$ git clone -n https://github.com/xcp-ng-rpms/libempserver.git /var/lib/mock/v9.0-incoming-11268-29615/root/chroot_tmpdir/scmroot/libempserver
Cloning into '/var/lib/mock/v9.0-incoming-11268-29615/root/chroot_tmpdir/scmroot/libempserver'...
$ git fetch origin 462d0368e24a7223e051eb7e6969adc8c2cceb96:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libempserver
 * [new ref]         462d0368e24a7223e051eb7e6969adc8c2cceb96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 462d036 Merge branch 'XS-8.3'