$ git clone -n https://src.fedoraproject.org/rpms/python-simplejson.git /var/lib/mock/f40-build-2029722-47498/root/chroot_tmpdir/scmroot/python-simplejson
Cloning into '/var/lib/mock/f40-build-2029722-47498/root/chroot_tmpdir/scmroot/python-simplejson'...
$ git fetch origin 4afce7cc73fe519f08bc88f5bafe14308b2846be:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-simplejson
 * [new ref]         4afce7cc73fe519f08bc88f5bafe14308b2846be -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4afce7c Update to 3.19.2 (#2242451)