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<main>
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<div class="content-wrap">
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<h1 id="continuous-integration-setup-ci"><a class="header" href="#continuous-integration-setup-ci">Continuous Integration setup (CI)</a></h1>
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<p>Traditionally, the CI build environment has to be kept in sync with the
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project. If the project needs <code>make</code> to build, the CI has to be configured to
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have it available. This can become quite tricky whenever a version requirement
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changes.</p>
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<p>With devshell, the only dependency is Nix. Once the devshell is built, all the
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dependencies are loaded into scope and automatically are in sync with the
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current code checkout.</p>
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<h2 id="general-approach"><a class="header" href="#general-approach">General approach</a></h2>
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<p>The only dependency we need installed in the CI environment is Nix.</p>
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<p>Assuming that the <code>shell.nix</code> file exists, the general approach is to build it
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with nix to get back the entrypoint script. And then executed that script with
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the commands.</p>
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<p>For example, let's say that <code>make</code> is being used to build the project.</p>
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<p>The <code>devshell.toml</code> would have it as part of its commands:</p>
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<pre><code class="language-toml">[[commands]]
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package = "gnumake"
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</code></pre>
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<p>All the CI has to do, is this: <code>nix-shell --run "$(nix-build shell.nix)/entrypoint make"</code>.</p>
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<ol>
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<li><code>$(nix-build shell.nix)/entrypoint</code> outputs a path to the entrypoint script</li>
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<li><code>nix-shell --run</code> sets the required environment variables for the entrypoint script to work.</li>
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<li>The entrypoint script is executed with <code>make</code> as an argument. It loads the
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environment.</li>
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<li>Finally make is executed in the context of the project environment, with
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all the same dependencies as the developer's.</li>
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</ol>
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<h2 id="hercules-ci"><a class="header" href="#hercules-ci">Hercules CI</a></h2>
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<p><a href="https://hercules-ci.com">Hercules CI</a> is a Nix-based continuous integration and deployment service.</p>
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<h3 id="build"><a class="header" href="#build">Build</a></h3>
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<p>If you haven't packaged your project with Nix or if a check can't run in the Nix sandbox, you can run it as an <a href="https://docs.hercules-ci.com/hercules-ci/effects/">effect</a>.</p>
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<p><code>ci.nix</code></p>
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<pre><code>let
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shell = import ./shell.nix {};
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pkgs = shell.pkgs;
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effectsSrc =
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builtins.fetchTarball "https://github.com/hercules-ci/hercules-ci-effects/archive/COMMIT_HASH.tar.gz";
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inherit (import effectsSrc { inherit pkgs; }) effects;
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in
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{
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inherit shell;
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build = effects.mkEffect {
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src = ./.;
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effectScript = ''
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go build
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'';
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inputs = [
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shell.hook
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];
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};
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}
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</code></pre>
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<p>Replace COMMIT_HASH by the latest git sha from <a href="https://github.com/hercules-ci/hercules-ci-effects/commit/master"><code>hercules-ci-effects</code></a>,
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or, if you prefer, you can bring <code>effects</code> into scope <a href="https://docs.hercules-ci.com/hercules-ci-effects/guide/import-or-pin/">using another pinning method</a>.</p>
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<h3 id="run-locally"><a class="header" href="#run-locally">Run locally</a></h3>
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<p>The <a href="https://docs.hercules-ci.com/hercules-ci-agent/hci/"><code>hci</code> command</a> is available in <code>nixos-21.05</code> and <code>nixos-unstable</code>.</p>
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<p><code>devshell.toml</code></p>
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<pre><code>[[commands]]
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package = "hci"
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</code></pre>
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<p>Use <a href="https://docs.hercules-ci.com/hercules-ci-agent/hci/"><code>hci effect run</code></a>. Following the previous example:</p>
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<pre><code class="language-console">hci effect run build --no-token
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</code></pre>
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<h3 id="shell-only"><a class="header" href="#shell-only">Shell only</a></h3>
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<p>To build the shell itself on <code>x86_64-linux</code>:</p>
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<p><code>ci.nix</code></p>
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<pre><code>{
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shell = import ./shell.nix {};
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# ... any extra Nix packages you want to build; perhaps
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# pkgs = import ./default.nix {} // { recurseForDerivations = true; };
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}
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</code></pre>
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<h3 id="system"><a class="header" href="#system"><code>system</code></a></h3>
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<p>If you build for <a href="https://docs.hercules-ci.com/hercules-ci/guides/multi-platform/">multiple systems</a>, pass <code>system</code>:</p>
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<pre><code>import ./shell.nix { inherit system; };
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</code></pre>
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<h2 id="github-actions"><a class="header" href="#github-actions">GitHub Actions</a></h2>
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<p>Add the following file to your project. Replace the <code><your build command></code>
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part with whatever is needed to build the project.</p>
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<p><code>.github/workflows/devshell.yml</code></p>
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<pre><code class="language-yaml">name: devshell
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on:
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push:
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branches:
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- master
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pull_request:
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workflow_dispatch:
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jobs:
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build:
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strategy:
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matrix:
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os: [ ubuntu-20.04, macos-latest ]
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runs-on: ${{ matrix.os }}
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steps:
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- uses: actions/checkout@v2
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- uses: cachix/install-nix-action@v12
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- uses: cachix/cachix-action@v8
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with:
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name: "<your cache here>"
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signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
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- run: |
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source "$(nix-build shell.nix)"
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<your build command>
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</code></pre>
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<h2 id="todo"><a class="header" href="#todo">TODO</a></h2>
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<p>Add more CI-specific examples.</p>
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</div>
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<div class="sidetoc">
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<nav class="pagetoc"></nav>
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</main>
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<a rel="prev" href="getting_started.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
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</a>
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