NAME
systemd-bless-boot.service, systemd-bless-boot - Mark current boot process as successfulSYNOPSIS
systemd-bless-boot.service /lib/systemd/systemd-bless-bootDESCRIPTION
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-b6c7-440b29bb8c4f), 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/systemd-bless-boot executable may also be invoked from the command line, taking one of the following command arguments: statusThe 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(7)NOTES
- 1.
- Boot Loader Specification
systemd 252 |