$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.20.git /var/lib/mock/f40-build-2682009-67963/root/chroot_tmpdir/scmroot/rust-nix0.20
Cloning into '/var/lib/mock/f40-build-2682009-67963/root/chroot_tmpdir/scmroot/rust-nix0.20'...
$ git fetch origin d2017abdf8ffe9ef289c3757e26eaab551245641:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.20
 * [new ref]         d2017abdf8ffe9ef289c3757e26eaab551245641 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2017ab Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild