Re: version 2.2 --remove-older-than behavior changed

[email protected] 2023-02-17 03:41:
> IMHO, "No increment is older than ...." is normal behavior and should
> not cause a warning, especially since nonzero status codes are
> considered abnormal termination by most shells (even the Python docs
> <https://docs.python.org/3/library/sys.html#sys.exit> mention this),
> and can cause backup scripts to terminate.

    yes that's the behavior of version 2.0.5. with rdiff-backup 2.2 I see 
man page mention:

RETURN CODES
2 - WARNING
            any kind of unexpected behavior without complete failure

    but I don't know what condition meet the description. when 
rdiff-backup is working there are many things will happen like:
"file can not open", "fifo files too long", "xattr can not backup". will 
these become "return code 2" in the future? currently they are still 
"return code 0".
should I say "return code 2" means the job is still finished but with 
some kind of warnings?