$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-u-ydi1-10937-29407/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-u-ydi1-10937-29407/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin 8c9530a8f24b571cea7e79ecaec204ac3653f0aa:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         8c9530a8f24b571cea7e79ecaec204ac3653f0aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c9530a bump release for test build