[Help-tar] Exitcodes when creating archives

[Benibr]

Hi,

my company is maintaining an patched version of tar because some scripts 
expect an exitcode 0 even if the archived files change while creating 
the tar file.
I read the tar manual [1] and figured out, that an exitcode 1 should be 
uncritical while creating an archive since tar 1.19. I also read the 
(patched) sourcecode and didn't find any part which says something else. 
However I couln't figure out how to proof that.

So the question is: can I be absolutly sure that an exitcode 1 is only 
thrown when a file changes while creating the archive? A possible 
command would be "tar --numeric-owner --listed-incremental -cpPf"

Thanks & Regards,
Benibr


[1] http://man7.org/linux/man-pages/man1/tar.1.html#RETURN_VALUE