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| 26 Oct 2022 |
 @nixinator:nixos.dev | In reply to @tnias:stratum0.org
you can provide constrains like what packages you are interested in and (optionally) their version numbers, compiler flags, etc.
then there is a sat solver (they call it concretizer) that provides a solution to the constrains. This solution is saved as a *.lock file. From a lock file you can reproduce the environment.
packages can also provide their own constraints. as in: "version x of this package needs gcc >= 9"
Is the sat solver determistic ? I’ve used them before and they were seldom determistic when things got computationally expensive . Very interesting . | 22:24:48 |
| 30 Oct 2022 |
|  elzair joined the room. | 18:28:39 |
| elzair | Download nixtest.py | 18:30:08 |
| elzair | Hey, I am having trouble running the following python script using nix-shell to get dependencies:
I get the following error:
Traceback (most recent call last):
File "/home/elzair/Development/python/./nixtest.py", line 4, in <module>
gi.require_version('Gtk', '4.0')
File "/nix/store/gwq3inwc86axcxb82jpwkzci3hjpw1xd-python3.10-pygobject-3.42.2/lib/python3.10/site-packages/gi/init.py", line 126, in require_version
raise ValueError('Namespace %s not available' % namepsace)
ValueError: Namespace Gtk not available | 18:31:14 |
| elzair | What might be happening? | 18:31:21 |
| elzair | The script is pretty simple:
#! /usr/bin/env nix-shell
#! nix-shell -i python -p gtk4 python310 python310Packages.pygobject3
import gi
gi.require_version('Gtk', '4.0')
from gi.repository import Gtk
def on_activate(app):
win = Gtk.ApplicationWindow(application=app)
win.present()
app = Gtk.Application()
app.connect('activate', on_activate)
app.run(None) | 18:32:15 |
 @trofi:matrix.org | Try #dev:nixos.org room. This room usually focuses on bugs related to builds with non-deterministic output. | 18:46:12 |
| elzair | Thanks! | 18:46:20 |
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| 31 Oct 2022 |
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