$ git clone -n https://src.fedoraproject.org/rpms/felix-parent.git /var/lib/mock/f42-build-3403077-45134/root/chroot_tmpdir/scmroot/felix-parent
Cloning into '/var/lib/mock/f42-build-3403077-45134/root/chroot_tmpdir/scmroot/felix-parent'...
$ git fetch origin 8b1159720e9d1a77b1dc93a1cefe43e6d919b26b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/felix-parent
 * [new ref]         8b1159720e9d1a77b1dc93a1cefe43e6d919b26b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b11597 Disable XMvn javadoc MOJO