$ git clone -n https://src.fedoraproject.org/rpms/maven-filtering.git /var/lib/mock/f41-build-712947-13044/root/chroot_tmpdir/scmroot/maven-filtering
Cloning into '/var/lib/mock/f41-build-712947-13044/root/chroot_tmpdir/scmroot/maven-filtering'...
$ git fetch origin 6c2a209d6c51543fa1aef52986267674e617a907:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-filtering
 * [new ref]         6c2a209d6c51543fa1aef52986267674e617a907 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c2a209 Switch to a newer %patch syntax