$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/f40-build-1934890-25129/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/f40-build-1934890-25129/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin 018016bb32a060061846e55b3c2e1ac246493f04:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         018016bb32a060061846e55b3c2e1ac246493f04 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 018016b 1.34.153