$ git clone -n https://src.fedoraproject.org/rpms/R-sodium.git /var/lib/mock/f38-build-724170-99404/root/chroot_tmpdir/scmroot/R-sodium
Cloning into '/var/lib/mock/f38-build-724170-99404/root/chroot_tmpdir/scmroot/R-sodium'...
$ git fetch origin dd5f2e42f21b416749e84081340e8e3411199adf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sodium
 * [new ref]         dd5f2e42f21b416749e84081340e8e3411199adf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd5f2e4 Ignore vignettes