burrow-pi-img/scripts/qcow2_handling

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#!/bin/bash
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# QCOW2 Routines
export CURRENT_IMAGE
export CURRENT_MOUNTPOINT
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export NBD_DEV
export MAP_BOOT_DEV
export MAP_ROOT_DEV
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# set in build.sh
# should be fairly enough for the beginning
# overwrite here by uncommenting following lines
# BASE_QCOW2_SIZE=12G
# find and initialize free block device nodes
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init_nbd() {
modprobe nbd max_part=16
if [ -z "${NBD_DEV}" ]; then
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for x in /sys/class/block/nbd* ; do
S=`cat $x/size`
if [ "$S" == "0" ] ; then
NBD_DEV=/dev/$(basename $x)
MAP_BOOT_DEV=/dev/mapper/$(basename $x)p1
MAP_ROOT_DEV=/dev/mapper/$(basename $x)p2
break
fi
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done
fi
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}
export -f init_nbd
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# connect image to block device
connect_blkdev() {
init_nbd
qemu-nbd --discard=unmap -c $NBD_DEV "$1"
sync
kpartx -a $NBD_DEV
sync
CURRENT_IMAGE="$1"
}
export -f connect_blkdev
# disconnect image from block device
disconnect_blkdev() {
kpartx -d $NBD_DEV
qemu-nbd -d $NBD_DEV
NBD_DEV=
MAP_BOOT_DEV=
MAP_ROOT_DEV=
CURRENT_IMAGE=
}
export -f disconnect_blkdev
# mount qcow2 image: mount_image <image file> <mountpoint>
mount_qimage() {
connect_blkdev "$1"
mount -v -t ext4 $MAP_ROOT_DEV "$2"
mkdir -p "${ROOTFS_DIR}/boot"
mount -v -t vfat $MAP_BOOT_DEV "$2/boot"
CURRENT_MOUNTPOINT="$2"
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}
export -f mount_qimage
# umount qcow2 image: umount_image <current mountpoint>
umount_qimage() {
sync
#umount "$1/boot"
while mount | grep -q "$1"; do
local LOCS
LOCS=$(mount | grep "$1" | cut -f 3 -d ' ' | sort -r)
for loc in $LOCS; do
echo "$loc"
while mountpoint -q "$loc" && ! umount "$loc"; do
sleep 0.1
done
done
done
CURRENT_MOUNTPOINT=
disconnect_blkdev
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}
export -f umount_qimage
# create base image / backing image / mount image
load_qimage() {
if [ -z "${CURRENT_MOUNTPOINT}" ]; then
if [ ! -d "${ROOTFS_DIR}" ]; then
mkdir -p "${ROOTFS_DIR}";
fi
if [ "${CLEAN}" = "1" ] && [ -f "${WORK_DIR}/image-${STAGE}.qcow2" ]; then
rm -f "${WORK_DIR}/image-${STAGE}.qcow2";
fi
if [ ! -f "${WORK_DIR}/image-${STAGE}.qcow2" ]; then
pushd ${WORK_DIR} > /dev/null
init_nbd
if [ -z "${PREV_STAGE}" ]; then
echo "Creating base image: image-${STAGE}.qcow2"
# -o preallocation=falloc
qemu-img create -f qcow2 image-${STAGE}.qcow2 $BASE_QCOW2_SIZE
sync
qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
sync
sfdisk $NBD_DEV << EOF
4MiB,250MiB,c,*
254MiB,,83;
EOF
sync
kpartx -a $NBD_DEV
mkdosfs -n boot -F 32 -v $MAP_BOOT_DEV
mkfs.ext4 -L rootfs -O "^huge_file,^metadata_csum,^64bit" $MAP_ROOT_DEV
sync
else
if [ ! -f "${WORK_DIR}/image-${PREV_STAGE}.qcow2" ]; then
exit 1;
fi
echo "Creating backing image: image-${STAGE}.qcow2 <- ${WORK_DIR}/image-${PREV_STAGE}.qcow2"
qemu-img create -f qcow2 \
-o backing_file=${WORK_DIR}/image-${PREV_STAGE}.qcow2 \
${WORK_DIR}/image-${STAGE}.qcow2
sync
qemu-nbd --discard=unmap -c $NBD_DEV image-${STAGE}.qcow2
sync
kpartx -a $NBD_DEV
fi
mount -v -t ext4 $MAP_ROOT_DEV "${ROOTFS_DIR}"
mkdir -p "${ROOTFS_DIR}/boot"
mount -v -t vfat $MAP_BOOT_DEV "${ROOTFS_DIR}/boot"
CURRENT_IMAGE=${WORK_DIR}/image-${STAGE}.qcow2
CURRENT_MOUNTPOINT=${ROOTFS_DIR}
popd > /dev/null
