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#! /usr/bin/env bash

# IMPORTANT: Don't use nix-shell shebang!
# If a config has generated an invalid NIX_PATH, it still needs to be
# possible to rescue the system by activating a different configuration.

set -ueo pipefail

d="$(dirname $0)"

if [ "$#" -eq 0 ]; then
    echo -e "\e[31;1merror:\e[0m must specify a system definition" >&2
    echo "Available system definitions are:" >&2
    find $d/sys -name *.nix | awk -F / '{print "- " $NF}' | sed 's/\.nix$//' >&2
    exit 1
fi

sys="$1"
shift

export NIX_PATH=nixos-config=$d/sys/$sys.nix:$d
link="$(mktemp -d)/result"
nix build -f '<nixpkgs/nixos>' --out-link "$link" "$@" system
path="$(readlink "$link")"
nix-env -p /nix/var/nix/profiles/system --set "$path"
exec "$path/bin/switch-to-configuration" switch