[Bug 1945661] Re: openstack commands fail with GTK3 error

[David A. Desrosiers]

I've successfully built and tested 5.2.0 (ussuri) and 5.8.0 (yoga)
versions of python3-openstackclient _without_ the `pyperclip==1.5.27`
dependency, and run a full battery of openstack CLI tests, with and
without $DISPLAY being set (ssh -Y <host> vs. not), and all worked
perfectly without incident.

Since the clipboard is managed by the terminal of choice
(iTerm/Terminal/Termius on macOS, PuTTY on Windows, xterm/rxvt/term on
Linux), there is no reason for the _remote_ CLI tools to contain any
clipboard sharing capabilities, such as those provided by `pyperclip`.
Removing this Python dependency is a no-op to the function of the
openstack client tools.

This is an easy, 1-line PR. I'll see if I can push this upstream and
encourage our internal repackaging of the same to mitigate this issue on
Ubuntu.

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https://bugs.launchpad.net/bugs/1945661

Title:
  openstack commands fail with GTK3 error

Status in python-openstackclient package in Ubuntu:
  Confirmed

Bug description:
  Openstack release: Wallaby
  OS: Ubuntu 20.04 server edition
  After installation of python3-openstackclient from apt, while setting up user, roles and project, I executed following command: 
  openstack domain create --description "An Example Domain" example

  Error: 
  Traceback (most recent call last):
    File "/usr/bin/openstack", line 6, in <module>
      from openstackclient.shell import main
    File "/usr/lib/python3/dist-packages/openstackclient/shell.py", line 23, in <module>
      from osc_lib import shell
    File "/usr/lib/python3/dist-packages/osc_lib/shell.py", line 24, in <module>
      from cliff import app
    File "/usr/lib/python3/dist-packages/cliff/app.py", line 22, in <module>
      import cmd2
    File "/usr/lib/python3/dist-packages/cmd2.py", line 585, in <module>
      _ = pyperclip.paste()
    File "/usr/lib/python3/dist-packages/pyperclip/__init__.py", line 667, in lazy_load_stub_paste
      copy, paste = determine_clipboard()
    File "/usr/lib/python3/dist-packages/pyperclip/__init__.py", line 558, in determine_clipboard
      return init_gi_clipboard()
    File "/usr/lib/python3/dist-packages/pyperclip/__init__.py", line 167, in init_gi_clipboard
      gi.require_version('Gtk', '3.0')
    File "/usr/lib/python3/dist-packages/gi/__init__.py", line 129, in require_version
      raise ValueError('Namespace %s not available' % namespace)

  Had to install GTK3 to make openstack commands work but it is taking
  huge time to get a response to the commands. The wait time after
  firing any openstack cli command is around 30 seconds.

  Anybody faced the issue? What is the fix for it if it exists?

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