$ git clone -n https://github.com/xcp-ng-rpms/libevent.git /var/lib/mock/v8.3-u-pcoval2-10354-28912/root/chroot_tmpdir/scmroot/libevent
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10354-28912/root/chroot_tmpdir/scmroot/libevent'...
$ git fetch origin 467686a8668af66ad797ec8f5b7982d22f66189e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libevent
 * [new ref]         467686a8668af66ad797ec8f5b7982d22f66189e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 467686a bump release for test build