/*-*- 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include "transaction.h" #include "bus-errors.h" static void transaction_unlink_job(Transaction *tr, Job *j, bool delete_dependencies); static void transaction_delete_job(Transaction *tr, Job *j, bool delete_dependencies) { assert(tr); assert(j); /* Deletes one job from the transaction */ transaction_unlink_job(tr, j, delete_dependencies); job_free(j); } static void transaction_delete_unit(Transaction *tr, Unit *u) { Job *j; /* Deletes all jobs associated with a certain unit from the * transaction */ while ((j = hashmap_get(tr->jobs, u))) transaction_delete_job(tr, j, true); } void transaction_abort(Transaction *tr) { Job *j; assert(tr); while ((j = hashmap_first(tr->jobs))) transaction_delete_job(tr, j, true); assert(hashmap_isempty(tr->jobs)); } static void transaction_find_jobs_that_matter_to_anchor(Job *j, unsigned generation) { JobDependency *l; /* 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. */ j->matters_to_anchor = true; j->generation = generation; LIST_FOREACH(subject, l, j->subject_list) { /* This link does not matter */ if (!l->matters) continue; /* This unit has already been marked */ if (l->object->generation == generation) continue; transaction_find_jobs_that_matter_to_anchor(l->object, generation); } } static void transaction_merge_and_delete_job(Transaction *tr, 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 'other'. */ 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(tr, 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(Transaction *tr, 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(tr, d, true); return 0; } return -EINVAL; } static int transaction_merge_jobs(Transaction *tr, DBusError *e) { Job *j; Iterator i; int r; assert(tr); /* First step, check whether any of the jobs for one specific * task conflict. If so, try to drop one of them. */ HASHMAP_FOREACH(j, tr->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 */ r = delete_one_unmergeable_job(tr, j); if (r >= 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, tr->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); while ((k = j->transaction_next)) { if (tr->anchor_job == k) { transaction_merge_and_delete_job(tr, k, j, t); j = k; } else transaction_merge_and_delete_job(tr, j, k, t); } assert(!j->transaction_next); assert(!j->transaction_prev); } return 0; } static void transaction_drop_redundant(Transaction *tr) { bool again; assert(tr); /* Goes through the transaction and removes all jobs that are * a noop */ do { Job *j; Iterator i; again = false; HASHMAP_FOREACH(j, tr->jobs, i) { bool changes_something = false; Job *k; LIST_FOREACH(transaction, k, j) { if (tr->anchor_job != k && 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(tr, 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(Transaction *tr, Job *j, Job *from, unsigned generation, DBusError *e) { Iterator i; Unit *u; int r; assert(tr); 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 && !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(tr, 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? */ o = hashmap_get(tr->jobs, u); if (!o) { /* Ok, there is no job for this in the * transaction, but maybe there is already one * running? */ o = u->job; if (!o) continue; } r = transaction_verify_order_one(tr, o, j, generation, e); if (r < 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(Transaction *tr, unsigned *generation, DBusError *e) { Job *j; int r; Iterator i; unsigned g; assert(tr); 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, tr->jobs, i) if ((r = transaction_verify_order_one(tr, j, NULL, g, e)) < 0) return r; return 0; } static void transaction_collect_garbage(Transaction *tr) { bool again; assert(tr); /* Drop jobs that are not required by any other job */ do { Iterator i; Job *j; again = false; HASHMAP_FOREACH(j, tr->jobs, i) { if (tr->anchor_job == j || 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(tr, j, true); again = true; break; } } while (again); } static int transaction_is_destructive(Transaction *tr, DBusError *e) { Iterator i; Job *j; assert(tr); /* Checks whether applying this transaction means that * existing jobs would be replaced */ HASHMAP_FOREACH(j, tr->jobs, i) { /* Assume merged */ assert(!j->transaction_prev); assert(!j->transaction_next); if (j->unit->job && !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(Transaction *tr) { bool again; assert(tr); /* 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, tr->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(tr, j, true); again = true; break; } if (again) break; } } while (again); } static int transaction_apply(Transaction *tr, 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(tr->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, tr->jobs, i) { /* Assume merged */ assert(!j->transaction_prev); assert(!j->transaction_next); r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j); if (r < 0) goto rollback; } while ((j = hashmap_steal_first(tr->jobs))) { Job *installed_job; /* Clean the job dependencies */ transaction_unlink_job(tr, j, false); installed_job = job_install(j); if (installed_job != j) { /* j has been merged into a previously installed job */ if (tr->anchor_job == j) tr->anchor_job = installed_job; hashmap_remove(m->jobs, UINT32_TO_PTR(j->id)); job_free(j); j = installed_job; } job_add_to_run_queue(j); job_add_to_dbus_queue(j); job_start_timer(j); } return 0; rollback: HASHMAP_FOREACH(j, tr->jobs, i) hashmap_remove(m->jobs, UINT32_TO_PTR(j->id)); return r; } int transaction_activate(Transaction *tr, Manager *m, JobMode mode, DBusError *e) { int r; unsigned generation = 1; assert(tr); /* This applies the changes recorded in tr->jobs to * the actual list of jobs, if possible. */ /* First step: figure out which jobs matter */ transaction_find_jobs_that_matter_to_anchor(tr->anchor_job, 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(tr); /* Third step: Drop redundant jobs */ transaction_drop_redundant(tr); for (;;) { /* Fourth step: Let's remove unneeded jobs that might * be lurking. */ if (mode != JOB_ISOLATE) transaction_collect_garbage(tr); /* Fifth step: verify order makes sense and correct * cycles if necessary and possible */ r = transaction_verify_order(tr, &generation, e); if (r >= 0) break; if (r != -EAGAIN) { log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r)); return r; } /* 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 */ r = transaction_merge_jobs(tr, e); if (r >= 0) break; if (r != -EAGAIN) { log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r)); return r; } /* Seventh step: an entry got dropped, let's garbage * collect its dependencies. */ if (mode != JOB_ISOLATE) transaction_collect_garbage(tr); /* 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(tr); /* Ninth step: check whether we can actually apply this */ if (mode == JOB_FAIL) { r = transaction_is_destructive(tr, e); if (r < 0) { log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r)); return r; } } /* Tenth step: apply changes */ r = transaction_apply(tr, m, mode); if (r < 0) { log_warning("Failed to apply transaction: %s", strerror(-r)); return r; } assert(hashmap_isempty(tr->jobs)); return 0; } static Job* transaction_add_one_job(Transaction *tr, JobType type, Unit *unit, bool override, bool *is_new) { Job *j, *f; assert(tr); 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(tr->jobs, unit); LIST_FOREACH(transaction, j, f) { assert(j->unit == unit); if (j->type == type) { if (is_new) *is_new = false; return j; } } j = job_new(unit, type); if (!j) 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(tr->jobs, unit, f) < 0) { LIST_REMOVE(Job, transaction, f, j); 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; } static void transaction_unlink_job(Transaction *tr, Job *j, bool delete_dependencies) { assert(tr); assert(j); if (j->transaction_prev) j->transaction_prev->transaction_next = j->transaction_next; else if (j->transaction_next) hashmap_replace(tr->jobs, j->unit, j->transaction_next); else hashmap_remove_value(tr->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(tr, other, delete_dependencies); } } } int transaction_add_job_and_dependencies( Transaction *tr, JobType type, Unit *unit, Job *by, bool matters, bool override, bool conflicts, bool ignore_requirements, bool ignore_order, DBusError *e) { Job *ret; Iterator i; Unit *dep; int r; bool is_new; assert(tr); 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 -EADDRNOTAVAIL; } 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. */ ret = transaction_add_one_job(tr, type, unit, override, &is_new); if (!ret) return -ENOMEM; ret->ignore_order = ret->ignore_order || ignore_order; /* Then, add a link to the job. */ if (by) { if (!job_dependency_new(by, ret, matters, conflicts)) return -ENOMEM; } else { /* If the job has no parent job, it is the anchor job. */ assert(!tr->anchor_job); tr->anchor_job = ret; } 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) { r = transaction_add_job_and_dependencies(tr, type, dep, ret, false, override, false, false, ignore_order, e); if (r < 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 || type == JOB_RESTART) { SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRES], i) { r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, true, override, false, false, ignore_order, e); if (r < 0) { if (r != -EBADR) goto fail; if (e) dbus_error_free(e); } } SET_FOREACH(dep, ret->unit->dependencies[UNIT_BIND_TO], i) { r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, true, override, false, false, ignore_order, e); if (r < 0) { if (r != -EBADR) goto fail; if (e) dbus_error_free(e); } } SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUIRES_OVERRIDABLE], i) { r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, !override, override, false, false, ignore_order, e); if (r < 0) { log_full(r == -EADDRNOTAVAIL ? LOG_DEBUG : 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) { r = transaction_add_job_and_dependencies(tr, JOB_START, dep, ret, false, false, false, false, ignore_order, e); if (r < 0) { log_full(r == -EADDRNOTAVAIL ? LOG_DEBUG : 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) { r = transaction_add_job_and_dependencies(tr, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e); if (r < 0) { if (r != -EBADR) goto fail; if (e) dbus_error_free(e); } } SET_FOREACH(dep, ret->unit->dependencies[UNIT_REQUISITE_OVERRIDABLE], i) { r = transaction_add_job_and_dependencies(tr, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e); if (r < 0) { log_full(r == -EADDRNOTAVAIL ? LOG_DEBUG : 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) { r = transaction_add_job_and_dependencies(tr, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e); if (r < 0) { if (r != -EBADR) goto fail; if (e) dbus_error_free(e); } } SET_FOREACH(dep, ret->unit->dependencies[UNIT_CONFLICTED_BY], i) { r = transaction_add_job_and_dependencies(tr, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e); if (r < 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) { r = transaction_add_job_and_dependencies(tr, type, dep, ret, true, override, false, false, ignore_order, e); if (r < 0) { if (r != -EBADR) goto fail; if (e) dbus_error_free(e); } } SET_FOREACH(dep, ret->unit->dependencies[UNIT_BOUND_BY], i) { r = transaction_add_job_and_dependencies(tr, type, dep, ret, true, override, false, false, ignore_order, e); if (r < 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(tr, JOB_RELOAD, dep, ret, false, override, false, false, ignore_order, e); 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 */ } return 0; fail: return r; } int transaction_add_isolate_jobs(Transaction *tr, Manager *m) { Iterator i; Unit *u; char *k; int r; assert(tr); 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(tr->jobs, u)) continue; r = transaction_add_job_and_dependencies(tr, JOB_STOP, u, tr->anchor_job, true, false, false, false, false, NULL); if (r < 0) log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->id, strerror(-r)); } return 0; } Transaction *transaction_new(void) { Transaction *tr; tr = new0(Transaction, 1); if (!tr) return NULL; tr->jobs = hashmap_new(trivial_hash_func, trivial_compare_func); if (!tr->jobs) { free(tr); return NULL; } return tr; } void transaction_free(Transaction *tr) { assert(hashmap_isempty(tr->jobs)); hashmap_free(tr->jobs); free(tr); }