$ git clone -n https://src.fedoraproject.org/rpms/R-sodium.git /var/lib/mock/f40-build-2205088-51982/root/chroot_tmpdir/scmroot/R-sodium
Cloning into '/var/lib/mock/f40-build-2205088-51982/root/chroot_tmpdir/scmroot/R-sodium'...
$ git fetch origin 7f51e01024dcf4da877b2dcaedbaf7538a42f51c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sodium
 * [new ref]         7f51e01024dcf4da877b2dcaedbaf7538a42f51c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f51e01 rebuild for new libsodium