$ git clone -n https://github.com/xcp-ng-rpms/swtpm.git /var/lib/mock/v8.3-u-pcoval2-10604-29159/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10604-29159/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin bf1a792ecccfd73e655bab4dea178b65810b1535:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/swtpm
 * [new ref]         bf1a792ecccfd73e655bab4dea178b65810b1535 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf1a792 bump release for test build