Hydra, for Lix
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Nikola Knezevic fceaed2b24 Make PathInput plugin cache validity configurable
PathInput plugin keeps a cache of path evaluations. This cache is simple, and
path is not checked more than once every N seconds, where N=30. The caching is
there to avoid expensive calls to `nix-store --add`.

This change makes the validity period configurable. The main use case is
`api-test.pl` which was implemented wrong for a while, as the invocation of
`hydra-eval-jobset` would return the previous evaluation, claiming there are no
changes. The test has been fixed to check better for a new evaluation.
2020-06-04 12:26:47 +02:00
.github/workflows Add hydra OpenAPI description (#750) 2020-05-11 10:04:46 -04:00
datadog add space 2017-07-26 16:56:16 +01:00
doc Remove the "releases" feature 2020-05-06 12:39:21 +02:00
examples Extend Setup Information 2020-05-02 16:04:20 +02:00
foreman Add hydra-notify to devshell 2020-05-20 15:38:31 -04:00
src Make PathInput plugin cache validity configurable 2020-06-04 12:26:47 +02:00
tests Make PathInput plugin cache validity configurable 2020-06-04 12:26:47 +02:00
.gitignore Add runHydra shell 2020-05-15 12:37:16 +02:00
bootstrap hydra: Simplify `bootstrap'. 2011-01-14 10:52:47 +00:00
configure.ac Remove outdated email address 2020-03-31 12:58:24 +02:00
COPYING hydra: revert license change 2010-03-29 14:16:46 +00:00
default.nix Add comment about edolstra/flake-compat 2020-05-02 18:56:30 +02:00
flake.lock flake.lock: Update 2020-05-12 16:03:29 +02:00
flake.nix Make PathInput plugin cache validity configurable 2020-06-04 12:26:47 +02:00
hydra-api.yaml Add hydra OpenAPI description (#750) 2020-05-11 10:04:46 -04:00
hydra-module.nix Merge remote-tracking branch 'origin/master' into flake 2019-09-24 19:03:18 +02:00
INSTALL hydra: use autoconf/-make 2010-09-30 14:29:15 +00:00
Makefile.am Install hydra-module.nix into $out/share/nix 2013-07-28 11:24:31 -04:00
Procfile Add hydra-notify to devshell 2020-05-20 15:38:31 -04:00
README.md README.md update 2020-05-15 13:59:36 +02:00
shell.nix Address PR comments: 2020-05-15 13:48:21 +02:00
version hydra: fix tarball build, add pre suffix to tarballs 2010-09-30 15:02:42 +00:00

Hydra

CI

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 in hydra
  • 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

Executing Hydra During Development

When working on new features or bug fixes you need to be able to run Hydra from your working copy. This can be done using foreman:

$ nix-shell
$ # hack hack
$ make
$ foreman start

Have a look at the Procfile if you want to see how the processes are being started. In order to avoid conflicts with services that might be running on your host, hydra and postgress are started on custom ports:

  • hydra-server: 63333
  • postgresql: 64444

Note that this is only ever meant as an ad-hoc way of executing Hydra during development. Please make use of the NixOS module for actually running Hydra in production.

JSON API

You can also interface with Hydra through a JSON API. The API is defined in hydra-api.yaml and you can test and explore via the swagger editor

Additional Resources

License

Hydra is licensed under GPL-3.0

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