$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.17.git /var/lib/mock/f40-build-2682005-67963/root/chroot_tmpdir/scmroot/rust-nix0.17
Cloning into '/var/lib/mock/f40-build-2682005-67963/root/chroot_tmpdir/scmroot/rust-nix0.17'...
$ git fetch origin df73e4b7dbfdf42978a714334281bba539a9b2f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.17
 * [new ref]         df73e4b7dbfdf42978a714334281bba539a9b2f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df73e4b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild