bug#18838: zsh test suite failures, possibly due to 'noatime' mount flag

[Mark H Weaver <mhw@netris.org>]

Twice recently, once on x86_64 and once on i686, zsh has failed its test
suite while being built by hydra.  Here's the output in both cases:

--8<---------------cut here---------------start------------->8---
Test ./C02cond.ztst failed: bad status 1, expected 0 from:
  print -u $ZTST_fd 'This test takes two seconds...'
  sleep 2
  cat unmodified
  touch newnewnew
  if [[ $OSTYPE == "cygwin" ]]; then
    print -u$ZTST_fd "Warning: not testing [[ -N file ]] (not supported on Cygwin)"
    true
  elif [[ "$(find . -prune -fstype nfs 2>/dev/null)" == "." ]]; then
    print -u$ZTST_fd "Warning: not testing [[ -N file ]] (not supported with NFS)"
    true
  elif test -f /etc/mtab && { grep $(df . 2>/dev/null| tail -n1 | awk '{print $1}') /etc/mtab | grep -q noatime; }; then
    print -u$ZTST_fd "Warning: not testing [[ -N file ]] (not supported with noatime file system)"
    true
  else
    [[ -N newnewnew && ! -N unmodified ]]
  fi
Was testing: -N cond
./C02cond.ztst: test failed.
The following may (or may not) help identifying the cause:
  This test can fail on NFS-mounted filesystems as the access and
  modification times are not updated separately.  The test will fail
  on HFS+ (Apple Mac OS X default) filesystems because access times
  are not recorded.  Also, Linux ext3 filesystems may be mounted
  with the noatime option which does not update access times.
  Failures in these cases do not indicate a problem in the shell.
--8<---------------cut here---------------end--------------->8---

I restarted the x86_64 build and it succeeded on the second try.
Now it has failed on i686:

  http://hydra.gnu.org/build/128208

My first guess is that one of our build machines has the 'noatime' mount
option set on its /tmp.

Is there a way to tell from the URL above which build machine was used?

      Mark