$ git clone -n https://src.fedoraproject.org/rpms/json_simple.git /var/lib/mock/f41-build-797232-13657/root/chroot_tmpdir/scmroot/json_simple
Cloning into '/var/lib/mock/f41-build-797232-13657/root/chroot_tmpdir/scmroot/json_simple'...
$ git fetch origin a9ef8e43f120dfef2df7811a83c22662444074f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/json_simple
 * [new ref]         a9ef8e43f120dfef2df7811a83c22662444074f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9ef8e4 Eliminate use of obsolete %patchN syntax (#2283636)