$ git clone -n https://src.fedoraproject.org/rpms/collectd.git /var/lib/mock/f41-build-1290497-23344/root/chroot_tmpdir/scmroot/collectd
Cloning into '/var/lib/mock/f41-build-1290497-23344/root/chroot_tmpdir/scmroot/collectd'...
$ git fetch origin bbad982b2789a3f6097b2acecf9cbb6cdedc6a24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/collectd
 * [new ref]         bbad982b2789a3f6097b2acecf9cbb6cdedc6a24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbad982 Perl 5.40 rebuild