+++ /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 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 <http://www.gnu.org/licenses/>.
-***/
-
-#include <sys/inotify.h>
-#include <sys/epoll.h>
-#include <errno.h>
-#include <unistd.h>
-
-#include "unit.h"
-#include "unit-name.h"
-#include "path.h"
-#include "mkdir.h"
-#include "dbus-path.h"
-#include "special.h"
-#include "macro.h"
-#include "bus-util.h"
-#include "bus-error.h"
-
-static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
- [PATH_DEAD] = UNIT_INACTIVE,
- [PATH_WAITING] = UNIT_ACTIVE,
- [PATH_RUNNING] = UNIT_ACTIVE,
- [PATH_FAILED] = UNIT_FAILED
-};
-
-static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
-
-int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
-
- static const int flags_table[_PATH_TYPE_MAX] = {
- [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
- [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
- [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO,
- [PATH_MODIFIED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO|IN_MODIFY,
- [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO
- };
-
- bool exists = false;
- char *slash, *oldslash = NULL;
- int r;
-
- assert(s);
- assert(s->unit);
- assert(handler);
-
- path_spec_unwatch(s);
-
- s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
- if (s->inotify_fd < 0) {
- r = -errno;
- goto fail;
- }
-
- r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s);
- if (r < 0)
- goto fail;
-
- /* This assumes the path was passed through path_kill_slashes()! */
-
- for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) {
- char *cut = NULL;
- int flags;
- char tmp;
-
- if (slash) {
- cut = slash + (slash == s->path);
- tmp = *cut;
- *cut = '\0';
-
- flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
- } else
- flags = flags_table[s->type];
-
- r = inotify_add_watch(s->inotify_fd, s->path, flags);
- if (r < 0) {
- if (errno == EACCES || errno == ENOENT) {
- if (cut)
- *cut = tmp;
- break;
- }
-
- log_warning("Failed to add watch on %s: %s", s->path,
- errno == ENOSPC ? "too many watches" : strerror(-r));
- r = -errno;
- if (cut)
- *cut = tmp;
- goto fail;
- } else {
- exists = true;
-
- /* Path exists, we don't need to watch parent
- too closely. */
- if (oldslash) {
- char *cut2 = oldslash + (oldslash == s->path);
- char tmp2 = *cut2;
- *cut2 = '\0';
-
- inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF);
- /* Error is ignored, the worst can happen is
- we get spurious events. */
-
- *cut2 = tmp2;
- }
- }
-
- if (cut)
- *cut = tmp;
-
- if (slash)
- oldslash = slash;
- else {
- /* whole path has been iterated over */
- s->primary_wd = r;
- break;
- }
- }
-
- if (!exists) {
- log_error_errno(errno, "Failed to add watch on any of the components of %s: %m",
- s->path);
- r = -errno; /* either EACCESS or ENOENT */
- goto fail;
- }
-
- return 0;
-
-fail:
- path_spec_unwatch(s);
- return r;
-}
-
-void path_spec_unwatch(PathSpec *s) {
- assert(s);
-
- s->event_source = sd_event_source_unref(s->event_source);
- s->inotify_fd = safe_close(s->inotify_fd);
-}
-
-int path_spec_fd_event(PathSpec *s, uint32_t revents) {
- union inotify_event_buffer buffer;
- struct inotify_event *e;
- ssize_t l;
- int r = 0;
-
- if (revents != EPOLLIN) {
- log_error("Got invalid poll event on inotify.");
- return -EINVAL;
- }
-
- l = read(s->inotify_fd, &buffer, sizeof(buffer));
- if (l < 0) {
- if (errno == EAGAIN || errno == EINTR)
- return 0;
-
- return log_error_errno(errno, "Failed to read inotify event: %m");
- }
-
- FOREACH_INOTIFY_EVENT(e, buffer, l) {
- if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) &&
- s->primary_wd == e->wd)
- r = 1;
- }
-
- return r;
-}
-
-static bool path_spec_check_good(PathSpec *s, bool initial) {
- bool good = false;
-
- switch (s->type) {
-
- case PATH_EXISTS:
- good = access(s->path, F_OK) >= 0;
- break;
-
- case PATH_EXISTS_GLOB:
