systemd-bless-boot.service(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | NOTES | COLOPHON

SYSTEMD-BLESS-BOOT.SERVICE(8)d-bless-boot.serviceD-BLESS-BOOT.SERVICE(8)

NAME         top

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

SYNOPSIS         top

       systemd-bless-boot.service

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

DESCRIPTION         top

       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         top

       The /usr/lib/systemd/system-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.

       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.

       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.

       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.

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

       --version
           Print a short version string and exit.

SEE ALSO         top

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

NOTES         top

        1. Boot Loader Specification
           https://systemd.io/BOOT_LOADER_SPECIFICATION

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2021-04-01.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-04-01.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 248                                SYSTEMD-BLESS-BOOT.SERVICE(8)

Pages that refer to this page: systemd-boot(7)systemd.directives(7)systemd.index(7)systemd.special(7)systemd-bless-boot-generator(8)