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b9bf28fd70
This is for compatiblity with the old builder to get compat with uboot support and to prepend microcode updates to the initrd
94 lines
4.3 KiB
Nix
94 lines
4.3 KiB
Nix
let
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# Some metadata on various compression programs, relevant to naming
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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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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, makeInitrdNGTool, patchelf, runCommand, glibc
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# Name of the derivation (not of the resulting file!)
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, name ? "initrd"
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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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# Whether to wrap the initramfs in a u-boot image.
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, makeUInitrd ? stdenvNoCC.hostPlatform.linux-kernel.target == "uImage"
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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.linuxArch
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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 ${_compressorName}, please specify uInitrdCompression")
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}: runCommand name {
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compress = "${_compressorExecutable} ${lib.escapeShellArgs _compressorArgsReal}";
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passthru = {
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compressorExecutableFunction = _compressorFunction;
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compressorArgs = _compressorArgsReal;
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};
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inherit extension makeUInitrd uInitrdArch prepend;
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${if makeUInitrd then "uInitrdCompression" else null} = uInitrdCompression;
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passAsFile = ["contents"];
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contents = lib.concatMapStringsSep "\n" ({ object, symlink, ... }: "${object}\n${if symlink == null then "" else symlink}") contents + "\n";
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nativeBuildInputs = [makeInitrdNGTool patchelf glibc cpio] ++ lib.optional makeUInitrd ubootTools;
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} ''
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mkdir ./root
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make-initrd-ng "$contentsPath" ./root
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mkdir "$out"
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(cd root && find * .[^.*] -exec touch -h -d '@1' '{}' +)
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for PREP in $prepend; do
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cat $PREP >> $out/initrd
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done
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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 "$makeUInitrd" ]; then
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mkimage -A "$uInitrdArch" -O linux -T ramdisk -C "$uInitrdCompression" -d "$out/initrd" $out/initrd.img
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# Compatibility symlink
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ln -sf "initrd.img" "$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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''
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