$ git clone -n https://src.fedoraproject.org/rpms/swtpm.git /var/lib/mock/f42-bootstrap-3462956-45593/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/f42-bootstrap-3462956-45593/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin b84e3d7d9999b1486d5ff6a0a2d3052cfc56700e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swtpm
 * [new ref]         b84e3d7d9999b1486d5ff6a0a2d3052cfc56700e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b84e3d7 Fix issue when --reconfigure'ing swtpm and a profile must not be passed