$ git clone -n https://src.fedoraproject.org/rpms/ansible-builder.git /var/lib/mock/f41-build-side-2-python-2682766-30051/root/chroot_tmpdir/scmroot/ansible-builder
Cloning into '/var/lib/mock/f41-build-side-2-python-2682766-30051/root/chroot_tmpdir/scmroot/ansible-builder'...
$ git fetch origin 5af56477dde973366f2834fb386e598e1c86f2ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ansible-builder
 * [new ref]         5af56477dde973366f2834fb386e598e1c86f2ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5af5647 Update to 3.1.0. Fixes rhbz#2293508.