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NH Changelog

Unreleased

Added

  • A new nh os rollback subcommand has been added to allow rolling back a generation, or to a specific generation with the --to flag. See nh os rollback --help for more details on this subcommand.

  • Nh now supports the --build-host and --target-host cli arguments

  • Nh now checks if the current Nix implementation has necessary experimental features enabled. In mainline Nix (CppNix, etc.) we check for nix-command and flakes being set. In Lix, we also use repl-flake as it is still provided as an experimental feature in versions below 2.93.0.

  • Nh will now check if you are using the latest stable, or "recommended," version of Nix (or Lix.) This check has been placed to make it clear we do not support legacy/vulnerable versions of Nix, and encourage users to update if they have not yet done so.

  • NixOS: Nh now accepts the subcommand nh os build-vm, which builds a virtual machine image activation script instead of a full system. This includes a new option --with-bootloader/-B that applies to just build-vm, to build a VM with a bootloader.

Changed

  • Darwin: Use darwin-rebuild directly for activation instead of old scripts
  • Darwin: Future-proof handling of activate-user script removal
  • Darwin: Improve compatibility with root-only activation in newer nix-darwin versions
  • NixOS: Check if the target hostname matches the running system hostname before running nvd to compare them.

4.0.3

Added

  • Nh now supports specifying NH_SUDO_ASKPASS to pass a custom value to SUDO_ASKPASS in self-elevation. If specified, sudo will be called with -A and the NH_SUDO_ASKPASS will be SUDO_ASKPASS locally.

Fixed

  • Fix --configuration being ignored in nh home switch (#262)

4.0.2

Added

  • Add --json to nh search, which will return results in JSON format. Useful for parsing the output of nh search with, e.g., jq.

4.0.1

Removed

  • NixOS 24.05 is now marked as deprecated, and will emit an error if the search command attempts to use it for the channel. While the Elasticsearch backend still seems to support 24.05, it is deprecated in Nixpkgs and is actively discouraged. Please update your system at your earliest convenience.