The compressor to use on the initrd image. May be any of: The name of one of the predefined compressors, see pkgs/build-support/kernel/initrd-compressor-meta.nix for the definitions. A function which, given the nixpkgs package set, returns the path to a compressor tool, e.g. pkgs: "${pkgs.pigz}/bin/pigz" (not recommended, because it does not work when cross-compiling) the full path to a compressor tool, e.g. "${pkgs.pigz}/bin/pigz" The given program should read data from stdin and write it to stdout compressed.

<rendered-html><p><code>zstd</code> if the kernel supports it (5.9+), <code>gzip</code>
if not</p>
</rendered-html>

"xz"