$ git clone -n https://src.fedoraproject.org/rpms/json-glib.git /var/lib/mock/f41-build-851425-165944/root/chroot_tmpdir/scmroot/json-glib
Cloning into '/var/lib/mock/f41-build-851425-165944/root/chroot_tmpdir/scmroot/json-glib'...
$ git fetch origin c33fcca322870c5c954bba5614c15aeb63a36842:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/json-glib
 * [new ref]         c33fcca322870c5c954bba5614c15aeb63a36842 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c33fcca Update to 1.10.0