[Bugs] #2303 UNSP: unnecessary checkout for getting file size

[Sugar Labs Bugs]

#2303: unnecessary checkout for getting file size
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    Reporter:  sascha_silbe               |          Owner:  alsroot          
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.90             
   Component:  journal                    |        Version:  Git as of bugdate
    Severity:  Minor                      |       Keywords:                   
Distribution:                             |   Status_field:  Unconfirmed      
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Comment(by sascha_silbe):

 This is what I use in the version support branch now:

 {{{
         filesize = self._metadata.get('filesize')
         if filesize is None:
             object_id = (self._metadata['tree_id'],
 self._metadata['version_id'])
             filesize = model.get_file_size(object_id)

         lines = [
             _('Kind: %s') % (self._metadata.get('mime_type') or
 _('Unknown'),),
             _('Date: %s') % (self._format_date(),),
             _('Size: %s') % (format_size(int(filesize))),
             ]
 }}}

 Feel free to adapt for mainline.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2303#comment:1>
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