + if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0) + 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+")) < 0) + 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); + + HASHMAP_FOREACH_KEY(u, t, m->units, i) { + if (u->meta.id != t) + continue; + + if (!unit_can_serialize(u)) + continue; + + /* Start marker */ + fputs(u->meta.id, f); + fputc('\n', f); + + if ((r = unit_serialize(u, f, fds)) < 0) + return r; + } + + if (ferror(f)) + return -EIO; + + return 0; +} + +int manager_deserialize(Manager *m, FILE *f, FDSet *fds) { + int r = 0; + + assert(m); + assert(f); + + log_debug("Deserializing state..."); + + for (;;) { + Unit *u; + char name[UNIT_NAME_MAX+2]; + + /* Start marker */ + if (!fgets(name, sizeof(name), f)) { + if (feof(f)) + break; + + return -errno; + } + + char_array_0(name); + + if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0) + return r; + + if ((r = unit_deserialize(u, f, fds)) < 0) + return r; + } + + if (ferror(f)) + return -EIO; + + return 0; +} + +int manager_reload(Manager *m) { + int r, q; + FILE *f; + FDSet *fds; + + assert(m); + + if ((r = manager_open_serialization(&f)) < 0) + return r; + + if (!(fds = fdset_new())) { + r = -ENOMEM; + goto finish; + } + + if ((r = manager_serialize(m, f, fds)) < 0) + goto finish; + + if (fseeko(f, 0, SEEK_SET) < 0) { + r = -errno; + goto finish; + } + + /* From here on there is no way back. */ + manager_clear_jobs_and_units(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; + +finish: + if (f) + fclose(f); + + if (fds) + fdset_free(fds); + + return r; +} + static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = { [MANAGER_INIT] = "init", [MANAGER_SYSTEM] = "system",