+static bool resource_is_resolved(struct resource *res)
+{
+ return !res || res->resolved;
+}
+
+/* We only use this in an assert, which will disappear if we're compiling
+ * with NDEBUG, so we need the 'used' attribute for these builds */
+static bool __attribute__((used)) boot_option_is_resolved(
+ struct discover_boot_option *opt)
+{
+ return resource_is_resolved(opt->boot_image) &&
+ resource_is_resolved(opt->initrd) &&
+ resource_is_resolved(opt->icon);
+}
+
+static bool resource_resolve(struct resource *res, struct parser *parser,
+ struct device_handler *handler)
+{
+ if (resource_is_resolved(res))
+ return true;
+
+ parser->resolve_resource(handler, res);
+
+ return res->resolved;
+}
+
+static bool boot_option_resolve(struct discover_boot_option *opt,
+ struct device_handler *handler)
+{
+ return resource_resolve(opt->boot_image, opt->source, handler) &&
+ resource_resolve(opt->initrd, opt->source, handler) &&
+ resource_resolve(opt->icon, opt->source, handler);
+}
+
+static void boot_option_finalise(struct discover_boot_option *opt)
+{
+ assert(boot_option_is_resolved(opt));
+
+ /* check that the parsers haven't set any of the final data */
+ assert(!opt->option->boot_image_file);
+ assert(!opt->option->initrd_file);
+ assert(!opt->option->icon_file);
+
+ if (opt->boot_image)
+ opt->option->boot_image_file = opt->boot_image->url->full;
+ if (opt->initrd)
+ opt->option->initrd_file = opt->initrd->url->full;
+ if (opt->icon)
+ opt->option->icon_file = opt->icon->url->full;
+}
+
+static void process_boot_option_queue(struct device_handler *handler)
+{
+ struct discover_boot_option *opt, *tmp;
+
+ list_for_each_entry_safe(&handler->unresolved_boot_options,
+ opt, tmp, list) {
+
+ if (!boot_option_resolve(opt, handler))
+ continue;
+
+ list_remove(&opt->list);
+ list_add(&opt->device->boot_options, &opt->list);
+ talloc_steal(opt->device, opt);
+ boot_option_finalise(opt);
+ discover_server_notify_boot_option_add(handler->server,
+ opt->option);
+ }
+}
+
+/**
+ * context_commit - Commit a temporary discovery context to the handler,
+ * and notify the clients about any new options / devices
+ */
+static void context_commit(struct device_handler *handler,
+ struct discover_context *ctx)
+{
+ struct discover_device *dev = ctx->device;
+ struct discover_boot_option *opt, *tmp;
+ unsigned int i, existing_device = 0;
+
+ /* do we already have this device? */
+ for (i = 0; i < handler->n_devices; i++) {
+ if (ctx->device == handler->devices[i]) {
+ existing_device = 1;
+ break;
+ }
+ }
+
+ /* if not already present, add the device to the handler's array */
+ if (!existing_device) {
+ handler->n_devices++;
+ handler->devices = talloc_realloc(handler, handler->devices,
+ struct discover_device *, handler->n_devices);
+ handler->devices[handler->n_devices - 1] = dev;
+ talloc_steal(handler, dev);
+
+ discover_server_notify_device_add(handler->server, dev->device);
+
+ /* this new device might be able to resolve existing boot
+ * options */
+ process_boot_option_queue(handler);
+ }
+
+
+ /* move boot options from the context to the device */
+ list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
+ list_remove(&opt->list);
+
+ if (boot_option_resolve(opt, handler)) {
+ list_add(&dev->boot_options, &opt->list);
+ talloc_steal(dev, opt);
+ boot_option_finalise(opt);
+ discover_server_notify_boot_option_add(handler->server,
+ opt->option);
+ } else {
+ if (!opt->source->resolve_resource) {
+ pb_log("parser %s gave us an unresolved "
+ "resource (%s), but no way to "
+ "resolve it\n",
+ opt->source->name, opt->option->id);
+ talloc_free(opt);
+ } else {
+ list_add(&handler->unresolved_boot_options,
+ &opt->list);
+ talloc_steal(handler, opt);
+ }
+ }
+ }
+}
+
+void discover_context_add_boot_option(struct discover_context *ctx,
+ struct discover_boot_option *boot_option)
+{
+ boot_option->source = ctx->parser;
+ list_add(&ctx->boot_options, &boot_option->list);
+ talloc_steal(ctx, boot_option);
+}
+
+/**
+ * device_handler_remove - Remove a device from the handler device array.
