$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/f40-build-2258066-54338/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/f40-build-2258066-54338/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin 6003980af245f2380817ebd5bb07c54819d0e55c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         6003980af245f2380817ebd5bb07c54819d0e55c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6003980 1.34.21