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#include <assert.h>
#include <log/log.h>
#include <pb-protocol/pb-protocol.h>
#include <system/system.h>
#include <talloc/talloc.h>
#include <url/url.h>
#include "device-handler.h"
#include "boot.h"
#include "paths.h"
#include "resource.h"
/**
* kexec_load - kexec load helper.
* @l_image: The local image file for kexec to execute.
* @l_initrd: Optional local initrd file for kexec --initrd, can be NULL.
* @args: Optional command line args for kexec --append, can be NULL.
*/
static int kexec_load(const char *l_image, const char *l_initrd,
const char *args, int dry_run)
{
int result;
const char *argv[6];
const char **p;
char *s_initrd = NULL;
char *s_args = NULL;
p = argv;
*p++ = pb_system_apps.kexec; /* 1 */
*p++ = "-l"; /* 2 */
if (l_initrd) {
s_initrd = talloc_asprintf(NULL, "--initrd=%s", l_initrd);
assert(s_initrd);
*p++ = s_initrd; /* 3 */
}
if (args) {
s_args = talloc_asprintf(NULL, "--append=%s", args);
assert(s_args);
*p++ = s_args; /* 4 */
}
*p++ = l_image; /* 5 */
*p++ = NULL; /* 6 */
result = pb_run_cmd(argv, 1, dry_run);
if (result)
pb_log("%s: failed: (%d)\n", __func__, result);
talloc_free(s_initrd);
talloc_free(s_args);
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(int dry_run)
{
int result = 0;
const char *argv[4];
const char **p;
/* First try running shutdown. Init scripts should run 'exec -e' */
p = argv;
*p++ = pb_system_apps.shutdown; /* 1 */
*p++ = "-r"; /* 2 */
*p++ = "now"; /* 3 */
*p++ = NULL; /* 4 */
result = pb_run_cmd(argv, 1, dry_run);
/* On error, force a kexec with the -e option */
if (result) {
p = argv;
*p++ = pb_system_apps.kexec; /* 1 */
*p++ = "-e"; /* 2 */
*p++ = NULL; /* 3 */
result = pb_run_cmd(argv, 1, 0);
}
if (result)
pb_log("%s: failed: (%d)\n", __func__, result);
return result;
}
static void update_status(boot_status_fn fn, void *arg, int type,
char *message)
{
struct boot_status status;
status.type = type;
status.message = message;
status.progress = -1;
status.detail = NULL;
fn(arg, &status);
}
int boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd,
int dry_run, boot_status_fn status_fn, void *status_arg)
{
char *local_image, *local_initrd;
unsigned int clean_image = 0;
unsigned int clean_initrd = 0;
struct pb_url *image, *initrd;
char *args;
int result;
local_initrd = NULL;
image = NULL;
initrd = NULL;
args = NULL;
if (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", __func__);
return -1;
}
if (cmd->initrd_file) {
initrd = pb_url_parse(opt, cmd->initrd_file);
} else if (opt && opt->initrd) {
initrd = opt->initrd->url;
}
if (cmd->boot_args) {
args = talloc_strdup(ctx, cmd->boot_args);
} else if (opt && opt->option->boot_args) {
args = talloc_strdup(ctx, opt->option->boot_args);
}
result = -1;
update_status(status_fn, status_arg, BOOT_STATUS_INFO,
"loading kernel");
local_image = load_url(NULL, image, &clean_image);
if (!local_image) {
update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
"Couldn't load kernel image");
goto no_load;
}
if (initrd) {
update_status(status_fn, status_arg, BOOT_STATUS_INFO,
"loading initrd");
local_initrd = load_url(NULL, initrd, &clean_initrd);
if (!local_initrd) {
update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
"Couldn't load initrd image");
goto no_load;
}
}
update_status(status_fn, status_arg, BOOT_STATUS_INFO,
"performing kexec_load");
result = kexec_load(local_image, local_initrd, args, dry_run);
if (result) {
update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
"kexec load failed");
}
no_load:
if (clean_image)
unlink(local_image);
if (clean_initrd)
unlink(local_initrd);
talloc_free(local_image);
talloc_free(local_initrd);
if (!result) {
update_status(status_fn, status_arg, BOOT_STATUS_INFO,
"performing kexec reboot");
result = kexec_reboot(dry_run);
if (result) {
update_status(status_fn, status_arg, BOOT_STATUS_ERROR,
"kexec reboot failed");
}
}
return result;
}
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