$ git clone -n https://src.fedoraproject.org/rpms/receptor.git /var/lib/mock/f40-build-2136367-50815/root/chroot_tmpdir/scmroot/receptor
Cloning into '/var/lib/mock/f40-build-2136367-50815/root/chroot_tmpdir/scmroot/receptor'...
$ git fetch origin 928a4294d49dc9f96692cc71328f7d4c38bd1ebe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/receptor
 * [new ref]         928a4294d49dc9f96692cc71328f7d4c38bd1ebe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 928a429 Update to 1.4.3 and removed unneeded script