summaryrefslogtreecommitdiffstats
path: root/discover/boot.c
blob: e5803a76dcf0fbc228f2c426b19c415c28d382ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502

#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif

#include <stdbool.h>
#include <stdlib.h>
#include <assert.h>
#include <dirent.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>

#include <log/log.h>
#include <pb-protocol/pb-protocol.h>
#include <process/process.h>
#include <system/system.h>
#include <talloc/talloc.h>
#include <url/url.h>
#include <util/util.h>

#include "device-handler.h"
#include "boot.h"
#include "paths.h"
#include "resource.h"

static const char *boot_hook_dir = PKG_SYSCONF_DIR "/boot.d";
enum {
	BOOT_HOOK_EXIT_OK	= 0,
	BOOT_HOOK_EXIT_UPDATE	= 2,
};

struct boot_task {
	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;
	bool dry_run;
	bool cancelled;
};

/**
 * kexec_load - kexec load helper.
 */
static int kexec_load(struct boot_task *boot_task)
{
	int result;
	const char *argv[7];
	const char **p;
	char *s_initrd = NULL;
	char *s_dtb = NULL;
	char *s_args = NULL;

	p = argv;
	*p++ = pb_system_apps.kexec;	/* 1 */
	*p++ = "-l";			/* 2 */

	if (boot_task->local_initrd) {
		s_initrd = talloc_asprintf(boot_task, "--initrd=%s",
				boot_task->local_initrd);
		assert(s_initrd);
		*p++ = s_initrd;	 /* 3 */
	}

	if (boot_task->local_dtb) {
		s_dtb = talloc_asprintf(boot_task, "--dtb=%s",
						boot_task->local_dtb);
		assert(s_dtb);
		*p++ = s_dtb;		 /* 4 */
	}

	if (boot_task->args) {
		s_args = talloc_asprintf(boot_task, "--append=%s",
						boot_task->args);
		assert(s_args);
		*p++ = s_args;		/* 5 */
	}

	*p++ = boot_task->local_image;	/* 6 */
	*p++ = NULL;			/* 7 */

	result = process_run_simple_argv(boot_task, argv);

	if (result)
		pb_log("%s: failed: (%d)\n", __func__, result);

	return result;
}

/**
 * kexec_reboot - Helper to boot the new kernel.
 *
 * Must only be called after a successful call to kexec_load().
 */

static int kexec_reboot(struct boot_task *task)
{
	int result;

	/* First try running shutdown.  Init scripts should run 'exec -e' */
	result = process_run_simple(task, pb_system_apps.shutdown, "-r",
			"now", NULL);

	/* On error, force a kexec with the -e option */
	if (result) {
		result = process_run_simple(task, pb_system_apps.kexec,
						"-e", NULL);
	}

	if (result)
		pb_log("%s: failed: (%d)\n", __func__, result);

	/* okay, kexec -e -f */
	if (result) {
		result = process_run_simple(task, pb_system_apps.kexec,
						"-e", "-f", NULL);
	}

	if (result)
		pb_log("%s: failed: (%d)\n", __func__, result);


	return result;
}

static void __attribute__((format(__printf__, 4, 5))) update_status(
		boot_status_fn fn, void *arg, int type, char *fmt, ...)
{
	struct boot_status status;
	va_list ap;

	va_start(ap, fmt);
	status.message = talloc_vasprintf(NULL, fmt, ap);
	va_end(ap);

	status.type = type;
	status.progress = -1;
	status.detail = NULL;

	pb_debug("boot status: [%d] %s\n", type, status.message);

	fn(arg, &status);

	talloc_free(status.message);
}

static void boot_hook_update_param(void *ctx, struct boot_task *task,
		const char *name, const char *value)
{
	struct p {
		const char *name;
		const char **p;
	} *param, params[] = {
		{ "boot_image",		&task->local_image },
		{ "boot_initrd",	&task->local_initrd },
		{ "boot_dtb",		&task->local_dtb },
		{ "boot_args",		&task->args },
		{ NULL, NULL },
	};

	for (param = params; param->name; param++) {
		if (strcmp(param->name, name))
			continue;

		*param->p = talloc_strdup(ctx, value);
		return;
	}
}

static void boot_hook_update(struct boot_task *task, const char *hookname,
		char *buf)
{
	char *line, *name, *val, *sep;
	char *saveptr;

	for (;; buf = NULL) {

		line = strtok_r(buf, "\n", &saveptr);
		if (!line)
			break;

		sep = strchr(line, '=');
		if (!sep)
			continue;

