Script to create EFI blob with initrd and kernel
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E759BAA22501AF32
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#!/bin/sh
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# EFI related vars
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EFI_BASE_LABEL="Debian unified"
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EFI_MOUNT_PATH="/boot/efi"
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temp_efi_list_file="/tmp/efibootmgr.label.entry.temp"
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# OS related vars
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ROOT_UUID=$(findmnt -kno UUID /)
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ROOT_FSTYPE=$(findmnt -kno FSTYPE /)
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CRYPT_PART_UUID=$(blkid | sed -n 's;/dev/.*_crypt.*UUID="\(.*\)".*TYPE=.*;\1;p')
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temp_kernel_list_file="/tmp/kernel.list.temp"
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temp_kernel_command_file="/tmp/kernel.command.temp"
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# Clean old entries {{{
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## Install efibootmgr tool if not available
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command -v efibootmgr > /dev/null || aptitude install -y efibootmgr
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## Get all old entries list with base label
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rm -f -- "${temp_efi_list_file}" ; touch "${temp_efi_list_file}"
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efibootmgr | grep -E ".*${EFI_BASE_LABEL}.*" | cut -c 5-8 > "${temp_efi_list_file}"
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## Remove all matching entries
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while IFS= read -r OLD_EFI_ENTRY; do
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printf "%s\n" "Deleting efiboot entry ${OLD_EFI_ENTRY}"
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efibootmgr --delete-bootnum --bootnum "${OLD_EFI_ENTRY}" > /dev/null || exit 1
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#printf "%s\n" "efibootmgr --delete-bootnum --bootnum ${EFI_ENTRY}"
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done < "${temp_efi_list_file}"
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# }}}
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# Clean old kernels {{{
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## Remove all unified kernels
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find "${EFI_MOUNT_PATH}"/EFI/debian -iname "linux.debian.*.efi" -delete
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# }}}
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# Create unified kernels blob and efiboot entries {{{
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## Install objcopy tool if not available
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command -v objcopy > /dev/null || aptitude install -y binutils
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## Put Kernel command line in temp file
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rm -f -- "${temp_kernel_command_file}" ; touch "${temp_kernel_command_file}"
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printf "%s" "root=UUID=${ROOT_UUID} rootfstype=${ROOT_FSTYPE} add_efi_memmap \
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ro cryptdevice=UUID=${CRYPT_PART_UUID}:lvm" >> "${temp_kernel_command_file}"
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## Get all kernel versions starting with the oldest
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rm -f -- "${temp_kernel_list_file}" ; touch "${temp_kernel_list_file}"
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ls -1tr /boot/vmlinuz-* >> "${temp_kernel_list_file}"
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## For each version of the kernel {{{
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while IFS= read -r KERNEL; do
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### Get kernel version
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KERNEL_VERSION=$(printf "%s" "${KERNEL}" | sed 's;.*vmlinuz-\(.*\);\1;')
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### Ensure EFI device is mounted (excluding systemd-automount line)
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if ! mount | grep -v "autofs" | grep --quiet "${EFI_MOUNT_PATH}"; then
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mount "${EFI_MOUNT_PATH}" || exit 2
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fi
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ESP=$(findmnt -kno SOURCE "${EFI_MOUNT_PATH}" | grep -v systemd | sed s-/dev/--)
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ESP_DISK=$(lsblk /dev/"${ESP}" -no pkname)
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ESP_PART=$(cat /sys/class/block/"${ESP}"/partition)
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### Create a unified kernel
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printf "%s\n" "Creating unified kernel for version ${KERNEL_VERSION}..."
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objcopy \
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--add-section .osrel="/usr/lib/os-release" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="${temp_kernel_command_file}" --change-section-vma .cmdline=0x30000 \
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--add-section .linux="/boot/vmlinuz-${KERNEL_VERSION}" --change-section-vma .linux=0x2000000 \
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--add-section .initrd="/boot/initrd.img-${KERNEL_VERSION}" --change-section-vma .initrd=0x3000000 \
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/usr/lib/systemd/boot/efi/linuxx64.efi.stub "${EFI_MOUNT_PATH}/EFI/debian/linux.debian.${KERNEL_VERSION}.efi"
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### Create a efiboot entry
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printf "%s\n" "Creating efiboot entry for kernel ${KERNEL_VERSION}"
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efibootmgr --disk /dev/"${ESP_DISK}" --part "${ESP_PART}" --create --label "${EFI_BASE_LABEL} ${KERNEL_VERSION}" --loader "\\EFI\\debian\\linux.debian.${KERNEL_VERSION}.efi"
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#printf "%s\n" "efibootmgr --disk /dev/\"${ESP_DISK}\" --part \"${ESP_PART}\" --create --label \"${EFI_BASE_LABEL} ${KERNEL_VERSION}\" --loader \"\\EFI\\debian\\linux.${KERNEL_VERSION}.efi\""
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done < "${temp_kernel_list_file}"
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## }}}
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## Create generic entry for the last version of the kernel {{{
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### Create a unified kernel
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printf "%s\n" "Creating unified generic kernel for the last version (${KERNEL_VERSION})..."
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objcopy \
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--add-section .osrel="/usr/lib/os-release" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="${temp_kernel_command_file}" --change-section-vma .cmdline=0x30000 \
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--add-section .linux="/boot/vmlinuz-${KERNEL_VERSION}" --change-section-vma .linux=0x2000000 \
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--add-section .initrd="/boot/initrd.img-${KERNEL_VERSION}" --change-section-vma .initrd=0x3000000 \
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/usr/lib/systemd/boot/efi/linuxx64.efi.stub "${EFI_MOUNT_PATH}/EFI/debian/linux.debian.efi"
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### Create a efiboot entry
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printf "%s\n" "Creating efiboot generic entry for the last version (${KERNEL_VERSION})"
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efibootmgr --disk /dev/"${ESP_DISK}" --part "${ESP_PART}" --create --label "${EFI_BASE_LABEL}" --loader "\\EFI\\debian\\linux.debian.efi"
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#printf "%s\n" "efibootmgr --disk /dev/\"${ESP_DISK}\" --part \"${ESP_PART}\" --create --label \"${EFI_BASE_LABEL} ${KERNEL_VERSION}\" --loader \"\\EFI\\debian\\linux.efi\""
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## }}}
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# }}}
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## Remove temp files
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rm -f -- "${temp_efi_list_file}" "${temp_kernel_list_file}" "${temp_kernel_command_file}"
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exit 0
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