$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-u-ydi1-10974-29425/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-u-ydi1-10974-29425/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin 6d916eb4e7719579d7f0a6366edf1fac73f5115f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         6d916eb4e7719579d7f0a6366edf1fac73f5115f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d916eb bump release for test build