$ git clone -n https://src.fedoraproject.org/rpms/R-argon2.git /var/lib/mock/f41-build-1111456-20153/root/chroot_tmpdir/scmroot/R-argon2
Cloning into '/var/lib/mock/f41-build-1111456-20153/root/chroot_tmpdir/scmroot/R-argon2'...
$ git fetch origin c0dcb187b44ad995fe27644c267597a8b4ff804e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-argon2
 * [new ref]         c0dcb187b44ad995fe27644c267597a8b4ff804e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0dcb18 Eliminate use of obsolete %patchN syntax (#2283636)