#!/usr/bin/env bash
# Install this repo's system nix.conf into place. Idempotent.
#
#   sudo ./install.sh   update /etc/nix/nix.conf (backs up the current one)
#
# The user-level ~/.config/nix/nix.conf is managed declaratively by Home
# Manager (see home/default.nix).

set -euo pipefail

repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
conf_file="$repo_dir/config/nix.conf"
target=/etc/nix/nix.conf

if [ ! -d "$(dirname "$target")" ]; then
  sudo mkdir -p "$(dirname "$target")"
fi
if [ -f "$target" ] && ! cmp -s "$conf_file" "$target"; then
  sudo cp -a "$target" "$target.bak.$(date +%Y%m%d%H%M%S)"
fi
sudo cp "$conf_file" "$target"
echo "installed $target"