nixpkgs/test/make-initrd.nix

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# Create an initial ramdisk containing the closure of the specified
# `init' package. An initial ramdisk is used during the initial
# stages of booting a Linux system. It is loaded by the boot loader
# along with the kernel image. It's supposed to contain everything
# (such as kernel modules) necessary to allow us to mount the root
# file system. Once the root file system is mounted, the `real' boot
# script can be called.
#
# An initrd is really just a gzipped cpio archive.
#
# A symlink `/init' is made to the store path passed in the `init'
# argument.
{stdenv, cpio, init}:
stdenv.mkDerivation {
name = "initrd";
builder = ./make-initrd.sh;
buildInputs = [cpio];
inherit init;
# For obtaining the closure of `init'.
exportReferencesGraph = ["init-closure" init];
pathsFromGraph = ./paths-from-graph.sh;
}