diff options
Diffstat (limited to 'src/core/path.c')
| -rw-r--r-- | src/core/path.c | 773 |
1 files changed, 0 insertions, 773 deletions
diff --git a/src/core/path.c b/src/core/path.c deleted file mode 100644 index 3936971b41..0000000000 --- a/src/core/path.c +++ /dev/null @@ -1,773 +0,0 @@ -/*-*- 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 <sys/ioctl.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 "bus-errors.h" -#include "path-util.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 -}; - -int path_spec_watch(PathSpec *s, Unit *u) { - - 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 *k, *slash; - int r; - - assert(u); - assert(s); - - path_spec_unwatch(s, u); - - if (!(k = strdup(s->path))) - return -ENOMEM; - - if ((s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC)) < 0) { - r = -errno; - goto fail; - } - - if (unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch) < 0) { - r = -errno; - goto fail; - } - - s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type]); - if (s->primary_wd >= 0) - exists = true; - - do { - int flags; - - /* This assumes the path was passed through path_kill_slashes()! */ - slash = strrchr(k, '/'); - if (!slash) - break; - - /* Trim the path at the last slash. Keep the slash if it's the root dir. */ - slash[slash == k] = 0; - - flags = IN_MOVE_SELF; - if (!exists) - flags |= IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO; - - if (inotify_add_watch(s->inotify_fd, k, flags) >= 0) - exists = true; - } while (slash != k); - - return 0; - -fail: - free(k); - - path_spec_unwatch(s, u); - return r; -} - -void path_spec_unwatch(PathSpec *s, Unit *u) { - - if (s->inotify_fd < 0) - return; - - unit_unwatch_fd(u, &s->watch); - - close_nointr_nofail(s->inotify_fd); - s->inotify_fd = -1; -} - -int path_spec_fd_event(PathSpec *s, uint32_t events) { - uint8_t *buf = NULL; - struct inotify_event *e; - ssize_t k; - int l; - int r = 0; - - if (events != EPOLLIN) { - log_error("Got Invalid poll event on inotify."); - r = -EINVAL; - goto out; - } - - if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) { - log_error("FIONREAD failed: %m"); - r = -errno; - goto out; - } - - assert(l > 0); - - if (!(buf = malloc(l))) { - log_error("Failed to allocate buffer: %m"); - r = -errno; - goto out; - } - - if ((k = read(s->inotify_fd, buf, l)) < 0) { - log_error("Failed to read inotify event: %m"); - r = -errno; - goto out; - } - - e = (struct inotify_event*) buf; - - while (k > 0) { - size_t step; - - if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) && - s->primary_wd == e->wd) - r = 1; - - step = sizeof(struct inotify_event) + e->len; - assert(step <= (size_t) k); - - e = (struct inotify_event*) ((uint8_t*) e + step); - k -= step; - } -out: - free(buf); - 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 bool path_spec_startswith(PathSpec *s, const char *what) { - return path_startswith(s->path, what); -} - -static void path_spec_mkdir(PathSpec *s, mode_t mode) { - int r; - - if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB) - return; - - if ((r = mkdir_p_label(s->path, mode)) < 0) - log_warning("mkdir(%s) failed: %s", s->path, strerror(-r)); -} - -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; -} - -static void path_done(Unit *u) { - Path *p = PATH(u); - PathSpec *s; - - assert(p); - - unit_ref_unset(&p->unit); - - while ((s = p->specs)) { - path_spec_unwatch(s, u); - LIST_REMOVE(PathSpec, spec, p->specs, s); - path_spec_done(s); - free(s); - } -} - -int path_add_one_mount_link(Path *p, Mount *m) { - PathSpec *s; - int r; - - assert(p); - assert(m); - - if (UNIT(p)->load_state != UNIT_LOADED || - UNIT(m)->load_state != UNIT_LOADED) - return 0; - - LIST_FOREACH(spec, s, p->specs) { - - if (!path_spec_startswith(s, m->where)) - continue; - - if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) - return r; - } - - return 0; -} - -static int path_add_mount_links(Path *p) { - Unit *other; - int r; - - assert(p); - - LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT]) - if ((r = path_add_one_mount_link(p, MOUNT(other))) < 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_error("%s lacks path setting. Refusing.", UNIT(p)->id); - return -EINVAL; - } - - return 0; -} - -static int path_add_default_dependencies(Path *p) { - int r; - - assert(p); - - if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) { - if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0) - return r; - - if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 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); - - if ((r = unit_load_fragment_and_dropin(u)) < 0) - return r; - - if (u->load_state == UNIT_LOADED) { - - if (!UNIT_DEREF(p->unit)) { - Unit *x; - - r = unit_load_related_unit(u, ".service", &x); - if (r < 0) - return r; - - unit_ref_set(&p->unit, x); - } - - r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(p->unit), true); - if (r < 0) - return r; - - if ((r = path_add_mount_links(p)) < 0) - return r; - - if (UNIT(p)->default_dependencies) - if ((r = path_add_default_dependencies(p)) < 0) - return r; - } - - return path_verify(p); -} - -static void path_dump(Unit *u, FILE *f, const char *prefix) { - Path *p = PATH(u); - PathSpec *s; - - assert(p); - assert(f); - - 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, UNIT_DEREF(p->unit)->id, - 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, UNIT(p)); -} - -static int path_watch(Path *p) { - int r; - PathSpec *s; - - assert(p); - - LIST_FOREACH(spec, s, p->specs) - if ((r = path_spec_watch(s, UNIT(p))) < 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_coldplug(Unit *u) { - 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) - path_enter_waiting(p, true, true); - 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) { - int r; - DBusError error; - - assert(p); - dbus_error_init(&error); - - /* Don't start job if we are supposed to go down */ - if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP) - return; - - if ((r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit), JOB_REPLACE, true, &error, NULL)) < 0) - goto fail; - - p->inotify_triggered = false; - - if ((r = path_watch(p)) < 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(&error, r)); - path_enter_dead(p, PATH_FAILURE_RESOURCES); - - dbus_error_free(&error); -} - -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; - } - - if ((r = path_watch(p)) < 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("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r)); - 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_DEREF(p->unit)->load_state != UNIT_LOADED) - return -ENOENT; - - path_mkdir(p); - - p->result = PATH_SUCCESS; - path_enter_waiting(p, true, true); - - return 0; -} - -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 0; -} - -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; - - if ((state = path_state_from_string(value)) < 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; -} - -static UnitActiveState path_active_state(Unit *u) { - assert(u); - - return state_translation_table[PATH(u)->state]; -} - -static const char *path_sub_state_to_string(Unit *u) { - assert(u); - - return path_state_to_string(PATH(u)->state); -} - -static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { - Path *p = PATH(u); - PathSpec *s; - int changed; - - assert(p); - assert(fd >= 0); - - if (p->state != PATH_WAITING && - p->state != PATH_RUNNING) - return; - - /* 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, events); - 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; - -fail: - path_enter_dead(p, PATH_FAILURE_RESOURCES); -} - -void path_unit_notify(Unit *u, UnitActiveState new_state) { - Iterator i; - Unit *k; - - if (u->type == UNIT_PATH) - return; - - SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) { - Path *p; - - if (k->type != UNIT_PATH) - continue; - - if (k->load_state != UNIT_LOADED) - continue; - - p = PATH(k); - - if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) { - log_debug("%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_CHANGED] = "PathChanged", - [PATH_MODIFIED] = "PathModified", - [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty" -}; - -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, - - .fd_event = path_fd_event, - - .reset_failed = path_reset_failed, - - .bus_interface = "org.freedesktop.systemd1.Path", - .bus_message_handler = bus_path_message_handler, - .bus_invalidating_properties = bus_path_invalidating_properties -}; 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