$ git clone -n https://src.fedoraproject.org/rpms/python-google-cloud-bigtable.git /var/lib/mock/f39-build-1959835-43267/root/chroot_tmpdir/scmroot/python-google-cloud-bigtable
Cloning into '/var/lib/mock/f39-build-1959835-43267/root/chroot_tmpdir/scmroot/python-google-cloud-bigtable'...
$ git fetch origin 244610fe9354e4529f5caf27ea17ace8deb8369e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-google-cloud-bigtable
 * [new ref]         244610fe9354e4529f5caf27ea17ace8deb8369e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 244610f Update to 2.21.0