X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fdevice-handler.c;h=a6dbf63e88a07635575e93c24473d3fd24eed9c5;hp=29c237131a4a267c25c11ce28e3f55d1b7c3ec95;hb=d2d7d2911c4d97edd31f6596365e6c5249768a99;hpb=a79f81caba3886b5f49ebb578f0c71a42a74adfa

diff --git a/discover/device-handler.c b/discover/device-handler.c
index 29c2371..a6dbf63 100644
--- a/discover/device-handler.c
+++ b/discover/device-handler.c
@@ -1,4 +1,5 @@
 
+#include <assert.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
@@ -6,227 +7,253 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 
+#include <pb-config/pb-config.h>
 #include <talloc/talloc.h>
 #include <list/list.h>
 #include <log/log.h>
-#include <pb-protocol/pb-protocol.h>
+#include <types/types.h>
+#include <system/system.h>
+#include <url/url.h>
 
 #include "device-handler.h"
 #include "discover-server.h"
+#include "event.h"
 #include "parser.h"
+#include "resource.h"
 #include "udev.h"
 #include "paths.h"
-
-#define MOUNT_BIN "/bin/mount"
-
-#define UMOUNT_BIN "/bin/umount"
+#include "boot.h"
 
 struct device_handler {
-	struct discover_server *server;
+	struct discover_server	*server;
+	int			dry_run;
 
-	struct device *devices;
-	int n_devices;
+	struct discover_device	**devices;
+	unsigned int		n_devices;
 
-	struct list contexts;
-};
+	struct waitset		*waitset;
+	struct waiter		*timeout_waiter;
+	bool			default_enabled;
+	unsigned int		sec_to_boot;
 
-struct mount_map {
-	char *device_path;
-	char *mount_point;
+	struct discover_boot_option *default_boot_option;
+	struct list		unresolved_boot_options;
 };
 
-int device_handler_get_current_devices(struct device_handler *handler,
-	const struct device **devices)
+void discover_context_add_boot_option(struct discover_context *ctx,
+		struct discover_boot_option *boot_option)
 {
-	*devices = handler->devices;
-	return handler->n_devices;
+	boot_option->source = ctx->parser;
+	list_add_tail(&ctx->boot_options, &boot_option->list);
+	talloc_steal(ctx, boot_option);
 }
 
-static int mkdir_recursive(const char *dir)
+/**
+ * device_handler_get_device_count - Get the count of current handler devices.
+ */
+
+int device_handler_get_device_count(const struct device_handler *handler)
 {
-	struct stat statbuf;
-	char *str, *sep;
-	int mode = 0755;
+	return handler->n_devices;
+}
 
-	if (!*dir)
-		return 0;
+/**
+ * device_handler_get_device - Get a handler device by index.
+ */
 
-	if (!stat(dir, &statbuf)) {
-		if (!S_ISDIR(statbuf.st_mode)) {
-			pb_log("%s: %s exists, but isn't a directory\n",
-					__func__, dir);
-			return -1;
-		}
-		return 0;
+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;
 	}
 
-	str = talloc_strdup(NULL, dir);
-	sep = strchr(*str == '/' ? str + 1 : str, '/');
+	return handler->devices[index];
+}
 
-	while (1) {
+struct discover_boot_option *discover_boot_option_create(
+		struct discover_context *ctx,
+		struct discover_device *device)
+{
+	struct discover_boot_option *opt;
 
-		/* terminate the path at sep */
-		if (sep)
-			*sep = '\0';
+	opt = talloc_zero(ctx, struct discover_boot_option);
+	opt->option = talloc_zero(opt, struct boot_option);
+	opt->device = device;
 
-		if (mkdir(str, mode) && errno != EEXIST) {
-			pb_log("mkdir(%s): %s\n", str, strerror(errno));
-			return -1;
-		}
+	return opt;
+}
 
