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|
{ config, lib, pkgs, ... }:
let
perlWrapped = pkgs.perl.withPackages (p: with p; [ ConfigIniFiles FileSlurp ]);
description = extra: ''
Whether to include the capability to switch configurations.
Disabling this makes the system unable to be reconfigured via `nixos-rebuild`.
${extra}
'';
in
{
options.system.switch = {
enable = lib.mkOption {
type = lib.types.bool;
default = true;
description = description ''
This is good for image based appliances where updates are handled
outside the image. Reducing features makes the image lighter and
slightly more secure.
'';
};
enableNg = lib.mkOption {
type = lib.types.bool;
default = false;
description = description ''
Whether to use `switch-to-configuration-ng`, an experimental
re-implementation of `switch-to-configuration` with the goal of
replacing the original.
'';
};
};
config = lib.mkMerge [
{
assertions = [{
assertion = with config.system.switch; enable -> !enableNg;
message = "Only one of system.switch.enable and system.switch.enableNg may be enabled at a time";
}];
}
(lib.mkIf config.system.switch.enable {
system.activatableSystemBuilderCommands = ''
mkdir $out/bin
substitute ${./switch-to-configuration.pl} $out/bin/switch-to-configuration \
--subst-var out \
--subst-var-by toplevel ''${!toplevelVar} \
--subst-var-by coreutils "${pkgs.coreutils}" \
--subst-var-by distroId ${lib.escapeShellArg config.system.nixos.distroId} \
--subst-var-by installBootLoader ${lib.escapeShellArg config.system.build.installBootLoader} \
--subst-var-by localeArchive "${config.i18n.glibcLocales}/lib/locale/locale-archive" \
--subst-var-by perl "${perlWrapped}" \
--subst-var-by shell "${pkgs.bash}/bin/sh" \
--subst-var-by su "${pkgs.shadow.su}/bin/su" \
--subst-var-by systemd "${config.systemd.package}" \
--subst-var-by utillinux "${pkgs.util-linux}" \
;
chmod +x $out/bin/switch-to-configuration
${lib.optionalString (pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform) ''
if ! output=$(${perlWrapped}/bin/perl -c $out/bin/switch-to-configuration 2>&1); then
echo "switch-to-configuration syntax is not valid:"
echo "$output"
exit 1
fi
''}
'';
})
(lib.mkIf config.system.switch.enableNg {
# Use a subshell so we can source makeWrapper's setup hook without
# affecting the rest of activatableSystemBuilderCommands.
system.activatableSystemBuilderCommands = ''
(
source ${pkgs.buildPackages.makeWrapper}/nix-support/setup-hook
mkdir $out/bin
ln -sf ${lib.getExe pkgs.switch-to-configuration-ng} $out/bin/switch-to-configuration
wrapProgram $out/bin/switch-to-configuration \
--set OUT $out \
--set TOPLEVEL ''${!toplevelVar} \
--set DISTRO_ID ${lib.escapeShellArg config.system.nixos.distroId} \
--set INSTALL_BOOTLOADER ${lib.escapeShellArg config.system.build.installBootLoader} \
--set LOCALE_ARCHIVE ${config.i18n.glibcLocales}/lib/locale/locale-archive \
--set SYSTEMD ${config.systemd.package}
)
'';
})
];
}
|
