X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fboot.c;h=e5803a76dcf0fbc228f2c426b19c415c28d382ef;hp=d0b57b5aac03505a306033845072740aa1f4c335;hb=416647ec10a0ca505de35348620391fde80043c0;hpb=7889b6f4bf81a1d2742c6f7d6fb9f6f603dd251e

diff --git a/discover/boot.c b/discover/boot.c
index d0b57b5..e5803a7 100644
--- a/discover/boot.c
+++ b/discover/boot.c
@@ -1,5 +1,7 @@
 
-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
 
 #include <stdbool.h>
 #include <stdlib.h>
@@ -15,6 +17,7 @@
 #include <system/system.h>
 #include <talloc/talloc.h>
 #include <url/url.h>
+#include <util/util.h>
 
 #include "device-handler.h"
 #include "boot.h"
@@ -27,29 +30,18 @@ enum {
 	BOOT_HOOK_EXIT_UPDATE	= 2,
 };
 
-enum boot_process_state {
-	BOOT_STATE_INITIAL,
-	BOOT_STATE_IMAGE_LOADING,
-	BOOT_STATE_INITRD_LOADING,
-	BOOT_STATE_DTB_LOADING,
-	BOOT_STATE_FINISH,
-	BOOT_STATE_UNKNOWN,
-};
-
-
 struct boot_task {
-	char *local_image;
-	char *local_initrd;
-	char *local_dtb;
-	char *args;
-	unsigned int clean_image;
-	unsigned int clean_initrd;
-	unsigned int clean_dtb;
-	struct pb_url *image, *initrd, *dtb;
+	struct load_url_result *image;
+	struct load_url_result *initrd;
+	struct load_url_result *dtb;
+	const char *local_image;
+	const char *local_initrd;
+	const char *local_dtb;
+	const char *args;
 	boot_status_fn status_fn;
 	void *status_arg;
-	enum boot_process_state state;
 	bool dry_run;
+	bool cancelled;
 };
 
 /**
@@ -150,6 +142,8 @@ static void __attribute__((format(__printf__, 4, 5))) update_status(
 	status.progress = -1;
 	status.detail = NULL;
 
+	pb_debug("boot status: [%d] %s\n", type, status.message);
+
 	fn(arg, &status);
 
 	talloc_free(status.message);
@@ -160,7 +154,7 @@ static void boot_hook_update_param(void *ctx, struct boot_task *task,
 {
 	struct p {
 		const char *name;
-		char **p;
+		const char **p;
 	} *param, params[] = {
 		{ "boot_image",		&task->local_image },
 		{ "boot_initrd",	&task->local_initrd },
@@ -277,11 +271,9 @@ static void run_boot_hooks(struct boot_task *task)
 			/* if the hook returned with BOOT_HOOK_EXIT_UPDATE,
 			 * then we process stdout to look for updated params
 			 */
-			if (rc == BOOT_HOOK_EXIT_UPDATE) {
-				boot_hook_update(task, hooks[i]->d_name,
-						process->stdout_buf);
-				boot_hook_setenv(task);
-			}
+			boot_hook_update(task, hooks[i]->d_name,
+					process->stdout_buf);
+			boot_hook_setenv(task);
 		}
 
 		process_release(process);
@@ -291,134 +283,150 @@ static void run_boot_hooks(struct boot_task *task)
 	free(hooks);
 }
 
-static void boot_process(void *ctx, int status)
+static bool load_pending(struct load_url_result *result)
 {
-	struct boot_task *task = ctx;
-	int result = -1;
+	return result && result->status == LOAD_ASYNC;
+}
 
-	if (task->state == BOOT_STATE_INITIAL) {
-		update_status(task->status_fn, task->status_arg,
-				BOOT_STATUS_INFO, "loading kernel");
-		task->local_image = load_url_async(task, task->image,
-					&task->clean_image, boot_process);
-		if (!task->local_image) {
-			update_status(task->status_fn, task->status_arg,
-					BOOT_STATUS_ERROR,
-					"Couldn't load kernel image");
-			goto no_load;
-		}
-		task->state = BOOT_STATE_IMAGE_LOADING;
+static int check_load(struct boot_task *task, const char *name,
+		struct load_url_result *result)
+{
+	if (!result)
+		return 0;
+	if (result->status != LOAD_ERROR)
+		return 0;
+
+	update_status(task->status_fn, task->status_arg,
+			BOOT_STATUS_ERROR,
+			"Couldn't load %s", name);
+	return -1;
+}
+
+static void cleanup_load(struct load_url_result *result)
+{
+	if (!result)
 		return;
-	}
+	if (result->status != LOAD_OK)
+		return;
+	if (!result->cleanup_local)
+		return;
+	unlink(result->local);
+}
 
