On a terminal, run rsync with --info=progress2 and draw its updates as a
progress bar on stderr. The ETA is estimated locally, since rsync reports
the elapsed time when a file finishes. Disable it with --no-progress.
The config values are now a TypedDict, so check inputs for None before sorting, use literal keys and use ConfigArgs as the fake _read_config() return type.
Test how command line and config values are combined, the exit codes for an incomplete SSH setup and a bad config, and the user detection under sudo/doas (simulated by patching geteuid and the environment).
Fuxino
