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|
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,
cpio,
ubootTools,
lib,
pkgsBuildHost,
makeInitrdNGTool,
binutils,
# 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 { source = path_or_derivation; target = "/path"; }
# The paths are copied into the initramfs in their nix store path
# form, then linked at the root according to `target`.
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.ubootArch,
# 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"),
}:
stdenvNoCC.mkDerivation (finalAttrs: {
__structuredAttrs = true;
# the initrd will be self-contained so we can drop references
# to the closure that was used to build it
unsafeDiscardReferences.out = true;
inherit
name
extension
makeUInitrd
uInitrdArch
prepend
;
${if makeUInitrd then "uInitrdCompression" else null} = uInitrdCompression;
compress = "${_compressorExecutable} ${lib.escapeShellArgs _compressorArgsReal}";
contentsJSON = builtins.toJSON contents;
nativeBuildInputs = [
makeInitrdNGTool
cpio
]
++ lib.optional makeUInitrd ubootTools;
buildCommand = ''
mkdir -p ./root/{run,tmp,var/empty}
ln -s ../run ./root/var/run
make-initrd-ng <(echo "$contentsJSON") ./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 --quiet -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
'';
passthru = {
compressorExecutableFunction = _compressorFunction;
compressorArgs = _compressorArgsReal;
};
})
|