-	if (task->state == BOOT_STATE_IMAGE_LOADING) {
-		if (status) {
-			update_status(task->status_fn, task->status_arg,
-					BOOT_STATUS_ERROR,
-					"Error loading kernel image");
-			goto no_load;
-		}
-		task->state = BOOT_STATE_INITRD_LOADING;
+static void cleanup_cancellations(struct boot_task *task,
+		struct load_url_result *cur_result)
+{
+	struct load_url_result *result, **results[] = {
+		&task->image, &task->initrd, &task->dtb,
+	};
+	bool pending = false;
+	unsigned int i;
 
-		if (task->initrd) {
-			update_status(task->status_fn, task->status_arg,
-					BOOT_STATUS_INFO, "loading initrd");
-			task->local_initrd = load_url_async(task, task->initrd,
-					&task->clean_initrd, boot_process);
-			if (!task->local_initrd) {
-				update_status(task->status_fn, task->status_arg,
-						BOOT_STATUS_ERROR,
-						"Couldn't load initrd image");
-				goto no_load;
-			}
-			return;
-		}
-	}
+	for (i = 0; i < ARRAY_SIZE(results); i++) {
+		result = *results[i];
 
-	if (task->state == BOOT_STATE_INITRD_LOADING) {
-		if (status) {
-			update_status(task->status_fn, task->status_arg,
-					BOOT_STATUS_ERROR,
-					"Error loading initrd");
-			goto no_load;
-		}
-		task->state = BOOT_STATE_DTB_LOADING;
+		if (!result)
+			continue;
 
-		if (task->dtb) {
-			update_status(task->status_fn, task->status_arg,
-					BOOT_STATUS_INFO,
-					"loading device tree");
-			task->local_dtb = load_url_async(task, task->dtb,
-						&task->clean_dtb, boot_process);
-			if (!task->local_dtb) {
-				update_status(task->status_fn, task->status_arg,
-						BOOT_STATUS_ERROR,
-						"Couldn't load device tree");
-				goto no_load;
-			}
-			return;
+		/* We need to cleanup and free any completed loads */
+		if (result == cur_result || result->status == LOAD_OK
+				|| result->status == LOAD_ERROR) {
+			cleanup_load(result);
+			talloc_free(result);
+			*results[i] = NULL;
+
+		/* ... and cancel any pending loads, which we'll free in
+		 * the completion callback */
+		} else if (result->status == LOAD_ASYNC) {
+			load_url_async_cancel(result);
+			pending = true;
 		}
 	}
 
-	if (task->state == BOOT_STATE_DTB_LOADING) {
-		if (status) {
-			update_status(task->status_fn, task->status_arg,
-					BOOT_STATUS_ERROR,
-					"Error loading dtb");
-			goto no_load;
-		}
-		task->state = BOOT_STATE_FINISH;
-	}
+	if (!pending)
+		talloc_free(task);
+}
 
+static void boot_process(struct load_url_result *result, void *data)
+{
+	struct boot_task *task = data;
+	int rc = -1;
 
-	if (task->state != BOOT_STATE_FINISH) {
-		task->state = BOOT_STATE_UNKNOWN;
+	if (task->cancelled) {
+		cleanup_cancellations(task, result);
 		return;
 	}
 
+	if (load_pending(task->image) ||
+			load_pending(task->initrd) ||
+			load_pending(task->dtb))
+		return;
+
+	if (check_load(task, "kernel image", task->image) ||
+			check_load(task, "initrd", task->initrd) ||
+			check_load(task, "dtb", task->dtb))
+		goto no_load;
+
+	/* we make a copy of the local paths, as the boot hooks might update
+	 * and/or create these */
+	task->local_image = task->image ? task->image->local : NULL;
+	task->local_initrd = task->initrd ? task->initrd->local : NULL;
+	task->local_dtb = task->dtb ? task->dtb->local : NULL;
+
 	run_boot_hooks(task);
 
 	update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
 			"performing kexec_load");
 