- good = glob_exists(s->path) > 0;
- break;
-
- case PATH_DIRECTORY_NOT_EMPTY: {
- int k;
-
- k = dir_is_empty(s->path);
- good = !(k == -ENOENT || k > 0);
- break;
- }
-
- case PATH_CHANGED:
- case PATH_MODIFIED: {
- bool b;
-
- b = access(s->path, F_OK) >= 0;
- good = !initial && b != s->previous_exists;
- s->previous_exists = b;
- break;
- }
-
- default:
- ;
- }
-
- return good;
-}
-
-static void path_spec_mkdir(PathSpec *s, mode_t mode) {
- int r;
-
- if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB)
- return;
-
- r = mkdir_p_label(s->path, mode);
- if (r < 0)
- log_warning_errno(r, "mkdir(%s) failed: %m", s->path);
-}
-
-static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
- fprintf(f,
- "%s%s: %s\n",
- prefix,
- path_type_to_string(s->type),
- s->path);
-}
-
-void path_spec_done(PathSpec *s) {
- assert(s);
- assert(s->inotify_fd == -1);
-
- free(s->path);
-}
-
-static void path_init(Unit *u) {
- Path *p = PATH(u);
-
- assert(u);
- assert(u->load_state == UNIT_STUB);
-
- p->directory_mode = 0755;
-}
-
-void path_free_specs(Path *p) {
- PathSpec *s;
-
- assert(p);
-
- while ((s = p->specs)) {
- path_spec_unwatch(s);
- LIST_REMOVE(spec, p->specs, s);
- path_spec_done(s);
- free(s);
- }
-}
-
-static void path_done(Unit *u) {
- Path *p = PATH(u);
-
- assert(p);
-
- path_free_specs(p);
-}
-
-static int path_add_mount_links(Path *p) {
- PathSpec *s;
- int r;
-
- assert(p);
-
- LIST_FOREACH(spec, s, p->specs) {
- r = unit_require_mounts_for(UNIT(p), s->path);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-static int path_verify(Path *p) {
- assert(p);
-
- if (UNIT(p)->load_state != UNIT_LOADED)
- return 0;
-
- if (!p->specs) {
- log_unit_error(UNIT(p)->id,
- "%s lacks path setting. Refusing.", UNIT(p)->id);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int path_add_default_dependencies(Path *p) {
- int r;
-
- assert(p);
-
- r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE,
- SPECIAL_PATHS_TARGET, NULL, true);
- if (r < 0)
- return r;
-
- if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
- r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
- SPECIAL_SYSINIT_TARGET, NULL, true);
- if (r < 0)
- return r;
- }
-
- return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS,
- SPECIAL_SHUTDOWN_TARGET, NULL, true);
-}
-
-static int path_load(Unit *u) {
- Path *p = PATH(u);
- int r;
-
- assert(u);
- assert(u->load_state == UNIT_STUB);
-
- r = unit_load_fragment_and_dropin(u);
- if (r < 0)
- return r;
-
- if (u->load_state == UNIT_LOADED) {
-
- if (set_isempty(u->dependencies[UNIT_TRIGGERS])) {
- Unit *x;
-
- r = unit_load_related_unit(u, ".service", &x);
- if (r < 0)
- return r;
-
- r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true);
- if (r < 0)
- return r;
- }
-
- r = path_add_mount_links(p);
- if (r < 0)
- return r;
-
- if (UNIT(p)->default_dependencies) {
- r = path_add_default_dependencies(p);
- if (r < 0)
- return r;
- }
- }
-
- return path_verify(p);
-}
-
-static void path_dump(Unit *u, FILE *f, const char *prefix) {
- Path *p = PATH(u);
- Unit *trigger;
- PathSpec *s;
-
- assert(p);
- assert(f);
-
- trigger = UNIT_TRIGGER(u);
-
- fprintf(f,
- "%sPath State: %s\n"
- "%sResult: %s\n"
- "%sUnit: %s\n"
- "%sMakeDirectory: %s\n"
- "%sDirectoryMode: %04o\n",
- prefix, path_state_to_string(p->state),
- prefix, path_result_to_string(p->result),
- prefix, trigger ? trigger->id : "n/a",
- prefix, yes_no(p->make_directory),
- prefix, p->directory_mode);
-
- LIST_FOREACH(spec, s, p->specs)
- path_spec_dump(s, f, prefix);
-}
-
-static void path_unwatch(Path *p) {
- PathSpec *s;
-
- assert(p);
-
- LIST_FOREACH(spec, s, p->specs)
- path_spec_unwatch(s);
-}
-
-static int path_watch(Path *p) {
- int r;
- PathSpec *s;
-
- assert(p);
-
- LIST_FOREACH(spec, s, p->specs) {
- r = path_spec_watch(s, path_dispatch_io);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-static void path_set_state(Path *p, PathState state) {
