make-initrd: various improvements
- Generate a link to the initramfs file with an appropriate file extension, guessed based on the compressor by default - Use correct metadata in u-boot images if generated, up to now this was hardcoded to gzip and would silently generate an erroneous image if another compressor was specified - Document all the parameters - Improve cross-building compatibility, by allowing passing either a string as before, or a function taking a package set and returning the path to a compressor in the "compressor" argument of the function. - Support more compression algorithms - Place compressor executable function and arguments in passthru, for reuse when appending initramfses Co-Authored-By: Dominik Xaver Hörl <hoe.dom@gmx.de>
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53
pkgs/build-support/kernel/initrd-compressor-meta.nix
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53
pkgs/build-support/kernel/initrd-compressor-meta.nix
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@ -0,0 +1,53 @@
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rec {
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cat = {
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executable = pkgs: "cat";
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ubootName = "none";
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extension = ".cpio";
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};
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gzip = {
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executable = pkgs: "${pkgs.gzip}/bin/gzip";
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defaultArgs = ["-9n"];
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ubootName = "gzip";
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extension = ".gz";
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};
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bzip2 = {
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executable = pkgs: "${pkgs.bzip2}/bin/bzip2";
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ubootName = "bzip2";
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extension = ".bz2";
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};
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xz = {
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executable = pkgs: "${pkgs.xz}/bin/xz";
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defaultArgs = ["--check=crc32" "--lzma2=dict=512KiB"];
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extension = ".xz";
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};
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lzma = {
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executable = pkgs: "${pkgs.xz}/bin/lzma";
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defaultArgs = ["--check=crc32" "--lzma1=dict=512KiB"];
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ubootName = "lzma";
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extension = ".lzma";
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};
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lz4 = {
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executable = pkgs: "${pkgs.lz4}/bin/lz4";
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defaultArgs = ["-l"];
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ubootName = "lz4";
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extension = ".lz4";
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};
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lzop = {
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executable = pkgs: "${pkgs.lzop}/bin/lzop";
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ubootName = "lzo";
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extension = ".lzo";
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};
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zstd = {
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executable = pkgs: "${pkgs.zstd}/bin/zstd";
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defaultArgs = ["-10"];
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ubootName = "zstd";
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extension = ".zst";
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};
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pigz = gzip // {
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executable = pkgs: "${pkgs.pigz}/bin/pigz";
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};
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pixz = xz // {
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executable = pkgs: "${pkgs.pixz}/bin/pixz";
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defaultArgs = [];
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};
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}
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@ -1,24 +1,74 @@
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# Create an initial ramdisk containing the closure of the specified
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# Create an initramfs 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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# file system objects. An initramfs 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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# 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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# 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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# (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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# file system. Once the root file system is mounted, the `real' boot
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# script can be called.
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# script can be called.
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#
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#
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# An initrd is really just a gzipped cpio archive.
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# An initramfs is a cpio archive, and may be compressed with a number
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#
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# of algorithms.
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# Symlinks are created for each top-level file system object. E.g.,
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let
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# `contents = {object = ...; symlink = /init;}' is a typical
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# Some metadata on various compression programs, relevant to naming
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# argument.
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# the initramfs file and, if applicable, generating a u-boot image
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# from it.
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{ stdenvNoCC, perl, cpio, contents, ubootTools
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compressors = import ./initrd-compressor-meta.nix;
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# Get the basename of the actual compression program from the whole
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# compression command, for the purpose of guessing the u-boot
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# compression type and filename extension.
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compressorName = fullCommand: builtins.elemAt (builtins.match "([^ ]*/)?([^ ]+).*" fullCommand) 1;
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in
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{ stdenvNoCC, perl, cpio, ubootTools, lib, pkgsBuildHost
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# Name of the derivation (not of the resulting file!)
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, name ? "initrd"
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, name ? "initrd"
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, compressor ? "gzip -9n"
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# Program used to compress the cpio archive; use "cat" for no compression.
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# This can also be a function which takes a package set and returns the path to the compressor,
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# such as `pkgs: "${pkgs.lzop}/bin/lzop"`.
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, compressor ? "gzip"
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, _compressorFunction ?
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if lib.isFunction compressor then compressor
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else if ! builtins.hasContext compressor && builtins.hasAttr compressor compressors then compressors.${compressor}.executable
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else _: compressor
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, _compressorExecutable ? _compressorFunction pkgsBuildHost
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, _compressorName ? compressorName _compressorExecutable
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, _compressorMeta ? compressors.${_compressorName} or {}
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# List of arguments to pass to the compressor program, or null to use its defaults
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, compressorArgs ? null
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, _compressorArgsReal ? if compressorArgs == null then _compressorMeta.defaultArgs or [] else compressorArgs
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# Filename extension to use for the compressed initramfs. This is
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# included for clarity, but $out/initrd will always be a symlink to
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# the final image.
