[Bug-cpio] when given no files, perhaps fail?

[jidanni]

Maybe if given no files,
$ < /dev/null cpio -o > /dev/null; echo $?
1 block
0
This should fail instead? With perhaps an error message "no files to
copy"?

Hmmm, this too
$ < /dev/null cpio -o|cpio -t
1 block
1 block

Or... never mind.