- PathState old_state;
- assert(p);
-
- old_state = p->state;
- p->state = state;
-
- if (state != PATH_WAITING &&
- (state != PATH_RUNNING || p->inotify_triggered))
- path_unwatch(p);
-
- if (state != old_state)
- log_debug("%s changed %s -> %s",
- UNIT(p)->id,
- path_state_to_string(old_state),
- path_state_to_string(state));
-
- unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
-}
-
-static void path_enter_waiting(Path *p, bool initial, bool recheck);
-
-static int path_enter_waiting_coldplug(Unit *u) {
- path_enter_waiting(PATH(u), true, true);
- return 0;
-}
-
-static int path_coldplug(Unit *u, Hashmap *deferred_work) {
- Path *p = PATH(u);
-
- assert(p);
- assert(p->state == PATH_DEAD);
-
- if (p->deserialized_state != p->state) {
-
- if (p->deserialized_state == PATH_WAITING ||
- p->deserialized_state == PATH_RUNNING) {
- hashmap_put(deferred_work, u, &path_enter_waiting_coldplug);
- path_set_state(p, PATH_WAITING);
- } else
- path_set_state(p, p->deserialized_state);
- }
-
- return 0;
-}
-
-static void path_enter_dead(Path *p, PathResult f) {
- assert(p);
-
- if (f != PATH_SUCCESS)
- p->result = f;
-
- path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
-}
-
-static void path_enter_running(Path *p) {
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- int r;
-
- assert(p);
-
- /* Don't start job if we are supposed to go down */
- if (unit_stop_pending(UNIT(p)))
- return;
-
- r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)),
- JOB_REPLACE, true, &error, NULL);
- if (r < 0)
- goto fail;
-
- p->inotify_triggered = false;
-
- r = path_watch(p);
- if (r < 0)
- goto fail;
-
- path_set_state(p, PATH_RUNNING);
- return;
-
-fail:
- log_warning("%s failed to queue unit startup job: %s",
- UNIT(p)->id, bus_error_message(&error, r));
- path_enter_dead(p, PATH_FAILURE_RESOURCES);
-}
-
-static bool path_check_good(Path *p, bool initial) {
- PathSpec *s;
- bool good = false;
-
- assert(p);
-
- LIST_FOREACH(spec, s, p->specs) {
- good = path_spec_check_good(s, initial);
-
- if (good)
- break;
- }
-
- return good;
-}
-
-static void path_enter_waiting(Path *p, bool initial, bool recheck) {
- int r;
-
- if (recheck)
- if (path_check_good(p, initial)) {
- log_debug("%s got triggered.", UNIT(p)->id);
- path_enter_running(p);
- return;
- }
-
- r = path_watch(p);
- if (r < 0)
- goto fail;
-
- /* Hmm, so now we have created inotify watches, but the file
- * might have appeared/been removed by now, so we must
- * recheck */
-
- if (recheck)
- if (path_check_good(p, false)) {
- log_debug("%s got triggered.", UNIT(p)->id);
- path_enter_running(p);
- return;
- }
-
- path_set_state(p, PATH_WAITING);
- return;
-
-fail:
- log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id);
- path_enter_dead(p, PATH_FAILURE_RESOURCES);
-}
-
-static void path_mkdir(Path *p) {
- PathSpec *s;
-
- assert(p);
-
- if (!p->make_directory)
- return;
-
- LIST_FOREACH(spec, s, p->specs)
- path_spec_mkdir(s, p->directory_mode);
-}
-
-static int path_start(Unit *u) {
- Path *p = PATH(u);
-
- assert(p);
- assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
-
- if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
- return -ENOENT;
-
- path_mkdir(p);
-
- p->result = PATH_SUCCESS;
- path_enter_waiting(p, true, true);
-
- return 1;
-}
-
-static int path_stop(Unit *u) {
- Path *p = PATH(u);
-
- assert(p);
- assert(p->state == PATH_WAITING || p->state == PATH_RUNNING);
-
- path_enter_dead(p, PATH_SUCCESS);
- return 1;
-}
-
-static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
- Path *p = PATH(u);
-
- assert(u);
- assert(f);
- assert(fds);
-
- unit_serialize_item(u, f, "state", path_state_to_string(p->state));
- unit_serialize_item(u, f, "result", path_result_to_string(p->result));
-
- return 0;
-}
-
-static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
- Path *p = PATH(u);
-
- assert(u);
- assert(key);
- assert(value);