-		if (!sep)
-			break;
+static int device_match_path(struct discover_device *dev, const char *path)
+{
+	return dev->device_path && !strcmp(dev->device_path, path);
+}
 
-		/* reset dir to the full path */
-		strcpy(str, dir);
-		sep = strchr(sep + 1, '/');
-	}
+static int device_match_uuid(struct discover_device *dev, const char *uuid)
+{
+	return dev->uuid && !strcmp(dev->uuid, uuid);
+}
 
-	talloc_free(str);
+static int device_match_label(struct discover_device *dev, const char *label)
+{
+	return dev->label && !strcmp(dev->label, label);
+}
 
-	return 0;
+static int device_match_id(struct discover_device *dev, const char *id)
+{
+	return !strcmp(dev->device->id, id);
 }
 
-static int rmdir_recursive(const char *base, const char *dir)
+static struct discover_device *device_lookup(
+		struct device_handler *device_handler,
+		int (match_fn)(struct discover_device *, const char *),
+		const char *str)
 {
-	char *cur, *pos;
+	struct discover_device *dev;
+	unsigned int i;
 
-	/* sanity check: make sure that dir is within base */
-	if (strncmp(base, dir, strlen(base)))
-		return -1;
+	if (!str)
+		return NULL;
 
-	cur = talloc_strdup(NULL, dir);
+	for (i = 0; i < device_handler->n_devices; i++) {
+		dev = device_handler->devices[i];
 
-	while (strcmp(base, dir)) {
+		if (match_fn(dev, str))
+			return dev;
+	}
 
-		rmdir(dir);
+	return NULL;
+}
 
-		/* null-terminate at the last slash */
-		pos = strrchr(dir, '/');
-		if (!pos)
-			break;
+struct discover_device *device_lookup_by_name(struct device_handler *handler,
+		const char *name)
+{
+	struct discover_device *dev;
+	char *path;
 
-		*pos = '\0';
-	}
+	if (strncmp(name, "/dev/", strlen("/dev/")))
+		path = talloc_asprintf(NULL, "/dev/%s", name);
+	else
+		path = talloc_strdup(NULL, name);
 
-	talloc_free(cur);
+	dev = device_lookup_by_path(handler, path);
 
-	return 0;
-}
+	talloc_free(path);
 
-static void setup_device_links(struct discover_context *ctx)
-{
-	struct link {
-		char *env, *dir;
-	} *link, links[] = {
-		{
-			.env = "ID_FS_UUID",
-			.dir = "disk/by-uuid"
-		},
-		{
-			.env = "ID_FS_LABEL",
-			.dir = "disk/by-label"
-		},
-		{
-			.env = NULL
-		}
-	};
+	return dev;
+}
 
-	for (link = links; link->env; link++) {
-		char *enc, *dir, *path;
-		const char *value;
+struct discover_device *device_lookup_by_path(
+		struct device_handler *device_handler,
+		const char *path)
+{
+	return device_lookup(device_handler, device_match_path, path);
+}
 
-		value = udev_event_param(ctx->event, link->env);
-		if (!value || !*value)
-			continue;
+struct discover_device *device_lookup_by_uuid(
+		struct device_handler *device_handler,
+		const char *uuid)
+{
+	return device_lookup(device_handler, device_match_uuid, uuid);
+}
 
-		enc = encode_label(ctx, value);
-		dir = join_paths(ctx, mount_base(), link->dir);
-		path = join_paths(ctx, dir, value);
-
-		if (!mkdir_recursive(dir)) {
-			unlink(path);
-			if (symlink(ctx->mount_path, path)) {
-				pb_log("symlink(%s,%s): %s\n",
-						ctx->mount_path, path,
-						strerror(errno));
-				talloc_free(path);
-			} else {
-				int i = ctx->n_links++;
-				ctx->links = talloc_realloc(ctx,
-						ctx->links, char *,
-						ctx->n_links);
-				ctx->links[i] = path;
-			}
+struct discover_device *device_lookup_by_label(
+		struct device_handler *device_handler,
+		const char *label)
+{
+	return device_lookup(device_handler, device_match_label, label);
+}
 
