$ git clone -n https://src.fedoraproject.org/rpms/python-y-py.git /var/lib/mock/f40-build-2107177-50596/root/chroot_tmpdir/scmroot/python-y-py
Cloning into '/var/lib/mock/f40-build-2107177-50596/root/chroot_tmpdir/scmroot/python-y-py'...
$ git fetch origin 2b1ca7f01b44814842399a3a71ded2f06d7826b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-y-py
 * [new ref]         2b1ca7f01b44814842399a3a71ded2f06d7826b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b1ca7f Update to 0.6.2 (rhbz#2242258)