python3Packages.python-openstackclient: enable bash completion

pkgs/development/python-modules/python-openstackclient/default.nix

@@ -3,6 +3,7 @@
   buildPythonPackage,
   fetchFromGitHub,
   ddt,
+  installShellFiles,
   openstackdocstheme,
   osc-lib,
   osc-placement,
@@ -27,6 +28,7 @@
   setuptools,
   sphinxHook,
   sphinxcontrib-apidoc,
+  stdenv,
   stestrCheckHook,
   versionCheckHook,
 }:
@@ -68,6 +70,10 @@ buildPythonPackage (finalAttrs: {
   # to support proxy envs like ALL_PROXY in requests
   ++ requests.optional-dependencies.socks;
 
+  nativeBuildInputs = [
+    installShellFiles
+  ];
+
   nativeCheckInputs = [
     ddt
     requests-mock
@@ -116,6 +122,11 @@ buildPythonPackage (finalAttrs: {
   ];
   doInstallCheck = true;
 
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    installShellCompletion --cmd openstack \
+      --bash <($out/bin/openstack complete)
+  '';
+
   meta = {
     description = "OpenStack Command-line Client";
     mainProgram = "openstack";