+ */
+
+static void device_handler_remove(struct device_handler *handler,
+ struct discover_device *device)
+{
+ unsigned int i;
+
+ for (i = 0; i < handler->n_devices; i++)
+ if (handler->devices[i] == device)
+ break;
+
+ if (i == handler->n_devices) {
+ assert(0 && "unknown device");
+ return;
+ }
+
+ handler->n_devices--;
+ memmove(&handler->devices[i], &handler->devices[i + 1],
+ (handler->n_devices - i) * sizeof(handler->devices[0]));
+ handler->devices = talloc_realloc(handler, handler->devices,
+ struct discover_device *, handler->n_devices);
+
+ discover_server_notify_device_remove(handler->server, device->device);
+
+ talloc_free(device);
+}
+
+/**
+ * device_handler_get_device_count - Get the count of current handler devices.
+ */
+
+int device_handler_get_device_count(const struct device_handler *handler)
+{
+ return handler->n_devices;
+}
+
+/**
+ * device_handler_get_device - Get a handler device by index.
+ */
+
+const struct discover_device *device_handler_get_device(
+ const struct device_handler *handler, unsigned int index)
+{
+ if (index >= handler->n_devices) {
+ assert(0 && "bad index");
+ return NULL;
+ }
+
+ return handler->devices[index];
+}
+
+static int mount_device(struct discover_device *dev)
+{
+ const char *argv[6];
+
+ if (!dev->mount_path)
+ dev->mount_path = join_paths(dev, mount_base(),
+ dev->device_path);
+
+ if (pb_mkdir_recursive(dev->mount_path))
+ pb_log("couldn't create mount directory %s: %s\n",
+ dev->mount_path, strerror(errno));
+
+ argv[0] = pb_system_apps.mount;
+ argv[1] = dev->device_path;
+ argv[2] = dev->mount_path;
+ argv[3] = "-o";
+ argv[4] = "ro";
+ argv[5] = NULL;
+
+ if (pb_run_cmd(argv, 1, 0)) {
+
+ /* Retry mount without ro option. */
+
+ argv[0] = pb_system_apps.mount;
+ argv[1] = dev->device_path;
+ argv[2] = dev->mount_path;
+ argv[3] = NULL;
+
+ if (pb_run_cmd(argv, 1, 0))
+ goto out_rmdir;
+ }
+
+ return 0;
+
+out_rmdir:
+ pb_rmdir_recursive(mount_base(), dev->mount_path);
+ return -1;
+}
+
+static int umount_device(struct discover_device *dev)
+{
+ int status;
+ pid_t pid;
+
+ if (!dev->mount_path)
+ return 0;
+
+ pid = fork();
+ if (pid == -1) {
+ pb_log("%s: fork failed: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+
+ if (pid == 0) {
+ execl(pb_system_apps.umount, pb_system_apps.umount,
+ dev->mount_path, NULL);
+ exit(EXIT_FAILURE);
+ }
+
+ if (waitpid(pid, &status, 0) == -1) {
+ pb_log("%s: waitpid failed: %s\n", __func__,
+ strerror(errno));
+ return -1;
+ }
+
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
+ return -1;
+
+ pb_rmdir_recursive(mount_base(), dev->mount_path);
+
+ return 0;
+}
+
+static struct discover_device *find_device(struct device_handler *handler,
+ const char *id)
+{
+ struct discover_device *dev;
+ unsigned int i;
+
+ for (i = 0; i < handler->n_devices; i++) {
+ dev = handler->devices[i];
+ if (!strcmp(dev->device->id, id))
+ return dev;
+ }
+
+ return NULL;
+}
+
+static int destroy_device(void *arg)
+{
+ struct discover_device *dev = arg;
+
+ umount_device(dev);
+
+ return 0;
+}
+
+static struct discover_device *discover_device_create(
+ struct device_handler *handler,
+ struct discover_context *ctx,
+ struct event *event)
+{
+ struct discover_device *dev;
+ const char *devname;
+
+ dev = find_device(handler, event->device);
+ if (dev)
+ return dev;
+
+ dev = talloc_zero(ctx, struct discover_device);
+ dev->device = talloc_zero(dev, struct device);
+ list_init(&dev->boot_options);
+
+ devname = event_get_param(ctx->event, "DEVNAME");
+ if (devname)
+ dev->device_path = talloc_strdup(dev, devname);
+
+ dev->device->id = talloc_strdup(dev, event->device);
+
+ talloc_set_destructor(dev, destroy_device);
+
+ return dev;
+}
+
+struct discover_boot_option *discover_boot_option_create(
+ struct discover_context *ctx,
+ struct discover_device *device)
+{
+ struct discover_boot_option *opt;
+
+ opt = talloc_zero(ctx, struct discover_boot_option);
+ opt->option = talloc_zero(opt, struct boot_option);
+ opt->device = device;
+
+ return opt;
+}
+
+