-		}
+struct discover_device *device_lookup_by_id(
+		struct device_handler *device_handler,
+		const char *id)
+{
+	return device_lookup(device_handler, device_match_id, id);
+}
 
-		talloc_free(dir);
-		talloc_free(enc);
-	}
+void device_handler_destroy(struct device_handler *handler)
+{
+	talloc_free(handler);
 }
 
-static void remove_device_links(struct discover_context *ctx)
+#ifdef PETITBOOT_TEST
+
+/* we have a simplified interface for petitboot testing, but still want
+ * to keep struct device_handler opaque. */
+struct device_handler *device_handler_init(
+		struct discover_server *server __attribute__((unused)),
+		struct waitset *waitset __attribute__((unused)),
+		int dry_run __attribute__((unused)))
 {
-	int i;
+	struct device_handler *handler;
 
-	for (i = 0; i < ctx->n_links; i++)
-		unlink(ctx->links[i]);
+	handler = talloc_zero(NULL, struct device_handler);
+	list_init(&handler->unresolved_boot_options);
+
+	return handler;
 }
 
-static int mount_device(struct discover_context *ctx)
+void device_handler_add_device(struct device_handler *handler,
+		struct discover_device *dev)
 {
-	const char *mountpoint;
-	int status;
-	pid_t pid;
+	handler->n_devices++;
+	handler->devices = talloc_realloc(handler, handler->devices,
+		struct discover_device *, handler->n_devices);
+	handler->devices[handler->n_devices - 1] = dev;
+}
 
-	if (!ctx->mount_path) {
-		mountpoint = mountpoint_for_device(ctx->device_path);
-		ctx->mount_path = talloc_strdup(ctx, mountpoint);
-	}
+#else
 
-	if (mkdir_recursive(ctx->mount_path))
+static int mount_device(struct discover_device *dev)
+{
+	const char *argv[6];
+
+	if (!dev->device_path)
+		return -1;
+
+	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",
-				ctx->mount_path, strerror(errno));
+				dev->mount_path, strerror(errno));
 
-	pid = fork();
-	if (pid == -1) {
-		pb_log("%s: fork failed: %s\n", __func__, strerror(errno));
-		goto out_rmdir;
-	}
+	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 (pid == 0) {
-		execl(MOUNT_BIN, MOUNT_BIN, ctx->device_path, ctx->mount_path,
-				"-o", "ro", NULL);
-		exit(EXIT_FAILURE);
-	}
+	if (pb_run_cmd(argv, 1, 0)) {
 
-	if (waitpid(pid, &status, 0) == -1) {
-		pb_log("%s: waitpid failed: %s\n", __func__,
-				strerror(errno));
-		goto out_rmdir;
-	}
+		/* 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 (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
-		pb_log("%s: mount failed (%d): %s\n", __func__,
-			WEXITSTATUS(status), ctx->event->device);
-		goto out_rmdir;
+		if (pb_run_cmd(argv, 1, 0))
+			goto out_rmdir;
 	}
 
-	setup_device_links(ctx);
 	return 0;
 
 out_rmdir:
-	rmdir_recursive(mount_base(), ctx->mount_path);
+	pb_rmdir_recursive(mount_base(), dev->mount_path);
 	return -1;
 }
 
-static int umount_device(struct discover_context *ctx)
+static int umount_device(struct discover_device *dev)
 {
 	int status;
 	pid_t pid;
 
-	remove_device_links(ctx);
+	if (!dev->mount_path)
+		return 0;
 
 	pid = fork();
 	if (pid == -1) {
@@ -235,7 +262,8 @@ static int umount_device(struct discover_context *ctx)
 	}
 
 	if (pid == 0) {
-		execl(UMOUNT_BIN, UMOUNT_BIN, ctx->mount_path, NULL);
+		execl(pb_system_apps.umount, pb_system_apps.umount,
+						dev->mount_path, NULL);
 		exit(EXIT_FAILURE);
 	}
 
