$ git clone -n https://src.fedoraproject.org/rpms/python-blurb.git /var/lib/mock/f45-build-29788-641/root/chroot_tmpdir/scmroot/python-blurb
Cloning into '/var/lib/mock/f45-build-29788-641/root/chroot_tmpdir/scmroot/python-blurb'...
$ git fetch origin a5f66b19c3986716f29d9f9c54a4f3ddce015718:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-blurb
 * [new ref]         a5f66b19c3986716f29d9f9c54a4f3ddce015718 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5f66b1 Update to 2.1.0 (rhbz#2524999)