$ git clone -n https://src.fedoraproject.org/rpms/libcoap.git /var/lib/mock/f31-build-58329-28436/root/chroot_tmpdir/scmroot/libcoap
Cloning into '/var/lib/mock/f31-build-58329-28436/root/chroot_tmpdir/scmroot/libcoap'...
$ git reset --hard ca8a1be63c9785e3dc997a06d6309fc689c84a00
HEAD is now at ca8a1be 4.2.0 GA