$ git clone -n https://github.com/xcp-ng-rpms/gnutls.git /var/lib/mock/v8.3-u-pcoval1-10886-29384/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/v8.3-u-pcoval1-10886-29384/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin aebec24c73d0fe1eb317c04ad6591c20c1c5912b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/gnutls
 * [new ref]         aebec24c73d0fe1eb317c04ad6591c20c1c5912b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aebec24 bump release for test build