#!/usr/bin/env bash

REAL_BASE_DIR=$( dirname $( realpath "$0" ) )

# Wrapper for nixos-rebuild operations, which act locally.

# Takes the following arguments supplied as environment variables.
# HOST: The host as defined in nixosConfigurations.
# OPERATION: The nixos-rebuild operation to execute. Can be one of:
#            build, build-vm, build-vm-with-bootloader
#            All operations are as defined in the nixos-rebuild man page.

if [ -z $HOST ]; then
    $REAL_BASE_DIR/../helper/msg_error.sh "\
Internal Error: No host given.
A host needs to be provided via the HOST environment variable."
    exit 1
fi

if [ -z $OPERATION ]; then
    $REAL_BASE_DIR/../helper/msg_error.sh "\
Internal Error: No operation given.
An operation needs to be provided via the OPERATION environment variable."
    exit 1
fi

case $OPERATION in
    build|build-vm|build-vm-with-bootloader)
        ;;
    *)
        $REAL_BASE_DIR/../helper/msg_error.sh "\
Internal Error: No valid operation given.
The operation provided via the OPERATION environment variable needs to be one of:
build, build-vm, build-vm-with-bootloader."
        exit 1
        ;;
esac


set -e

$REAL_BASE_DIR/../helper/msg_info.sh "\
Running nixos-rebuild $OPERATION for $HOST..."

nixos-rebuild "$OPERATION" --flake ".#$HOST"