Comment 7 for bug 348640

> I think there's an XDG convention for how the environment variable
> should be named; we should use that.

I'm pretty sure the original requester is asking for a way to override the *entire* directory name - i.e. $NOTIONAL_NEW_ENV_VAR/{bazaar.conf,plugins/,locations.conf,...}

As far as I know, XDG only operates at the level of defining conventions for trees, within which apps reserve particular paths - not envvar conventions for envvars private to specific apps?