nix: Use vcsserver from config instead of using command line argument.

shell.nix

@@ -1,34 +1,14 b''
 { pkgs ? (import <nixpkgs> {})
-, vcsserverPath ? "./../rhodecode-vcsserver"
-, vcsserverNix ? "shell.nix"
+, pythonPackages ? "python27Packages"
 , doCheck ? true
+, doDevelopInstall ? true
 }:
 
 let
-
-  # Convert vcsserverPath to absolute path.
-  vcsserverAbsPath =
-    if pkgs.lib.strings.hasPrefix "/" vcsserverPath then
-      builtins.toPath "${vcsserverPath}"
-    else
-      builtins.toPath ("${builtins.getEnv "PWD"}/${vcsserverPath}");
-
-  # Import vcsserver if nix file exists, otherwise set it to null.
-  vcsserver =
-    let
-      nixFile = "${vcsserverAbsPath}/${vcsserverNix}";
-    in
-      if pkgs.lib.pathExists "${nixFile}" then
-        builtins.trace
-          "Using local vcsserver from ${nixFile}"
-          import "${nixFile}" {inherit pkgs;}
-      else
-          null;
-
-  hasVcsserver = !isNull vcsserver;
+  sources = pkgs.config.rc.sources or {};
 
   enterprise-ce = import ./default.nix {
-    inherit pkgs doCheck;
+    inherit pkgs pythonPackages doCheck;
   };
 
   ce-pythonPackages = enterprise-ce.pythonPackages;
@@ -73,7 +53,7 b' in enterprise-ce.override (attrs: {'
 
   buildInputs =
     attrs.buildInputs ++
-    pkgs.lib.optionals (hasVcsserver) vcsserver.propagatedNativeBuildInputs ++
+    pkgs.lib.lists.concatMap optionalDevelopInstallBuildInputs developInstalls ++
     (with ce-pythonPackages; [
       bumpversion
       invoke
@@ -83,21 +63,19 b' in enterprise-ce.override (attrs: {'
   # Somewhat snappier setup of the development environment
   # TODO: think of supporting a stable path again, so that multiple shells
   #       can share it.
-  postShellHook = ''
+  preShellHook = enterprise-ce.linkNodeAndBowerPackages + ''
     # Custom prompt to distinguish from other dev envs.
     export PS1="\n\[\033[1;32m\][CE-shell:\w]$\[\033[0m\] "
 
+    # Setup a temporary directory.
     tmp_path=$(mktemp -d)
     export PATH="$tmp_path/bin:$PATH"
     export PYTHONPATH="$tmp_path/${ce-pythonPackages.python.sitePackages}:$PYTHONPATH"
     mkdir -p $tmp_path/${ce-pythonPackages.python.sitePackages}
+
+    # Develop installations
     python setup.py develop --prefix $tmp_path --allow-hosts ""
-    '' + enterprise-ce.linkNodeAndBowerPackages +
-    pkgs.lib.strings.optionalString (hasVcsserver) ''
-      # Setup the vcsserver development egg.
-      pushd ${vcsserverAbsPath}
-      python setup.py develop --prefix $tmp_path --allow-hosts ""
-      popd
-    '';
+    echo "Additional develop installs"
+  '' + pkgs.lib.strings.concatMapStrings optionalDevelopInstall developInstalls;
 
 })