$ git clone -n https://src.fedoraproject.org/rpms/R-V8.git /var/lib/mock/f39-build-1655759-40541/root/chroot_tmpdir/scmroot/R-V8
Cloning into '/var/lib/mock/f39-build-1655759-40541/root/chroot_tmpdir/scmroot/R-V8'...
$ git fetch origin b7ed740cbde52c1d5af15f8540dbec4400489798:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-V8
 * [new ref]         b7ed740cbde52c1d5af15f8540dbec4400489798 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7ed740 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild