$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-incoming-11280-29616/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-incoming-11280-29616/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin 6da933cffbb62d14c5f81e1c296ba583137138c3:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         6da933cffbb62d14c5f81e1c296ba583137138c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6da933c Merge pull request #1 from xcp-ng-rpms/ydi/9