$ git clone -n https://github.com/xcp-ng-rpms/libevent /var/lib/mock/v8.3-u-pcoval1-9905-28607/root/chroot_tmpdir/scmroot/libevent
Cloning into '/var/lib/mock/v8.3-u-pcoval1-9905-28607/root/chroot_tmpdir/scmroot/libevent'...
$ git fetch origin 8b79a1d0f3e4facac2473ab09d8834f9ac39ae63:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libevent
 * [new ref]         8b79a1d0f3e4facac2473ab09d8834f9ac39ae63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b79a1d bump release for test build