[EP-tech] Coverpage and revisions

[Paolo Tealdi]

Dear all,
it's two year that we are using in production environment a deeply modified 
plugin to create CoverPages  for our open access publications.
The plugin, if the attachment is open, creates on the fly a coverpaged version 
of the attachment, linked to the original one adding an object eprint relation.

The piece of code that save the relation is :

   if ($cpdoc) { 
            #Coverpaged document
     $doc->add_object_relations($cpdoc, 
            #Adding relation
                                EPrints::Utils::make_relation( 
"hasCoverPageVersion" ) =>
                                EPrints::Utils::make_relation( 
"isCoverPageVersionOf" ));
     $cpdoc->commit; 
            #Commit coperpaged document
     $doc->commit; 
            #Commit original document (and also eprint)
     # $doc->commit also triggers a $eprint->commit
     # fake the mtime of the coverpage to be at least the lastmod time of the eprint
     my $cpfile = $cpdoc->get_stored_file($cpdoc->get_main);
     my $eprint = $doc->get_parent();
     if ($cpfile && $eprint) {
       $cpfile->set_value('mtime', $eprint->get_value('lastmod'));
       $cpfile->commit;
     }

All well. It works very well and we are very satisfied for that plugin (Honor to 
Wirtschafts Universitat Wien guys).

We have noticed that for every coverpage created eprints stores a revision. I 
found a record that has >4K revisions, all triggering the new coverpage version 
created (we are noticing that our document filesystem has >1.4M files for 80K 
eprints document ... ) .
Is there a way to force eprints not to create a revision when a coverpage is 
created, modifying that piece of code ? If i remember well for "normal" eprints 
field, creating a revision is triggered by "volatile" attribute field, but for 
document object relations ?
maybe forcing  $doc->{non_volatile_change} to false before the commit ?

Best regards and have a nice weekend.
Paolo Tealdi


-- 
Ing. Paolo Tealdi         Area IT - Politecnico Torino
Telefono/Phone : +39-011-0906714 , FAX : +39-011-0906625
Indirizzo/Address : C.so Duca degli Abruzzi,  24 - 10129 Torino - ITALY
Skype : tealdi.paolo
Please consider your environmental responsibility before printing this e-mail