$ git clone -n https://github.com/xcp-ng-rpms/dummypkg.git /var/lib/mock/v8.3-incoming-10467-29035/root/chroot_tmpdir/scmroot/dummypkg
Cloning into '/var/lib/mock/v8.3-incoming-10467-29035/root/chroot_tmpdir/scmroot/dummypkg'...
$ git fetch origin 797454be0d261535a1aa255d7eae040be2706bbd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/dummypkg
 * [new ref]         797454be0d261535a1aa255d7eae040be2706bbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 797454b Add PR template