Merge pull request #28 from PrivateStorageio/27.nix-openssl111c

OpenSSL 1.1.1c for Nix env

Fixes: #27 

default.nix

-{ pkgs ? import <nixpkgs> { overlays = [ (import ./overlays.nix) ]; } }:
+{ pkgs ? import ./nixpkgs.nix { } }:
 pkgs.python27Packages.callPackage ./zkapauthorizer.nix { }

nixpkgs.nix

+{ pkgs ? import <nixpkgs> { } }:
+let
+  nixpkgs = fetchTarball
+  { url = "https://github.com/NixOS/nixpkgs-channels/archive/4557b9f1f50aa813ae673fe6fcd30ca872968947.tar.gz";
+    sha256 = "0cam48cn042axcik9vqxsqjc2hwyb2grjbjxacsn4w0y1zk6k6l2";
+  };
+  args =
+  { overlays = [ (import ./overlays.nix) ];
+  };
+in
+pkgs.callPackage nixpkgs args

overlays.nix

 self: super: {
+  openssl = self.openssl_1_1;
+
   python27 = super.python27.override {
     packageOverrides = python-self: python-super: {
       # new tahoe-lafs dependency

shell.nix

-{ pkgs ? import <nixpkgs> { overlays = [ (import ./overlays.nix) ]; } }:
+{ pkgs ? import ./nixpkgs.nix { } }:
 let
   zkapauthorizer = pkgs.callPackage ./default.nix { };
 in