$ git clone -n https://src.fedoraproject.org/rpms/dnf-plugin-diff.git /var/lib/mock/f41-build-side-1-2634192-26013/root/chroot_tmpdir/scmroot/dnf-plugin-diff
Cloning into '/var/lib/mock/f41-build-side-1-2634192-26013/root/chroot_tmpdir/scmroot/dnf-plugin-diff'...
$ git fetch origin c59cd7c50de85221d32c7b43e9a7b57fefda6dc5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dnf-plugin-diff
 * [new ref]         c59cd7c50de85221d32c7b43e9a7b57fefda6dc5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c59cd7c convert GPLv2+ license to SPDX