$ git clone -n https://src.fedoraproject.org/rpms/python-google-cloud-spanner.git /var/lib/mock/f38-build-side-42-init-devel-1035293-29746/root/chroot_tmpdir/scmroot/python-google-cloud-spanner
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1035293-29746/root/chroot_tmpdir/scmroot/python-google-cloud-spanner'...
$ git fetch origin a5791303620ae5695ea505b5bd86e0597fce90f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-google-cloud-spanner
 * [new ref]         a5791303620ae5695ea505b5bd86e0597fce90f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a579130 Update to 3.38.0 rhbz#2224695