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



       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.)

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

           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.

           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.

           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.

           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.

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

           Print a short version string and exit.

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

        1. Boot Loader Specification

systemd 246                                        SYSTEMD-BLESS-BOOT.SERVICE(8)