$ git clone -n https://github.com/xcp-ng-rpms/libevent /var/lib/mock/v8.3-u-pcoval2-9907-28609/root/chroot_tmpdir/scmroot/libevent
Cloning into '/var/lib/mock/v8.3-u-pcoval2-9907-28609/root/chroot_tmpdir/scmroot/libevent'...
$ git fetch origin bf09c15cb66baa0b5ba6edf08c55773d50be6b49:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libevent
 * [new ref]         bf09c15cb66baa0b5ba6edf08c55773d50be6b49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf09c15 bump release for test build