$ git clone -n https://src.fedoraproject.org/rpms/munin.git /var/lib/mock/f40-build-2012192-45775/root/chroot_tmpdir/scmroot/munin
Cloning into '/var/lib/mock/f40-build-2012192-45775/root/chroot_tmpdir/scmroot/munin'...
$ git fetch origin c560021120cf1af88adc5bc6bf6bc90adef67c5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/munin
 * [new ref]         c560021120cf1af88adc5bc6bf6bc90adef67c5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c560021 2.0.75