$ git clone -n https://src.fedoraproject.org/rpms/R-V8.git /var/lib/mock/f40-build-2270220-54796/root/chroot_tmpdir/scmroot/R-V8
Cloning into '/var/lib/mock/f40-build-2270220-54796/root/chroot_tmpdir/scmroot/R-V8'...
$ git fetch origin cc7cef398cff886e182166a0a1a4d643af8ebd23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-V8
 * [new ref]         cc7cef398cff886e182166a0a1a4d643af8ebd23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc7cef3 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild