1256975 - VirtualenvMixin should provide a way to specify requirements via commandline/config

Status: NEW

(Release Engineering :: Applications: MozharnessCore, defect, P5)

Description

[Andrew Halberstadt [:ahal] (PTO Until Apr 3rd)]

Currently various test scripts are hardcoding their requirements, e.g:
https://dxr.mozilla.org/mozilla-central/source/testing/mozharness/scripts/desktop_unittest.py#254

But it's not possible for a particular job or config file to specify a different set of requirements. Which means every job installs every requirement, whether it's needed or not.

The commandline argument for this should be added to 'virtualenv_config_options':
https://dxr.mozilla.org/mozilla-central/source/testing/mozharness/mozharness/base/python.py#45

It would be nice to have support for both requirements files, as well as just standard specificiers like <package-name>.