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, ubootChooser, compressor, prepend
16, hostPlatform
17}:
18
19let
20 inputsFun = ubootName : [ perl cpio ]
21 ++ stdenv.lib.optional (ubootName != null) [ (ubootChooser ubootName) ];
22 makeUInitrdFun = ubootName : (ubootName != null);
23in
24stdenv.mkDerivation {
25 name = "initrd";
26 builder = ./make-initrd.sh;
27 nativeBuildInputs = inputsFun hostPlatform.platform.uboot;
28
29 makeUInitrd = makeUInitrdFun hostPlatform.platform.uboot;
30
31 # !!! should use XML.
32 objects = map (x: x.object) contents;
33 symlinks = map (x: x.symlink) contents;
34 suffices = map (x: if x ? suffix then x.suffix else "none") contents;
35
36 # For obtaining the closure of `contents'.
37 exportReferencesGraph =
38 map (x: [("closure-" + baseNameOf x.symlink) x.object]) contents;
39 pathsFromGraph = ./paths-from-graph.pl;
40
41 inherit compressor prepend;
42}