system copier for resin devices

copycmd.sh

#!/bin/bash

# Copy everything up intil resin-data (mmcblk0p6 usually)
# and send it over the ssh connection, compressed
DEVICE=/dev/mmcblk0
PARTITION=mmcblk0p5
# Get partition end position in blocks
FSSIZE=$(/sbin/fdisk -l -o Device,End ${DEVICE} | grep ${PARTITION} | awk '{ print $2 }')
# Copy data, compress, and send over STDOUT
/bin/dd if=/dev/mmcblk0 conv=sync,noerror bs=512 status=none count=${FSSIZE} | gzip -c

systemcopy.sh

#!/bin/bash

function fatal()
{
	echo $@ >&2

	if [ -f /tmp/systemcopy_err ]; then
		echo -e "\nOUTPUT:\n"
		cat /tmp/systemcopy_err
	fi

	exit 1
}

rm -f /tmp/systemcopy_err

if [ -z "$1" ]; then
	fatal usage: $(basename $0) [device uuid]
fi

if [ ! -f copycmd.sh ]; then
	fatal Missing copycmd.sh file.
fi

uuid=$1

# Gets current script dir, see http://stackoverflow.com/a/246128.
script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
out_dir=${script_dir}/out
out_file=${uuid}_$(date +%Y%m%d%H%M).img.gz
output=${out_dir}/${out_file}

mkdir -p ${out_dir}

ssh_opts="-o Hostname=$uuid.vpn -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no"

echo Executing script...
ssh $ssh_opts resin 'bash -s' <${script_dir}/copycmd.sh >$output 2>/tmp/systemcopy_err
[ "$?" != 0 ] && fatal "ERROR: Script execution failed."

echo Done! Output stored in $out_file