$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-u-ydi1-11162-29572/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-u-ydi1-11162-29572/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin c09756af9cd2e04dddad294415a1d467b4e88051:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         c09756af9cd2e04dddad294415a1d467b4e88051 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c09756a bump release for test build