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5a8147479e
To achieve reproducible results, `cpio` archive members are added in sorted order and inodes renumbered. The `cpio-clean.pl` script is made obsolete by setting mtimes via `touch` & using `cpio --reproducible`. Suggested by @dezgeg in https://github.com/NixOS/nixpkgs/pull/21273#issuecomment-268116605. Note that using `--reproducible` means that initial ramdisk creation now requires at least `cpio` version 2.12 (released in 2015).
45 lines
1.6 KiB
Nix
45 lines
1.6 KiB
Nix
# Create an initial ramdisk containing the closure of the specified
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# file system objects. An initial ramdisk is used during the initial
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# stages of booting a Linux system. It is loaded by the boot loader
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# along with the kernel image. It's supposed to contain everything
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# (such as kernel modules) necessary to allow us to mount the root
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# file system. Once the root file system is mounted, the `real' boot
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# script can be called.
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#
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# An initrd is really just a gzipped cpio archive.
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#
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# Symlinks are created for each top-level file system object. E.g.,
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# `contents = {object = ...; symlink = /init;}' is a typical
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# argument.
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{ stdenv, perl, cpio, contents, ubootChooser, compressor, prepend }:
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let
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inputsFun = ubootName : [ perl cpio ]
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++ stdenv.lib.optional (ubootName != null) [ (ubootChooser ubootName) ];
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makeUInitrdFun = ubootName : (ubootName != null);
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in
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stdenv.mkDerivation {
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name = "initrd";
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builder = ./make-initrd.sh;
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nativeBuildInputs = inputsFun stdenv.platform.uboot;
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makeUInitrd = makeUInitrdFun stdenv.platform.uboot;
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# !!! should use XML.
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objects = map (x: x.object) contents;
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symlinks = map (x: x.symlink) contents;
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suffices = map (x: if x ? suffix then x.suffix else "none") contents;
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# For obtaining the closure of `contents'.
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exportReferencesGraph =
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map (x: [("closure-" + baseNameOf x.symlink) x.object]) contents;
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pathsFromGraph = ./paths-from-graph.pl;
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crossAttrs = {
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nativeBuildInputs = inputsFun stdenv.cross.platform.uboot;
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makeUInitrd = makeUInitrdFun stdenv.cross.platform.uboot;
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};
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inherit compressor prepend;
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}
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