234 lines
7.6 KiB
Bash
234 lines
7.6 KiB
Bash
#!/bin/bash
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# 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_BOOT_DEV
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export MAP_ROOT_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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# find and initialize free block device nodes
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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 $x)
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MAP_BOOT_DEV=/dev/mapper/$(basename $x)p1
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MAP_ROOT_DEV=/dev/mapper/$(basename $x)p2
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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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export -f init_nbd
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# connect image to block device
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connect_blkdev() {
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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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CURRENT_IMAGE="$1"
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}
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export -f connect_blkdev
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# disconnect image from block device
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disconnect_blkdev() {
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kpartx -d $NBD_DEV
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qemu-nbd -d $NBD_DEV
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NBD_DEV=
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MAP_BOOT_DEV=
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MAP_ROOT_DEV=
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CURRENT_IMAGE=
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}
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export -f disconnect_blkdev
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# mount qcow2 image: mount_image <image file> <mountpoint>
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mount_qimage() {
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connect_blkdev "$1"
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mount -v -t ext4 $MAP_ROOT_DEV "$2"
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mkdir -p "${ROOTFS_DIR}/boot"
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mount -v -t vfat $MAP_BOOT_DEV "$2/boot"
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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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sync
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#umount "$1/boot"
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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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while mountpoint -q "$loc" && ! umount "$loc"; do
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sleep 0.1
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done
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done
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done
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CURRENT_MOUNTPOINT=
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disconnect_blkdev
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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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echo "Creating base image: image-${STAGE}.qcow2"
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# -o preallocation=falloc
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qemu-img create -f qcow2 image-${STAGE}.qcow2 $BASE_QCOW2_SIZE
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qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
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sfdisk $NBD_DEV << EOF
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,250MiB,b
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,,83;
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EOF
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kpartx -a $NBD_DEV
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mkdosfs -n boot -F 32 -v $MAP_BOOT_DEV
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mkfs.ext4 -L rootfs -O "^huge_file,^metadata_csum,^64bit" $MAP_ROOT_DEV
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else
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if [ ! -f "${WORK_DIR}/image-${PREV_STAGE}.qcow2" ]; then exit 1; fi
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echo "Creating backing image: image-${STAGE}.qcow2 <- ${WORK_DIR}/image-${PREV_STAGE}.qcow2"
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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 -v -t ext4 $MAP_ROOT_DEV "${ROOTFS_DIR}"
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mkdir -p "${ROOTFS_DIR}/boot"
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mount -v -t vfat $MAP_BOOT_DEV "${ROOTFS_DIR}/boot"
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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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fi
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}
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export -f unload_qimage
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# based on: https://github.com/SirLagz/RaspberryPi-ImgAutoSizer
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# helper function for make_bootable_image, do not call directly
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function resize_qcow2() {
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if [ -z "$CALL_FROM_MBI" ]; then echo "resize_qcow2: cannot be called directly, use make_bootable_image instead"; return 1; fi
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ROOT_MARGIN=$((800*1024*1024))
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PARTED_OUT=`parted -s -m "$NBD_DEV" unit B print`
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PART_NO=`echo "$PARTED_OUT" | grep ext4 | awk -F: ' { print $1 } '`
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PART_START=`echo "$PARTED_OUT" | grep ext4 | awk -F: ' { print substr($2,1,length($2)-1) } '`
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e2fsck -y -f $MAP_ROOT_DEV || true
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DATA_SIZE=`resize2fs -P $MAP_ROOT_DEV | awk -F': ' ' { print $2 } '`
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BLOCK_SIZE=$(dumpe2fs -h $MAP_ROOT_DEV | grep 'Block size' | awk -F': ' ' { print $2 }')
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BLOCK_SIZE=${BLOCK_SIZE// /}
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let DATA_SIZE=$DATA_SIZE+$ROOT_MARGIN/$BLOCK_SIZE
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resize2fs -p $MAP_ROOT_DEV $DATA_SIZE
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sleep 1
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let PART_NEW_SIZE=$DATA_SIZE*$BLOCK_SIZE
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let PART_NEW_END=$PART_START+$PART_NEW_SIZE
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ACT1=`parted -s "$NBD_DEV" rm 2`
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ACT2=`parted -s "$NBD_DEV" unit B mkpart primary $PART_START $PART_NEW_END`
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NEW_IMG_SIZE=`parted -s -m "$NBD_DEV" unit B print free | tail -1 | awk -F: ' { print substr($2,1,length($2)-1) } '`
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}
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export -f resize_qcow2
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# create raw img from qcow2: make_bootable_image <in.qcow2> <out.img>
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function make_bootable_image() {
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EXPORT_QCOW2="$1"
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EXPORT_IMAGE="$2"
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echo "Connect block device to source qcow2"
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connect_blkdev "${EXPORT_QCOW2}"
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echo "Resize fs and partition"
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CALL_FROM_MBI=1
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resize_qcow2
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CALL_FROM_MBI=
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echo "Disconnect block device"
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disconnect_blkdev
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if [ -z "$NEW_IMG_SIZE" ]; then
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echo "NEW_IMG_SIZE could not be calculated, cannot process image. Exit."
