$ git clone -n https://src.fedoraproject.org/rpms/collectd.git /var/lib/mock/f45-build-6838-352/root/chroot_tmpdir/scmroot/collectd
Cloning into '/var/lib/mock/f45-build-6838-352/root/chroot_tmpdir/scmroot/collectd'...
$ git fetch origin ceb0a744ff7da0398f00bf7e4908711eb9019be9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/collectd
 * [new ref]         ceb0a744ff7da0398f00bf7e4908711eb9019be9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ceb0a74 Rebuild for libxml-2.5.4