@@ -248,134 +276,569 @@ static int umount_device(struct discover_context *ctx)
 	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 		return -1;
 
-	rmdir_recursive(mount_base(), ctx->mount_path);
+	pb_rmdir_recursive(mount_base(), dev->mount_path);
 
 	return 0;
 }
 
-static struct discover_context *find_context(struct device_handler *handler,
+struct device_handler *device_handler_init(struct discover_server *server,
+		struct waitset *waitset, int dry_run)
+{
+	struct device_handler *handler;
+
+	handler = talloc(NULL, struct device_handler);
+	handler->devices = NULL;
+	handler->n_devices = 0;
+	handler->server = server;
+	handler->waitset = waitset;
+	handler->dry_run = dry_run;
+	handler->default_boot_option = NULL;
+	handler->default_enabled = config_get()->autoboot_enabled;
+	list_init(&handler->unresolved_boot_options);
+
+	/* set up our mount point base */
+	pb_mkdir_recursive(mount_base());
+
+	parser_init();
+
+	return handler;
+}
+
+static int destroy_device(void *arg)
+{
+	struct discover_device *dev = arg;
+
+	umount_device(dev);
+
+	return 0;
+}
+
+static struct discover_device *find_device(struct device_handler *handler,
 		const char *id)
 {
-	struct discover_context *ctx;
+	struct discover_device *dev;
+	unsigned int i;
 
-	list_for_each_entry(&handler->contexts, ctx, list) {
-		if (!strcmp(ctx->id, id))
-			return ctx;
+	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_context(void *arg)
+static struct discover_device *discover_device_create(
+		struct device_handler *handler,
+		struct discover_context *ctx,
+		struct event *event)
 {
-	struct discover_context *ctx = arg;
+	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;
+}
+
+/**
+ * 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);
+}
+
+static void boot_status(void *arg, struct boot_status *status)
+{
+	struct device_handler *handler = arg;
+
+	discover_server_notify_boot_status(handler->server, status);
+}
+
+static void countdown_status(struct device_handler *handler,
+		struct discover_boot_option *opt, unsigned int sec)
+{
+	struct boot_status status;
+
+	status.type = BOOT_STATUS_INFO;
+	status.progress = -1;
+	status.detail = NULL;
+	status.message = talloc_asprintf(handler,
+			"Booting %s in %d sec", opt->option->name, sec);
+
+	discover_server_notify_boot_status(handler->server, &status);
+
+	talloc_free(status.message);
+}
+
+static int default_timeout(void *arg)
+{
+	struct device_handler *handler = arg;
+	struct discover_boot_option *opt;
+
+	if (!handler->default_boot_option)
+		return 0;
+
+	opt = handler->default_boot_option;
+
+	if (handler->sec_to_boot) {
+		countdown_status(handler, opt, handler->sec_to_boot);
+		handler->sec_to_boot--;
+		handler->timeout_waiter = waiter_register_timeout(
+						handler->waitset, 1000,
+						default_timeout, handler);
+		return 0;
+	}
 
-	list_remove(&ctx->list);
-	umount_device(ctx);
+	pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 
+	boot(handler, handler->default_boot_option, NULL,
+			handler->dry_run, boot_status, handler);
 	return 0;
 }
 
