$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/f41-build-side-1-3134499-39756/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/f41-build-side-1-3134499-39756/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin b1e5367483bb217a73d6b271084b26f9a09b766e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         b1e5367483bb217a73d6b271084b26f9a09b766e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1e5367 1.35.63