$ git clone -n https://github.com/xcp-ng-rpms/sm.git /var/lib/mock/v8.3-u-prebuild-9284-28059/root/chroot_tmpdir/scmroot/sm
Cloning into '/var/lib/mock/v8.3-u-prebuild-9284-28059/root/chroot_tmpdir/scmroot/sm'...
$ git fetch origin de18976210c38612f323fbf65c1f42edd2ef03f7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/sm
 * [new ref]         de18976210c38612f323fbf65c1f42edd2ef03f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de18976 bump release for test build