config changes, xmldiff (was: Re: CRITICAL Shibboleth Security Advisory 20110725)

[Peter Schober]

* Chad La Joie <lajoie at itumi.biz> [2011-08-18 22:14]:
> One thing you might want to consider now that we have, I think, all
> the MIME types on our files correct is to use that instead of checking
> to see if the file ends in .xml.  Just use 'svn propget svn:mime-type
> FILE'.

I thought about this but during `svn diff --diff-cmd` there is no MIME
(or any other propset) information made available to the external diff
command, just a list of obscure arguments assuming the use of GNU
diff/diff3:

  "Subversion continues to throw all those GNU utility options at your
   external diff tool regardless of whether that program can
   understand those options."
   http://svnbook.red-bean.com/nightly/en/svn.advanced.externaldifftools.html

E.g.

Index: attribute-resolver.xml
===================================================================
['/path/to/svnxmldiffwrapper', '-u', '-L',
'attribute-resolver.xml\t(.../2.2.1/src/installer/resources/conf-tmpl)\t(revision 3064)',
'-L',
'attribute-resolver.xml\t(.../2.3.0/src/installer/resources/conf-tmpl)\t(revision 3064)',
'/tmp/tempfile.3.tmp', '/tmp/tempfile.4.tmp']

Granted one might fire off an external command to check the mime type
for the file mentioned as the fourth argument. Checking the filename
obviously is a shortcut.
-peter