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Hydra
Hydra is a Continuous Integration service for Nix based projects.
Installation And Setup
Note: The instructions provided below are intended to enable new users to get a simple, local installation up and running. They are by no means sufficient for running a production server, let alone a public instance.
Enabling The Service
Running Hydra is currently only supported on NixOS. The hydra module allows for an easy setup. The following configuration can be used for a simple setup that performs all builds on localhost (Please refer to the Options page for all available options):
{
services.hydra = {
enable = true;
hydraURL = "http://localhost:3000";
notificationSender = "hydra@localhost";
buildMachinesFiles = [];
useSubstitutes = true;
};
}
Creating An Admin User
Once the Hydra service has been configured as above and activate you should already be able to access the UI interface at the specified URL. However some actions require an admin user which has to be created first:
$ su - hydra
$ hydra-create-user <USER> --full-name '<NAME>' \
--email-address '<EMAIL>' --password <PASSWORD> --role admin
Afterwards you should be able to log by clicking on "Sign In" on the top right of the web interface using the credentials specified by hydra-crate-user
. Once you are logged in you can click "Admin -> Create Project" to configure your first project.
Creating A Simple Project And Jobset
In order to evaluate and build anything you need to crate projects that contain jobsets. Hydra supports imperative and declarative projects and many different configurations. The steps below will guide you through the required steps to creating a minimal imperative project configuration.
Creating A Project
Log in as adminstrator, click "Admin" and select "Create project". Fill the form as follows:
- Identifier:
hello
- Display name:
hello
- Description:
hello project
Click "Create project".
Creating A Jobset
After creating a project you are forwarded to the project page. Click "Actions" and choose "Create jobset". Fill the form with the following values:
- Identifier:
hello
- Nix expression:
examples/hello.nix
inhydra
- Check interval: 60
- Scheduling shares: 1
We have to add two inputs for this jobset. One for nixpkgs and one for hydra (which we are referrencing in the Nix expression above):
-
Input name:
nixpkgs
-
Type:
Git checkout
-
Value:
https://github.com/nixos/nixpkgs-channels nixos-20.03
-
Input name:
hydra
-
Type:
Git checkout
-
Value:
https://github.com/nixos/hydra
Make sure State at the top of the page is set to "Enabled" and click on "Create jobset". This concludes the creation of a jobset that evaluates ./examples/hello.nix once a minute. Clicking "Evaluations" should list the first evaluation of the newly created jobset after a brief delay.
Building And Developing
Building Hydra
You can build Hydra via nix-build
using the provided default.nix:
$ nix-build
Development Environment
You can use the provided shell.nix to get a working development environment:
$ nix-shell
$ ./bootstrap
$ configurePhase # NOTE: not ./configure
$ make
Additional Resources
- Hydra User's Guide
- Hydra on the NixOS Wiki
- hydra-cli
- Peter Simons - Hydra: Setting up your own build farm (NixOS)
License
Hydra is licensed under GPL-3.0
Icons provided free by EmojiOne.