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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <unistd.h>
#include "efi-loader.h"
#include "generator.h"
#include "initrd-util.h"
#include "log.h"
#include "mkdir.h"
#include "special.h"
#include "string-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 int run(const char *dest, const char *dest_early, const char *dest_late) {
if (in_initrd()) {
log_debug("Skipping generator, running in the initrd.");
return EXIT_SUCCESS;
}
if (detect_container() > 0) {
log_debug("Skipping generator, running in a container.");
return 0;
}
if (!is_efi_boot()) {
log_debug("Skipping generator, not an EFI boot.");
return 0;
}
if (access(EFIVAR_PATH(EFI_LOADER_VARIABLE(LoaderBootCountPath)), F_OK) < 0) {
if (errno == ENOENT) {
log_debug_errno(errno, "Skipping generator, not booted with boot counting in effect.");
return 0;
}
return log_error_errno(errno, "Failed to check if LoaderBootCountPath EFI variable exists: %m");
}
/* 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. */
const char *p = strjoina(dest_early, "/" SPECIAL_BASIC_TARGET ".wants/systemd-bless-boot.service");
(void) mkdir_parents(p, 0755);
if (symlink(SYSTEM_DATA_UNIT_DIR "/systemd-bless-boot.service", p) < 0)
return log_error_errno(errno, "Failed to create symlink '%s': %m", p);
return 0;
}
DEFINE_MAIN_GENERATOR_FUNCTION(run);
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