- assert(fds);
-
- if (streq(key, "state")) {
- PathState state;
-
- state = path_state_from_string(value);
- if (state < 0)
- log_debug("Failed to parse state value %s", value);
- else
- p->deserialized_state = state;
-
- } else if (streq(key, "result")) {
- PathResult f;
-
- f = path_result_from_string(value);
- if (f < 0)
- log_debug("Failed to parse result value %s", value);
- else if (f != PATH_SUCCESS)
- p->result = f;
-
- } else
- log_debug("Unknown serialization key '%s'", key);
-
- return 0;
-}
-
-_pure_ static UnitActiveState path_active_state(Unit *u) {
- assert(u);
-
- return state_translation_table[PATH(u)->state];
-}
-
-_pure_ static const char *path_sub_state_to_string(Unit *u) {
- assert(u);
-
- return path_state_to_string(PATH(u)->state);
-}
-
-static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
- PathSpec *s = userdata;
- Path *p;
- int changed;
-
- assert(s);
- assert(s->unit);
- assert(fd >= 0);
-
- p = PATH(s->unit);
-
- if (p->state != PATH_WAITING &&
- p->state != PATH_RUNNING)
- return 0;
-
- /* log_debug("inotify wakeup on %s.", u->id); */
-
- LIST_FOREACH(spec, s, p->specs)
- if (path_spec_owns_inotify_fd(s, fd))
- break;
-
- if (!s) {
- log_error("Got event on unknown fd.");
- goto fail;
- }
-
- changed = path_spec_fd_event(s, revents);
- if (changed < 0)
- goto fail;
-
- /* If we are already running, then remember that one event was
- * dispatched so that we restart the service only if something
- * actually changed on disk */
- p->inotify_triggered = true;
-
- if (changed)
- path_enter_running(p);
- else
- path_enter_waiting(p, false, true);
-
- return 0;
-
-fail:
- path_enter_dead(p, PATH_FAILURE_RESOURCES);
- return 0;
-}
-
-static void path_trigger_notify(Unit *u, Unit *other) {
- Path *p = PATH(u);
-
- assert(u);
- assert(other);
-
- /* Invoked whenever the unit we trigger changes state or gains
- * or loses a job */
-
- if (other->load_state != UNIT_LOADED)
- return;
-
- if (p->state == PATH_RUNNING &&
- UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) {
- log_unit_debug(UNIT(p)->id,
- "%s got notified about unit deactivation.",
- UNIT(p)->id);
-
- /* Hmm, so inotify was triggered since the
- * last activation, so I guess we need to
- * recheck what is going on. */
- path_enter_waiting(p, false, p->inotify_triggered);
- }
-}
-
-static void path_reset_failed(Unit *u) {
- Path *p = PATH(u);
-
- assert(p);
-
- if (p->state == PATH_FAILED)
- path_set_state(p, PATH_DEAD);
-
- p->result = PATH_SUCCESS;
-}
-
-static const char* const path_state_table[_PATH_STATE_MAX] = {
- [PATH_DEAD] = "dead",
- [PATH_WAITING] = "waiting",
- [PATH_RUNNING] = "running",
- [PATH_FAILED] = "failed"
-};
-
-DEFINE_STRING_TABLE_LOOKUP(path_state, PathState);
-
-static const char* const path_type_table[_PATH_TYPE_MAX] = {
- [PATH_EXISTS] = "PathExists",
- [PATH_EXISTS_GLOB] = "PathExistsGlob",
- [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty",
- [PATH_CHANGED] = "PathChanged",
- [PATH_MODIFIED] = "PathModified",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
-
-static const char* const path_result_table[_PATH_RESULT_MAX] = {
- [PATH_SUCCESS] = "success",
- [PATH_FAILURE_RESOURCES] = "resources",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
-
-const UnitVTable path_vtable = {
- .object_size = sizeof(Path),
-
- .sections =
- "Unit\0"
- "Path\0"
- "Install\0",
-
- .init = path_init,
- .done = path_done,
- .load = path_load,
-
- .coldplug = path_coldplug,
-
- .dump = path_dump,
-
- .start = path_start,
- .stop = path_stop,
-
- .serialize = path_serialize,
- .deserialize_item = path_deserialize_item,
-
- .active_state = path_active_state,
- .sub_state_to_string = path_sub_state_to_string,
-
- .trigger_notify = path_trigger_notify,
-
- .reset_failed = path_reset_failed,
-
- .bus_interface = "org.freedesktop.systemd1.Path",
- .bus_vtable = bus_path_vtable
-};
~ianmdlvl / elogind.git / blobdiff