Description of problem:

the support script rrsync does not support the valid --mkpath option when invoking rsync.

This was fixed in https://github.com/WayneD/rsync/issues/200 in 2021. Since then several versions of rsync including that fix were released.

the c9s* branches use a very outdated version of rsync: https://git.centos.org/rpms/rsync/blob/c9-beta/f/SPECS/rsync.spec

Steps to Reproduce:
1. configure rrsync on the authorized_keys file of the target server
2. attempt to rsync with the --mkpath argument
3. rsync fails with a message: "rrsync: unsupported argument"

Expected results:

rsync should succeed