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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <sys/stat.h>
#include <unistd.h>
#include "efivars.h"
#include "generator.h"
#include "log.h"
#include "mkdir.h"
#include "special.h"
#include "string-util.h"
#include "util.h"
#include "virt.h"
/* This generator pulls systemd-bless-boot.service into the initial transaction if the "LoaderBootCountPath" EFI
* variable is set, i.e. the system boots up with boot counting in effect, which means we should mark the boot as
* "good" if we manage to boot up far enough. */
static const char *arg_dest = "/tmp";
int main(int argc, char *argv[]) {
const char *p;
log_setup_generator();
if (argc > 1 && argc != 4) {
log_error("This program takes three or no arguments.");
return EXIT_FAILURE;
}
if (argc > 1)
arg_dest = argv[2];
if (in_initrd() > 0) {
log_debug("Skipping generator, running in the initrd.");
return EXIT_SUCCESS;
}
if (detect_container() > 0) {
log_debug("Skipping generator, running in a container.");
return EXIT_SUCCESS;
}
if (!is_efi_boot()) {
log_debug("Skipping generator, not an EFI boot.");
return EXIT_SUCCESS;
}
if (access("/sys/firmware/efi/efivars/LoaderBootCountPath-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f", F_OK) < 0) {
if (errno == ENOENT) {
log_debug_errno(errno, "Skipping generator, not booted with boot counting in effect.");
return EXIT_SUCCESS;
}
log_error_errno(errno, "Failed to check if LoaderBootCountPath EFI variable exists: %m");
return EXIT_FAILURE;
}
/* We pull this in from basic.target so that it ends up in all "regular" boot ups, but not in rescue.target or
* even emergency.target. */
p = strjoina(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/systemd-bless-boot.service");
(void) mkdir_parents(p, 0755);
if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-bless-boot.service", p) < 0) {
log_error_errno(errno, "Failed to create symlink '%s': %m", p);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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