$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-u-ydi1-10978-29425/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-u-ydi1-10978-29425/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin ccfd0f95284b51a26403257ebb219dba6d3306a1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         ccfd0f95284b51a26403257ebb219dba6d3306a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ccfd0f9 bump release for test build