SYSTEMD-BLESS-BOOT.SERVICEsystemd-bless-boot.servSYSTEMD-BLESS-BOOT.SERVICE(8)
NAME
systemd-bless-boot.service, systemd-bless-boot - Mark current boot
process as successful
SYNOPSIS
systemd-bless-boot.service
/lib/systemd/system-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 /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
systemd(1), systemd-boot(7), systemd.special(1)
NOTES
1. Boot Loader Specification
https://systemd.io/BOOT_LOADER_SPECIFICATION
systemd 245 SYSTEMD-BLESS-BOOT.SERVICE(8)