+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(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;
+}
+