$ git clone -n https://src.fedoraproject.org/rpms/libjwt.git /var/lib/mock/f42-build-863089-171404/root/chroot_tmpdir/scmroot/libjwt
Cloning into '/var/lib/mock/f42-build-863089-171404/root/chroot_tmpdir/scmroot/libjwt'...
$ git fetch origin 6ed43e7bc8c224b80fae12cd9a8361b36056d480:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libjwt
 * [new ref]         6ed43e7bc8c224b80fae12cd9a8361b36056d480 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ed43e7 Rebuild for Jansson 2.14