$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.18.git /var/lib/mock/f40-build-2682006-67963/root/chroot_tmpdir/scmroot/rust-nix0.18
Cloning into '/var/lib/mock/f40-build-2682006-67963/root/chroot_tmpdir/scmroot/rust-nix0.18'...
$ git fetch origin 2063d4257cf85df54ed62ff6f5bde7cd9945ed21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.18
 * [new ref]         2063d4257cf85df54ed62ff6f5bde7cd9945ed21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2063d42 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild