$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.23.git /var/lib/mock/f40-build-2723408-73099/root/chroot_tmpdir/scmroot/rust-nix0.23
Cloning into '/var/lib/mock/f40-build-2723408-73099/root/chroot_tmpdir/scmroot/rust-nix0.23'...
$ git fetch origin 75e6ab533abfd1e5b115f7ab02eac0a92f7cacfc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.23
 * [new ref]         75e6ab533abfd1e5b115f7ab02eac0a92f7cacfc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75e6ab5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild