| 12 Jun 2022 |
 das_j | grahamc (he/him): Btw, Hydra won't survive y2038 because timestamp has type integer (4 bytes) | 14:56:01 |
 @ulrikstrid:matrix.org | What is the correct way of building a nixosConfiguration? | 17:44:38 |
 kenran_ | In reply to @ulrikstrid:matrix.org
What is the correct way of building a nixosConfiguration? What do you mean exactly? A NixOS configuration with a hydra service? Your question sounds like it's about the flake output type. | 19:18:01 |
| kenran_ | In reply to @lewo:matrix.org
kenran_: is KVM enabled on your Hydra instance? It's in system-features, but that's probably not what you mean!? The machine is a VM in the cloud; I'll check tomorrow, but given that it takes 5 minutes to run this test I don't think it is :) | 19:19:24 |
| @ulrikstrid:matrix.org | In reply to @kenran_:matrix.org
What do you mean exactly? A NixOS configuration with a hydra service? Your question sounds like it's about the flake output type. I manage my computers with flakes and want to have my hydra build the configurations and ideally I would deploy from that | 19:33:14 |
 lewo | kenran_: having kvm in system-features is not enough to ensure Nix have enough permissions on /dev/kvm (if nested KVM is provided by your cloud provider) | 19:36:15 |
| kenran_ | In reply to @ulrikstrid:matrix.org
I manage my computers with flakes and want to have my hydra build the configurations and ideally I would deploy from that Oh, that sounds very nice! I'm interested in knowing more now, too!
Is the building part just adding a hydraJobs.my-host.${system} = self.nixosConfigurations.my-host? | 19:36:28 |
| das_j | In reply to @lewo:matrix.org
kenran_: having kvm in system-features is not enough to ensure Nix have enough permissions on /dev/kvm (if nested KVM is provided by your cloud provider) Adding kvm to the system features is already wrong. Nix autodetects kvm and adds the feature | 19:36:46 |
| lewo | kenran_: and if KVM is not available, it can be pretty hard to get NixOS test working. | 19:37:08 |
| das_j | In reply to @janne.hess:helsinki-systems.de
Adding kvm to the system features is already wrong. Nix autodetects kvm and adds the feature https://github.com/NixOS/nix/blob/master/src/libstore/globals.cc#L128-L129 | 19:37:33 |
| kenran_ | In reply to @lewo:matrix.org
kenran_: having kvm in system-features is not enough to ensure Nix have enough permissions on /dev/kvm (if nested KVM is provided by your cloud provider) I probably know way too little about kvm, but I was under the impression (someone in the nixos channel told me) that they should be running even without "actual" kvm support.
Surely you're right of course. I'm just trying to understand: does that explain why some versions of the tests work, but others don't? | 19:38:35 |
 ajs124 | vm tests should run, just very very veeeeeryyyy slow | 19:39:07 |
| lewo | KVM provide hardware acceleration of virtualization functions. So, if you don't have it, it can be really slow (order of magnitude)... | 19:39:50 |
