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#!/usr/bin/env bash
set -euo pipefail
# Enable all future paths in this script to be relative to the directory containing the script.
cd "$(dirname -- "${BASH_SOURCE[0]}")"
configPath=$(realpath -- "hosts/$HOSTNAME/default.nix")
if [ ! -f $configPath ]; then
echo "aborting: $configPath doesn't exist"
exit 1
fi
nix-eval() {
# FUTURE: use --raw when upgrading to NixOS 25.05
nix-instantiate --eval --read-write-mode "$@" \
| tr -d \" # nix-instantiate has no raw output yet (like the experimental nix eval)
}
channel=$(nix-eval --argstr host "$HOSTNAME" --expr '{host}:
let
toml = builtins.readFile ./hosts/${host}/metadata.toml;
in
(builtins.fromTOML toml).channel
')
nixpkgsPath=$(nix-eval --argstr channel "$channel" --expr '{channel}: (import ./npins).${channel}.outPath')
# nixos-rebuild always reads Nixpkgs from the NIX_PATH,
# so we need to set it explicitly to our pinned version
exec nixos-rebuild "$@" -I nixpkgs="$nixpkgsPath" -I nixos-config="$configPath" -I top="$(pwd)"
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