ansible-test - add proxy support to pip

[chrros95]

Add proxy support to pip

SUMMARY

With this commit the --proxy parameter is added to pip the pip options if the command is install.
The value is sourced from the os environment. As only one proxy can be used by pip the first matching environment variable that exists will be used. Nowadys most sources are transfered vis https so proxies with HTTPS are prefered. As there is no convention weather the variables are lower or upper case - both are checked.

The no_proxy vars are already accepted as pip currently prepares to support a no_proxy option (pypa/pip#5378)

fixes #77304

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

ansible-test (sanity)

[ansibot]

The test ansible-test sanity --test pylint [explain] failed with 1 error:

test/lib/ansible_test/_util/target/setup/requirements.py:193:23: invalid-name: Argument name "isInstall" doesn't conform to snake_case naming style

click here for bot help

[mattclay]

This PR doesn't really address #77304 -- that issue is about lack of proxy support for bootstrapping pip. The current implementation in this PR doesn't support delegation, such as with the --docker or --remote options.

@chrros95 Can you explain more about your use case? Is there a reason you can't use a pip configuration file instead?

[chrros95]

Thanks for the review.

Adding the --proxy option doesn't solve the bootstrapping issue. The issue is solved by the extended allowlist in test/lib/ansible_test/_internal/util.py. With this extension *_proxy vars are not filtered and urllib can detect a proxy to download the get-pip file.

I have added a commit so that the *_proxy vars are passed to the containers. For the --remote option. For the --remote option I don't have a clue what to change and what might be useful. The system might be in a different location and needs to use a different/no proxy. Furthermore, the sys admin should be able to provide the *_proxy vars on its own.

My project run inside a docker container which is regularly destroyed and where I'm not allowed to modify any startup parameters. To avoid a regular manual creation of the pip configuration file, I would appreciate it if it works out "of the box".

[Akasurde]

cc @mattclay