Repack OpenPHT images to update certificate authority

repack.sh

#!/bin/bash

set -e

echo "Checking required dependencies..."

which wget >& /dev/null
which parted >& /dev/null
which mksquashfs >& /dev/null
which unsquashfs >& /dev/null

image_url=$1

currdir=$(pwd)
workdir=$(mktemp -d)
imagegz=$(basename ${image_url})
image=$(echo ${imagegz} | sed 's/\.gz//g')

cd $workdir
mkdir img target

echo "Getting new CA certs"
wget https://github.com/RasPlex/RasPlex/files/7270212/cacert.pem.txt
mv cacert.pem.txt cacert.pem

echo "Retrieving target image"
wget $image_url
gunzip $imagegz

offset=$(parted ${image} -s "unit B print" | grep fat16 | awk '{print $2}' | cut -d B -f 1)
sudo mount -o loop,offset=${offset} ${image} img

cp img/SYSTEM* target
cd target
unsquashfs SYSTEM


echo "Installing fixed certificates"
cp ../cacert.pem squashfs-root/etc/ssl/cert.pem
cp ../cacert.pem squashfs-root/usr/share/XBMC/system/cacert.pem

rm SYSTEM

echo "Repackaging image"
sudo mksquashfs squashfs-root SYSTEM -comp gzip

cd ..
md5sum target/SYSTEM > target/SYSTEM.md5

sudo cp target/SYSTEM* img
sudo umount img

target="${currdir}/FIXED-${image}"
cp ${image} ${target}
cd ${currdir}

rm -rf ${workdir}

echo "Repacked image is at ${target}"

Usage is like this:

./repack.sh https://github.com/RasPlex/OpenPHT/releases/download/v1.8.0.148-573b6d73/OpenPHT-Embedded-1.8.0.148-573b6d73-Generic.x86_64.img.gz

If you are missing dependencies, run with bash -x repack.sh to see what dependency it failed to detect.

Please forgive my ignorance, but what program do you use to run this script? I have a different version that I need updated and I have no idea how to do it. Willing to do some research but is there any program name you could give me to at least point me in the right direction?

you basically need to run this on any linux machine, the script itself is written in BASH, but you'll need to have a few tools installed (gparted, squashfs-tools, wget). If you don't have a linux computer, you can try installing ubuntu in Virtualbox or with Vagrant.