livecd-rootfs/live-build/ubuntu-cpc/hooks.d/base/disk-image-uefi.binary

#!/bin/bash -eux

case $ARCH in
    amd64|arm64|riscv64)
        ;;
    *)
        echo "We don't create EFI images for $ARCH."
        exit 0
        ;;
esac

IMAGE_STR="# CLOUD_IMG: This file was created/modified by the Cloud Image build process"
FS_LABEL="cloudimg-rootfs"

case "$ARCH" in
  amd64|arm64|armhf)
    # 3.5 GiB
    # Since Kinetic amd64 need more then the default 2.2G
    # Since Jammy armhf need more then the default 2.2G
    # Since Mantic arm64 need more then the default 2.2G
    IMAGE_SIZE=3758096384 # bump to 3.5G (3584*1024**2);
    ;;
  riscv64)
    # 4.5 GiB
    # initrd creation fails with "No space left" with 3.5G
    IMAGE_SIZE=4831838208 # bump to 4.5G (4608*1024**2);
    ;;
esac

. config/binary

. config/functions

create_partitions() {
    disk_image="$1"
    sgdisk "${disk_image}" --zap-all
    case $ARCH in
        arm64|armhf)
            sgdisk "${disk_image}" \
                   --new=15:0:204800 \
                   --typecode=15:ef00 \
                   --new=16::1G \
                   --typecode=16:ea00 \
                   --new=1:
            ;;
        riscv64)
            sgdisk "${disk_image}" \
                   --set-alignment=2 \
                   --new=15::+106M \
                   --typecode=15:ef00 \
                   --new=16::1G \
                   --typecode=16:ea00 \
                   --new=1:: \
                   --attributes=1:set:2
            ;;
        amd64)
            sgdisk "${disk_image}" \
                   --new=14::+4M \
                   --new=15::+106M \
                   --new=16::1G \
                   --typecode=16:ea00 \
                   --new=1::
            sgdisk "${disk_image}" \
                   -t 14:ef02 \
                   -t 15:ef00
            ;;
    esac
    sgdisk "${disk_image}" \
        --print
}

create_and_mount_boot_partitions() {
    uefi_dev="${loop_device}p15"
    boot_dev="${loop_device}p16"
    mountpoint="$1"

    mkfs.vfat -F 32 -n UEFI "${uefi_dev}"
    mkfs.ext4 -L BOOT "${boot_dev}"

    # copying what was on the rootfs to the new boot partition
    mount "${boot_dev}" "${mountpoint}"/mnt
    mv "${mountpoint}"/boot/* "${mountpoint}"/mnt
    umount "${boot_dev}"

    mount "${boot_dev}" "${mountpoint}"/boot

    mkdir -p "${mountpoint}"/boot/efi
    mount "${uefi_dev}" "$mountpoint"/boot/efi

    cat << EOF >> "mountpoint/etc/fstab"
LABEL=BOOT	/boot	ext4	defaults	0 2
LABEL=UEFI	/boot/efi	vfat	umask=0077	0 1
EOF
}

install_grub() {
    mkdir mountpoint
    mount_partition "${rootfs_dev_mapper}" mountpoint

    create_and_mount_boot_partitions mountpoint

    echo "(hd0) ${loop_device}" > mountpoint/tmp/device.map
    mkdir -p mountpoint/etc/default/grub.d
    efi_boot_dir="/boot/efi/EFI/BOOT"
    chroot mountpoint mkdir -p "${efi_boot_dir}"

    chroot mountpoint apt-get -y update

    package_install_recommends_option=""
    # minimized cloud image policy, introduced in version 23.10.16, is to not install recommends for any package
    # installs during build. This is to keep the image as small as possible. This also extends to
    # the grub related packages.
    if [ "${SUBPROJECT:-}" = minimized ]; then
        package_install_recommends_option="--no-install-recommends"
    fi

    # UEFI GRUB modules are meant to be used equally by Secure Boot and
    # non-Secure Boot systems. If you need an extra module not already
    # provided or run into "Secure Boot policy forbids loading X" problems,
    # please file a bug against grub2 to include the affected module.
    case $ARCH in
        arm64)
            chroot mountpoint apt-get -qqy install ${package_install_recommends_option} shim-signed grub-efi-arm64-signed
            efi_target=arm64-efi
            ;;
        armhf)
            chroot mountpoint apt-get -qqy install ${package_install_recommends_option} grub-efi-arm grub-efi-arm-bin
            efi_target=arm-efi
            ;;
        amd64)
            chroot mountpoint apt-get install -qqy ${package_install_recommends_option} grub-pc shim-signed
            efi_target=x86_64-efi
            # set the required debconf settings to allow for non interactive grub updates in cloud images LP: #2054103
            echo "grub-pc grub-efi/cloud_style_installation boolean true" | chroot mountpoint debconf-set-selections
            echo "grub-pc grub-pc/cloud_style_installation boolean true" | chroot mountpoint debconf-set-selections
            ;;
        riscv64)
            chroot mountpoint apt-get install -qqy ${package_install_recommends_option} u-boot-menu grub-efi-riscv64
            efi_target=riscv64-efi

            chroot mountpoint u-boot-update
            ;;
    esac

    chroot mountpoint apt-get autoremove --purge --assume-yes

    chroot mountpoint grub-install "${loop_device}" \
        --boot-directory=/boot \
        --efi-directory=/boot/efi \
        --target=${efi_target} \
        --uefi-secure-boot \
        --no-nvram

    if [ "$ARCH" = "amd64" ]; then
        # Install the BIOS/GPT bits. Since GPT boots from the ESP partition,
        # it means that we just run this simple command and we're done
        chroot mountpoint grub-install --target=i386-pc "${loop_device}"
    fi

    # Use initrdless boot for minimal images
    if [ "${SUBPROJECT:-}" = "minimized" ]; then
        force_boot_without_initramfs mountpoint
    fi

    # This call to rewrite the debian package manifest is added here to capture
    # grub-efi packages that otherwise would not make it into the base
    # manifest. filesystem.packages is moved into place via symlinking to
    # livecd.ubuntu-cpc.manifest by live-build/auto/build after lb_binary runs
    # and at that time snaps are added to the manifest (create-manifest is
    # not called here as it calls snap-seed-parse, resulting in duplicate
    # snap listings)
    chroot mountpoint dpkg-query -W > binary/boot/filesystem.packages

    divert_grub mountpoint
    track_initramfs_boot_fallback mountpoint
    chroot mountpoint update-grub
    replace_grub_root_with_label mountpoint
    undivert_grub mountpoint

    chroot mountpoint apt-get -y clean

    rm mountpoint/tmp/device.map
    umount -R mountpoint/boot
    mount

    # create sorted filelist as the very last step before unmounting
    (cd mountpoint && find -xdev) | sort > binary/boot/filesystem.filelist

    umount_partition mountpoint
    rmdir mountpoint
}

disk_image=binary/boot/disk-uefi.ext4

create_empty_disk_image "${disk_image}"
create_partitions "${disk_image}"
mount_image "${disk_image}" 1

# Copy the chroot in to the disk
make_ext4_partition "${rootfs_dev_mapper}"
mkdir mountpoint
mount "${rootfs_dev_mapper}" mountpoint
cp -a chroot/* mountpoint/
umount mountpoint
rmdir mountpoint

install_grub

clean_loops
trap - EXIT