nix: don't inject invoke/bumpversion in default shell, we use our own py3 compat, and want to have an option to skip it

shell.nix

@@ -1,117 +1,119 b''
 # This file contains the adjustments which are desired for a development
 # environment.
 
 { pkgs ? (import <nixpkgs> {})
 , pythonPackages ? "python27Packages"
 , doCheck ? false
 , sourcesOverrides ? {}
 , doDevelopInstall ? true
+, doReleaseInstall ? false
 }:
 
 let
   # Get sources from config and update them with overrides.
   sources = (pkgs.config.rc.sources or {}) // sourcesOverrides;
 
   enterprise-ce = import ./default.nix {
     inherit
       pythonPackages
       doCheck;
   };
 
   ce-pythonPackages = enterprise-ce.pythonPackages;
 
   # This method looks up a path from `pkgs.config.rc.sources` and returns a
   # shell script which does a `python setup.py develop` installation of it. If
   # no path is found it will return an empty string.
   optionalDevelopInstall = attributeName:
     let
       path = pkgs.lib.attrByPath [attributeName] null sources;
       doIt = doDevelopInstall && path != null;
 
     in
       # do develop installation with empty hosts to skip any package duplicates to
       # be replaced. This only pushes the package to be locally available
       pkgs.lib.optionalString doIt (''
         echo "[BEGIN] Develop install of '${attributeName}' from '${path}'"
         pushd ${path}
         python setup.py develop --prefix $tmp_path --allow-hosts ""
         popd
         echo "[DONE] Develop install of '${attributeName}' from '${path}'"
         echo ""
       '');
 
   # This method looks up a path from `pkgs.config.rc.sources` and imports the
   # default.nix file if it exists. It returns the list of build inputs. If no
   # path is found it will return an empty list.
   optionalDevelopInstallBuildInputs = attributeName:
     let
       path = pkgs.lib.attrByPath [attributeName] null sources;
       doIt = doDevelopInstall && path != null && pkgs.lib.pathExists "${nixFile}";
       nixFile = "${path}/default.nix";
 
       derivate = import "${nixFile}" {
         inherit
           doCheck
           pythonPackages;
       };
     in
       pkgs.lib.lists.optionals doIt (
         derivate.propagatedBuildInputs
       );
 
   developInstalls = [ "rhodecode-vcsserver" ];
 
 in enterprise-ce.override (attrs: {
   # Avoid that we dump any sources into the store when entering the shell and
   # make development a little bit more convenient.
   src = null;
 
   # Add dependencies which are useful for the development environment.
   buildInputs =
     attrs.buildInputs ++
-    (with ce-pythonPackages; [
-      bumpversion
-      invoke
-      ipdb
-    ]);
+    (with ce-pythonPackages;
+      [ ipdb ]
+      ++ pkgs.lib.lists.optionals doReleaseInstall (
+        [invoke bumpversion]
+      )
+    );
 
   # place to inject some required libs from develop installs
   propagatedBuildInputs =
     attrs.propagatedBuildInputs ++
     pkgs.lib.lists.concatMap optionalDevelopInstallBuildInputs developInstalls;
 
 
   # Make sure we execute both hooks
   shellHook = ''
     runHook preShellHook
     runHook postShellHook
   '';
 
   preShellHook = ''
     echo "Entering CE-Shell"
 
     # Custom prompt to distinguish from other dev envs.
     export PS1="\n\[\033[1;32m\][CE-shell:\w]$\[\033[0m\] "
 
     echo "Building frontend assets"
     ${enterprise-ce.linkNodePackages}
 
     # 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 installation
     echo "[BEGIN]: develop install of rhodecode-enterprise-ce"
     python setup.py develop --prefix $tmp_path --allow-hosts ""
   '';
 
   postShellHook = ''
     echo "** Additional develop installs **"
     '' +
     pkgs.lib.strings.concatMapStrings optionalDevelopInstall developInstalls
     + ''
   '';
 
 })