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DefaultTimeoutStartSec is normally set to 90 seconds and works fine. But when running NixOS tests on a very slow machine (like a VM without nested virtualisation support) this default is to low and causes systemd units to fail spuriously. One symptom of this issue are tests at times failing with "timed out waiting for the VM to connect". Since the VM connect timeout is 300 seconds I also set DefaultTimeoutStartSec to this which is ridiculously high.
Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:
% git remote add channels https://github.com/NixOS/nixpkgs-channels.git
For stability and maximum binary package support, it is recommended to maintain
custom changes on top of one of the channels, e.g. nixos-18.03 for the latest
release and nixos-unstable for the latest successful build of master:
% git remote update channels
% git rebase channels/nixos-18.03
For pull-requests, please rebase onto nixpkgs master.
NixOS Linux distribution source code is located inside
nixos/ folder.
- NixOS installation instructions
- Documentation (Nix Expression Language chapter)
- Manual (How to write packages for Nix)
- Manual (NixOS)
- Community maintained wiki
- Continuous package builds for unstable/master
- Continuous package builds for 18.03 release
- Tests for unstable/master
- Tests for 18.03 release
Communication: