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>
+
<version>
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
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
14. - 15. November
http://conf.nixos.org
final wors...
Rok Garbas, @garbas
Nix and Python
By Rok Garbas
Nix and Python
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