-	result = kexec_load(task);
-
-	if (result) {
+	rc = kexec_load(task);
+	if (rc) {
 		update_status(task->status_fn, task->status_arg,
 				BOOT_STATUS_ERROR, "kexec load failed");
 	}
 
 no_load:
-	if (task->clean_image)
-		unlink(task->local_image);
-	if (task->clean_initrd)
-		unlink(task->local_initrd);
-	if (task->clean_dtb)
-		unlink(task->local_dtb);
-
-	if (!result) {
+	cleanup_load(task->image);
+	cleanup_load(task->initrd);
+	cleanup_load(task->dtb);
+
+	if (!rc) {
 		update_status(task->status_fn, task->status_arg,
 				BOOT_STATUS_INFO,
 				"performing kexec reboot");
 
-		result = kexec_reboot(task);
-
-		if (result) {
+		rc = kexec_reboot(task);
+		if (rc) {
 			update_status(task->status_fn, task->status_arg,
 					BOOT_STATUS_ERROR,
 					"kexec reboot failed");
 		}
 	}
+}
 
-	talloc_free(task);
+static int start_url_load(struct boot_task *task, const char *name,
+		struct pb_url *url, struct load_url_result **result)
+{
+	if (!url)
+		return 0;
+
+	*result = load_url_async(task, url, boot_process, task);
+	if (!*result) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_ERROR,
+				"Error loading %s", name);
+		return -1;
+	}
+	return 0;
 }
 
-int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
-		int dry_run, boot_status_fn status_fn, void *status_arg)
+struct boot_task *boot(void *ctx, struct discover_boot_option *opt,
+		struct boot_command *cmd, int dry_run,
+		boot_status_fn status_fn, void *status_arg)
 {
+	struct pb_url *image = NULL, *initrd = NULL, *dtb = NULL;
 	struct boot_task *boot_task;
-	struct pb_url *image = NULL;
 	const char *boot_desc;
+	int rc;
 
 	if (opt && opt->option->name)
 		boot_desc = opt->option->name;
@@ -438,28 +446,26 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 		pb_log("%s: no image specified\n", __func__);
 		update_status(status_fn, status_arg, BOOT_STATUS_INFO,
 				"Boot failed: no image specified");
-		return -1;
+		return NULL;
 	}
 
-	boot_task = talloc_zero(ctx, struct boot_task);
-	boot_task->image = image;
-	boot_task->dry_run = dry_run;
-	boot_task->status_fn = status_fn;
-	boot_task->status_arg = status_arg;
-	boot_task->state = BOOT_STATE_INITIAL;
-
 	if (cmd && cmd->initrd_file) {
-		boot_task->initrd = pb_url_parse(opt, cmd->initrd_file);
+		initrd = pb_url_parse(opt, cmd->initrd_file);
 	} else if (opt && opt->initrd) {
-		boot_task->initrd = opt->initrd->url;
+		initrd = opt->initrd->url;
 	}
 
 	if (cmd && cmd->dtb_file) {
-		boot_task->dtb = pb_url_parse(opt, cmd->dtb_file);
+		dtb = pb_url_parse(opt, cmd->dtb_file);
 	} else if (opt && opt->dtb) {
-		boot_task->dtb = opt->dtb->url;
+		dtb = opt->dtb->url;
 	}
 
+	boot_task = talloc_zero(ctx, struct boot_task);
+	boot_task->dry_run = dry_run;
+	boot_task->status_fn = status_fn;
+	boot_task->status_arg = status_arg;
+
 	if (cmd && cmd->boot_args) {
 		boot_task->args = talloc_strdup(boot_task, cmd->boot_args);
 	} else if (opt && opt->option->boot_args) {
@@ -469,7 +475,28 @@ int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
 		boot_task->args = NULL;
 	}
 
-	boot_process(boot_task, 0);
+	/* start async loads for boot resources */
+	rc = start_url_load(boot_task, "kernel image", image, &boot_task->image)
+	  || start_url_load(boot_task, "initrd", initrd, &boot_task->initrd)
+	  || start_url_load(boot_task, "dtb", dtb, &boot_task->dtb);
 
-	return 0;
+	/* If all URLs are local, we may be done. */
+	if (rc) {
+		talloc_free(boot_task);
+		return NULL;
+	}
+
+	boot_process(NULL, boot_task);
+
+	return boot_task;
+}
+
+void boot_cancel(struct boot_task *task)
+{
+	task->cancelled = true;
+
+	update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
+			"Boot cancelled");
+
+	cleanup_cancellations(task, NULL);
 }