$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-u-ydi1-11250-29609/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-u-ydi1-11250-29609/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin 7c291decbdfd0386061af0fff55bd9e02407b37b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         7c291decbdfd0386061af0fff55bd9e02407b37b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c291de bump release for test build