peach-img-builder/rpi3-resizerootfs

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#!/bin/sh
roottmp=$(lsblk -l -o MAJ:MIN,MOUNTPOINT | grep '/$')
rootpart=/dev/block/${roottmp% /}
rootdev=${rootpart%:*}:0
flock $rootdev sfdisk -f $rootdev -N 2 <<EOF
,+
EOF
sleep 5
udevadm settle
sleep 5
flock $rootdev partprobe $rootdev
mount -o remount,rw $rootpart
resize2fs $rootpart
exit 0