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# If this isn't guessed, you may want to complete the metadata above and send a PR :)
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, extension ? _compressorMeta.extension or
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(throw "Unrecognised compressor ${_compressorName}, please specify filename extension")
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# List of { object = path_or_derivation; symlink = "/path"; }
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# The paths are copied into the initramfs in their nix store path
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# form, then linked at the root according to `symlink`.
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, contents
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# List of uncompressed cpio files to prepend to the initramfs. This
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# can be used to add files in specified paths without them becoming
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# symlinks to store paths.
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, prepend ? []
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, prepend ? []
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, lib
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# Whether to wrap the initramfs in a u-boot image.
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, makeUInitrd ? stdenvNoCC.hostPlatform.platform.kernelTarget == "uImage"
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, makeUInitrd ? stdenvNoCC.hostPlatform.platform.kernelTarget == "uImage"
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, uInitrdArch ? stdenvNoCC.hostPlatform.parsed.cpu.family
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# If generating a u-boot image, the architecture to use. The default
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# guess may not align with u-boot's nomenclature correctly, so it can
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# be overridden.
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# See https://gitlab.denx.de/u-boot/u-boot/-/blob/9bfb567e5f1bfe7de8eb41f8c6d00f49d2b9a426/common/image.c#L81-106 for a list.
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, uInitrdArch ? stdenvNoCC.hostPlatform.kernelArch
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# The name of the compression, as recognised by u-boot.
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# See https://gitlab.denx.de/u-boot/u-boot/-/blob/9bfb567e5f1bfe7de8eb41f8c6d00f49d2b9a426/common/image.c#L195-204 for a list.
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# If this isn't guessed, you may want to complete the metadata above and send a PR :)
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, uInitrdCompression ? _compressorMeta.ubootName or
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(throw "Unrecognised compressor ${_compressorName}, please specify uInitrdCompression")
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}:
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}:
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let
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let
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# !!! Move this into a public lib function, it is probably useful for others
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# !!! Move this into a public lib function, it is probably useful for others
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lib.concatStringsSep "-" (filter (x: !(isList x)) (split "[^a-zA-Z0-9_=.?-]+" x));
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lib.concatStringsSep "-" (filter (x: !(isList x)) (split "[^a-zA-Z0-9_=.?-]+" x));
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in stdenvNoCC.mkDerivation rec {
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in stdenvNoCC.mkDerivation rec {
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inherit name makeUInitrd uInitrdArch;
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inherit name makeUInitrd extension uInitrdArch prepend;
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${if makeUInitrd then "uinitrdCompression" else null} = uInitrdCompression;
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builder = ./make-initrd.sh;
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builder = ./make-initrd.sh;
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nativeBuildInputs = [ perl cpio ]
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nativeBuildInputs = [ perl cpio ]
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++ stdenvNoCC.lib.optional makeUInitrd ubootTools;
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++ stdenvNoCC.lib.optional makeUInitrd ubootTools;
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compress = "${_compressorExecutable} ${lib.escapeShellArgs _compressorArgsReal}";
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# Pass the function through, for reuse in append-initrd-secrets. The
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# function is used instead of the string, in order to support
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# cross-compilation (append-initrd-secrets running on a different
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# architecture than what the main initramfs is built on).
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passthru = {
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compressorExecutableFunction = _compressorFunction;
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compressorArgs = _compressorArgsReal;
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};
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# !!! should use XML.
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# !!! should use XML.
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objects = map (x: x.object) contents;
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objects = map (x: x.object) contents;
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symlinks = map (x: x.symlink) contents;
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symlinks = map (x: x.symlink) contents;
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@ -47,6 +110,4 @@ in stdenvNoCC.mkDerivation rec {
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contents
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contents
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(lib.range 0 (lib.length contents - 1));
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(lib.range 0 (lib.length contents - 1));
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pathsFromGraph = ./paths-from-graph.pl;
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pathsFromGraph = ./paths-from-graph.pl;
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inherit compressor prepend;
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}
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}
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cat $PREP >> $out/initrd
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cat $PREP >> $out/initrd
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done
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done
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(cd root && find * .[^.*] -exec touch -h -d '@1' '{}' +)
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(cd root && find * .[^.*] -exec touch -h -d '@1' '{}' +)
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(cd root && find * .[^.*] -print0 | sort -z | cpio -o -H newc -R +0:+0 --reproducible --null | $compressor >> $out/initrd)
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(cd root && find * .[^.*] -print0 | sort -z | cpio -o -H newc -R +0:+0 --reproducible --null | eval -- $compress >> "$out/initrd")
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if [ -n "$makeUInitrd" ]; then
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if [ -n "$makeUInitrd" ]; then
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mv $out/initrd $out/initrd.gz
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mkimage -A $uInitrdArch -O linux -T ramdisk -C "$uInitrdCompression" -d $out/initrd"$extension" $out/initrd.img
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mkimage -A $uInitrdArch -O linux -T ramdisk -C gzip -d $out/initrd.gz $out/initrd
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# Compatibility symlink
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ln -s "initrd.img" "$out/initrd"
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else
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ln -s "initrd" "$out/initrd$extension"
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fi
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fi
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