62 lines
2.5 KiB
Bash
62 lines
2.5 KiB
Bash
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#!/bin/bash -e
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IMG_FILE="${STAGE_WORK_DIR}/${IMG_FILENAME}${IMG_SUFFIX}.img"
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unmount_image "${IMG_FILE}"
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rm -f "${IMG_FILE}"
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rm -rf "${ROOTFS_DIR}"
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mkdir -p "${ROOTFS_DIR}"
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BOOT_SIZE="$((256 * 1024 * 1024))"
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ROOT_SIZE=$(du --apparent-size -s "${EXPORT_ROOTFS_DIR}" --exclude var/cache/apt/archives --exclude boot --block-size=1 | cut -f 1)
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# All partition sizes and starts will be aligned to this size
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ALIGN="$((4 * 1024 * 1024))"
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# Add this much space to the calculated file size. This allows for
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# some overhead (since actual space usage is usually rounded up to the
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# filesystem block size) and gives some free space on the resulting
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# image.
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ROOT_MARGIN="$(echo "($ROOT_SIZE * 0.2 + 200 * 1024 * 1024) / 1" | bc)"
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BOOT_PART_START=$((ALIGN))
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BOOT_PART_SIZE=$(((BOOT_SIZE + ALIGN - 1) / ALIGN * ALIGN))
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ROOT_PART_START=$((BOOT_PART_START + BOOT_PART_SIZE))
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ROOT_PART_SIZE=$(((ROOT_SIZE + ROOT_MARGIN + ALIGN - 1) / ALIGN * ALIGN))
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IMG_SIZE=$((BOOT_PART_START + BOOT_PART_SIZE + ROOT_PART_SIZE))
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truncate -s "${IMG_SIZE}" "${IMG_FILE}"
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parted --script "${IMG_FILE}" mklabel msdos
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parted --script "${IMG_FILE}" unit B mkpart primary fat32 "${BOOT_PART_START}" "$((BOOT_PART_START + BOOT_PART_SIZE - 1))"
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parted --script "${IMG_FILE}" unit B mkpart primary ext4 "${ROOT_PART_START}" "$((ROOT_PART_START + ROOT_PART_SIZE - 1))"
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PARTED_OUT=$(parted -sm "${IMG_FILE}" unit b print)
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BOOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^1:' | cut -d':' -f 2 | tr -d B)
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BOOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^1:' | cut -d':' -f 4 | tr -d B)
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ROOT_OFFSET=$(echo "$PARTED_OUT" | grep -e '^2:' | cut -d':' -f 2 | tr -d B)
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ROOT_LENGTH=$(echo "$PARTED_OUT" | grep -e '^2:' | cut -d':' -f 4 | tr -d B)
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BOOT_DEV=$(losetup --show -f -o "${BOOT_OFFSET}" --sizelimit "${BOOT_LENGTH}" "${IMG_FILE}")
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ROOT_DEV=$(losetup --show -f -o "${ROOT_OFFSET}" --sizelimit "${ROOT_LENGTH}" "${IMG_FILE}")
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echo "/boot: offset $BOOT_OFFSET, length $BOOT_LENGTH"
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echo "/: offset $ROOT_OFFSET, length $ROOT_LENGTH"
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ROOT_FEATURES="^huge_file"
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for FEATURE in metadata_csum 64bit; do
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if grep -q "$FEATURE" /etc/mke2fs.conf; then
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ROOT_FEATURES="^$FEATURE,$ROOT_FEATURES"
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fi
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done
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mkdosfs -n boot -F 32 -v "$BOOT_DEV" > /dev/null
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mkfs.ext4 -L rootfs -O "$ROOT_FEATURES" "$ROOT_DEV" > /dev/null
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mount -v "$ROOT_DEV" "${ROOTFS_DIR}" -t ext4
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mkdir -p "${ROOTFS_DIR}/boot"
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mount -v "$BOOT_DEV" "${ROOTFS_DIR}/boot" -t vfat
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rsync -aHAXx --exclude /var/cache/apt/archives --exclude /boot "${EXPORT_ROOTFS_DIR}/" "${ROOTFS_DIR}/"
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rsync -rtx "${EXPORT_ROOTFS_DIR}/boot/" "${ROOTFS_DIR}/boot/"
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