update-cfg

#!/bin/bash

if [ $(id -u) != "0" ]
then
  echo "This script requires root"
  sudo "$0" "$@"
  exit $?
fi

currentDir=$(pwd)
cd $(dirname ${0})

# Working copy of files
cp -a fs_root staging

# Generate qemu config files
mkdir -p staging/etc/conf.d/qemu.d 
for file in config/*; do
    source $file
    echo "args=\"$ARGS\"" > staging/etc/conf.d/qemu.d/$(basename $file)
    echo "haltcmd=\"$HALTCMD\"" >> staging/etc/conf.d/qemu.d/$(basename $file)
done

# Apply passwords to config files
# password file has lines like "ABC=123"
# this will replace all occurances of ${ABC} with 123
for file in $(find staging/ -type f -print); do
    while IFS="=" read placeholder pass; do
       sed -i "s/{{$placeholder}}/$pass/g" $file 
    done < passwords
done

# Copy config in place
cp -rv staging/* /
rm -rf staging

# Make sure systemd has any changes to unit files
systemctl daemon-reload

# Rebuild grub menu
grub-mkconfig -o /boot/grub/grub.cfg

cd ${currentDir}