Burrow Raspberry Pi Image
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#!/bin/bash -e
IMG_FILE="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img"
unmount_image ${IMG_FILE}
rm -f ${IMG_FILE}
rm -rf ${ROOTFS_DIR}
mkdir -p ${ROOTFS_DIR}
BOOT_SIZE=$(du --apparent-size -s ${EXPORT_ROOTFS_DIR}/boot --block-size=1 | cut -f 1)
TOTAL_SIZE=$(du --apparent-size -s ${EXPORT_ROOTFS_DIR} --exclude var/cache/apt/archives --block-size=1 | cut -f 1)
IMG_SIZE=$((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024)))
truncate -s ${IMG_SIZE} ${IMG_FILE}
fdisk -H 255 -S 63 ${IMG_FILE} <<EOF
o
n
8192
+$((BOOT_SIZE * 2 /512))
p
t
c
n
8192
p
w
EOF
PARTED_OUT=$(parted -s ${IMG_FILE} unit b print)
BOOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^ 1'| xargs echo -n \
| cut -d" " -f 2 | tr -d B)
BOOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^ 1'| xargs echo -n \
| cut -d" " -f 4 | tr -d B)
ROOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^ 2'| xargs echo -n \
| cut -d" " -f 2 | tr -d B)
ROOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^ 2'| xargs echo -n \
| cut -d" " -f 4 | tr -d B)
BOOT_DEV=$(losetup --show -f -o ${BOOT_OFFSET} --sizelimit ${BOOT_LENGTH} ${IMG_FILE})
ROOT_DEV=$(losetup --show -f -o ${ROOT_OFFSET} --sizelimit ${ROOT_LENGTH} ${IMG_FILE})
echo "/boot: offset $BOOT_OFFSET, length $BOOT_LENGTH"
echo "/: offset $ROOT_OFFSET, length $ROOT_LENGTH"
ROOT_FEATURES="^huge_file"
if grep -q "metadata_csum" /etc/mke2fs.conf; then
ROOT_FEATURES="^metadata_csum,$ROOT_FEATURES"
fi
mkdosfs -n boot -F 32 -v $BOOT_DEV > /dev/null
mkfs.ext4 -O $ROOT_FEATURES $ROOT_DEV > /dev/null
mount -v $ROOT_DEV ${ROOTFS_DIR} -t ext4
mkdir -p ${ROOTFS_DIR}/boot
mount -v $BOOT_DEV ${ROOTFS_DIR}/boot -t vfat
rsync -aHAXx --exclude var/cache/apt/archives ${EXPORT_ROOTFS_DIR}/ ${ROOTFS_DIR}/