2.2.0 (09 Aug 2020)

Improved success rate, MacOS support, bugfixes, optimizations

Features

• Improved selection of wheel releases. MacOS is now supported and architectures besides x86_64 should be handled correctly.
• Whenever mach-nix resolves dependencies, a visualization of the resulting dependency tree is printed on the terminal.
• The dependency DB is now accessed through a caching layer which reduces the resolver's CPU time significantly for larger environments.
• The python platform context is now generated from the nix build environment variable system. This should decrease the chance of impurities during dependency resolution.

Fixes

• The requires_python attribute of wheels was not respected. This lead to failing builds especially for older python versions. Now requires_python is part of the dependency graph and affects resolution.
• Detecting the correct package name for python packages in nixpkgs often failed since the attribute names don't follow a fixed schema. This lead to a handful of different errors in different situations. Now the package names are extracted from the pypi url inside the src attribute which is much more reliable. For packages which are not fetched from pypi, the pname attribute is used as fallback.
• Fixed bug which lead to the error attribute 'sdist' missing if a package from the nixpkgs provider was used which doesn't publish it's source on pypi. (For example tensorflow)

Other Changes

• Mach-nix now uses a revision of the nixpkgs-unstable branch instead of nixos-20.03 as base fo the tool and the nixpkgs provider.
• Updated revision of the dependency DB