93 lines
4.3 KiB
Nix
93 lines
4.3 KiB
Nix
let
|
|
# Some metadata on various compression programs, relevant to naming
|
|
# the initramfs file and, if applicable, generating a u-boot image
|
|
# from it.
|
|
compressors = import ./initrd-compressor-meta.nix;
|
|
# Get the basename of the actual compression program from the whole
|
|
# compression command, for the purpose of guessing the u-boot
|
|
# compression type and filename extension.
|
|
compressorName = fullCommand: builtins.elemAt (builtins.match "([^ ]*/)?([^ ]+).*" fullCommand) 1;
|
|
in
|
|
{ stdenvNoCC, perl, cpio, ubootTools, lib, pkgsBuildHost, makeInitrdNGTool, patchelf, runCommand
|
|
# Name of the derivation (not of the resulting file!)
|
|
, name ? "initrd"
|
|
|
|
# Program used to compress the cpio archive; use "cat" for no compression.
|
|
# This can also be a function which takes a package set and returns the path to the compressor,
|
|
# such as `pkgs: "${pkgs.lzop}/bin/lzop"`.
|
|
, compressor ? "gzip"
|
|
, _compressorFunction ?
|
|
if lib.isFunction compressor then compressor
|
|
else if ! builtins.hasContext compressor && builtins.hasAttr compressor compressors then compressors.${compressor}.executable
|
|
else _: compressor
|
|
, _compressorExecutable ? _compressorFunction pkgsBuildHost
|
|
, _compressorName ? compressorName _compressorExecutable
|
|
, _compressorMeta ? compressors.${_compressorName} or {}
|
|
|
|
# List of arguments to pass to the compressor program, or null to use its defaults
|
|
, compressorArgs ? null
|
|
, _compressorArgsReal ? if compressorArgs == null then _compressorMeta.defaultArgs or [] else compressorArgs
|
|
|
|
# Filename extension to use for the compressed initramfs. This is
|
|
# included for clarity, but $out/initrd will always be a symlink to
|
|
# the final image.
|
|
# If this isn't guessed, you may want to complete the metadata above and send a PR :)
|
|
, extension ? _compressorMeta.extension or
|
|
(throw "Unrecognised compressor ${_compressorName}, please specify filename extension")
|
|
|
|
# List of { object = path_or_derivation; symlink = "/path"; }
|
|
# The paths are copied into the initramfs in their nix store path
|
|
# form, then linked at the root according to `symlink`.
|
|
, contents
|
|
|
|
# List of uncompressed cpio files to prepend to the initramfs. This
|
|
# can be used to add files in specified paths without them becoming
|
|
# symlinks to store paths.
|
|
, prepend ? []
|
|
|
|
# Whether to wrap the initramfs in a u-boot image.
|
|
, makeUInitrd ? stdenvNoCC.hostPlatform.linux-kernel.target == "uImage"
|
|
|
|
# If generating a u-boot image, the architecture to use. The default
|
|
# guess may not align with u-boot's nomenclature correctly, so it can
|
|
# be overridden.
|
|
# See https://gitlab.denx.de/u-boot/u-boot/-/blob/9bfb567e5f1bfe7de8eb41f8c6d00f49d2b9a426/common/image.c#L81-106 for a list.
|
|
, uInitrdArch ? stdenvNoCC.hostPlatform.linuxArch
|
|
|
|
# The name of the compression, as recognised by u-boot.
|
|
# See https://gitlab.denx.de/u-boot/u-boot/-/blob/9bfb567e5f1bfe7de8eb41f8c6d00f49d2b9a426/common/image.c#L195-204 for a list.
|
|
# If this isn't guessed, you may want to complete the metadata above and send a PR :)
|
|
, uInitrdCompression ? _compressorMeta.ubootName or
|
|
(throw "Unrecognised compressor ${_compressorName}, please specify uInitrdCompression")
|
|
}: runCommand name {
|
|
compress = "${_compressorExecutable} ${lib.escapeShellArgs _compressorArgsReal}";
|
|
passthru = {
|
|
compressorExecutableFunction = _compressorFunction;
|
|
compressorArgs = _compressorArgsReal;
|
|
};
|
|
|
|
inherit extension makeUInitrd uInitrdArch prepend;
|
|
${if makeUInitrd then "uInitrdCompression" else null} = uInitrdCompression;
|
|
|
|
passAsFile = ["contents"];
|
|
contents = lib.concatMapStringsSep "\n" ({ object, symlink, ... }: "${object}\n${if symlink == null then "" else symlink}") contents + "\n";
|
|
|
|
nativeBuildInputs = [makeInitrdNGTool patchelf cpio] ++ lib.optional makeUInitrd ubootTools;
|
|
} ''
|
|
mkdir ./root
|
|
make-initrd-ng "$contentsPath" ./root
|
|
mkdir "$out"
|
|
(cd root && find * .[^.*] -exec touch -h -d '@1' '{}' +)
|
|
for PREP in $prepend; do
|
|
cat $PREP >> $out/initrd
|
|
done
|
|
(cd root && find * .[^.*] -print0 | sort -z | cpio -o -H newc -R +0:+0 --reproducible --null | eval -- $compress >> "$out/initrd")
|
|
|
|
if [ -n "$makeUInitrd" ]; then
|
|
mkimage -A "$uInitrdArch" -O linux -T ramdisk -C "$uInitrdCompression" -d "$out/initrd" $out/initrd.img
|
|
# Compatibility symlink
|
|
ln -sf "initrd.img" "$out/initrd"
|
|
else
|
|
ln -s "initrd" "$out/initrd$extension"
|
|
fi
|
|
''
|