| 10 Apr 2023 |
 dantefromhell | * Emily:
colmena is stateless by design. and to know which nodes need to updated, you would have to keep track of the nodes closures/generations.
I disagree. For 1 commit this query should always be doable without contacting a host because the old & new desired state are clearly defined.
The situation I can think of where you need to check the deployed closures is if you are trying to solve "configuration drift" and deployment of patches with a single solution - which is kinda the common pattern in non-declarative environments.
But if you're looking at config drift (which I'm still wondering if that can actually be a reasonable thing within NixOS given the generations mechanism 🤔) and the "affected query" as 2 separate problems the aforementioned query actually becomes independent of colmena itself (and therefore the stateless limitation).
| 23:04:24 |
| dantefromhell | In reply to @whentze:matrix.org
we built something like that at work, kinda sweet! Is any of the work publicly available for inspiration? | 23:04:35 |
| dantefromhell | here's another question occupying my mind as I'm thinking about the structure for a new hive.
From reading past conversations in this channel it seems that one can define a host in (at least) 3 different ways
- with
colmena + a wrapper to wire the host configuration into nixOsConfiguration
- with
nixosConfiguration + some wrapper to make the host config colmena compatible
- outside of either
colmena or nixosConfiguration with 2 wrappers to make the host config compatible (as demonstrated in Yureka (she/her) suxin code)
After seeing code for each possibility I struggle to understand what are the down/ up sides of them in order to help me make the right decision.
As I'm guessing there's no "decision chart" available 😉 Could y'all help me to figure out what the pros/ cons/ limitations for the approaches are?
| 23:18:04 |
 Wanja Hentze | In reply to @dantefromhell:matrix.org
sweet! Is any of the work publicly available for inspiration? sadly no, but this part is pretty banal | 23:44:23 |
| Wanja Hentze | basically our CI builds all hosts and then checks for each one if the built hash is different than the one on there | 23:44:53 |
| Wanja Hentze | where it differs, it creates a deployment job | 23:45:05 |
| Wanja Hentze | in order to not have to SSH to check the hashes (which also works though) we have a little activation script that writes the current system hash to a textfile where the Prometheus node exporter (via plaintext exporter) picks it up so you can querry it via monitoring | 23:46:30 |
| Wanja Hentze | yes indeed we check the real deployment precisely to solve configuration drift | 23:47:46 |
| Wanja Hentze | looking at a commit and saying which hosts it changes would be super useful though, for code review for example | 23:49:42 |
| 11 Apr 2023 |
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| 12 Apr 2023 |
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| 13 Apr 2023 |
|  void joined the room. | 00:13:02 |
| void | hi there, I am trying to move from morph to colmena, having some trouble | 00:13:27 |
| void | its always the same trouble with these tools, i want to access nodes inside modules yet fail. | 00:13:46 |
| void | is nodes always provided cos in one of my modules if I define {pkgs, config, options, lib, nodes, ...}: I get attribute nodes missing. | 00:14:42 |
| void | prolly Im doing something wrong. | 00:15:23 |
| void | tried config._module.args.nodes still no luck ;( | 00:17:28 |
| void | it is maybe the case where I need to pass the args manually since this module is buried deep inside a config with imports = [ (import ./some-module) ]; | 00:18:59 |
 Zhaofeng Li | It should be present. Just making sure: It's not a submodule, right? | 00:28:40 |
| void | it is a chain of modules imported by import = [ some-module.nix ]; | 00:32:01 |
| void | basically it is a module that scans all other hosts in nodes to get a list and do something else with data from their configs. | 00:33:46 |
