X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fpath.c;h=c8086a8d1927c84e92fdd0d4ea0478b604b59d08;hp=f7878b56ae0cb9ca55d2f844219f8a9cce447847;hb=1124fe6f01b1d59d016c238026f20380f38d98dc;hpb=0595f9a1c182a84581749823ef47c5f292e545f9 diff --git a/src/path.c b/src/path.c index f7878b56a..c8086a8d1 100644 --- a/src/path.c +++ b/src/path.c @@ -39,27 +39,220 @@ static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = { [PATH_FAILED] = UNIT_FAILED }; -static void path_unwatch_one(Path *p, PathSpec *s) { +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; + } + + if ((s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type])) >= 0) + exists = true; + + do { + int flags; + + /* This assumes the path was passed through path_kill_slashes()! */ + if (!(slash = strrchr(k, '/'))) + 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(UNIT(p), &s->watch); + 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(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_unwatch_one(p, s); + path_spec_unwatch(s, u); LIST_REMOVE(PathSpec, spec, p->specs, s); - free(s->path); + path_spec_done(s); free(s); } } @@ -71,13 +264,13 @@ int path_add_one_mount_link(Path *p, Mount *m) { assert(p); assert(m); - if (p->meta.load_state != UNIT_LOADED || - m->meta.load_state != UNIT_LOADED) + if (UNIT(p)->load_state != UNIT_LOADED || + UNIT(m)->load_state != UNIT_LOADED) return 0; LIST_FOREACH(spec, s, p->specs) { - if (!path_startswith(s->path, m->where)) + if (!path_spec_startswith(s, m->where)) continue; if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) @@ -88,12 +281,12 @@ int path_add_one_mount_link(Path *p, Mount *m) { } static int path_add_mount_links(Path *p) { - Meta *other; + Unit *other; int r; assert(p); - LIST_FOREACH(units_per_type, other, p->meta.manager->units_per_type[UNIT_MOUNT]) + 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; @@ -103,11 +296,11 @@ static int path_add_mount_links(Path *p) { static int path_verify(Path *p) { assert(p); - if (p->meta.load_state != UNIT_LOADED) + if (UNIT(p)->load_state != UNIT_LOADED) return 0; if (!p->specs) { - log_error("%s lacks path setting. Refusing.", p->meta.id); + log_error("%s lacks path setting. Refusing.", UNIT(p)->id); return -EINVAL; } @@ -119,7 +312,7 @@ static int path_add_default_dependencies(Path *p) { assert(p); - if (p->meta.manager->running_as == MANAGER_SYSTEM) { + if (UNIT(p)->manager->running_as == MANAGER_SYSTEM) { if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0) return r; @@ -135,24 +328,31 @@ static int path_load(Unit *u) { int r; assert(u); - assert(u->meta.load_state == UNIT_STUB); + assert(u->load_state == UNIT_STUB); if ((r = unit_load_fragment_and_dropin(u)) < 0) return r; - if (u->meta.load_state == UNIT_LOADED) { + if (u->load_state == UNIT_LOADED) { - if (!p->unit) - if ((r = unit_load_related_unit(u, ".service", &p->unit))) + if (!UNIT_DEREF(p->unit)) { + Unit *x; + + r = unit_load_related_unit(u, ".service", &x); + if (r < 0) return r; - if ((r = unit_add_dependency(u, UNIT_BEFORE, p->unit, true)) < 0) + 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 (p->meta.default_dependencies) + if (UNIT(p)->default_dependencies) if ((r = path_add_default_dependencies(p)) < 0) return r; } @@ -169,75 +369,16 @@ static void path_dump(Unit *u, FILE *f, const char *prefix) { fprintf(f, "%sPath State: %s\n" - "%sUnit: %s\n", + "%sUnit: %s\n" + "%sMakeDirectory: %s\n" + "%sDirectoryMode: %04o\n", prefix, path_state_to_string(p->state), - prefix, p->unit->meta.id); + prefix, UNIT_DEREF(p->unit)->id, + prefix, yes_no(p->make_directory), + prefix, p->directory_mode); LIST_FOREACH(spec, s, p->specs) - fprintf(f, - "%s%s: %s\n", - prefix, - path_type_to_string(s->type), - s->path); -} - -static int path_watch_one(Path *p, PathSpec *s) { - static const int flags_table[_PATH_TYPE_MAX] = { - [PATH_EXISTS] = 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_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(p); - assert(s); - - path_unwatch_one(p, s); - - 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(UNIT(p), s->inotify_fd, EPOLLIN, &s->watch) < 0) { - r = -errno; - goto fail; - } - - if ((s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type])) >= 0) - exists = true; - - do { - int flags; - - /* This assumes the path was passed through path_kill_slashes()! */ - if (!(slash = strrchr(k, '/'))) - 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_unwatch_one(p, s); - return r; + path_spec_dump(s, f, prefix); } static void path_unwatch(Path *p) { @@ -246,7 +387,7 @@ static void path_unwatch(Path *p) { assert(p); LIST_FOREACH(spec, s, p->specs) - path_unwatch_one(p, s); + path_spec_unwatch(s, UNIT(p)); } static int path_watch(Path *p) { @@ -256,7 +397,7 @@ static int path_watch(Path *p) { assert(p); LIST_FOREACH(spec, s, p->specs) - if ((r = path_watch_one(p, s)) < 0) + if ((r = path_spec_watch(s, UNIT(p))) < 0) return r; return 0; @@ -275,14 +416,14 @@ static void path_set_state(Path *p, PathState state) { if (state != old_state) log_debug("%s changed %s -> %s", - p->meta.id, + 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, bool skip_watch); +static void path_enter_waiting(Path *p, bool initial, bool recheck); static int path_coldplug(Unit *u) { Path *p = PATH(u); @@ -294,7 +435,7 @@ static int path_coldplug(Unit *u) { if (p->deserialized_state == PATH_WAITING || p->deserialized_state == PATH_RUNNING) - path_enter_waiting(p, true, true, false); + path_enter_waiting(p, true, true); else path_set_state(p, p->deserialized_state); } @@ -319,10 +460,10 @@ static void path_enter_running(Path *p) { dbus_error_init(&error); /* Don't start job if we are supposed to go down */ - if (p->meta.job && p->meta.job->type == JOB_STOP) + if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP) return; - if ((r = manager_add_job(p->meta.manager, JOB_START, p->unit, JOB_REPLACE, true, &error, NULL)) < 0) + 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; @@ -334,91 +475,85 @@ static void path_enter_running(Path *p) { return; fail: - log_warning("%s failed to queue unit startup job: %s", p->meta.id, bus_error(&error, r)); + log_warning("%s failed to queue unit startup job: %s", UNIT(p)->id, bus_error(&error, r)); path_enter_dead(p, false); dbus_error_free(&error); } - -static void path_enter_waiting(Path *p, bool initial, bool recheck, bool skip_watch) { +static bool path_check_good(Path *p, bool initial) { PathSpec *s; - int r; bool good = false; - if (!recheck) - goto waiting; + assert(p); LIST_FOREACH(spec, s, p->specs) { + good = path_spec_check_good(s, initial); - switch (s->type) { - - case PATH_EXISTS: - good = access(s->path, F_OK) >= 0; - break; - - case PATH_DIRECTORY_NOT_EMPTY: { - int k; - - k = dir_is_empty(s->path); - good = !(k == -ENOENT || k > 0); + if (good) break; - } + } - case PATH_CHANGED: { - bool b; + return good; +} - b = access(s->path, F_OK) >= 0; - good = !initial && b != s->previous_exists; - s->previous_exists = b; - break; - } +static void path_enter_waiting(Path *p, bool initial, bool recheck) { + int r; - default: - ; + if (recheck) + if (path_check_good(p, initial)) { + log_debug("%s got triggered.", UNIT(p)->id); + path_enter_running(p); + return; } - if (good) - break; - } - - if (good) { - log_debug("%s got triggered.", p->meta.id); - path_enter_running(p); - return; - } + if ((r = path_watch(p)) < 0) + goto fail; -waiting: - if (!skip_watch) { - 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 */ - /* Hmm, so now we have created inotify watches, but the file - * might have appeared/been removed by now, so we must - * recheck */ - path_enter_waiting(p, false, true, true); - return; - } + 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", p->meta.id, strerror(-r)); + log_warning("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r)); path_enter_dead(p, false); } +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 (p->unit->meta.load_state != UNIT_LOADED) + if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED) return -ENOENT; + path_mkdir(p); + p->failure = false; - path_enter_waiting(p, true, true, false); + path_enter_waiting(p, true, true); return 0; } @@ -480,12 +615,8 @@ static const char *path_sub_state_to_string(Unit *u) { static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { Path *p = PATH(u); - int l; - ssize_t k; - uint8_t *buf = NULL; - struct inotify_event *e; PathSpec *s; - bool changed; + int changed; assert(p); assert(fd >= 0); @@ -494,15 +625,10 @@ static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { p->state != PATH_RUNNING) return; - /* log_debug("inotify wakeup on %s.", u->meta.id); */ - - if (events != EPOLLIN) { - log_error("Got Invalid poll event on inotify."); - goto fail; - } + /* log_debug("inotify wakeup on %s.", u->id); */ LIST_FOREACH(spec, s, p->specs) - if (s->inotify_fd == fd) + if (path_spec_owns_inotify_fd(s, fd)) break; if (!s) { @@ -510,102 +636,53 @@ static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { goto fail; } - if (ioctl(fd, FIONREAD, &l) < 0) { - log_error("FIONREAD failed: %s", strerror(errno)); - goto fail; - } - - if (!(buf = malloc(l))) { - log_error("Failed to allocate buffer: %s", strerror(-ENOMEM)); + changed = path_spec_fd_event(s, events); + if (changed < 0) goto fail; - } - - if ((k = read(fd, buf, l)) < 0) { - log_error("Failed to read inotify event: %s", strerror(-errno)); - 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; - e = (struct inotify_event*) buf; - - changed = false; - while (k > 0) { - size_t step; - - if (s->type == PATH_CHANGED && s->primary_wd == e->wd) - changed = true; - - step = sizeof(struct inotify_event) + e->len; - assert(step <= (size_t) k); - - e = (struct inotify_event*) ((uint8_t*) e + step); - k -= step; - } - if (changed) path_enter_running(p); else - path_enter_waiting(p, false, true, false); - - free(buf); + path_enter_waiting(p, false, true); return; fail: - free(buf); path_enter_dead(p, false); } void path_unit_notify(Unit *u, UnitActiveState new_state) { - char *n; - int r; Iterator i; + Unit *k; - if (u->meta.type == UNIT_PATH) + if (u->type == UNIT_PATH) return; - SET_FOREACH(n, u->meta.names, i) { - char *k; - Unit *t; + SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) { Path *p; - if (!(k = unit_name_change_suffix(n, ".path"))) { - r = -ENOMEM; - goto fail; - } - - t = manager_get_unit(u->meta.manager, k); - free(k); - - if (!t) + if (k->type != UNIT_PATH) continue; - if (t->meta.load_state != UNIT_LOADED) + if (k->load_state != UNIT_LOADED) continue; - p = PATH(t); - - if (p->unit != u) - continue; + p = PATH(k); if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) { - log_debug("%s got notified about unit deactivation.", p->meta.id); + 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, false); + path_enter_waiting(p, false, p->inotify_triggered); } } - - return; - -fail: - log_error("Failed find path unit: %s", strerror(-r)); } static void path_reset_failed(Unit *u) { @@ -630,7 +707,9 @@ 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" }; @@ -638,7 +717,13 @@ DEFINE_STRING_TABLE_LOOKUP(path_type, PathType); const UnitVTable path_vtable = { .suffix = ".path", + .object_size = sizeof(Path), + .sections = + "Unit\0" + "Path\0" + "Install\0", + .init = path_init, .done = path_done, .load = path_load,