$ git clone -n https://src.fedoraproject.org/rpms/rust-num0.3.git /var/lib/mock/f42-build-3232288-41193/root/chroot_tmpdir/scmroot/rust-num0.3
Cloning into '/var/lib/mock/f42-build-3232288-41193/root/chroot_tmpdir/scmroot/rust-num0.3'...
$ git fetch origin ff1be25371bfb3c0fb7650e6b446664698935185:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num0.3
 * [new ref]         ff1be25371bfb3c0fb7650e6b446664698935185 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff1be25 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild