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https://github.com/flatcar/scripts.git
synced 2026-05-04 19:56:32 +02:00
fix(image_to_vm): Move to disk_util, modify images in-place.
Avoid unpacking/repacking partitions by using disk_util's resize and mount commands. Also simplify assorted bits along the way.
This commit is contained in:
Michael Marineau
parent
e066f91ca3
commit
bfcbb3f57f
@ -27,6 +27,7 @@ VM_IMG_TYPE=DEFAULT
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VM_SRC_IMG=
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VM_TMP_IMG=
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VM_TMP_DIR=
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VM_TMP_ROOT=
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VM_DST_IMG=
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VM_README=
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VM_NAME=
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@ -149,6 +150,7 @@ set_vm_paths() {
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VM_DST_IMG="${dst_dir}/${dst_name}"
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VM_TMP_DIR="${dst_dir}/${dst_name}.vmtmpdir"
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VM_TMP_IMG="${VM_TMP_DIR}/disk_image.bin"
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VM_TMP_ROOT="${VM_TMP_DIR}/rootfs"
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VM_NAME="$(_src_to_dst_name "${src_name}" "")-${COREOS_VERSION_STRING}"
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VM_UUID=$(uuidgen)
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VM_README="${dst_dir}/$(_src_to_dst_name "${src_name}" ".README")"
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@ -195,93 +197,46 @@ _disk_ext() {
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esac
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}
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# Unpack the source disk to individual partitions.
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# Start new image using the given disk layout.
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unpack_source_disk() {
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get_disk_layout_type $(_get_vm_opt DISK_LAYOUT)
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info "Unpacking source image to $(relpath "${VM_TMP_DIR}")"
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setup_disk_image() {
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local disk_layout="${1:-$(_get_vm_opt DISK_LAYOUT)}"
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rm -rf "${VM_TMP_DIR}"
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mkdir -p "${VM_TMP_DIR}"
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mkdir -p "${VM_TMP_DIR}" "${VM_TMP_ROOT}"
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pushd "${VM_TMP_DIR}" >/dev/null
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local src_dir=$(dirname "${VM_SRC_IMG}")
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"${src_dir}/unpack_partitions.sh" "${VM_SRC_IMG}"
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popd >/dev/null
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# Partition paths that have been unpacked from VM_SRC_IMG
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TEMP_ESP="${VM_TMP_DIR}"/part_${NUM_ESP}
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TEMP_OEM="${VM_TMP_DIR}"/part_${NUM_OEM}
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TEMP_ROOTFS="${VM_TMP_DIR}"/part_${NUM_ROOTFS_A}
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TEMP_STATE="${VM_TMP_DIR}"/part_${NUM_STATEFUL}
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info "Initializing new disk image..."
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cp --sparse=always "${VM_SRC_IMG}" "${VM_TMP_IMG}"
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if [[ $(_get_vm_opt PARTITIONED_IMG) -eq 1 ]]; then
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info "Initializing new partition table..."
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write_partition_table "${VM_TMP_IMG}"
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fi
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}
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resize_state_partition() {
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get_disk_layout_type $(_get_vm_opt DISK_LAYOUT)
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local size_in_bytes=$(get_filesystem_size ${NUM_STATEFUL})
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local size_in_sectors=$(( size_in_bytes / 512 ))
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local size_in_mb=$(( size_in_bytes / 1024 / 1024 ))
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local original_size=$(stat -c%s "${TEMP_STATE}")
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if [[ "${original_size}" -gt "${size_in_bytes}" ]]; then
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die "Cannot resize state image to smaller than original."
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# TODO(marineam): Fix this so --mbr_boot_code isn't required
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local mbr_img="/usr/share/syslinux/gptmbr.bin"
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"${BUILD_LIBRARY_DIR}/disk_util" --disk_layout="${disk_layout}" \
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resize --mbr_boot_code="${mbr_img}" "${VM_TMP_IMG}"
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fi
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info "Resizing state partition to ${size_in_mb}MB"
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/sbin/e2fsck -pf "${TEMP_STATE}"
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/sbin/resize2fs "${TEMP_STATE}" "${size_in_sectors}s"
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info "Mounting image to $(relpath "${VM_TMP_ROOT}")"
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"${BUILD_LIBRARY_DIR}/disk_util" --disk_layout="${disk_layout}" \
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mount "${VM_TMP_IMG}" "${VM_TMP_ROOT}"
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}
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# If the current type defines a oem package install it to the given fs image.
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install_oem_package() {
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local oem_pkg=$(_get_vm_opt OEM_PACKAGE)
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local oem_mnt="${VM_TMP_DIR}/oem"
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local oem_mnt="${VM_TMP_ROOT}/usr/share/oem"
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if [[ -z "${oem_pkg}" ]]; then
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return 0
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fi
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mkdir -p "${oem_mnt}"
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# Install directly to root if this is not a partitioned image
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if [[ $(_get_vm_opt PARTITIONED_IMG) -eq 0 ]]; then
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emerge_oem_package "${oem_mnt}"
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return 0
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fi
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sudo mount -o loop "${TEMP_OEM}" "${oem_mnt}"
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emerge_oem_package ${oem_mnt}
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sudo umount "${oem_mnt}"
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rm -rf "${oem_mnt}"
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}
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emerge_oem_package() {
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local oem_pkg=$(_get_vm_opt OEM_PACKAGE)
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info "Installing ${oem_pkg} to OEM partition"
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# TODO(polvi): figure out how to keep portage from putting these
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# portage files on disk, we don't need or want them.
