This message is useless for non-interactive use and clobbers over
otherwise very appealing test output.
The callers knows what we're going to listen on, it passed us the file
descriptor.
The base image for the "check-tree" test got bumped to Fedora 39. This
brings a new python-black version (23.7.0 vs. 22.8.0) and requires
reformatting.
Maybe we should stick to 22.8.0, via `pip install`. But it seems better
to just follow the latest black version (the one from current Fedora).
So do the reformatting instead.
https://black.readthedocs.io/en/stable/change_log.html#id38
"test-cloud-meta-mock.py" needs to be mocked, so it only replies
to stuff that we tell it to. Except for the API token, that is
pushed by the client.
We need to be able to tell the mock whether it supports that API
or not. By default it does, but by setting "/.nmtest/providers"
we can limit that.
The DEFAULT_RESOURCE are now grouped by provider. If a path is not
explicitly mocked, we may fallback to the DEFAULT_RESOURCE, but only if
the respective "/.nmtest/providers" is enabled and if /.nmtest/allow-default"
indicates so (which they do by default).
This reworks the cloud metadata mock server in a significant way.
Most importantly this makes it possible for the client to add and
modify the resources for later retrieval using the PUT method.
This allows the test to create the fixture for itself.
The default set of resources is still provided, so that the too remains
useful as a development aid. If that is not desirable, the --empty
parameter might be passed to cause the server to start with no
resources.
"preexec_fn" is not great, because it is not generally safe in multi
threaded code (and we don't know whether the test didn't start other
threads already, like a GDBus worker thread). Well, it probably is safe,
if you only call async signal safe code, but it's not clear what os.dup2()
does under the hood.
Just avoid that. We can pass on the FD directly.
