meta-sysmocom-bsp/recipes-sysmobts/sysmobts2100-devtools/files/mkrootfsimg

#!/bin/bash

set -xe

IMGTAR=${1:-sysmocom-core-image-sysmobts2100.tar.gz}

if [ ! -f "${IMGTAR}" ]; then
        echo "file ${IMGTAR} not found, exit"
        exit 1
fi

IMGFILE=${IMGTAR}.img
MOUNTDIR="$(mktemp -d)"

mv $IMGFILE $IMGFILE-old || true
dd if=/dev/zero of=${IMGFILE} bs=128M count=1
/sbin/mkfs -t ext4 -O ^64bit ${IMGFILE}
sudo mount -t ext4 -o loop ${IMGFILE} ${MOUNTDIR}/
sudo tar -zxf ${IMGTAR} -C ${MOUNTDIR}/
sync
sudo umount ${MOUNTDIR}
rmdir ${MOUNTDIR}