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nixpkgs/nixos/lib/make-squashfs.nix
Lluís Batlle i Rossell 897b10998b Tune mksquashfs for smaller isos.
Bigger block size, more suitable for xz.
2016-12-28 16:07:16 +01:00

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Nix

{ stdenv, squashfsTools, perl, pathsFromGraph
, # The root directory of the squashfs filesystem is filled with the
# closures of the Nix store paths listed here.
storeContents ? []
}:
stdenv.mkDerivation {
name = "squashfs.img";
buildInputs = [perl squashfsTools];
# For obtaining the closure of `storeContents'.
exportReferencesGraph =
map (x: [("closure-" + baseNameOf x) x]) storeContents;
buildCommand =
''
# Add the closures of the top-level store objects.
storePaths=$(perl ${pathsFromGraph} closure-*)
# Also include a manifest of the closures in a format suitable
# for nix-store --load-db.
printRegistration=1 perl ${pathsFromGraph} closure-* > nix-path-registration
# Generate the squashfs image.
mksquashfs nix-path-registration $storePaths $out \
-keep-as-directory -all-root -b 1048576 -comp xz -Xdict-size 100%
'';
}