$ git clone -n https://github.com/xcp-ng-rpms/gnutls.git /var/lib/mock/v8.3-u-pcoval2-10154-28747/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10154-28747/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin 0d2db9c55954560eb4082fa2d65d3a824dfa01f6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/gnutls
 * [new ref]         0d2db9c55954560eb4082fa2d65d3a824dfa01f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d2db9c bump release for test build