How do I determine if a commit of a property change will succeed

I am trying to write a script to automate our branching procedure which
uses svnmerge. Therefore I have to run svnmerge init followed by an svn
commit of the top level directory property change. The problem is that
if someone has made a change to the contents of that directory and
committed the change but has not done an update the commit will fail
because the directory is out of date.

Is there any way (using the command line svn client) that I can work out
in advance that this commit will fail?

svn info of the directory and its contents give no clue that the update
is needed.

To spell it out, if I have a file structure like this:

d1/
   d2/
   d3/
   file2
   file3

and I delete d2 and commit d1.

Then I do:

svnmerge init -f commitmsg.txt
svn commit --non-recursive --file commitmsg.txt .

The svn commit will fail.

-- 
Martin Tomes
echo 'martin at tomes x org x uk'\
  | sed -e 's/ x /\./g' -e 's/ at /@/'
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