cannot marshal None unless allow_none is enabled

[Bost]

$ pwclient list -w Licht
Traceback (most recent call last):
  File "/gnu/store/8z3z6p6rl6i8z7s96m18a251rfkdz4il-pwclient-2.6.0/bin/.pwclient-real", line 10, in <module>
    sys.exit(main())
  File "/gnu/store/8z3z6p6rl6i8z7s96m18a251rfkdz4il-pwclient-2.6.0/lib/python3.10/site-packages/pwclient/shell.py", line 140, in main
    patches.action_list(
  File "/gnu/store/8z3z6p6rl6i8z7s96m18a251rfkdz4il-pwclient-2.6.0/lib/python3.10/site-packages/pwclient/patches.py", line 91, in action_list
    patches = api.patch_list(**filters)
  File "/gnu/store/8z3z6p6rl6i8z7s96m18a251rfkdz4il-pwclient-2.6.0/lib/python3.10/site-packages/pwclient/api.py", line 300, in patch_list
    patches += self._client.patch_list(filters)
  File "/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/xmlrpc/client.py", line 1122, in __call__
    return self.__send(self.__name, args)
  File "/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/xmlrpc/client.py", line 1464, in __request
    response = self.__transport.request(
  File "/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/xmlrpc/client.py", line 1166, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/xmlrpc/client.py", line 1182, in single_request
    return self.parse_response(resp)
  File "/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/xmlrpc/client.py", line 1354, in parse_response
    return u.close()
  File "/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/xmlrpc/client.py", line 668, in close
    raise Fault(**self._stack[0])
xmlrpc.client.Fault: <Fault 1: "<class 'TypeError'>:cannot marshal None unless allow_none is enabled">
$ cat ~/.pwclientrc
# Sample .pwclientrc file for the guix-patches project,
# running on patches.guix-patches.cbaines.net.
#
# Just append this file to your existing ~/.pwclientrc
# If you do not already have a ~/.pwclientrc, then copy this file to
# ~/.pwclientrc, and uncomment the following two lines:
# [options]
# default=guix-patches

[guix-patches]
url = https://patches.guix-patches.cbaines.net/xmlrpc/

[options]
default=guix-patches

[stephenfin]

This is actually a bug in the server: we shouldn't be returning None values as they're apparently not valid per the XMLRPC spec. However, that code is frozen so setting this config option is probably the correct thing to do.

Personally, I would recommend switching to the REST backend. It's the way forward. You can do this by setting backend = rest for the given project and updating the url value to point the REST API endpoint (likely $host/api).

[Bost]

Thx. But there's still a bit of work to do:

<bost> cbaines: this works:
<bost> [guix-patches]
<bost> backend = rest
<bost> url = https://patches.guix-patches.cbaines.net/api
<bost>
<cbaines> that's good :)
<bost> cbaines: please change the content of the pwclientrc (see bottom of https://patches.guix-patches.cbaines.net/project/guix-patches/)
<bost> cbaines: yeah, but there's bit of work for you, too :)
<cbaines> bost, it looks like that is hardcoded to use the xmlrpc API https://github.com/getpatchwork/patchwork/blob/668371ea0e848ab4c475306fcc259000d9dbf17c/patchwork/templates/patchwork/pwclientrc

See https://logs.guix.gnu.org/guix/2023-05-03.log#110410

[stephenfin]

Yeah, that's a good change for a future Patchwork release. The rest backend for pwclient is still beta'ish. It's probably mature enough to switch things over now though.

[stephenfin]

Opened an RFE to track this work as getpatchwork/patchwork#528