98 lines
4.3 KiB
Nix
98 lines
4.3 KiB
Nix
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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, cpio, ubootTools, lib, pkgsBuildHost, makeInitrdNGTool, binutils, runCommand
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# Name of the derivation (not of the resulting file!)
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, name ? "initrd"
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, strip ? true
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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 { source = path_or_derivation; target = "/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 `target`.
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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.ubootArch
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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 = builtins.toJSON contents;
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nativeBuildInputs = [makeInitrdNGTool cpio] ++ lib.optional makeUInitrd ubootTools ++ lib.optional strip binutils;
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STRIP = if strip then "${pkgsBuildHost.binutils.targetPrefix}strip" else null;
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}) ''
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mkdir -p ./root/var/empty
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make-initrd-ng "$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 --quiet -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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