new approach 2

new2/default.nix

@@ -5,8 +5,9 @@
 ## 1. Import a list of available software packages.
 ## 2. Pick a list of specific packages.
 
-{
-  system ? builtins.currentSystem,
+{ pkgs ? import <nixpkgs> {
+    inherit system;
+  }, system ? builtins.currentSystem
 }:
 
 ################################################################################
@@ -35,30 +36,8 @@ let
   ## Observe: The notation `import (...url...) {...options...}` accepts a list of options.
   ## This can be useful if you need custom compilation options for some packages.
 
-  pkgs = import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.09.tar.gz) {
-    inherit system;
-  };
-
-  ####
-  ## Import an older version of the standard package repository (nixpkgs v18.03). Assign it the name "oldPkgs".
-  ##
-  ## Observe: PHP 5.6 and PHP 7.0 are no longer distributed in nixpkgs
-  ## v18.09+.  But you can still get them from nixpkgs v18.03.
-  ##
-  ## Observe: This is not commonly done in the official "nixpkgs", but it's
-  ## handy if you need to mix+match different versions.
-  ##
-  ## Observe: Older builds used libmysqlclient instead of mysqlnd.  That can
-  ## be problematic with, e.g., Drush+Drupal 8. So we set some custom build
-  ## options.
-
-  oldPkgs = import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.03.tar.gz) {
+  pkgs = import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-20.03.tar.gz) {
     inherit system;
-    config = {
-      php = {
-        mysqlnd = false;
-      };
-    };
   };
 
   ####
@@ -72,15 +51,14 @@ let
   ## By default, we download a specific version of loco.  But if you had a
   ## local codebase for development purposes, you could use that instead.
 
-  loco = callPackage (fetchTarball https://github.com/totten/loco/archive/v0.2.1.tar.gz) {};
-  # loco = callPackage /home/myuser/src/loco { inherit pkgs; };
-
-  ramdisk = callPackage (fetchTarball https://github.com/totten/ramdisk/archive/5c699fbeb8ce3d8f3862a726e1e2684067b237dd.tar.gz) {};
+  ramdisk = callPackage (fetchTarball https://github.com/totten/ramdisk/archive/master.tar.gz) {};
 
   ## Generating php.ini requires some special work.
   phpExtLoader = extSpec: (callPackage ./.loco/pkgs/php-exts/default.nix ({ inherit pkgs; } // extSpec));
 
-################################################################################
+  sd-core = callPackage (fetchTarball https://git.law/newroco/searchanddisplace-core/archive/master.tar.gz) {};
+
+  ################################################################################
 ## Now, we have a list of available software packages.
 ## Let's define the "locolamp" project and include some specific dependencies.
 
@@ -106,7 +84,6 @@ in [
   # pkgs.mailcatcher
 
   ## CLI utilities
-  loco
   pkgs.bzip2
   pkgs.curl
   pkgs.git
@@ -119,6 +96,7 @@ in [
   ##pkgs.unzip
   pkgs.which
   pkgs.zip
+  sd-core
 
   ## Aside: Downloading a different version of PHP or MySQL or NodeJS is
   ## simple, but bear in mind: this is upgrading (or downgrading).  You