pyrox.dev
1# Create an initial ramdisk containing the closure of the specified
2# file system objects. An initial ramdisk is used during the initial
3# stages of booting a Linux system. It is loaded by the boot loader
4# along with the kernel image. It's supposed to contain everything
5# (such as kernel modules) necessary to allow us to mount the root
6# file system. Once the root file system is mounted, the `real' boot
7# script can be called.
8#
9# An initrd is really just a gzipped cpio archive.
10#
11# Symlinks are created for each top-level file system object. E.g.,
12# `contents = {object = ...; symlink = /init;}' is a typical
13# argument.
14
15{ stdenv, perl, cpio, contents, compressor, prepend, ubootTools
16}:
17
18stdenv.mkDerivation rec {
19 name = "initrd";
20 builder = ./make-initrd.sh;
21
22 makeUInitrd = stdenv.hostPlatform.platform.kernelTarget == "uImage";
23
24 nativeBuildInputs = [ perl cpio ]
25 ++ stdenv.lib.optional makeUInitrd ubootTools;
26
27 # !!! should use XML.
28 objects = map (x: x.object) contents;
29 symlinks = map (x: x.symlink) contents;
30 suffices = map (x: if x ? suffix then x.suffix else "none") contents;
31
32 # For obtaining the closure of `contents'.
33 # Note: we don't use closureInfo yet, as that won't build with nix-1.x.
34 # See #36268.
35 exportReferencesGraph =
36 map (x: [("closure-" + baseNameOf x.symlink) x.object]) contents;
37 pathsFromGraph = ./paths-from-graph.pl;
38
39 inherit compressor prepend;
40}