-static int handle_add_event(struct device_handler *handler,
-		struct udev_event *event)
+static void set_default(struct device_handler *handler,
+		struct discover_boot_option *opt)
+{
+	if (handler->default_boot_option)
+		return;
+
+	if (!handler->default_enabled)
+		return;
+
+	pb_log("Boot option %s set as default\n", opt->option->id);
+
+	handler->default_boot_option = opt;
+	handler->sec_to_boot = DEFAULT_BOOT_TIMEOUT_SEC;
+	default_timeout(handler);
+}
+
+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->dtb) &&
+		resource_is_resolved(opt->icon);
+}
+
+static bool resource_resolve(struct resource *res, const char *name,
+		struct discover_boot_option *opt,
+		struct device_handler *handler)
+{
+	struct parser *parser = opt->source;
+
+	if (resource_is_resolved(res))
+		return true;
+
+	pb_log("Attempting to resolve resource %s->%s with parser %s\n",
+			opt->option->id, name, parser->name);
+	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, "boot_image", opt, handler) &&
+		resource_resolve(opt->initrd, "initrd", opt, handler) &&
+		resource_resolve(opt->dtb, "dtb", opt, handler) &&
+		resource_resolve(opt->icon, "icon", opt, handler);
+}
+
+static void boot_option_finalise(struct device_handler *handler,
+		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->dtb_file);
+	assert(!opt->option->icon_file);
+	assert(!opt->option->device_id);
+
+	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->dtb)
+		opt->option->dtb_file = opt->dtb->url->full;
+	if (opt->icon)
+		opt->option->icon_file = opt->icon->url->full;
+
+	opt->option->device_id = opt->device->device->id;
+
+	if (opt->option->is_default)
+		set_default(handler, opt);
+}
+
+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) {
+
+		pb_log("queue: attempting resolution for %s\n",
+				opt->option->id);
+
+		if (!boot_option_resolve(opt, handler))
+			continue;
+
+		pb_log("\tresolved!\n");
+
+		list_remove(&opt->list);
+		list_add_tail(&opt->device->boot_options, &opt->list);
+		talloc_steal(opt->device, opt);
+		boot_option_finalise(handler, 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 */
+		pb_log("New device %s, processing queue\n", dev->device->id);
+		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)) {
+			pb_log("boot option %s is resolved, "
+					"sending to clients\n",
+					opt->option->id);
+			list_add_tail(&dev->boot_options, &opt->list);
+			talloc_steal(dev, opt);
+			boot_option_finalise(handler, 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 {
+				pb_log("boot option %s is unresolved, "
+						"adding to queue\n",
+						opt->option->id);
+				list_add(&handler->unresolved_boot_options,
+						&opt->list);
+				talloc_steal(handler, opt);
+			}
+		}
+	}
+}
+
+static int handle_add_udev_event(struct device_handler *handler,
+		struct event *event)
 {
 	struct discover_context *ctx;
-	const char *devname;
+	struct discover_device *dev;
+	const char *param;
 	int rc;
 
 	/* create our context */
 	ctx = talloc(handler, struct discover_context);
 	ctx->event = event;
-	ctx->mount_path = NULL;
-	ctx->links = NULL;
-	ctx->n_links = 0;
+	list_init(&ctx->boot_options);
 
-	ctx->id = talloc_strdup(ctx, event->device);
+	/* create our top-level device */
+	dev = discover_device_create(handler, ctx, event);
 
-	devname = udev_event_param(ctx->event, "DEVNAME");
-	if (!devname) {
-		pb_log("no devname for %s?\n", event->device);
-		return 0;
-	}
+	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);
 
-	ctx->device_path = talloc_strdup(ctx, devname);
+	param = event_get_param(ctx->event, "ID_FS_LABEL");
+	if (param)
+		dev->label = talloc_strdup(dev, param);
 
-	rc = mount_device(ctx);
+	rc = mount_device(dev);
 	if (rc) {
 		talloc_free(ctx);
 		return 0;
 	}
 
-	list_add(&handler->contexts, &ctx->list);
-	talloc_set_destructor(ctx, destroy_context);
+	/* run the parsers. This will populate the ctx's boot_option list. */
+	iterate_parsers(ctx, CONF_METHOD_LOCAL_FILE);
 