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emerge-${BOARD} --root="$1" --root-deps=rdeps "${oem_pkg}"
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emerge-${BOARD} --root="${oem_mnt}" --root-deps=rdeps "${oem_pkg}"
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sudo rm -rf "${oem_mnt}/var" # clean out /var/pkg/db and friends
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}
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# Write the vm disk image to the target directory in the proper format
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write_vm_disk() {
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if [[ $(_get_vm_opt PARTITIONED_IMG) -eq 1 ]]; then
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info "Writing partitions to new disk image"
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dd if="${TEMP_ROOTFS}" of="${VM_TMP_IMG}" conv=notrunc,sparse \
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bs=512 seek=$(partoffset ${VM_TMP_IMG} ${NUM_ROOTFS_A})
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dd if="${TEMP_STATE}" of="${VM_TMP_IMG}" conv=notrunc,sparse \
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bs=512 seek=$(partoffset ${VM_TMP_IMG} ${NUM_STATEFUL})
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dd if="${TEMP_ESP}" of="${VM_TMP_IMG}" conv=notrunc,sparse \
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bs=512 seek=$(partoffset ${VM_TMP_IMG} ${NUM_ESP})
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dd if="${TEMP_OEM}" of="${VM_TMP_IMG}" conv=notrunc,sparse \
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bs=512 seek=$(partoffset ${VM_TMP_IMG} ${NUM_OEM})
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# unmount before creating block device images
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cleanup_mounts "${VM_TMP_ROOT}"
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fi
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if [[ $(_get_vm_opt HYBRID_MBR) -eq 1 ]]; then
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@ -327,60 +282,23 @@ _write_vmdk_scsi_disk() {
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qemu-img convert -f raw "$1" -O vmdk -o adapter_type=lsilogic "$2"
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}
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# the cpio is a little complicated because everything gets put into one
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# ramfs. So, it does a lot more work at the write disk step.
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# The cpio "disk" is a bit special,
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# consists of a kernel+initrd not a block device
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_write_cpio_disk() {
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local cpio_target="${VM_TMP_DIR}/rootcpio"
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if [ -f "$2" ]; then
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rm $2
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fi
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# Create the cpio with squashfs embedded
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_write_squashfs_root ${cpio_target}
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# Create the cpio and gzip it
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local cpio=${VM_TMP_DIR}/root.cpio
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_write_dir_to_cpio "${cpio_target}" "${cpio}"
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gzip < ${cpio} > $2
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rm -rf "${cpio_target}"
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}
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_write_dir_to_cpio() {
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pushd "$1" >/dev/null
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append_flag=""
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if [ -f "$2" ]; then
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append_flag="-A"
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fi
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sudo find ./ | sudo cpio -o ${append_flag} -H newc -O "$2"
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popd >/dev/null
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}
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_write_squashfs_root() {
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local cpio_target="$1"
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local root_mnt="${VM_TMP_DIR}/rootfs"
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local oem_mnt="${VM_TMP_DIR}/oem"
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local dst_dir=$(_dst_dir)
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local vmlinuz_name="$(_dst_name ".vmlinuz")"
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mkdir -p "${root_mnt}"
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# Build the squashfs, embed squashfs into a gzipped cpio
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mkdir -p "${cpio_target}"
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pushd "${cpio_target}" >/dev/null
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sudo mksquashfs "${VM_TMP_ROOT}" ./newroot.squashfs
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echo ./newroot.squashfs | cpio -o -H newc | gzip > "$2"
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popd >/dev/null
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# Roll the rootfs into the build dir
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sudo mount -o loop,ro "${TEMP_ROOTFS}" "${root_mnt}"
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# Roll the OEM into the build dir
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sudo mount --bind "${oem_mnt}" "${root_mnt}"/usr/share/oem
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# Build the squashfs
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sudo mksquashfs "${root_mnt}" "${cpio_target}"/newroot.squashfs
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cp "${root_mnt}"/boot/vmlinuz "${dst_dir}/${vmlinuz_name}"
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sudo umount "${root_mnt}"/usr/share/oem
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sudo umount "${root_mnt}"
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sudo rm -rf "${root_mnt}"
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# Pull the kernel out of the root filesystem
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cp "${VM_TMP_ROOT}"/boot/vmlinuz "${dst_dir}/${vmlinuz_name}"
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VM_GENERATED_FILES+=( "${dst_dir}/${vmlinuz_name}" )
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}
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# If a config format is defined write it!
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@ -427,7 +345,6 @@ EOF
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_write_pxe_conf() {
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local dst_name=$(basename "$VM_DST_IMG")
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local dst_dir=$(_dst_dir)
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local vmlinuz_name="$(_dst_name ".vmlinuz")"
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cat >"${VM_README}" <<EOF
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@ -438,7 +355,7 @@ If you have qemu installed (or in the SDK), you can start the image with:
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EOF
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VM_GENERATED_FILES+=( "${dst_dir}/${vmlinuz_name}" "${VM_README}" )
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VM_GENERATED_FILES+=( "${VM_README}" )
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}
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# Generate the vmware config file
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@ -701,6 +618,9 @@ _write_gce_conf() {
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vm_cleanup() {
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info "Cleaning up temporary files"
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if mountpoint -q "${VM_TMP_ROOT}"; then
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cleanup_mounts "${VM_TMP_ROOT}"
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fi
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sudo rm -rf "${VM_TMP_DIR}"
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}
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@ -103,10 +103,8 @@ legacy_offset_size_export ${VM_SRC_IMG}
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# Make sure things are cleaned up on failure
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trap vm_cleanup EXIT
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# Unpack image
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# Resize to use all available space in new disk layout
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unpack_source_disk
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resize_state_partition
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# Setup new (raw) image, possibly resizing filesystems
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setup_disk_image "${FLAGS_disk_layout}"
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# Optionally install any OEM packages
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install_oem_package
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