$ git clone -n https://src.fedoraproject.org/rpms/collectd.git /var/lib/mock/f43-perl-60961511-6586810/root/chroot_tmpdir/scmroot/collectd
Cloning into '/var/lib/mock/f43-perl-60961511-6586810/root/chroot_tmpdir/scmroot/collectd'...
$ git fetch origin 427255c0c51c8b9535b3bb2e5b6449fcd7080c5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/collectd
 * [new ref]         427255c0c51c8b9535b3bb2e5b6449fcd7080c5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 427255c Perl 5.42 rebuild