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nixpkgs/nixos/lib/make-squashfs.nix

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{ stdenv, squashfsTools, closureInfo
, # The root directory of the squashfs filesystem is filled with the
# closures of the Nix store paths listed here.
storeContents ? []
, # Compression parameters.
# For zstd compression you can use "zstd -Xcompression-level 6".
comp ? "xz -Xdict-size 100%"
}:
stdenv.mkDerivation {
name = "squashfs.img";
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
# Generate the squashfs image.
mksquashfs nix-path-registration $(cat $closureInfo/store-paths) $out \
-keep-as-directory -all-root -b 1048576 -comp ${comp}
'';
}