100 lines
2.8 KiB
Nix
100 lines
2.8 KiB
Nix
{ config, lib, pkgs, modules, ... }:
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with lib;
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let
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# Location of the repository on the harddrive
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nixosPath = toString ../..;
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# Check if the path is from the NixOS repository
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isNixOSFile = path:
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let s = toString path; in
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removePrefix nixosPath s != s;
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# Copy modules given as extra configuration files. Unfortunately, we
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# cannot serialized attribute set given in the list of modules (that's why
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# you should use files).
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moduleFiles =
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# FIXME: use typeOf (Nix 1.6.1).
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filter (x: !isAttrs x && !lib.isFunction x) modules;
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# Partition module files because between NixOS and non-NixOS files. NixOS
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# files may change if the repository is updated.
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partitionedModuleFiles =
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let p = partition isNixOSFile moduleFiles; in
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{ nixos = p.right; others = p.wrong; };
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# Path transformed to be valid on the installation device. Thus the
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# device configuration could be rebuild.
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relocatedModuleFiles =
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let
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relocateNixOS = path:
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"<nixpkgs/nixos" + removePrefix nixosPath (toString path) + ">";
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in
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{ nixos = map relocateNixOS partitionedModuleFiles.nixos;
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others = []; # TODO: copy the modules to the install-device repository.
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};
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# A dummy /etc/nixos/configuration.nix in the booted CD that
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# rebuilds the CD's configuration (and allows the configuration to
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# be modified, of course, providing a true live CD). Problem is
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# that we don't really know how the CD was built - the Nix
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# expression language doesn't allow us to query the expression being
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# evaluated. So we'll just hope for the best.
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configClone = pkgs.writeText "configuration.nix"
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''
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{ config, pkgs, ... }:
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{
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imports = [ ${toString config.installer.cloneConfigIncludes} ];
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}
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'';
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in
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{
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options = {
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installer.cloneConfig = mkOption {
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default = true;
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description = ''
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Try to clone the installation-device configuration by re-using it's
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profile from the list of imported modules.
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'';
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};
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installer.cloneConfigIncludes = mkOption {
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default = [];
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example = [ "./nixos/modules/hardware/network/rt73.nix" ];
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description = ''
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List of modules used to re-build this installation device profile.
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'';
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};
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};
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config = {
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installer.cloneConfigIncludes =
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relocatedModuleFiles.nixos ++ relocatedModuleFiles.others;
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boot.postBootCommands =
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''
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# Provide a mount point for nixos-install.
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mkdir -p /mnt
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${optionalString config.installer.cloneConfig ''
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# Provide a configuration for the CD/DVD itself, to allow users
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# to run nixos-rebuild to change the configuration of the
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# running system on the CD/DVD.
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if ! [ -e /etc/nixos/configuration.nix ]; then
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cp ${configClone} /etc/nixos/configuration.nix
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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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