- only printing the scan list is not gonna cut it. It's usually stale,
and we need to request a new scan.
- don't hard-code the GEnum and GFlags values that we understand. We
have libnm, which provides us some meta information about the data.
Use it.
- Some code cleanup.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1531
Add a fire-and-forget function to wait for shutdown to be complete.
It's not entirely trivial to ensure all resources of NMClient are
cleaned up. That matters only if NMClient uses a temporary GMainContext
that the user wants to release while the application continues. For
example, to do some short-lived operations an a worker thread. It's
not trivial also because glib provides no convenient API to integrate
a GMainContext in another GMainContext. We have that code as
nm_utils_g_main_context_create_integrate_source(), so add a helper
function to allow the user to do this.
The function allows to omit the callback, in which case the caller
wouldn't know when shutdown is complete. That would still be useful
however, when integrating the client's context into the caller's
context, so that the client's context gets automatically iterated
until completion.
The following test script will run out of file descriptors,
when wait_shutdown() is not used:
#!/bin/python
import gi
gi.require_version("NM", "1.0")
from gi.repository import NM, GLib
for i in range(1200):
print(f">>>{i}")
ctx = GLib.MainContext()
ctx.push_thread_default()
nmc = NM.Client.new()
ctx.pop_thread_default()
def cb(unused, result, i):
try:
NM.Client.wait_shutdown_finish(result)
except Exception:
# cannot happen
assert False
else:
print(f">>>>> {i} complete")
nmc.wait_shutdown(True, None, cb, i)
while GLib.MainContext.default().iteration(False):
pass
While iterating the context (once), multiple sources can be dispatched.
So if we get a timeout and shortly after the weak-ref callback, then
we still need to honor the weak-ref.
In particular, because weak_ref.unref() is not safe to do after
the object was already destroyed. So we need to be correct about
tracking destruction.
"examples/python/gi/checkpoint.py" is not only an example. It's also a
useful script for testing checkpoints.
Support a "--last" argument to specify the last checkpoint created.
Otherwise, when you are using this example from a test script, it
can be cumbersome to find the right checkpoint point.
Also, rename "client" and "nm_client" variables to "nmc". The purpose of
using the same variable name for the same thing is readability, but also
it works better when copy+paste snippets into the Python REPL.
The previous implementation did some ratelimiting, namely how many parallel
ActivateConnection D-Bus calls are in fly. This way we are able to kick off
many parallel calls, but the activations themselves were not ratelimited.
Rework the code. Now there are two rate limits (that can be set via environment
variables):
NUM_PARALLEL_STARTING
NUM_PARALLEL_IN_PROGRESS
This allows more control about how much is happening in parallel. If we are
going to activate 1000 profiles, then it matters that we do things in parallel,
but not everything at the same time.
It's an example for how to use libnm and asynchronous API.
But it's also a script I will use to test activating many
profiles in parallel.
Also add a test script that creates many veth interfaces and connection
profiles. So now you can do:
sudo NUM_DEVS=100 contrib/scripts/test-create-many-device-setup.sh setup
./examples/python/gi/nm-up-many.py c-a{1..100}
and cleanup with
nmcli connection down c-a{1..100}
sudo contrib/scripts/test-create-many-device-setup.sh cleanup
Of course, be careful to do this on your production machine.
First of all, the "os.setuid()" call is never reached. lgtm.com warns about
that, and warnings are annoying because they require investigation.
This code is only in the example, so that the user would understand that
they should edit the source and set the desired UID. But you can only
call setuid() if you have CAP_SETUID, so commonly this anyway doesn't
work -- unless you are root already, and then you actually don't need
it either.
Let's drop this code from the example.
Maybe this example really should be dropped. Does the "dbus" python
module even still work? Doesn't for me...
input() in Python2 evaluated the string and was thus unsafe. On
Python2, the right choice is raw_input. In Python3, input does
what raw_input did.
Work around this.
The main "problem" is that lgtm.com flags this as error. The fix
in the example is not important, but getting a low number of warnings
is.
Fedora 33's version of python-black is the authoritative version we
use for formatting -- note that formatting may look different depending
on the black version.
Recently, the package was updated to 20.8~b1-1.fc33, which treats
these lines different.
Work around that by adjusting the code so that both older and current
versions of python black behave the same.
The python example is (also) used to test the feature. That is because
currently nmcli does not yet have support for ovs.external-ids and this
API is only accessible via D-Bus (or a tool like this example).
And example script for getting and setting OVS external-ids.
Since currently there is no nmcli support for these properties yet,
the script becomes more interesting.
This "example" is rather long, and it showcases less the usage of
libnm (which is rather trivial, with respect to configuring
NMSettingOvsExternalIDs). Instead, it aims to provide a useful
command line tool for debugging. Hence, it's mostly concerned with
an elaborate command line syntax and useful print output.
