Comment # 3 on bug 951402 from Michael Andres

1) Create a pluginservice: Install this script as
/usr/lib/zypp/plugins/services/testservice
> #!/usr/bin/python
> import sys
> if True:
>     sendback = sys.stdout
>     print >>sendback
>     print >>sendback, "[sumafake]"
>     print >>sendback, "name=sumafake"
>     print >>sendback, "baseurl=dir:/tmp/sumafake"
>     print >>sendback, "enabled=1"
>     print >>sendback, "autorefresh=1"
>     # bnc#823917: Always disable gpgcheck as SMgr does not sign metadata,
>     # even if the original gpg_key_url is known.
>     print >>sendback, "gpgcheck=1"
>     # fate#314603 check package signature if metadata not signed
>     print >>sendback, "pkg_gpgcheck=1"
>     print >>sendback, "repo_gpgcheck=1"
> sys.exit(0)

2) Refresh the services 
> # zypper refs

3) Check the created repo file cat /etc/zypp/repos.d/testservice:sumafake.repo
> # grep gpgcheck /etc/zypp/repos.d/testservice:sumafake.repo
> gpgcheck=1
> repo_gpgcheck=1
> pkg_gpgcheck=1

4) Change the values for *gpgcheck in the python script; call 'zypper refs' 
==> testservice:sumafake.repo must reflect the changes

With a broken libzypp the initial values remain unchanged.