3.3.0 (22 May 2021)

bugfixes, improvements

Changes

• The flakes cmdline api has been changed. New usage:

  nix (build|shell) mach-nix#gen.(python|docker).package1.package2...
  

  (Despite this changes being backward incompatible, I did not bump the major version since everything flakes related should be considered experimental anyways)

Improvements

• Mach-nix (used via flakes) will now throw an error if the selected nixpkgs version is newer than the dependency DB since this can cause conflicts in the resulting environment.
• When used via flakes, it was impossible to select the python version because the import function is not used anymore. Now python can be passed to mkPython alternatively.
• For the flakes cmdline api, collisions are now ignored by default
• The simplified override interface did not deal well with non-existent values.
  • Now the .add directive automatically assumes an empty list/set/string when the attribute to be extended doesn't exist.
  • Now the .mod directive will pass null to the given function if the attribute to modify doesn't exist instead.

Fixes

• Generating an environment with a package named overrides failed due to a variable name collision in the resulting nix expression.
• When used via flakes, the pypiData was downloaded twice, because the legacy code path for fetching was still used instead of the flakes input.
• nix flake show mach-nix failed because it required IFD for foreign platforms.
• For environments generated via mach-nix env ... the python command referred to the wrong interpreter.
• When checking wheels for compatibility, the minor version for python was not respected which could lead to invalid environments.
• Some python modules in nixpkgs propagate unnecessary dependencies which could lead to collisions in the final environment. Now mach-nix recursively removes all python dependencies which are not strictly required.

Package Fixes

• cryptography: remove rust related hook when version < 3.4