NAME

       systemd-bless-boot.service, systemd-bless-boot - Mark current boot process as successful

SYNOPSIS

       systemd-bless-boot.service

       /usr/lib/systemd/systemd-bless-boot

DESCRIPTION

       systemd-bless-boot.service is a system service that marks the current boot process as
       successful. It's automatically pulled into the initial transaction when systemd-bless-
       boot-generator(8) detects that systemd-boot(7) style boot counting is used.

       Internally, the service operates based on the LoaderBootCountPath EFI variable (of the
       vendor UUID 4a67b082-0a4c-41cf-b6c7-440b29bb8c4), which is passed from the boot loader to
       the OS. It contains a file system path (relative to the EFI system partition) of the Boot
       Loader Specification[1] compliant boot loader entry file or unified kernel image file that
       was used to boot up the system.  systemd-bless-boot.service removes the two 'tries done'
       and 'tries left' numeric boot counters from the filename, which indicates to future
       invocations of the boot loader that the entry has completed booting successfully at least
       once. (This service will hence rename the boot loader entry file or unified kernel image
       file on the first successful boot.)

OPTIONS

       The /usr/lib/systemd/systemd-bless-boot executable may also be invoked from the command
       line, taking one of the following command arguments:

       status
           The current status of the boot loader entry file or unified kernel image file is
           shown. This outputs one of "good", "bad", "indeterminate", "clean", depending on the
           state and previous invocations of the command. The string "indeterminate" is shown
           initially after boot, before it has been marked as "good" or "bad". The string "good"
           is shown after the boot was marked as "good" with the good command below, and "bad"
           conversely after the bad command was invoked. The string "clean" is returned when boot
           counting is currently not in effect.

           This command is implied if no command argument is specified.

           Added in version 240.

       good
           When invoked, the current boot loader entry file or unified kernel image file will be
           marked as "good", executing the file rename operation described above. This command is
           intended to be invoked at the end of a successful boot. The systemd-bless-boot.service
           unit invokes this command.

           Added in version 240.

       bad
           When called the 'tries left' counter in the boot loader entry file name or unified
           kernel image file name is set to zero, marking the boot loader entry or kernel image
           as "bad", so that the boot loader won't consider it anymore on future boots (at least
           as long as there are other entries available that are not marked "bad" yet). This
           command is normally not executed, but can be used to instantly put an end to the boot
           counting logic if a problem is detected and persistently mark the boot entry as bad.

           Added in version 240.

       indeterminate
           This command undoes any marking of the current boot loader entry file or unified
           kernel image file as good or bad. This is implemented by renaming the boot loader
           entry file or unified kernel image file back to the path encoded in the
           LoaderBootCountPath EFI variable.

           Added in version 240.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

SEE ALSO

       systemd(1), systemd-boot(7), systemd.special(7)

NOTES

        1. Boot Loader Specification
           https://uapi-group.org/specifications/specs/boot_loader_specification