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Overriding package sources

Take a package from nixpkgs and roll it back to a previous version.

  1. Change the source
  2. Figure out the build hash
  3. Fix compilation problems that come up (if any)

Example: eagle 9.6.2 -> 9.5.0


with import <nixpkgs> {
  config.allowUnfree = true;
};
eagle.overrideAttrs ({ src, version, ... }: {
  version = "9.5.0";
  src =
    let
      url = builtins.replaceStrings ["9.6.2" "9_6_2"] ["9.5.0" "9_5_0"] src.url;
    in
      pkgs.fetchurl {
        inherit url;
        sha256 = lib.fakeSha256;
      };
})

these 2 derivations will be built:
  /nix/store/3904kh32s3v70xp8wzz0z2ggda16jxy4-Autodesk_EAGLE_9.5.0_English_Linux_64bit.tar.gz.drv
  /nix/store/3zayjzjjrjwnp0lpw82v27k66sv1r115-eagle-9.5.0.drv
building '/nix/store/3904kh32s3v70xp8wzz0z2ggda16jxy4-Autodesk_EAGLE_9.5.0_English_Linux_64bit.tar.gz.drv'...

trying https://eagle-updates.circuits.io/downloads/9_5_0/Autodesk_EAGLE_9.5.0_English_Linux_64bit.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  162M  100  162M    0     0  1997k      0  0:01:23  0:01:23 --:--:-- 4547k
error: hash mismatch in fixed-output derivation '/nix/store/3904kh32s3v70xp8wzz0z2ggda16jxy4-Autodesk_EAGLE_9.5.0_English_Linux_64bit.tar.gz.drv':
         specified: sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
            got:    sha256-HmdkMZInYiqeWqRb2IO2pAgQUyKnoXA7e21WlJRUU3E=
error: 1 dependencies of derivation '/nix/store/3zayjzjjrjwnp0lpw82v27k66sv1r115-eagle-9.5.0.drv' failed to build

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