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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <getopt.h>
#include <sys/stat.h>
#include "build.h"
#include "devnum-util.h"
#include "hibernate-resume-config.h"
#include "hibernate-util.h"
#include "initrd-util.h"
#include "log.h"
#include "main-func.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "static-destruct.h"
#include "terminal-util.h"
static HibernateInfo arg_info = {};
static bool arg_clear = false;
STATIC_DESTRUCTOR_REGISTER(arg_info, hibernate_info_done);
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-hibernate-resume", "8", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] [DEVICE [OFFSET]]\n"
"\n%sInitiate resume from hibernation.%s\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --clear Clear hibernation storage information from EFI and exit\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_CLEAR,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "clear", no_argument, NULL, ARG_CLEAR },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_CLEAR:
arg_clear = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (argc > optind && arg_clear)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Extraneous arguments specified with --clear, refusing.");
return 1;
}
static int setup_hibernate_info_and_warn(void) {
int r;
r = acquire_hibernate_info(&arg_info);
if (r == -ENODEV) {
log_info_errno(r, "No resume device found, exiting.");
return 0;
}
if (r < 0)
return r;
compare_hibernate_location_and_warn(&arg_info);
return 1;
}
static int action_clear(void) {
int r;
assert(arg_clear);
/* Let's insist that the system identifier is verified still. After all if things don't match,
* the resume wouldn't get triggered in the first place. We should not erase the var if booted
* from LiveCD/portable systems/... */
r = get_efi_hibernate_location(/* ret = */ NULL);
if (r <= 0)
return r;
r = clear_efi_hibernate_location_and_warn();
if (r > 0)
log_notice("Successfully cleared HibernateLocation EFI variable.");
return r;
}
static int run(int argc, char *argv[]) {
struct stat st;
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
if (argc - optind > 2)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program expects zero, one, or two arguments.");
umask(0022);
if (arg_clear)
return action_clear();
if (!in_initrd())
return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE),
"Not running in initrd, refusing to initiate resume from hibernation.");
if (argc <= optind) {
r = setup_hibernate_info_and_warn();
if (r <= 0)
return r;
if (arg_info.efi)
(void) clear_efi_hibernate_location_and_warn();
} else {
arg_info.device = ASSERT_PTR(argv[optind]);
if (argc - optind == 2) {
r = safe_atou64(argv[optind + 1], &arg_info.offset);
if (r < 0)
return log_error_errno(r, "Failed to parse resume offset %s: %m", argv[optind + 1]);
}
}
if (stat(arg_info.device, &st) < 0)
return log_error_errno(errno, "Failed to stat resume device '%s': %m", arg_info.device);
if (!S_ISBLK(st.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK),
"Resume device '%s' is not a block device.", arg_info.device);
/* The write shall not return if a resume takes place. */
r = write_resume_config(st.st_rdev, arg_info.offset, arg_info.device);
log_full_errno(r < 0 ? LOG_ERR : LOG_DEBUG,
r < 0 ? r : SYNTHETIC_ERRNO(ENOENT),
"Unable to resume from device '%s' (" DEVNUM_FORMAT_STR ") offset %" PRIu64 ", continuing boot process.",
arg_info.device, DEVNUM_FORMAT_VAL(st.st_rdev), arg_info.offset);
return r;
}
DEFINE_MAIN_FUNCTION(run);
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