$ git clone -n https://src.fedoraproject.org/rpms/rust-num_cpus.git /var/lib/mock/f39-build-1522115-35884/root/chroot_tmpdir/scmroot/rust-num_cpus
Cloning into '/var/lib/mock/f39-build-1522115-35884/root/chroot_tmpdir/scmroot/rust-num_cpus'...
$ git fetch origin b24bc7cf6930cf934bef89c1dcc9b16584eefa77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num_cpus
 * [new ref]         b24bc7cf6930cf934bef89c1dcc9b16584eefa77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b24bc7c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild