move libsystemd_core.la sources into core/

1 files changed, 701 insertions, 0 deletions

diff --git a/src/core/job.c b/src/core/job.c
new file mode 100644
index 0000000000..bae6ab9f32
--- /dev/null
+++ b/src/core/job.c
@@ -0,0 +1,701 @@
+/*-*- 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 <sys/timerfd.h>
+#include <sys/epoll.h>
+
+#include "set.h"
+#include "unit.h"
+#include "macro.h"
+#include "strv.h"
+#include "load-fragment.h"
+#include "load-dropin.h"
+#include "log.h"
+#include "dbus-job.h"
+
+Job* job_new(Manager *m, JobType type, Unit *unit) {
+        Job *j;
+
+        assert(m);
+        assert(type < _JOB_TYPE_MAX);
+        assert(unit);
+
+        if (!(j = new0(Job, 1)))
+                return NULL;
+
+        j->manager = m;
+        j->id = m->current_job_id++;
+        j->type = type;
+        j->unit = unit;
+
+        j->timer_watch.type = WATCH_INVALID;
+
+        /* We don't link it here, that's what job_dependency() is for */
+
+        return j;
+}
+
+void job_free(Job *j) {
+        assert(j);
+
+        /* Detach from next 'bigger' objects */
+        if (j->installed) {
+                bus_job_send_removed_signal(j);
+
+                if (j->unit->job == j) {
+                        j->unit->job = NULL;
+                        unit_add_to_gc_queue(j->unit);
+                }
+
+                hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
+                j->installed = false;
+        }
+
+        /* Detach from next 'smaller' objects */
+        manager_transaction_unlink_job(j->manager, j, true);
+
+        if (j->in_run_queue)
+                LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
+
+        if (j->in_dbus_queue)
+                LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
+
+        if (j->timer_watch.type != WATCH_INVALID) {
+                assert(j->timer_watch.type == WATCH_JOB_TIMER);
+                assert(j->timer_watch.data.job == j);
+                assert(j->timer_watch.fd >= 0);
+
+                assert_se(epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_DEL, j->timer_watch.fd, NULL) >= 0);
+                close_nointr_nofail(j->timer_watch.fd);
+        }
+
+        free(j->bus_client);
+        free(j);
+}
+
+JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts) {
+        JobDependency *l;
+
+        assert(object);
+
+        /* Adds a new job link, which encodes that the 'subject' job
+         * needs the 'object' job in some way. If 'subject' is NULL
+         * this means the 'anchor' job (i.e. the one the user
+         * explicitly asked for) is the requester. */
+
+        if (!(l = new0(JobDependency, 1)))
+                return NULL;
+
+        l->subject = subject;
+        l->object = object;
+        l->matters = matters;
+        l->conflicts = conflicts;
+
+        if (subject)
+                LIST_PREPEND(JobDependency, subject, subject->subject_list, l);
+        else
+                LIST_PREPEND(JobDependency, subject, object->manager->transaction_anchor, l);
+
+        LIST_PREPEND(JobDependency, object, object->object_list, l);
+
+        return l;
+}
+
+void job_dependency_free(JobDependency *l) {
+        assert(l);
+
+        if (l->subject)
+                LIST_REMOVE(JobDependency, subject, l->subject->subject_list, l);
+        else
+                LIST_REMOVE(JobDependency, subject, l->object->manager->transaction_anchor, l);
+
+        LIST_REMOVE(JobDependency, object, l->object->object_list, l);
+
+        free(l);
+}
+
+void job_dump(Job *j, FILE*f, const char *prefix) {
+        assert(j);
+        assert(f);
+
+        if (!prefix)
+                prefix = "";
+
+        fprintf(f,
+                "%s-> Job %u:\n"
+                "%s\tAction: %s -> %s\n"
+                "%s\tState: %s\n"
+                "%s\tForced: %s\n",
+                prefix, j->id,
+                prefix, j->unit->id, job_type_to_string(j->type),
+                prefix, job_state_to_string(j->state),
+                prefix, yes_no(j->override));
+}
+
+bool job_is_anchor(Job *j) {
+        JobDependency *l;
+
+        assert(j);
+
+        LIST_FOREACH(object, l, j->object_list)
+                if (!l->subject)
+                        return true;
+
+        return false;
+}
+
+/*
+ * Merging is commutative, so imagine the matrix as symmetric. We store only
+ * its lower triangle to avoid duplication. We don't store the main diagonal,
+ * because A merged with A is simply A.
+ *
+ * Merging is associative! A merged with B merged with C is the same as
+ * A merged with C merged with B.
+ *
+ * Mergeability is transitive! If A can be merged with B and B with C then
+ * A also with C.
+ *
+ * Also, if A merged with B cannot be merged with C, then either A or B cannot
+ * be merged with C either.
+ */
+static const JobType job_merging_table[] = {
+/* What \ With       *  JOB_START         JOB_VERIFY_ACTIVE  JOB_STOP JOB_RELOAD   JOB_RELOAD_OR_START  JOB_RESTART JOB_TRY_RESTART */
+/************************************************************************************************************************************/
+/*JOB_START          */
+/*JOB_VERIFY_ACTIVE  */ JOB_START,
+/*JOB_STOP           */ -1,                  -1,
+/*JOB_RELOAD         */ JOB_RELOAD_OR_START, JOB_RELOAD,          -1,
+/*JOB_RELOAD_OR_START*/ JOB_RELOAD_OR_START, JOB_RELOAD_OR_START, -1, JOB_RELOAD_OR_START,
+/*JOB_RESTART        */ JOB_RESTART,         JOB_RESTART,         -1, JOB_RESTART,         JOB_RESTART,
+/*JOB_TRY_RESTART    */ JOB_RESTART,         JOB_TRY_RESTART,     -1, JOB_TRY_RESTART,     JOB_RESTART, JOB_RESTART,
+};
+
+JobType job_type_lookup_merge(JobType a, JobType b) {
+        assert_cc(ELEMENTSOF(job_merging_table) == _JOB_TYPE_MAX * (_JOB_TYPE_MAX - 1) / 2);
+        assert(a >= 0 && a < _JOB_TYPE_MAX);
+        assert(b >= 0 && b < _JOB_TYPE_MAX);
+
+        if (a == b)
+                return a;
+
+        if (a < b) {
+                JobType tmp = a;
+                a = b;
+                b = tmp;
+        }
+
+        return job_merging_table[(a - 1) * a / 2 + b];
+}
+
+bool job_type_is_redundant(JobType a, UnitActiveState b) {
+        switch (a) {
+
+        case JOB_START:
+                return
+                        b == UNIT_ACTIVE ||
+                        b == UNIT_RELOADING;
+
+        case JOB_STOP:
+                return
+                        b == UNIT_INACTIVE ||
+                        b == UNIT_FAILED;
+
+        case JOB_VERIFY_ACTIVE:
+                return
+                        b == UNIT_ACTIVE ||
+                        b == UNIT_RELOADING;
+
+        case JOB_RELOAD:
+                return
+                        b == UNIT_RELOADING;
+
+        case JOB_RELOAD_OR_START:
+                return
+                        b == UNIT_ACTIVATING ||
+                        b == UNIT_RELOADING;
+
+        case JOB_RESTART:
+                return
+                        b == UNIT_ACTIVATING;
+
+        case JOB_TRY_RESTART:
+                return
+                        b == UNIT_ACTIVATING;
+
+        default:
+                assert_not_reached("Invalid job type");
+        }
+}
+
+bool job_is_runnable(Job *j) {
+        Iterator i;
+        Unit *other;
+
+        assert(j);
+        assert(j->installed);
+
+        /* Checks whether there is any job running for the units this
+         * job needs to be running after (in the case of a 'positive'
+         * job type) or before (in the case of a 'negative' job
+         * type. */
+
+        /* First check if there is an override */
+        if (j->ignore_order)
+                return true;
+
+        if (j->type == JOB_START ||
+            j->type == JOB_VERIFY_ACTIVE ||
+            j->type == JOB_RELOAD ||
+            j->type == JOB_RELOAD_OR_START) {
+
+                /* Immediate result is that the job is or might be
+                 * started. In this case lets wait for the
+                 * dependencies, regardless whether they are
+                 * starting or stopping something. */
+
+                SET_FOREACH(other, j->unit->dependencies[UNIT_AFTER], i)
+                        if (other->job)
+                                return false;
+        }
+
+        /* Also, if something else is being stopped and we should
+         * change state after it, then lets wait. */
+
+        SET_FOREACH(other, j->unit->dependencies[UNIT_BEFORE], i)
+                if (other->job &&
+                    (other->job->type == JOB_STOP ||
+                     other->job->type == JOB_RESTART ||
+                     other->job->type == JOB_TRY_RESTART))
+                        return false;
+
+        /* This means that for a service a and a service b where b
+         * shall be started after a:
+         *
+         *  start a + start b → 1st step start a, 2nd step start b
+         *  start a + stop b  → 1st step stop b,  2nd step start a
+         *  stop a  + start b → 1st step stop a,  2nd step start b
+         *  stop a  + stop b  → 1st step stop b,  2nd step stop a
+         *
+         *  This has the side effect that restarts are properly
+         *  synchronized too. */
+
+        return true;
+}
+
+static void job_change_type(Job *j, JobType newtype) {
+        log_debug("Converting job %s/%s -> %s/%s",
+                  j->unit->id, job_type_to_string(j->type),
+                  j->unit->id, job_type_to_string(newtype));
+
+        j->type = newtype;
+}
+
+int job_run_and_invalidate(Job *j) {
+        int r;
+        uint32_t id;
+        Manager *m;
+
+        assert(j);
+        assert(j->installed);
+
+        if (j->in_run_queue) {
+                LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
+                j->in_run_queue = false;
+        }
+
+        if (j->state != JOB_WAITING)
+                return 0;
+
+        if (!job_is_runnable(j))
+                return -EAGAIN;
+
+        j->state = JOB_RUNNING;
+        job_add_to_dbus_queue(j);
+
+        /* While we execute this operation the job might go away (for
+         * example: because it is replaced by a new, conflicting
+         * job.) To make sure we don't access a freed job later on we
+         * store the id here, so that we can verify the job is still
+         * valid. */
+        id = j->id;
+        m = j->manager;
+
+        switch (j->type) {
+
+                case JOB_RELOAD_OR_START:
+                        if (unit_active_state(j->unit) == UNIT_ACTIVE) {
+                                job_change_type(j, JOB_RELOAD);
+                                r = unit_reload(j->unit);
+                                break;
+                        }
+                        job_change_type(j, JOB_START);
+                        /* fall through */
+
+                case JOB_START:
+                        r = unit_start(j->unit);
+
+                        /* If this unit cannot be started, then simply wait */
+                        if (r == -EBADR)
+                                r = 0;
+                        break;
+
+                case JOB_VERIFY_ACTIVE: {
+                        UnitActiveState t = unit_active_state(j->unit);
+                        if (UNIT_IS_ACTIVE_OR_RELOADING(t))
+                                r = -EALREADY;
+                        else if (t == UNIT_ACTIVATING)
+                                r = -EAGAIN;
+                        else
+                                r = -ENOEXEC;
+                        break;
+                }
+
+                case JOB_TRY_RESTART:
+                        if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(j->unit))) {
+                                r = -ENOEXEC;
+                                break;
+                        }
+                        job_change_type(j, JOB_RESTART);
+                        /* fall through */
+
+                case JOB_STOP:
+                case JOB_RESTART:
+                        r = unit_stop(j->unit);
+
+                        /* If this unit cannot stopped, then simply wait. */
+                        if (r == -EBADR)
+                                r = 0;
+                        break;
+
+                case JOB_RELOAD:
+                        r = unit_reload(j->unit);
+                        break;
+
+                default:
+                        assert_not_reached("Unknown job type");
+        }
+
+        if ((j = manager_get_job(m, id))) {
+                if (r == -EALREADY)
+                        r = job_finish_and_invalidate(j, JOB_DONE);
+                else if (r == -ENOEXEC)
+                        r = job_finish_and_invalidate(j, JOB_SKIPPED);
+                else if (r == -EAGAIN)
+                        j->state = JOB_WAITING;
+                else if (r < 0)
+                        r = job_finish_and_invalidate(j, JOB_FAILED);
+        }
+
+        return r;
+}
+
+static void job_print_status_message(Unit *u, JobType t, JobResult result) {
+        assert(u);
+
+        if (t == JOB_START) {
+
+                switch (result) {
+
+                case JOB_DONE:
+                        unit_status_printf(u, ANSI_HIGHLIGHT_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, "Started %s", unit_description(u));
+                        break;
+
+                case JOB_FAILED:
+                        unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON "FAILED" ANSI_HIGHLIGHT_OFF, "Failed to start %s", unit_description(u));
+                        unit_status_printf(u, NULL, "See 'systemctl status %s' for details.", u->id);
+                        break;
+
+                case JOB_DEPENDENCY:
+                        unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " ABORT" ANSI_HIGHLIGHT_OFF, "Dependency failed. Aborted start of %s", unit_description(u));
+                        break;
+
+                case JOB_TIMEOUT:
+                        unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, "Timed out starting %s", unit_description(u));
+                        break;
+
+                default:
+                        ;
+                }
+
+        } else if (t == JOB_STOP) {
+
+                switch (result) {
+
+                case JOB_TIMEOUT:
+                        unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, "Timed out stopping %s", unit_description(u));
+                        break;
+
+                case JOB_DONE:
+                case JOB_FAILED:
+                        unit_status_printf(u, ANSI_HIGHLIGHT_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, "Stopped %s", unit_description(u));
+                        break;
+
+                default:
+                        ;
+                }
+        }
+}
+
+int job_finish_and_invalidate(Job *j, JobResult result) {
+        Unit *u;
+        Unit *other;
+        JobType t;
+        Iterator i;
+        bool recursed = false;
+
+        assert(j);
+        assert(j->installed);
+
+        job_add_to_dbus_queue(j);
+
+        /* Patch restart jobs so that they become normal start jobs */
+        if (result == JOB_DONE && j->type == JOB_RESTART) {
+
+                job_change_type(j, JOB_START);
+                j->state = JOB_WAITING;
+
+                job_add_to_run_queue(j);
+
+                u = j->unit;
+                goto finish;
+        }
+
+        j->result = result;
+
+        log_debug("Job %s/%s finished, result=%s", j->unit->id, job_type_to_string(j->type), job_result_to_string(result));
+
+        if (result == JOB_FAILED)
+                j->manager->n_failed_jobs ++;
+
+        u = j->unit;
+        t = j->type;
+        job_free(j);
+
+        job_print_status_message(u, t, result);
+
+        /* Fail depending jobs on failure */
+        if (result != JOB_DONE) {
+
+                if (t == JOB_START ||
+                    t == JOB_VERIFY_ACTIVE ||
+                    t == JOB_RELOAD_OR_START) {
+
+                        SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
+                                if (other->job &&
+                                    (other->job->type == JOB_START ||
+                                     other->job->type == JOB_VERIFY_ACTIVE ||
+                                     other->job->type == JOB_RELOAD_OR_START)) {
+                                        job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
+                                        recursed = true;
+                                }
+
+                        SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
+                                if (other->job &&
+                                    (other->job->type == JOB_START ||
+                                     other->job->type == JOB_VERIFY_ACTIVE ||
+                                     other->job->type == JOB_RELOAD_OR_START)) {
+                                        job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
+                                        recursed = true;
+                                }
+
+                        SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
+                                if (other->job &&
+                                    !other->job->override &&
+                                    (other->job->type == JOB_START ||
+                                     other->job->type == JOB_VERIFY_ACTIVE ||
+                                     other->job->type == JOB_RELOAD_OR_START)) {
+                                        job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
+                                        recursed = true;
+                                }
+
+                } else if (t == JOB_STOP) {
+
+                        SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
+                                if (other->job &&
+                                    (other->job->type == JOB_START ||
+                                     other->job->type == JOB_VERIFY_ACTIVE ||
+                                     other->job->type == JOB_RELOAD_OR_START)) {
+                                        job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
+                                        recursed = true;
+                                }
+                }
+        }
+
+        /* Trigger OnFailure dependencies that are not generated by
+         * the unit itself. We don't tread JOB_CANCELED as failure in
+         * this context. And JOB_FAILURE is already handled by the
+         * unit itself. */
+        if (result == JOB_TIMEOUT || result == JOB_DEPENDENCY) {
+                log_notice("Job %s/%s failed with result '%s'.",
+                           u->id,
+                           job_type_to_string(t),
+                           job_result_to_string(result));
+
+                unit_trigger_on_failure(u);
+        }
+
+finish:
+        /* Try to start the next jobs that can be started */
+        SET_FOREACH(other, u->dependencies[UNIT_AFTER], i)
+                if (other->job)
+                        job_add_to_run_queue(other->job);
+        SET_FOREACH(other, u->dependencies[UNIT_BEFORE], i)
+                if (other->job)
+                        job_add_to_run_queue(other->job);
+
+        manager_check_finished(u->manager);
+
+        return recursed;
+}
+
+int job_start_timer(Job *j) {
+        struct itimerspec its;
+        struct epoll_event ev;
+        int fd, r;
+        assert(j);
+
+        if (j->unit->job_timeout <= 0 ||
+            j->timer_watch.type == WATCH_JOB_TIMER)
+                return 0;
+
+        assert(j->timer_watch.type == WATCH_INVALID);
+
+        if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        zero(its);
+        timespec_store(&its.it_value, j->unit->job_timeout);
+
+        if (timerfd_settime(fd, 0, &its, NULL) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        zero(ev);
+        ev.data.ptr = &j->timer_watch;
+        ev.events = EPOLLIN;
+
+        if (epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        j->timer_watch.type = WATCH_JOB_TIMER;
+        j->timer_watch.fd = fd;
+        j->timer_watch.data.job = j;
+
+        return 0;
+
+fail:
+        if (fd >= 0)
+                close_nointr_nofail(fd);
+
+        return r;
+}
+
+void job_add_to_run_queue(Job *j) {
+        assert(j);
+        assert(j->installed);
+
+        if (j->in_run_queue)
+                return;
+
+        LIST_PREPEND(Job, run_queue, j->manager->run_queue, j);
+        j->in_run_queue = true;
+}
+
+void job_add_to_dbus_queue(Job *j) {
+        assert(j);
+        assert(j->installed);
+
+        if (j->in_dbus_queue)
+                return;
+
+        /* We don't check if anybody is subscribed here, since this
+         * job might just have been created and not yet assigned to a
+         * connection/client. */
+
+        LIST_PREPEND(Job, dbus_queue, j->manager->dbus_job_queue, j);
+        j->in_dbus_queue = true;
+}
+
+char *job_dbus_path(Job *j) {
+        char *p;
+
+        assert(j);
+
+        if (asprintf(&p, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j->id) < 0)
+                return NULL;
+
+        return p;
+}
+
+void job_timer_event(Job *j, uint64_t n_elapsed, Watch *w) {
+        assert(j);
+        assert(w == &j->timer_watch);
+
+        log_warning("Job %s/%s timed out.", j->unit->id, job_type_to_string(j->type));
+        job_finish_and_invalidate(j, JOB_TIMEOUT);
+}
+
+static const char* const job_state_table[_JOB_STATE_MAX] = {
+        [JOB_WAITING] = "waiting",
+        [JOB_RUNNING] = "running"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(job_state, JobState);
+
+static const char* const job_type_table[_JOB_TYPE_MAX] = {
+        [JOB_START] = "start",
+        [JOB_VERIFY_ACTIVE] = "verify-active",
+        [JOB_STOP] = "stop",
+        [JOB_RELOAD] = "reload",
+        [JOB_RELOAD_OR_START] = "reload-or-start",
+        [JOB_RESTART] = "restart",
+        [JOB_TRY_RESTART] = "try-restart",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(job_type, JobType);
+
+static const char* const job_mode_table[_JOB_MODE_MAX] = {
+        [JOB_FAIL] = "fail",
+        [JOB_REPLACE] = "replace",
+        [JOB_ISOLATE] = "isolate",
+        [JOB_IGNORE_DEPENDENCIES] = "ignore-dependencies",
+        [JOB_IGNORE_REQUIREMENTS] = "ignore-requirements"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);
+
+static const char* const job_result_table[_JOB_RESULT_MAX] = {
+        [JOB_DONE] = "done",
+        [JOB_CANCELED] = "canceled",
+        [JOB_TIMEOUT] = "timeout",
+        [JOB_FAILED] = "failed",
+        [JOB_DEPENDENCY] = "dependency",
+        [JOB_SKIPPED] = "skipped"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(job_result, JobResult);