armbian-build/scripts/resize2fs

#!/bin/bash

### BEGIN INIT INFO
# Provides:          resize2fs
# Required-Start:    $local_fs
# Required-Stop:
# Should-Start:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Resize the root filesystem to fill whole rootfs partition
# Description:
### END INIT INFO

case "$1" in
	start)
		local rootpart=$(findmnt -n -o SOURCE /) # i.e. /dev/mmcblk0p1

		# if ext4 and rootfs should be resized then do it
		if [[ $(findmnt -n -o FSTYPE /) == ext4 && ! -f /root/.no_rootfs_resize ]]; then
			echo -e "\n### [resize2fs] Start resizing partition now\n" >>/var/log/armhwinfo.log
			/sbin/resize2fs $rootpart >>/var/log/armhwinfo.log 2>&1
		fi

		# disable further executions of this script
		update-rc.d -f resize2fs remove >/dev/null 2>&1
		;;
esac