#! @shell@ -e # What are we supposed to do? action="$1" showSyntax() { # !!! more or less cut&paste from # system/switch-to-configuration.sh (which we call, of course). cat <<EOF Usage: $0 [switch|boot|test|build] switch: make the configuration the boot default and activate now boot: make the configuration the boot default test: activate the configuration, but don't make it the boot default build: build the configuration, but don't make it the default or activate it EOF exit 1 } if test -z "$action"; then showSyntax; fi # Allow the location of NixOS sources and the system configuration # file to be overridden. NIXOS=${NIXOS:-/etc/nixos/nixos} NIXPKGS=${NIXPKGS:-/etc/nixos/nixpkgs} NIXOS_CONFIG=${NIXOS_CONFIG:-/etc/nixos/configuration.nix} # Pull the manifests defined in the configuration (the "manifests" # attribute). Wonderfully hacky. if test "${NIXOS_PULL:-1}" != 0; then manifests=$(nix-instantiate --eval-only --xml --strict $NIXOS -A manifests \ | grep '<string' | sed 's^.*"\(.*\)".*^\1^g') mkdir -p /nix/var/nix/channel-cache for i in $manifests; do NIX_DOWNLOAD_CACHE=/nix/var/nix/channel-cache nix-pull $i || true done fi # First build Nix, since NixOS may require a newer version than the # current one. Of course, the same goes for Nixpkgs, but Nixpkgs is # more conservative. if test "${NIXOS_BUILD_NIX:-1}" != 0; then if ! nix-build $NIXOS -A nixFallback -o $HOME/nix-tmp; then nix-build $NIXPKGS -A nixUnstable -o $HOME/nix-tmp fi PATH=$HOME/nix-tmp/bin:$PATH fi # Either upgrade the configuration in the system profile (for "switch" # or "boot"), or just build it and create a symlink "result" in the # current directory (for "build" and "test"). if test "$action" = "switch" -o "$action" = "boot"; then nix-env -p /nix/var/nix/profiles/system -f $NIXOS --set -A system pathToConfig=/nix/var/nix/profiles/system elif test "$action" = "test" -o "$action" = "build"; then nix-build $NIXOS -A system -K -k pathToConfig=./result else showSyntax fi # If we're not just building, then make the new configuration the boot # default and/or activate it now. if test "$action" = "switch" -o "$action" = "boot" -o "$action" = "test"; then $pathToConfig/bin/switch-to-configuration "$action" fi if test "$action" = "test"; then cat >&2 <<EOF Warning: if you remove or overwrite the symlink \`$pathToConfig', the active system configuration may be garbage collected! This may render the system inoperable (though a reboot will fix things). EOF fi rm -f $HOME/nix-tmp