100 lines
2.8 KiB
Plaintext
100 lines
2.8 KiB
Plaintext
# QCOW2 Routines
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export CURRENT_IMAGE
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export CURRENT_MOUNTPOINT
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export NBD_DEV
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export MAP_DEV
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# set in build.sh
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# should be fairly enough for the beginning
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# overwrite here by uncommenting following lines
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# BASE_QCOW2_SIZE=12G
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init_nbd() {
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modprobe nbd max_part=16
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if [ -z "${NBD_DEV}" ]; then
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for x in /sys/class/block/nbd* ; do
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S=`cat $x/size`
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if [ "$S" == "0" ] ; then
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NBD_DEV=/dev/$(basename $x)
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MAP_DEV=/dev/mapper/$(basename $x)p1
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break
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fi
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done
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fi
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}
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# mount qcow2 image: mount_image <image file> <mountpoint>
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mount_qimage() {
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init_nbd
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qemu-nbd --discard=unmap -c $NBD_DEV "$1"
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kpartx -a $NBD_DEV
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mount $MAP_DEV "$2"
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CURRENT_IMAGE="$1"
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CURRENT_MOUNTPOINT="$2"
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}
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export -f mount_qimage
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# umount qcow2 image: umount_image <current mountpoint>
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umount_qimage() {
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while mount | grep -q "$1"; do
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local LOCS
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LOCS=$(mount | grep "$1" | cut -f 3 -d ' ' | sort -r)
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for loc in $LOCS; do
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echo "$loc"
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umount "$loc"
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done
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done
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qemu-nbd -d $NBD_DEV
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kpartx -d $NBD_DEV
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}
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export -f umount_qimage
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# create base image / backing image / mount image
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load_qimage() {
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if [ -z "${CURRENT_MOUNTPOINT}" ]; then
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if [ ! -d "${ROOTFS_DIR}" ]; then mkdir -p "${ROOTFS_DIR}"; fi
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if [ "${CLEAN}" = "1" ] && [ -f "${WORK_DIR}/image-${STAGE}.qcow2" ]; then rm -f "${WORK_DIR}/image-${STAGE}.qcow2"; fi
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if [ ! -f "${WORK_DIR}/image-${STAGE}.qcow2" ]; then
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pushd ${WORK_DIR} > /dev/null
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init_nbd
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if [ -z "${PREV_STAGE}" ]; then
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qemu-img create -f qcow2 image-${STAGE}.qcow2 $BASE_QCOW2_SIZE
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qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
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echo 'type=83' | sfdisk $NBD_DEV
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kpartx -a $NBD_DEV
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mkfs.ext4 $MAP_DEV
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else
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if [ ! -f "${WORK_DIR}/image-${PREV_STAGE}.qcow2" ]; then exit 1; fi
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qemu-img create -f qcow2 \
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-o backing_file=${WORK_DIR}/image-${PREV_STAGE}.qcow2 \
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${WORK_DIR}/image-${STAGE}.qcow2
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qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
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kpartx -a $NBD_DEV
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fi
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mount $MAP_DEV "${ROOTFS_DIR}"
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CURRENT_IMAGE=${WORK_DIR}/image-${STAGE}.qcow2
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CURRENT_MOUNTPOINT=${ROOTFS_DIR}
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popd > /dev/null
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else
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mount_qimage "${WORK_DIR}/image-${STAGE}.qcow2" "${ROOTFS_DIR}"
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fi
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echo "Current image in use: ${CURRENT_IMAGE} (MP: ${CURRENT_MOUNTPOINT})"
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fi
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}
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export -f load_qimage
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# umount current image and refresh mount point env var
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unload_qimage() {
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if [ ! -z "${CURRENT_MOUNTPOINT}" ]; then
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fstrim -v "${CURRENT_MOUNTPOINT}" || true
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umount_qimage "${CURRENT_MOUNTPOINT}"
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CURRENT_IMAGE=""
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CURRENT_MOUNTPOINT=""
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fi
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}
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export -f unload_qimage
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