How to copy files from directories in a derivation so that they can overwrite each other?

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1

I am trying to package the Catppuccin theme for Steam. The instructions for installing the theme involve copying files from multiple sources into the same directory in a certain order so that files with the same name get overwritten.

Edit: Also I should mention there are enough individual files in the theme to worry about to make manually copying over each one I need infeasible.

However, I cannot figure out how to do this in a package.
I tried symlinkJoin, but it did not work because one of the source directories to copy from has spaces in its name.

Whenever I try to copy it as part of installPhase, I just get a bunch of errors like:

cp: cannot remove '/nix/store/yr3ci2m0f89920dd84ps004p61rkharw-catppucin-steam-theme/catppuccin-mocha/steam/cached/uninstallgamesdialog.res': Permission denied

Here is what I have so far:

{ stdenvNoCC
, fetchFromGitHub
, ...
}:

stdenvNoCC.mkDerivation {
  name = "catppucin-steam-theme";

  src = fetchFromGitHub {
    owner = "catppuccin";
    repo = "steam";
    rev = "7ea14ee1c40dcdba4cb6780c96a74c46e980e3ea";
    hash = "sha256-XFoYxzYncQqgs+oDn80S1ZEJCv61+wtZ0968Ga8lajg=";
  };

  metro = fetchFromGitHub {
    owner = "minischetti";
    repo = "metro-for-steam";
    rev = "v4.4";
    hash = "sha256-E/hmOODf/aBAcc/RYueqMjQ+7SuvftfjYCVKD6CTX+U=";
  };

  metroPatch = fetchFromGitHub {
    owner = "redsigma";
    repo = "UPMetroSkin";
    rev = "9.1.47";
    hash = "sha256-Fdvvpt+5z/wADcn9Iop/+puJ6VoEBbT7xL7K2eHq5ag=";
  };

  installPhase =
    let
      flavour = "mocha";
      themeFolder = "$out/catppuccin-${flavour}";
    in
    ''
      runHook preInstall

      mkdir -p ${themeFolder}
      cp -r $metro/* ${themeFolder}        
      cp -rf "$metroPatch/Unofficial 4.x Patch/Main Files [Install First]"/* ${themeFolder}
      cp -rf $src/themes/${flavour}/* ${themeFolder}

      runHook postInstall
    '';
}
2

Never mind, the theme was broken by Steam’s UI update a while ago so I can’t use it anyways.

Of course, I would still accept an answer to my post’s question if anyone has one because I’m sure it’ll be useful information to someone at some point.

3

Files and directories in the Nix store are read-only, and your copies are inheriting those mode bits, preventing you from writing to them.

The obvious ways I can think of to leave yourself with write bits are chmod -R +w between each layer, or cp --no-preserve=mode when copying.

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