#!/usr/bin/env nix-shell
#!nix-shell -i bash -p git nixos-install-tools
if [ $# -ne 1 ]; then
    echo "Usage: $0 <config>"
    echo "NOTE: hardware config will be generated from root!"
    echo "Defined configs:"
    cat flake.nix | grep '.lib.nixosSystem' | sed 's/ =.*//' | sed 's/^[ \t]*//;s/[ \t]*$//' | while read cfg; do echo " - $cfg"; done
    exit 1
fi

CONFIG=$1

DERIVATION=".#nixosConfigurations.${CONFIG}.config.system.build.toplevel"
EXTRA_NIX_FLAGS="-vL --accept-flake-config --keep-going --show-trace --option allow-import-from-derivation false"
EXTRA_NIXOS_REBUILD_FLAGS="--sudo --no-reexec --offline" # legacy: --use-remote-sudo --fast

[ -f "host/${CONFIG}/hooks/pre-rebuild.sh" ] && echo "<=== RUNNING PRE-REBUILD HOOK AT host/${CONFIG}/hooks/pre-rebuild.sh ===>" && host/${CONFIG}/hooks/pre-rebuild.sh
[ ! -f "hardware-configuration.nix" ] && echo "<=== GENERATING NEW HARDWARE CONFIG ===>" && nixos-generate-config --show-hardware-config > hardware-configuration.nix
git add -f hardware-configuration.nix
echo "<=== REBUILDING NIXOS CONFIGURATION FOR ${CONFIG} ===>"
nom build $DERIVATION $EXTRA_NIX_FLAGS && echo "<=== SWITCHING TO NEW CONFIGURATION ===>"
git rm --cached hardware-configuration.nix