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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "alloc-util.h"
#include "fstab-util.h"
#include "generator.h"
#include "log.h"
#include "main-func.h"
#include "mkdir.h"
#include "proc-cmdline.h"
#include "special.h"
#include "string-util.h"
#include "unit-name.h"
static const char *arg_dest = "/tmp";
static char *arg_resume_device = NULL;
static bool arg_noresume = false;
STATIC_DESTRUCTOR_REGISTER(arg_resume_device, freep);
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
if (streq(key, "resume")) {
char *s;
if (proc_cmdline_value_missing(key, value))
return 0;
s = fstab_node_to_udev_node(value);
if (!s)
return log_oom();
free_and_replace(arg_resume_device, s);
} else if (streq(key, "noresume")) {
if (value) {
log_warning("\"noresume\" kernel command line switch specified with an argument, ignoring.");
return 0;
}
arg_noresume = true;
}
return 0;
}
static int process_resume(void) {
_cleanup_free_ char *name = NULL, *lnk = NULL;
int r;
if (!arg_resume_device)
return 0;
r = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_device, ".service", &name);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
lnk = strjoin(arg_dest, "/" SPECIAL_SYSINIT_TARGET ".wants/", name);
if (!lnk)
return log_oom();
mkdir_parents_label(lnk, 0755);
if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-hibernate-resume@.service", lnk) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
return 0;
}
static int run(int argc, char *argv[]) {
int r = 0;
log_setup_generator();
if (argc > 1 && argc != 4)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program takes three or no arguments.");
if (argc > 1)
arg_dest = argv[1];
/* Don't even consider resuming outside of initramfs. */
if (!in_initrd()) {
log_debug("Not running in an initrd, quitting.");
return 0;
}
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
if (arg_noresume) {
log_notice("Found \"noresume\" on the kernel command line, quitting.");
return 0;
}
return process_resume();
}
DEFINE_MAIN_FUNCTION(run);
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