-	/* set up the top-level device */
-	ctx->device = talloc_zero(ctx, struct device);
-	ctx->device->id = talloc_strdup(ctx->device, ctx->id);
-	list_init(&ctx->device->boot_options);
+	/* add discovered stuff to the handler */
+	context_commit(handler, ctx);
 
-	/* run the parsers */
-	iterate_parsers(ctx);
+	talloc_free(ctx);
 
-	discover_server_notify_add(handler->server, ctx->device);
+	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_remove_event(struct device_handler *handler,
-		struct udev_event *event)
+static int handle_add_user_event(struct device_handler *handler,
+		struct event *event)
 {
 	struct discover_context *ctx;
+	struct discover_device *dev;
+	int rc;
 
-	ctx = find_context(handler, event->device);
-	if (!ctx)
-		return 0;
+	assert(event->device);
+
+	ctx = talloc(handler, struct discover_context);
+	ctx->event = event;
+	list_init(&ctx->boot_options);
 
-	discover_server_notify_remove(handler->server, ctx->device);
+	dev = discover_device_create(handler, ctx, event);
+	ctx->device = dev;
 
-	talloc_free(ctx);
+	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;
 }
 
-int device_handler_event(struct device_handler *handler,
-		struct udev_event *event)
+static enum conf_method parse_conf_method(const char *str)
 {
-	int rc;
 
-	switch (event->action) {
-	case UDEV_ACTION_ADD:
-		rc = handle_add_event(handler, event);
-		break;
+	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);
 
-	case UDEV_ACTION_REMOVE:
-		rc = handle_remove_event(handler, event);
-		break;
+	val = event_get_param(event, "url");
+	if (!val) {
+		talloc_free(ctx);
+		return 0;
 	}
 
-	return rc;
+	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;
 }
 
-struct device_handler *device_handler_init(struct discover_server *server)
+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)
 {
-	struct device_handler *handler;
+	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;
+	}
 
-	handler = talloc(NULL, struct device_handler);
-	handler->devices = NULL;
-	handler->n_devices = 0;
-	handler->server = server;
+	return handlers[event->type][event->action](handler, event);
+}
 
-	list_init(&handler->contexts);
+static struct discover_boot_option *find_boot_option_by_id(
+		struct device_handler *handler, const char *id)
+{
+	unsigned int i;
 
-	/* set up our mount point base */
-	mkdir_recursive(mount_base());
+	for (i = 0; i < handler->n_devices; i++) {
+		struct discover_device *dev = handler->devices[i];
+		struct discover_boot_option *opt;
 
-	parser_init();
+		list_for_each_entry(&dev->boot_options, opt, list)
+			if (!strcmp(opt->option->id, id))
+				return opt;
+	}
 
-	return handler;
+	return NULL;
 }
 
-void device_handler_destroy(struct device_handler *handler)
+void device_handler_boot(struct device_handler *handler,
+		struct boot_command *cmd)
 {
-	talloc_free(handler);
+	struct discover_boot_option *opt;
+
+	opt = find_boot_option_by_id(handler, cmd->option_id);
+
+	boot(handler, opt, cmd, handler->dry_run, boot_status, handler);
+}
+
+void device_handler_cancel_default(struct device_handler *handler)
+{
+	struct boot_status status;
+
+	if (handler->timeout_waiter)
+		waiter_remove(handler->timeout_waiter);
+
+	handler->timeout_waiter = NULL;
+	handler->default_enabled = false;
+
+	/* we only send status if we had a default boot option queued */
+	if (!handler->default_boot_option)
+		return;
+
+	pb_log("Cancelling default boot option\n");
+
+	handler->default_boot_option = NULL;
+
+	status.type = BOOT_STATUS_INFO;
+	status.progress = -1;
+	status.detail = NULL;
+	status.message = "Default boot cancelled";
+
+	discover_server_notify_boot_status(handler->server, &status);
 }
+#endif