Using drush up with --gitinfofile I tried to manage drupal modules with the --package_handler=git_drupalorg which needed me to add the --gitinfofile option. Using drush dl this works but if I try to update my modules with drush up the version information is the same as of the drush dl version.
Is there a fix for this or a guide which explains how to use drush with the git version control system.
I am using the drush 6.2.0 version.
Update: As mentioned in the comments below, the actual answer here is that the git deploy module is required for --package-handler=git_drupalorg to work correctly.

If you just want to track the latest HEAD from some branch of some module, then you can use drush dl with --package-handler=git_drupalorg to download the file, and use git pull when you want to update your code.

drush pm-updatecode is best used in instances where you wish to track the latest stable release of the module.