| #!/bin/bash |
| # |
| # Copyright 2021 The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| # Expected environment variables: |
| # |
| # "ARTIFACTDIR": the debos artifact directory. |
| |
| # Create a qcow2 file from the partition. |
| # |
| # The raw disk image debos provides begins with a (GPT-based) partition table, |
| # consisting of a single partition. We only want the single partition, and not |
| # the leading/trailing GPT metadata. |
| # |
| # To get the partition contents, we umount the filesystem and just copy out |
| # the raw data from the partition's block device. |
| # |
| |
| # The block device to operate on. |
| # |
| # The name "root" comes from the "image-partition" action's partition label. |
| BLOCK_DEVICE=/dev/disk/by-label/root |
| |
| # Unmount the disk. |
| umount ${BLOCK_DEVICE} |
| |
| # Zero out free blocks in the image. This zeros out temporary/deleted data, |
| # improving compression of the final image. |
| zerofree ${BLOCK_DEVICE} |
| |
| # Create an image from the partition. |
| qemu-img convert -f raw -O qcow2 ${BLOCK_DEVICE} "${ARTIFACTDIR}/rootfs.qcow2" |
| |
| # Remount the disk. |
| mount ${BLOCK_DEVICE} ${IMAGEMNTDIR} |
