#!/bin/bash

# my nixos rebuild script



build_from_github(){
	export out_path=$(nix build --refresh "github:c2vi/nixos#nixosConfigurations.$host.config.system.build.toplevel" --impure --no-link --print-out-paths $args_to_pass)
	build_exit_code=$?
	echo out_path: $out_path

	return $build_exit_code
}

build_from_local(){
	export out_path=$(nix build "$HOME/work/config#nixosConfigurations.$host.config.system.build.toplevel" --impure --no-link --print-out-paths $args_to_pass)
	build_exit_code=$?

	echo out_path: $out_path

	return $build_exit_code
}

do_switch(){
	if [[ "$host" == "$(hostname)" ]]
	then
		[[ "$boot" == "false" ]] && sudo $out_path/bin/switch-to-configuration switch
		[[ "$boot" == "true" ]] && sudo $out_path/bin/switch-to-configuration boot
	else
		nix path-info $out_path -r | xargs sudo nix store sign -k ~/.mysecrets/nix-private-key
		nix copy --no-check-sigs --no-require-sigs --to ssh-ng://$host $out_path 
		[[ "$boot" == "false" ]] && ssh $host "sudo $out_path/bin/switch-to-configuration switch"
		[[ "$boot" == "true" ]] && ssh $host "sudo $out_path/bin/switch-to-configuration boot"
	fi
}


# main

host=$(hostname)
export host
boot=false
use_github=""
flag=""

while getopts ':gbh:' flag; do
  case "${flag}" in
    h) host="${OPTARG}";;
    b) boot=true;;
    g) use_github=true;;
    *) break;; # makes it so, that at the first unknown option we start passing the rest of the arguments to the nix build command....
  esac
done

if [[ "$use_github" == "true" ]]
then
	echo rebuild from github
	build_from_github && do_switch
else
	echo "rebuild from local (~/work/config/)"
	build_from_local && do_switch
fi