+static int handle_add_udev_event(struct device_handler *handler,
+ struct event *event)
+{
+ struct discover_context *ctx;
+ struct discover_device *dev;
+ const char *param;
+ int rc;
+
+ /* create our context */
+ ctx = talloc(handler, struct discover_context);
+ ctx->event = event;
+ list_init(&ctx->boot_options);
+
+ /* create our top-level device */
+ dev = discover_device_create(handler, ctx, event);
+
+ ctx->device = dev;
+
+ /* try to parse UUID and labels */
+ param = event_get_param(ctx->event, "ID_FS_UUID");
+ if (param)
+ dev->uuid = talloc_strdup(dev, param);
+
+ param = event_get_param(ctx->event, "ID_FS_LABEL");
+ if (param)
+ dev->label = talloc_strdup(dev, param);
+
+ rc = mount_device(dev);
+ if (rc) {
+ talloc_free(ctx);
+ return 0;
+ }
+
+ /* run the parsers. This will populate the ctx's boot_option list. */
+ iterate_parsers(ctx, CONF_METHOD_LOCAL_FILE);
+
+ /* add discovered stuff to the handler */
+ context_commit(handler, ctx);
+
+ talloc_free(ctx);
+
+ return 0;
+}
+
+static int handle_remove_udev_event(struct device_handler *handler,
+ struct event *event)
+{
+ struct discover_device *dev;
+
+ dev = find_device(handler, event->device);
+ if (!dev)
+ return 0;
+
+ /* remove device from handler device array */
+ device_handler_remove(handler, dev);
+
+ return 0;
+}
+
+static int handle_add_user_event(struct device_handler *handler,
+ struct event *event)
+{
+ struct discover_context *ctx;
+ struct discover_device *dev;
+ int rc;
+
+ assert(event->device);
+
+ ctx = talloc(handler, struct discover_context);
+ ctx->event = event;
+ list_init(&ctx->boot_options);
+
+ dev = discover_device_create(handler, ctx, event);
+ ctx->device = dev;
+
+ rc = parse_user_event(ctx, event);
+
+ if (!rc)
+ context_commit(handler, ctx);
+
+ return rc;
+}
+
+static int handle_remove_user_event(struct device_handler *handler,
+ struct event *event)
+{
+ struct discover_device *dev = find_device(handler, event->device);
+
+ if (!dev)
+ return 0;
+
+ /* remove device from handler device array */
+ device_handler_remove(handler, dev);
+
+ return 0;
+}
+
+static enum conf_method parse_conf_method(const char *str)
+{
+
+ if (!strcasecmp(str, "dhcp")) {
+ return CONF_METHOD_DHCP;
+ }
+ return CONF_METHOD_UNKNOWN;
+}
+
+static int handle_conf_user_event(struct device_handler *handler,
+ struct event *event)
+{
+ struct discover_context *ctx;
+ struct discover_device *dev;
+ enum conf_method method;
+ const char *val;
+
+ ctx = talloc(handler, struct discover_context);
+ ctx->event = event;
+ list_init(&ctx->boot_options);
+
+ val = event_get_param(event, "url");
+ if (!val) {
+ talloc_free(ctx);
+ return 0;
+ }
+
+ ctx->conf_url = pb_url_parse(ctx, val);
+ if (!ctx->conf_url) {
+ talloc_free(ctx);
+ return 0;
+ }
+
+ val = event_get_param(event, "method");
+ if (!val) {
+ talloc_free(ctx);
+ return 0;
+ }
+
+ method = parse_conf_method(val);
+ if (method == CONF_METHOD_UNKNOWN) {
+ talloc_free(ctx);
+ return 0;
+ }
+
+ dev = discover_device_create(handler, ctx, event);
+ ctx->device = dev;
+
+ iterate_parsers(ctx, method);
+
+ context_commit(handler, ctx);
+
+ return 0;
+}
+
+typedef int (*event_handler)(struct device_handler *, struct event *);
+
+static event_handler handlers[EVENT_TYPE_MAX][EVENT_ACTION_MAX] = {
+ [EVENT_TYPE_UDEV] = {
+ [EVENT_ACTION_ADD] = handle_add_udev_event,
+ [EVENT_ACTION_REMOVE] = handle_remove_udev_event,
+ },
+ [EVENT_TYPE_USER] = {
+ [EVENT_ACTION_ADD] = handle_add_user_event,
+ [EVENT_ACTION_REMOVE] = handle_remove_user_event,
+ [EVENT_ACTION_CONF] = handle_conf_user_event,
+ }
+};
+
+int device_handler_event(struct device_handler *handler,
+ struct event *event)
+{
+ if (event->type >= EVENT_TYPE_MAX ||
+ event->action >= EVENT_ACTION_MAX ||
+ !handlers[event->type][event->action]) {
+ pb_log("%s unknown type/action: %d/%d\n", __func__,
+ event->type, event->action);
+ return 0;
+ }
+
+ return handlers[event->type][event->action](handler, event);
+}
+
+struct device_handler *device_handler_init(struct discover_server *server,
+ int dry_run)