$ git clone -n https://src.fedoraproject.org/rpms/R-V8.git /var/lib/mock/f40-build-789495-135730/root/chroot_tmpdir/scmroot/R-V8
Cloning into '/var/lib/mock/f40-build-789495-135730/root/chroot_tmpdir/scmroot/R-V8'...
$ git fetch origin bfa93576f34ecc5f7f9d80d57385c58f7f4344d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-V8
 * [new ref]         bfa93576f34ecc5f7f9d80d57385c58f7f4344d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfa9357 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild