|
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | NOTES | COLOPHON |
SYSTEMD-BLESS-BOOT.SERVICE(8)emd-bless-boot.serviceEMD-BLESS-BOOT.SERVICE(8)
systemd-bless-boot.service, systemd-bless-boot - Mark current boot
process as successful
systemd-bless-boot.service
/usr/lib/systemd/system-bless-boot
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:
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.
systemd(1), systemd-boot(7), systemd.special(7)
1. Boot Loader Specification
https://systemd.io/BOOT_LOADER_SPECIFICATION
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 2020-08-13. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-08-11.) 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 246 SYSTEMD-BLESS-BOOT.SERVICE(8)
Pages that refer to this page: 30-systemd-environment-d-generator(7) , sd-boot(7) , systemd-boot(7) , systemd.directives(7) , systemd.index(7) , systemd.special(7) , systemd-bless-boot-generator(8)