git-describe currently gives out:
$ git describe --always --tags
2.0.0-616-g804abe8
As far as I can see, the commit tagged 2.1.0 is the only one not in master's history:
$ git log --oneline --graph --decorate origin/master..2.1.0
* fdb9e30 (tag: uvcdat-2.1.0, tag: 2.1.0, origin/release-2.1.0, origin/release)