salt-run fileserver.update
[WARNING ] /usr/lib/python2.7/dist-packages/salt/grains/core.py:1493: DeprecationWarning: The "osmajorrelease" will be a type of an integer.

[ERROR   ] Error occured fetching gitfs remote 'git@git.mldsc.de:lukas/salt-base.git': Failed to authenticate SSH session: Callback returned error
True