10.1-RC1 tar(1) spurious directory traversal permission error

[John Marshall]

I don't know if tar(1) is the culprit or an innocent bystander but this
is what I am seeing on 10.1-RC1 (r272468 amd64).  The archive appears to
be written properly prior to generation of the error message.  Although
the user is permitted to traverse the parent directory, tar(1) emits the
complaint if the parent directory is not readable.  Filesystem is UFS.

  $ tar -czf dtt.tgz -C /data/tftp/thlan .
  tar: .: Unable to continue traversing directory tree: Permission denied
  tar: Error exit delayed from previous errors.
  $ 

  $ ls -ld /data /data/tftp /data/tftp/thlan
  drwxr-xr-x  33 root  wheel  1024  2 Sep 20:13 /data
  drwxr-x--x   4 root  wheel   512 23 Apr 09:00 /data/tftp
  drwxr-x--x   3 john  wheel   512 23 Apr 10:28 /data/tftp/thlan

  # chmod o+r /data/tftp

  $ tar -czf dtt.tgz -C /data/tftp/thlan .
  $ 

I haven't played with 10.0 but this behaviour is different to other
earlier releases (e.g. 9.3-RELEASE doesn't do this).

I have filed a PR [Bug 194477].

-- 
John Marshall
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