[Bug-tar] Verify option not working with incremental backups

[Andrew Henry]

I have used the following tar command for several months using TAR 1.16...

## make level0 backup
tar -cvPWf /media/1394disk/backuplvl0.tar --listed-incremental
/var/log/snar /home/

## copy snar file
cp /var/log/snar /var/log/snar-1

## make level 1 backup...just changes since level 0
tar -cvPWf /media/1394disk/backuplvl1.tar --listed-incremental
/var/log/snar-1 /home/

It all worked fine up until a few months ago i think, when I noticed
that my incremental backups were the same size as my level 0 backups.

Now, I have had chance to investigate and it appears that the W option
to verify the archive is not working with incremental backups.  If I
remove W then all works fine.  If W is included, then all incremental
backups are same size as level0.

Is this a known issue?  If so, is it fixed in 1.16.1?

Regards,
andrew

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