I'm trying to configure global proxy settings for the rhc system role tests so that they work in Testing Farm.  I am doing this by adding

export http_proxy=http://squid....
export https_proxy=http://squid....

to /root/.bashrc, and adding

[Service]
Environment=http_proxy=http://squid....
Environment=https_proxy=http://squid....

to /etc/systemd/system/rhsm.service.d/proxy.conf

This makes everything work EXCEPT when the subman client uses dbus to connect to rhsm.service.  I think the problem is here: https://github.com/candlepin/subscription-manager/blame/main/src/rhsm/connection.py#L250

For some reason, the proxy_hostname et. al. parameters from the client are passed as the empty string "" instead of None, and the condition expects only the value of None to mean "parameter not passed from client".  I think the condition should be `if proxy_hostname:` instead.

The problem is that I will need to change every rhc system role test to optionally add the "rhc_proxy" parameters if a global proxy is specified.  This is a lot of work that I would like to avoid. Unfortunately, since this fix is unlikely to be backported to every platform the rhc role supports, I will need to find some workaround regardless.