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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)
ROUND_SIZE="$((4 * 1024 * 1024))"
ROUNDED_ROOT_SECTOR=$(((2 * BOOT_SIZE + ROUND_SIZE) / ROUND_SIZE * ROUND_SIZE / 512 + 8192))
IMG_SIZE=$(((BOOT_SIZE + TOTAL_SIZE + (800 * 1024 * 1024) + ROUND_SIZE - 1) / ROUND_SIZE * ROUND_SIZE))
truncate -s "${IMG_SIZE}" "${IMG_FILE}"
fdisk -H 255 -S 63 "${IMG_FILE}" <<EOF
o
n
8192
+$((BOOT_SIZE * 2 /512))
p
t
c
n
${ROUNDED_ROOT_SECTOR}
p
w
EOF
PARTED_OUT=$(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 $ROOT_LENGTH"
ROOT_FEATURES="^huge_file"
for FEATURE in metadata_csum 64bit; do
if grep -q "$FEATURE" /etc/mke2fs.conf; then
ROOT_FEATURES="^$FEATURE,$ROOT_FEATURES"
fi
done
mkdosfs -n boot -F 32 -v "$BOOT_DEV" > /dev/null
mkfs.ext4 -L rootfs -O "$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}/"
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