$ git clone -n https://github.com/xcp-ng-rpms/sfc-module-alt.git /var/lib/mock/v8.3-incoming-11287-29620/root/chroot_tmpdir/scmroot/sfc-module-alt
Cloning into '/var/lib/mock/v8.3-incoming-11287-29620/root/chroot_tmpdir/scmroot/sfc-module-alt'...
$ git fetch origin 484cca87430bc90545080c06e228a23c41ae789a:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sfc-module-alt
 * [new ref]         484cca87430bc90545080c06e228a23c41ae789a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 484cca8 Initial packaging for 5.3.18.1012