$ git clone -n https://src.fedoraproject.org/rpms/swtpm.git /var/lib/mock/f42-build-3338872-41426/root/chroot_tmpdir/scmroot/swtpm
Cloning into '/var/lib/mock/f42-build-3338872-41426/root/chroot_tmpdir/scmroot/swtpm'...
$ git fetch origin 6005db243b34fd829ad901ffd010b5c6972d7de3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swtpm
 * [new ref]         6005db243b34fd829ad901ffd010b5c6972d7de3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6005db2 Add another patch with more SELinux permissions