$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/f41-build-side-1-3128676-39569/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/f41-build-side-1-3128676-39569/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin d94aaecb985aec6777aa64721ca4f045ecaaf512:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         d94aaecb985aec6777aa64721ca4f045ecaaf512 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d94aaec 1.35.58