$ git clone -n https://src.fedoraproject.org/rpms/R-V8.git /var/lib/mock/f38-build-724277-99404/root/chroot_tmpdir/scmroot/R-V8
Cloning into '/var/lib/mock/f38-build-724277-99404/root/chroot_tmpdir/scmroot/R-V8'...
$ git fetch origin 44839fec328405fdb7cd57d1cf94dc3bb059e5fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-V8
 * [new ref]         44839fec328405fdb7cd57d1cf94dc3bb059e5fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44839fe Rebuild for nodejs20