		*sep = '\0';
		name = line;
		val = sep + 1;

		boot_hook_update_param(task, task, name, val);

		pb_log("boot hook %s specified %s=%s\n",
				hookname, name, val);
	}
}

static void boot_hook_setenv(struct boot_task *task)
{
	unsetenv("boot_image");
	unsetenv("boot_initrd");
	unsetenv("boot_dtb");
	unsetenv("boot_args");

	setenv("boot_image", task->local_image, 1);
	if (task->local_initrd)
		setenv("boot_initrd", task->local_initrd, 1);
	if (task->local_dtb)
		setenv("boot_dtb", task->local_dtb, 1);
	if (task->args)
		setenv("boot_args", task->args, 1);
}

static int hook_filter(const struct dirent *dirent)
{
	return dirent->d_type == DT_REG || dirent->d_type == DT_LNK;
}

static int hook_cmp(const struct dirent **a, const struct dirent **b)
{
	return strcmp((*a)->d_name, (*b)->d_name);
}

static void run_boot_hooks(struct boot_task *task)
{
	struct dirent **hooks;
	int i, n;

	n = scandir(boot_hook_dir, &hooks, hook_filter, hook_cmp);
	if (n < 1)
		return;

	update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
			"running boot hooks");

	boot_hook_setenv(task);

	for (i = 0; i < n; i++) {
		const char *argv[2] = { NULL, NULL };
		struct process *process;
		char *path;
		int rc;

		path = join_paths(task, boot_hook_dir, hooks[i]->d_name);

		if (access(path, X_OK)) {
			talloc_free(path);
			continue;
		}

		process = process_create(task);

		argv[0] = path;
		process->path = path;
		process->argv = argv;
		process->keep_stdout = true;

		pb_log("running boot hook %s\n", hooks[i]->d_name);

		rc = process_run_sync(process);
		if (rc) {
			pb_log("boot hook exec failed!\n");

		} else if (WIFEXITED(process->exit_status) &&
			   WEXITSTATUS(process->exit_status)
				== BOOT_HOOK_EXIT_UPDATE) {
			/* if the hook returned with BOOT_HOOK_EXIT_UPDATE,
			 * then we process stdout to look for updated params
			 */
			boot_hook_update(task, hooks[i]->d_name,
					process->stdout_buf);
			boot_hook_setenv(task);
		}

		process_release(process);
		talloc_free(path);
	}

	free(hooks);
}

static bool load_pending(struct load_url_result *result)
{
	return result && result->status == LOAD_ASYNC;
}

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);
}

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;

	for (i = 0; i < ARRAY_SIZE(results); i++) {
		result = *results[i];

		if (!result)
			continue;

		/* 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 (!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->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");

	rc = kexec_load(task);
	if (rc) {
		update_status(task->status_fn, task->status_arg,
				BOOT_STATUS_ERROR, "kexec load failed");
	}

no_load:
	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");

		rc = kexec_reboot(task);
		if (rc) {
			update_status(task->status_fn, task->status_arg,
					BOOT_STATUS_ERROR,
					"kexec reboot failed");
		}
	}
}

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;
}

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;
	const char *boot_desc;
	int rc;

	if (opt && opt->option->name)
		boot_desc = opt->option->name;
	else if (cmd && cmd->boot_image_file)
		boot_desc = cmd->boot_image_file;
	else
		boot_desc = "(unknown)";

	update_status(status_fn, status_arg, BOOT_STATUS_INFO,
			"Booting %s.", boot_desc);

	if (cmd && cmd->boot_image_file) {
		image = pb_url_parse(opt, cmd->boot_image_file);
	} else if (opt && opt->boot_image) {
		image = opt->boot_image->url;
	} else {
		pb_log("%s: no image specified\n", __func__);
		update_status(status_fn, status_arg, BOOT_STATUS_INFO,
				"Boot failed: no image specified");
		return NULL;
	}

	if (cmd && cmd->initrd_file) {
		initrd = pb_url_parse(opt, cmd->initrd_file);
	} else if (opt && opt->initrd) {
		initrd = opt->initrd->url;
	}

	if (cmd && cmd->dtb_file) {
		dtb = pb_url_parse(opt, cmd->dtb_file);
	} else if (opt && opt->dtb) {
		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) {
		boot_task->args = talloc_strdup(boot_task,
						opt->option->boot_args);
	} else {
		boot_task->args = NULL;
	}

	/* 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);

	/* 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);
}
OpenPOWER on IntegriCloud