$ git clone -n https://src.fedoraproject.org/rpms/collectd.git /var/lib/mock/f40-build-733748-105385/root/chroot_tmpdir/scmroot/collectd
Cloning into '/var/lib/mock/f40-build-733748-105385/root/chroot_tmpdir/scmroot/collectd'...
$ git fetch origin 1254553d8e7ce71d03427282e84b57f8e9a8f2ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/collectd
 * [new ref]         1254553d8e7ce71d03427282e84b57f8e9a8f2ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1254553 Re-enable mqtt plugin