X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fdevice-handler.c;h=950e730b995b89af52073b0ba8eaf0906d4147a9;hp=0e902df6b86ed4c1805868617cf7db85abb08bf7;hb=5be946c;hpb=94af239b00f547fb5daef88b16fecdfb0146691b

diff --git a/discover/device-handler.c b/discover/device-handler.c
index 0e902df..950e730 100644
--- a/discover/device-handler.c
+++ b/discover/device-handler.c
@@ -1,62 +1,531 @@
 
+#include <assert.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
 #include <talloc/talloc.h>
-#include <pb-protocol/pb-protocol.h>
+#include <list/list.h>
+#include <log/log.h>
+#include <types/types.h>
+#include <system/system.h>
 
 #include "device-handler.h"
+#include "discover-server.h"
+#include "event.h"
+#include "parser.h"
+#include "udev.h"
+#include "paths.h"
+#include "boot.h"
 
 struct device_handler {
-	struct discover_server *server;
+	struct discover_server	*server;
+	int			dry_run;
+
+	struct discover_device	**devices;
+	unsigned int		n_devices;
+};
+
+/**
+ * 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;
+
+	/* 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);
+	}
+
+
+	/* move boot options from the context to the device */
+	list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
+		list_remove(&opt->list);
+		list_add(&dev->boot_options, &opt->list);
+		talloc_steal(dev, opt);
+		discover_server_notify_boot_option_add(handler->server,
+							opt->option);
+	}
+}
+
+void discover_context_add_boot_option(struct discover_context *ctx,
+		struct discover_boot_option *boot_option)
+{
+	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);
 
-	struct device *devices;
-	int n_devices;
+	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);
+
+	/* 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;
+}
+
+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,
+	}
 };
 
-struct device_handler *device_handler_init(struct discover_server *server)
+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)
 {
 	struct device_handler *handler;
 
 	handler = talloc(NULL, struct device_handler);
 	handler->devices = NULL;
 	handler->n_devices = 0;
+	handler->server = server;
+	handler->dry_run = dry_run;
+
+	/* set up our mount point base */
+	pb_mkdir_recursive(mount_base());
+
+	parser_init();
 
 	return handler;
 }
 
-void device_handler_destroy(struct device_handler *devices)
+void device_handler_destroy(struct device_handler *handler)
 {
-	talloc_free(devices);
+	talloc_free(handler);
 }
 
-static struct boot_option options[] = {
-	{
-		.id = "1.1",
-		.name = "meep one",
-		.description = "meep description one",
-		.icon_file = "meep.one.png",
-		.boot_args = "root=/dev/sda1",
-	},
-};
+static int device_match_path(struct discover_device *dev, const char *path)
+{
+	return !strcmp(dev->device_path, path);
+}
 
-static struct device device = {
-	.id = "1",
-	.name = "meep",
-	.description = "meep description",
-	.icon_file = "meep.png",
-	.n_options = 1,
-	.options = options,
-};
+static int device_match_uuid(struct discover_device *dev, const char *uuid)
+{
+	return dev->uuid && !strcmp(dev->uuid, uuid);
+}
 
-int device_handler_get_current_devices(struct device_handler *handler,
-		struct device **devices)
+static int device_match_label(struct discover_device *dev, const char *label)
+{
+	return dev->label && !strcmp(dev->label, label);
+}
 
+static int device_match_id(struct discover_device *dev, const char *id)
 {
-	*devices = &device;
-	return 1;
+	return !strcmp(dev->device->id, id);
 }
 
+static struct discover_device *device_lookup(
+		struct device_handler *device_handler,
+		int (match_fn)(struct discover_device *, const char *),
+		const char *str)
+{
+	struct discover_device *dev;
+	unsigned int i;
 
-int device_handler_event(struct device_handler *handler,
-		struct udev_event *event)
+	if (!str)
+		return NULL;
+
+	for (i = 0; i < device_handler->n_devices; i++) {
+		dev = device_handler->devices[i];
+
+		if (match_fn(dev, str))
+			return dev;
+	}
+
+	return NULL;
+}
+
+struct discover_device *device_lookup_by_name(struct device_handler *handler,
+		const char *name)
 {
-	return 0;
+	struct discover_device *dev;
+	char *path;
+
+	if (strncmp(name, "/dev/", strlen("/dev/")))
+		path = talloc_asprintf(NULL, "/dev/%s", name);
+	else
+		path = talloc_strdup(NULL, name);
+
+	dev = device_lookup_by_path(handler, path);
+
+	talloc_free(path);
+
+	return dev;
+}
+
+struct discover_device *device_lookup_by_path(
+		struct device_handler *device_handler,
+		const char *path)
+{
+	return device_lookup(device_handler, device_match_path, path);
+}
+
+struct discover_device *device_lookup_by_uuid(
+		struct device_handler *device_handler,
+		const char *uuid)
+{
+	return device_lookup(device_handler, device_match_uuid, uuid);
+}
+
+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);
+}
+
+static struct discover_boot_option *find_boot_option_by_id(
+		struct device_handler *handler, const char *id)
+{
+	unsigned int i;
+
+	for (i = 0; i < handler->n_devices; i++) {
+		struct discover_device *dev = handler->devices[i];
+		struct discover_boot_option *opt;
+
+		list_for_each_entry(&dev->boot_options, opt, list)
+			if (!strcmp(opt->option->id, id))
+				return opt;
+	}
+
+	return NULL;
+}
+
+void device_handler_boot(struct device_handler *handler,
+		struct boot_command *cmd)
+{
+	struct discover_boot_option *opt;
+
+	opt = find_boot_option_by_id(handler, cmd->option_id);
+
+	boot(handler, opt, cmd, handler->dry_run);
 }