bootctl

BOOTCTL(1)                          bootctl                         BOOTCTL(1)

NAME
       bootctl - Control the firmware and boot manager settings

SYNOPSIS
       bootctl [OPTIONS...] {COMMAND}

DESCRIPTION
       bootctl can check the EFI boot loader status, list available boot
       loaders and boot loader entries, and install, update, or remove the
       systemd-boot(7) boot loader on the current system.

COMMANDS
       status
           Shows brief information about the system firmware, the boot loader
           that was used to boot the system, the boot loaders currently
           available in the ESP, the boot loaders listed in the firmware's
           list of boot loaders and the current default boot loader entry. If
           no command is specified, this is the implied default.

       install
           Installs systemd-boot into the EFI system partition. A copy of
           systemd-boot will be stored as the EFI default/fallback loader at
           ESP/EFI/BOOT/BOOT*.EFI. The boot loader is then added to the top of
           the firmware's boot loader list.

       update
           Updates all installed versions of systemd-boot(7), if the available
           version is newer than the version installed in the EFI system
           partition. This also includes the EFI default/fallback loader at
           ESP/EFI/BOOT/BOOT*.EFI. The boot loader is then added to end of the
           firmware's boot loader list if missing.

       remove
           Removes all installed versions of systemd-boot from the EFI system
           partition and the firmware's boot loader list.

       is-installed
           Checks whether systemd-boot is installed in the ESP. Note that a
           single ESP might host multiple boot loaders; this hence checks
           whether systemd-boot is one (of possibly many) installed boot
           loaders -- and neither whether it is the default nor whether it is
           registered in any EFI variables.

       random-seed
           Generates a random seed and stores it in the EFI System Partition,
           for use by the systemd-boot boot loader. Also, generates a random
           'system token' and stores it persistently as an EFI variable, if
           one has not been set before. If the boot loader finds the random
           seed in the ESP and the system token in the EFI variable it will
           derive a random seed to pass to the OS and a new seed to store in
           the ESP from the combination of both. The random seed passed to the
           OS is credited to the kernel's entropy pool by the system manager
           during early boot, and permits userspace to boot up with an entropy
           pool fully initialized very early on. Also see systemd-boot-system-
           token.service(8).

           See Random Seeds[1] for further information.

       systemd-efi-options [VALUE]
           When called without the optional argument, prints the current value
           of the "SystemdOptions" EFI variable. When called with an argument,
           sets the variable to that value. See systemd(1) for the meaning of
           that variable.

       list
           Shows all available boot loader entries implementing the Boot
           Loader Specification[2], as well as any other entries discovered or
           automatically generated by the boot loader.

       set-default ID, set-oneshot ID
           Sets the default boot loader entry. Takes a single boot loader
           entry ID string as argument. The set-oneshot command will set the
           default entry only for the next boot, the set-default will set it
           persistently for all future boots.

OPTIONS
       The following options are understood:

       --esp-path=
           Path to the EFI System Partition (ESP). If not specified, /efi/,
           /boot/, and /boot/efi/ are checked in turn. It is recommended to
           mount the ESP to /efi/, if possible.

       --boot-path=
           Path to the Extended Boot Loader partition, as defined in the Boot
           Loader Specification[2]. If not specified, /boot/ is checked. It is
           recommended to mount the Extended Boot Loader partition to /boot/,
           if possible.

       -p, --print-esp-path
           This option modifies the behaviour of status. Only prints the path
           to the EFI System Partition (ESP) to standard output and exits.

       -x, --print-boot-path
           This option modifies the behaviour of status. Only prints the path
           to the Extended Boot Loader partition if it exists, and the path to
           the ESP otherwise to standard output and exit. This command is
           useful to determine where to place boot loader entries, as they are
           preferably placed in the Extended Boot Loader partition if it
           exists and in the ESP otherwise.

           Boot Loader Specification Type #1 entries should generally be
           placed in the directory "$(bootctl -x)/loader/entries/". Existence
           of that directory may also be used as indication that boot loader
           entry support is available on the system. Similarly, Boot Loader
           Specification Type #2 entries should be placed in the directory
           "$(bootctl -x)/EFI/Linux/".

           Note that this option (similar to the --print-booth-path option
           mentioned above), is available independently from the boot loader
           used, i.e. also without systemd-boot being installed.

       --no-variables
           Do not touch the firmware's boot loader list stored in EFI
           variables.

       --graceful
           Ignore failure when the EFI System Partition cannot be found, or
           when EFI variables cannot be written. Currently only applies to
           random seed operations.

       --no-pager
           Do not pipe output into a pager.

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

       --version
           Print a short version string and exit.

EXIT STATUS
       On success, 0 is returned, a non-zero failure code otherwise.

ENVIRONMENT
       If $SYSTEMD_RELAX_ESP_CHECKS=1 is set the validation checks for the ESP
       are relaxed, and the path specified with --esp-path= may refer to any
       kind of file system on any kind of partition.

       Similarly, $SYSTEMD_RELAX_XBOOTLDR_CHECKS=1 turns off some validation
       checks for the Extended Boot Loader partition.

SEE ALSO
       systemd-boot(7), Boot Loader Specification[2], Boot Loader
       Interface[3], systemd-boot-system-token.service(8)

NOTES
        1. Random Seeds
           https://systemd.io/RANDOM_SEEDS

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

        3. Boot Loader Interface
           https://systemd.io/BOOT_LOADER_INTERFACE

systemd 245                                                         BOOTCTL(1)