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exit 1
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fi
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echo "Shrinking qcow2 image"
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qemu-img resize --shrink "${EXPORT_QCOW2}" $NEW_IMG_SIZE
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echo "Convert qcow2 to raw image"
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qemu-img convert -f qcow2 -O raw "${EXPORT_QCOW2}" "${EXPORT_IMAGE}"
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echo "Get PARTUUIDs from image"
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IMGID="$(blkid -o value -s PTUUID "${EXPORT_IMAGE}")"
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BOOT_PARTUUID="${IMGID}-01"
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echo "Boot: $BOOT_PARTUUID"
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ROOT_PARTUUID="${IMGID}-02"
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echo "Root: $ROOT_PARTUUID"
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echo "Mount image"
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MOUNTROOT=${WORK_DIR}/tmpimage
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mkdir -p $MOUNTROOT
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MOUNTPT=$MOUNTROOT
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PARTITION=2
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mount "${EXPORT_IMAGE}" "$MOUNTPT" -o loop,offset=$[ `/sbin/sfdisk -d "${EXPORT_IMAGE}" | grep "start=" | head -n $PARTITION | tail -n1 | sed 's/.*start=[ ]*//' | sed 's/,.*//'` * 512 ],sizelimit=$[ `/sbin/sfdisk -d "${EXPORT_IMAGE}" | grep "start=" | head -n $PARTITION | tail -n1 | sed 's/.*size=[ ]*//' | sed 's/,.*//'` * 512 ] || exit 1
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MOUNTPT=$MOUNTROOT/boot
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PARTITION=1
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mount "${EXPORT_IMAGE}" "$MOUNTPT" -o loop,offset=$[ `/sbin/sfdisk -d "${EXPORT_IMAGE}" | grep "start=" | head -n $PARTITION | tail -n1 | sed 's/.*start=[ ]*//' | sed 's/,.*//'` * 512 ],sizelimit=$[ `/sbin/sfdisk -d "${EXPORT_IMAGE}" | grep "start=" | head -n $PARTITION | tail -n1 | sed 's/.*size=[ ]*//' | sed 's/,.*//'` * 512 ] || exit 1
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if [ ! -d "${MOUNTROOT}/root" ]; then
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echo "Image damaged or not mounted. Exit."
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exit 1
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fi
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echo "Setup PARTUUIDs"
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if [ ! -z "$BOOT_PARTUUID" ] && [ ! -z "$ROOT_PARTUUID" ]; then
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echo "Set UUIDs to make it bootable"
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sed -i "s/BOOTDEV/PARTUUID=${BOOT_PARTUUID}/" "${MOUNTROOT}/etc/fstab"
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sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${MOUNTROOT}/etc/fstab"
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sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${MOUNTROOT}/boot/cmdline.txt"
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fi
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echo "Umount image"
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umount "${MOUNTROOT}/boot" || exit 1
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umount "${MOUNTROOT}" || exit 1
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echo "Remove qcow2 export image"
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rm -f "${EXPORT_QCOW2}"
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}
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export -f make_bootable_image
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