nixpkgs/nixos/doc/manual/configuration/profiles/clone-config.section.md

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# Clone Config {#sec-profile-clone-config}
This profile is used in installer images. It provides an editable
configuration.nix that imports all the modules that were also used when
creating the image in the first place. As a result it allows users to edit
and rebuild the live-system.
On images where the installation media also becomes an installation target,
copying over `configuration.nix` should be disabled by
setting `installer.cloneConfig` to `false`.
For example, this is done in `sd-image-aarch64-installer.nix`.