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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
sys="$(hostname -s)"
if ! [ -f "sys/$sys.nix" ]; 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' -not -name default.nix | awk -F / '{print "- " $NF}' | sed 's/\.nix$//' >&2
exit 1
fi
else
sys="$1"
shift
fi
export NIX_PATH=nixos-config=$d/sys/$sys.nix:$d
linkdir="$(mktemp -d)"
link="$linkdir/result"
nix-build -A system --out-link "$link" '<nixpkgs/nixos>' "$@"
path="$(readlink "$link")"
nix-env -p /nix/var/nix/profiles/system --set "$path"
rm -rf "$linkdir"
exec "$path/bin/switch-to-configuration" switch
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