nixpkgs/nixos/lib/make-squashfs.nix

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{ lib, stdenv, squashfsTools, closureInfo
, fileName ? "squashfs"
, # The root directory of the squashfs filesystem is filled with the
# closures of the Nix store paths listed here.
storeContents ? []
# Pseudo files to be added to squashfs image
, pseudoFiles ? []
, noStrip ? false
, # Compression parameters.
# For zstd compression you can use "zstd -Xcompression-level 6".
comp ? "xz -Xdict-size 100%"
, # create hydra build product. will put image in directory instead
# of directly in the store
hydraBuildProduct ? false
}:
let
pseudoFilesArgs = lib.concatMapStrings (f: ''-p "${f}" '') pseudoFiles;
compFlag = if comp == null then "-no-compression" else "-comp ${comp}";
in
stdenv.mkDerivation {
name = "${fileName}${lib.optionalString (!hydraBuildProduct) ".img"}";
__structuredAttrs = true;
nativeBuildInputs = [ squashfsTools ];
buildCommand =
''
closureInfo=${closureInfo { rootPaths = storeContents; }}
# Also include a manifest of the closures in a format suitable
# for nix-store --load-db.
cp $closureInfo/registration nix-path-registration
imgPath="$out"
'' + lib.optionalString hydraBuildProduct ''
mkdir $out
imgPath="$out/${fileName}.squashfs"
'' + lib.optionalString stdenv.buildPlatform.is32bit ''
# 64 cores on i686 does not work
# fails with FATAL ERROR: mangle2:: xz compress failed with error code 5
if ((NIX_BUILD_CORES > 48)); then
NIX_BUILD_CORES=48
fi
'' + ''
# Generate the squashfs image.
mksquashfs nix-path-registration $(cat $closureInfo/store-paths) $imgPath ${pseudoFilesArgs} \
-no-hardlinks ${lib.optionalString noStrip "-no-strip"} -keep-as-directory -all-root -b 1048576 ${compFlag} \
-processors $NIX_BUILD_CORES
'' + lib.optionalString hydraBuildProduct ''
mkdir -p $out/nix-support
echo "file squashfs-image $out/${fileName}.squashfs" >> $out/nix-support/hydra-build-products
'';
}