Bug in mergemaster(8) when used in service jails (scheme described in chapter 15.6.1 of the handbook)

Hi Doug,

In the chapter 15.6.1 of the handbook, "Service jails", the last part
explains how to upgrade jails.  The last step is to run mergmaster(8) in
each jail.

The problem is that in service jails /etc is a symlink to /s/etc, /s
being the readable/writable filesystem.  mtree(8) stumbles on /etc being a
symlink instead of a directory and doesn't proceed futher down into /etc to
check files.  Consequently, ${CHANGED} is empty and all customized
configuration are overwritten with their default version.

I've fixed mergemaster(8) with the following patch:

% Index: mergemaster.sh
% ===================================================================
% RCS file: /mnt/space/cvsroot/src/usr.sbin/mergemaster/mergemaster.sh,v
% retrieving revision 1.69
% diff -u -r1.69 mergemaster.sh
% --- mergemaster.sh      23 Mar 2009 14:42:41 -0000      1.69
% +++ mergemaster.sh      10 May 2009 11:05:32 -0000
% _at__at_ -461,7 +461,7 _at__at_
%  #
%  CHANGED=
%  if [ -n "${AUTO_UPGRADE}" -a -f "${DESTDIR}${MTREEFILE}" ]; then
% -       for file in `mtree -eq -f ${DESTDIR}${MTREEFILE} -p ${DESTDIR}/ \
% +       for file in `mtree -eqL -f ${DESTDIR}${MTREEFILE} -p ${DESTDIR}/ \
%                 2>/dev/null | awk '($2 == "changed") {print $1}'`; do
%                 if [ -f "${DESTDIR}/$file" ]; then
%                         CHANGED="${CHANGED} ${DESTDIR}/$file"

Regards,
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >