56 lines
1.8 KiB
Nix
56 lines
1.8 KiB
Nix
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{ config, lib, pkgs, ... }:
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let
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perlWrapped = pkgs.perl.withPackages (p: with p; [ ConfigIniFiles FileSlurp ]);
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in
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{
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options = {
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system.switch.enable = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to include the capability to switch configurations.
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Disabling this makes the system unable to be reconfigured via `nixos-rebuild`.
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This is good for image based appliances where updates are handled
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outside the image. Reducing features makes the image lighter and
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slightly more secure.
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'';
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};
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};
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config = lib.mkIf config.system.switch.enable {
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system.activatableSystemBuilderCommands = ''
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mkdir $out/bin
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substitute ${./switch-to-configuration.pl} $out/bin/switch-to-configuration \
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--subst-var out \
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--subst-var-by toplevel ''${!toplevelVar} \
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--subst-var-by coreutils "${pkgs.coreutils}" \
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--subst-var-by distroId ${lib.escapeShellArg config.system.nixos.distroId} \
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--subst-var-by installBootLoader ${lib.escapeShellArg config.system.build.installBootLoader} \
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--subst-var-by localeArchive "${config.i18n.glibcLocales}/lib/locale/locale-archive" \
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--subst-var-by perl "${perlWrapped}" \
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--subst-var-by shell "${pkgs.bash}/bin/sh" \
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--subst-var-by su "${pkgs.shadow.su}/bin/su" \
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--subst-var-by systemd "${config.systemd.package}" \
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--subst-var-by utillinux "${pkgs.util-linux}" \
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;
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chmod +x $out/bin/switch-to-configuration
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${lib.optionalString (pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) ''
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if ! output=$(${perlWrapped}/bin/perl -c $out/bin/switch-to-configuration 2>&1); then
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echo "switch-to-configuration syntax is not valid:"
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echo "$output"
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exit 1
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fi
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''}
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'';
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};
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}
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