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# 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
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