else
mount_qimage "${WORK_DIR}/image-${STAGE}.qcow2" "${ROOTFS_DIR}"
fi
echo "Current image in use: ${CURRENT_IMAGE} (MP: ${CURRENT_MOUNTPOINT})"
fi
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}
export -f load_qimage
# umount current image and refresh mount point env var
unload_qimage() {
if [ ! -z "${CURRENT_MOUNTPOINT}" ]; then
fstrim -v "${CURRENT_MOUNTPOINT}" || true
umount_qimage "${CURRENT_MOUNTPOINT}"
fi
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}
export -f unload_qimage
# based on: https://github.com/SirLagz/RaspberryPi-ImgAutoSizer
# helper function for make_bootable_image, do not call directly
function resize_qcow2() {
if [ -z "$CALL_FROM_MBI" ]; then
echo "resize_qcow2: cannot be called directly, use make_bootable_image instead"
return 1
fi
# ROOT_MARGIN=$((800*1024*1024))
ROOT_MARGIN=$((1*1024*1024))
PARTED_OUT=`parted -s -m "$NBD_DEV" unit B print`
PART_NO=`echo "$PARTED_OUT" | grep ext4 | awk -F: ' { print $1 } '`
PART_START=`echo "$PARTED_OUT" | grep ext4 | awk -F: ' { print substr($2,1,length($2)-1) } '`
e2fsck -y -f $MAP_ROOT_DEV || true
DATA_SIZE=`resize2fs -P $MAP_ROOT_DEV | awk -F': ' ' { print $2 } '`
BLOCK_SIZE=$(dumpe2fs -h $MAP_ROOT_DEV | grep 'Block size' | awk -F': ' ' { print $2 }')
BLOCK_SIZE=${BLOCK_SIZE// /}
let DATA_SIZE=$DATA_SIZE+$ROOT_MARGIN/$BLOCK_SIZE
resize2fs -p $MAP_ROOT_DEV $DATA_SIZE
sleep 1
let PART_NEW_SIZE=$DATA_SIZE*$BLOCK_SIZE
let PART_NEW_END=$PART_START+$PART_NEW_SIZE
ACT1=`parted -s "$NBD_DEV" rm 2`
ACT2=`parted -s "$NBD_DEV" unit B mkpart primary $PART_START $PART_NEW_END`
NEW_IMG_SIZE=`parted -s -m "$NBD_DEV" unit B print free | tail -1 | awk -F: ' { print substr($2,1,length($2)-1) } '`
}
export -f resize_qcow2
# create raw img from qcow2: make_bootable_image <in.qcow2> <out.img>
function make_bootable_image() {
EXPORT_QCOW2="$1"
EXPORT_IMAGE="$2"
echo "Connect block device to source qcow2"
connect_blkdev "${EXPORT_QCOW2}"
echo "Resize fs and partition"
CALL_FROM_MBI=1
resize_qcow2
sync
CALL_FROM_MBI=
echo "Disconnect block device"
disconnect_blkdev
if [ -z "$NEW_IMG_SIZE" ]; then
echo "NEW_IMG_SIZE could not be calculated, cannot process image. Exit."
exit 1
fi
echo "Shrinking qcow2 image"
qemu-img resize --shrink "${EXPORT_QCOW2}" $NEW_IMG_SIZE
sync
echo "Convert qcow2 to raw image"
qemu-img convert -f qcow2 -O raw "${EXPORT_QCOW2}" "${EXPORT_IMAGE}"
sync
echo "Get PARTUUIDs from image"
IMGID="$(blkid -o value -s PTUUID "${EXPORT_IMAGE}")"
BOOT_PARTUUID="${IMGID}-01"
echo "Boot: $BOOT_PARTUUID"
ROOT_PARTUUID="${IMGID}-02"
echo "Root: $ROOT_PARTUUID"
echo "Mount image"
MOUNTROOT=${WORK_DIR}/tmpimage
mkdir -p $MOUNTROOT
MOUNTPT=$MOUNTROOT
PARTITION=2
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 $PARTITION | tail -n1 | sed 's/.*size=[ ]*//' | sed 's/,.*//'` * 512 ] || exit 1
MOUNTPT=$MOUNTROOT/boot
PARTITION=1
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 $PARTITION | tail -n1 | sed 's/.*size=[ ]*//' | sed 's/,.*//'` * 512 ] || exit 1
if [ ! -d "${MOUNTROOT}/root" ]; then
echo "Image damaged or not mounted. Exit."
exit 1
fi
echo "Setup PARTUUIDs"
if [ ! -z "$BOOT_PARTUUID" ] && [ ! -z "$ROOT_PARTUUID" ]; then
echo "Set UUIDs to make it bootable"
sed -i "s/BOOTDEV/PARTUUID=${BOOT_PARTUUID}/" "${MOUNTROOT}/etc/fstab"
sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${MOUNTROOT}/etc/fstab"
sed -i "s/ROOTDEV/PARTUUID=${ROOT_PARTUUID}/" "${MOUNTROOT}/boot/cmdline.txt"
fi
echo "Umount image"
sync
umount "${MOUNTROOT}/boot" || exit 1
umount "${MOUNTROOT}" || exit 1
echo "Remove qcow2 export image"
rm -f "${EXPORT_QCOW2}"
}
export -f make_bootable_image