3.0.0 (14 Oct 2020)

flakes pypi gateway, R support, new output formats, more packages for python 3.5/3.6, improved providers nixpkgs/wheel

IMPORTANT NOTICE

The UI has been reworked. It is backward compatible with a few exceptions. Most importantly, when importing mach-nix, an attribute set must be passed. It can be empty. Example:

let
  mach-nix = import (builtins.fetchGit {
    url = "https://github.com/DavHau/mach-nix/";
    ref = "refs/tags/3.0.0";
  }) {
    # optionally bring your own nixpkgs
    # pkgs = import <nixpkgs> {};

    # or specify the python version
    # python = "python38";
  };
in
...

Features

Flakes gateway to pypi. Get a shell with arbitrary python packages. Example:
```
nix develop github:davhau/mach-nix#shellWith.requests.tensorflow.aiohttp
```
New output formats:
- mkDockerImage -> produces layered docker image containing a python environment
- mkNixpkgs -> returns nixpkgs which is conform to the given requirements
- mkOverlay -> returns an overlay function to make nixpkgs conform to the given requirements
- mkPythonOverrides -> produces pythonOverrides to make python conform to the given requirements.

New functions fetchPypiSdist and fetchPypiWheel. Example:

mach-nix.buildPythonPackge {
  src = fetchPypiSdist "requests" "2.24.0"
};

When using the mach-nix cmdline tool, the nixpkgs channel can now be picked via:
```
mach-nix env ./env -r requirements.txt --nixpkgs nixos-20.09
```
R support (experimental): R packages can be passed via packagesExtra. Mach-nix will setup rpy2 accordingly. See usage example.
Non-python packages can be passed via packagesExtra to include them into the environment.

Improvements

rework the logic for inheriting dependencies from nixpkgs
fixes.nix: allow alternative mod function signature with more arguments:
key-to-override.mod = pySelf: oldAttrs: oldVal: ...;
allow derivations passed as src argument to buildPythonPackage
stop inheriting attribute names from nixpkgs, instead use normalized package names
rework the public API of mach-nix (largely downwards compatible)
add example on how to build aarch64 image containing a mach-nix env
tests are now enabled/disabled via global override which is more reliable
raise error if python version of any package in packagesExtra doesn't match to one of the environment

Fixes

nixpkgs packages with identical versions swallowed
pname/version null in buildPythonPackage
update dependency extractor to use "LANG=C.utf8" (increases available packages for python 3.5 and 3.6)
wheel provider picked wheels incompatible to python version
unwanted python buildInput inheritance when overriding nixpkgs
properly parse setup/install_requires if they are strings instead of lists

Package Fixes

rpy2: sdist: remove conflicting patch for versions newer than 3.2.6
pytorch from nixpkgs was not detected as torch
pyqt5: fix for providers nixpkgs and wheel
httpx: remove patches

DavHau/mach-nix 3.0.0 3.0.0 (14 Oct 2020) on GitHub