Release 3.12.0 (2025-10-23)

What's Changed

nix nario

Determinate Nix has a new command, nix nario, that replaces the commands nix-store --export and nix-store --import from the old CLI. nix nario allows you to serialize store paths to a file that can be imported into another Nix store. It is backwards compatible with the file format generated by nix-store --export. It also provides a new format (selected by passing --format 2) that supports store path attributes such as signatures, and allows store paths to be imported more efficiently.

Other changes

nix flake clone now supports arbitrary input types. In particular, this allows you to clone tarball flakes, such as flakes on FlakeHub.

When using -vv, Determinate Nix now prints the Nix version. This is useful when diagnosing Nix problems from the debug output of a Nix run.

Full Changelog: v3.11.3...v3.12.0