cergen needs to be build for buster. I'll most probably need some code changes, the current setup.py specifies "networkx < 2", which Buster has 2.2.
|operations/puppet : production||Install python3-lib2to3 on buster|
|operations/puppet : production||Create a separate component/cergen|
|cergen : master||signer: update networkx and python3-cryptography support|
networkx has some breaking API changes between 1.x and 2.x which are non-trivial to resolve. To unbreak the use of cergen on buster the build has been adapted to use a forward-ported 1.11 package on a separate component for buster-wikimedia (component/cergen, which now also includes cergen itself).