$ git clone -n https://src.fedoraproject.org/rpms/jemalloc.git /var/lib/mock/f41-build-side-1-2642809-26829/root/chroot_tmpdir/scmroot/jemalloc
Cloning into '/var/lib/mock/f41-build-side-1-2642809-26829/root/chroot_tmpdir/scmroot/jemalloc'...
$ git fetch origin c78f09cceec634f0ba977cb86d987f7caf200ceb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jemalloc
 * [new ref]         c78f09cceec634f0ba977cb86d987f7caf200ceb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c78f09c convert license to SPDX