I want to update my testserver up to a certain commit from the OCA/OCB repository. A git log on my production server gives me the commit ID I want to go for (6a8d070d581e17f2e6f032e6c98670cb75db5fe0)

~:/opt/odoo/odoo-server$ git log
commit 6a8d070d581e17f2e6f032e6c98670cb75db5fe0
Merge: f5b1544 55fa508
Author: OCA git bot <OCA-git-bot@therp.nl>
Date:   Thu Dec 4 23:42:27 2014 +0100

nomally I use git pull origin 8.0 for an update. Can someone advise a command that limits this to the commit ID mentioned above (the current OCA/OCB is already ahead of this commit)