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Complete guide covering KDL spec language, composability (base/include/profiles), distro support (OmniOS primary, Ubuntu secondary), output formats (QCOW2/OCI/tar), architecture, CLI reference, and migration guides from omnios-image-builder and Packer.
314 lines
13 KiB
HTML
314 lines
13 KiB
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<main>
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<h1 id="spec-overview"><a class="header" href="#spec-overview">Spec Overview</a></h1>
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<p>Forger uses <a href="https://kdl.dev/">KDL</a> (KDL Document Language) as its specification format. KDL is a node-based document language that's more expressive than TOML or JSON while being more readable than YAML.</p>
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<h2 id="why-kdl"><a class="header" href="#why-kdl">Why KDL?</a></h2>
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<ul>
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<li><strong>Node-based</strong>: natural fit for declaring image components (packages, files, targets)</li>
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<li><strong>Arguments and properties</strong>: nodes can have positional arguments and named properties on the same line</li>
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<li><strong>Children blocks</strong>: nested structure without deep indentation</li>
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<li><strong>Type annotations</strong>: optional type safety</li>
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<li><strong>Comments</strong>: <code>//</code> line comments and <code>/* */</code> block comments</li>
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</ul>
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<h2 id="spec-file-structure"><a class="header" href="#spec-file-structure">Spec File Structure</a></h2>
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<p>A complete spec file has these top-level sections:</p>
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<pre><code class="language-kdl">// Identity
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metadata name="my-image" version="1.0.0" description="What this image is"
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// Which OS (omit for OmniOS default)
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distro "ubuntu-22.04"
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// Composability
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base "path/to/parent.kdl"
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include "path/to/shared-steps.kdl"
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// Package sources
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repositories {
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// IPS publishers or APT mirrors
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}
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// IPS-specific
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incorporation "entire"
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variants { /* ... */ }
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certificates { /* ... */ }
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// What to install
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packages {
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package "pkg-name"
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}
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// Files and directories to place
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overlays {
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// file, ensure-dir, ensure-symlink, shadow, devfsadm, remove-files
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}
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// Users and system setup
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customization {
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user "username"
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}
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// Builder VM config (optional)
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builder {
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image "oci://..."
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vcpus 4
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memory 4096
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}
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// What to produce
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target "name" kind="qcow2" {
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// target-specific settings
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}
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</code></pre>
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<p>All sections are optional except that you need at least one <code>target</code> to build anything.</p>
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<h2 id="file-resolution"><a class="header" href="#file-resolution">File Resolution</a></h2>
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<p>Paths in <code>base</code>, <code>include</code>, and overlay <code>source</code> fields are resolved relative to the spec file's directory. This means you can organize specs and their supporting files together:</p>
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<pre><code>images/
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omnios-base.kdl
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omnios-disk.kdl # base "omnios-base.kdl"
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common.kdl
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devfs.kdl
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files/
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etc/
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hosts
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resolv.conf
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sshd_config
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omniosce-ca.cert.pem
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</code></pre>
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<h2 id="validation"><a class="header" href="#validation">Validation</a></h2>
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<p>Always validate before building:</p>
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<pre><code class="language-bash">forger validate --spec my-image.kdl
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</code></pre>
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<p>This checks:</p>
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<ul>
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<li>KDL syntax correctness</li>
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<li>Schema conformance (required fields, valid types)</li>
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<li>Include/base resolution (files exist, no circular references)</li>
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</ul>
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