Python

Python meetup Oct 2015

and

Nix

#nixos

Rok Garbas, @garbas

Ever heard somebody complaining about python packaging?

What is Nix?

TO INSTALL

  % curl https://nixos.org/nix/install | sh


TO UNINSTALL

  % rm -Rf /nix
  % rm -Rf ~/.nix*

Why Nix?

Features or

Nix protects me against me.

Nix exposes the things I forget.

Nix let's me do things multiple times consistently, even on different machines.

Nix, the one language to rule them all.

Quotes by Rob Vermas - http://nixer.ghost.io/why/

Nix protects me, against me

UPDATE CHANNELS (look at this as apt-get update)

  % nix-channel --update


INSTALL "tig" application

  % nix-env --list-generations
  1002   2015-01-23 04:29:40   
  1003   2015-01-23 04:44:51

  % nix-env -i tig

  % nix-env --list-generations
  1002   2015-01-23 04:29:40   
  1003   2015-01-23 04:44:51   
  1004   2015-01-23 04:50:11

UNDO / ROLLBACK

  % nix-env --rollback   <or  nix-env --switch-generation 1003>

  % nix-env --list-generations
  1002   2015-01-23 04:29:40   
  1003   2015-01-23 04:44:51

How can Nix do this?

HOOKS INTO BASH

  % echo $PATH
  /home/rok/.nix-profile/bin:/home/rok/.nix-profile/sbin:...

  % tree -L 2 `realpath ~/.nix-profile`
  /nix/store/xj8592ssnmcsn1kvbf87nm1acllwcqan-user-environment
  ├── bin
  │   ├── tig -> /nix/store/j3scw814k79mj3mm6x6yj9svvcq1plx4-tig-2.0.3/bin/tig
  │   ├── tree -> /nix/store/g75lq2kmfwx5sdqni6khv04kdklh3kq9-tree-1.7.0/bin/tree
  ├── etc
  │   ├── bash_completion.d -> /nix/store/j3scw814k79mj3mm6x6yj9svvcq1plx4-tig-2.0.3/etc/bash_completion.d
  │   └── tigrc -> /nix/store/j3scw814k79mj3mm6x6yj9svvcq1plx4-tig-2.0.3/etc/tigrc
  └── manifest.nix -> /nix/store/gjia0lic4v117fm3la3c4wkk6ig2iw3q-env-manifest.nix

/nix/store/j3scw814k79mj3mm6x6yj9svvcq1plx4-tig-2.0.3

/nix/store/

+

<hash>

+

<name>

+

How can we use Nix with Python?


  % nix-virtualenv path/to/folder -p pypy


JUST LIKE VIRTUALENV! ACTUALLY MORE...

  % nix-virtualenv path/to/folder -P postgresql -P lxml

nix-virtualenv

pypi2nix


  % pypi2nix requirements.txt
  Generating default.nix

  % nix-shell

Python

and

Nix

#nixos

Rok Garbas, @garbas

Ever heard somebody complaining about python packaging?

What is Nix?

Why Nix?

Features or

Nix protects me, against me

How can Nix do this?

How can we use Nix with Python?

Is this all that Nix can do?

Hydra

NixOS

NixOps

source / binary model

multi-user

reproducable

multi-version

portable

Thank you

and stay "pure"

NixOS conference

Rok Garbas, @garbas