$ git clone -n https://src.fedoraproject.org/rpms/dnsmasq.git /var/lib/mock/f40-build-774008-127559/root/chroot_tmpdir/scmroot/dnsmasq
Cloning into '/var/lib/mock/f40-build-774008-127559/root/chroot_tmpdir/scmroot/dnsmasq'...
$ git fetch origin 31e2c5fa8f72c18c59eddf0d7b67900effde2009:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dnsmasq
 * [new ref]         31e2c5fa8f72c18c59eddf0d7b67900effde2009 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31e2c5f Use local-service=host for initial configuration (#2258062)