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Comprehensive docs covering CLI reference, VMFile.kdl format, architecture, library API, tutorials, and advanced topics. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
268 lines
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268 lines
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<main>
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<h1 id="error-handling"><a class="header" href="#error-handling">Error Handling</a></h1>
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<h2 id="approach"><a class="header" href="#approach">Approach</a></h2>
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<p>vm-manager uses <a href="https://docs.rs/miette">miette</a> for rich diagnostic error reporting. Every error variant includes:</p>
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<ul>
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<li>A human-readable message.</li>
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<li>A diagnostic code (e.g., <code>vm_manager::qemu::spawn_failed</code>).</li>
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<li>A <code>help</code> message telling the user what to do.</li>
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</ul>
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<p>Errors are defined with <code>#[derive(thiserror::Error, miette::Diagnostic)]</code>.</p>
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<h2 id="error-variants"><a class="header" href="#error-variants">Error Variants</a></h2>
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<div class="table-wrapper"><table><thead><tr><th>Code</th><th>Trigger</th><th>Help</th></tr></thead><tbody>
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<tr><td><code>vm_manager::qemu::spawn_failed</code></td><td>QEMU process failed to start</td><td>Ensure <code>qemu-system-x86_64</code> is installed, in PATH, and KVM is available (<code>/dev/kvm</code>)</td></tr>
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<tr><td><code>vm_manager::qemu::qmp_connect_failed</code></td><td>Can't connect to QMP socket</td><td>QEMU may have crashed before QMP socket ready; check work directory logs</td></tr>
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<tr><td><code>vm_manager::qemu::qmp_command_failed</code></td><td>QMP command returned an error</td><td>(varies)</td></tr>
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<tr><td><code>vm_manager::image::overlay_creation_failed</code></td><td>QCOW2 overlay creation failed</td><td>Ensure <code>qemu-img</code> is installed and base image exists and is readable</td></tr>
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<tr><td><code>vm_manager::network::ip_discovery_timeout</code></td><td>Guest IP not found</td><td>Guest may not have DHCP lease; check network config and cloud-init</td></tr>
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<tr><td><code>vm_manager::propolis::unreachable</code></td><td>Can't reach propolis-server</td><td>Ensure propolis-server is running and listening on expected address</td></tr>
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<tr><td><code>vm_manager::cloudinit::iso_failed</code></td><td>Seed ISO generation failed</td><td>Ensure <code>genisoimage</code> or <code>mkisofs</code> installed, or enable <code>pure-iso</code> feature</td></tr>
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<tr><td><code>vm_manager::ssh::failed</code></td><td>SSH connection or command failed</td><td>Check SSH key, guest reachability, and sshd running</td></tr>
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<tr><td><code>vm_manager::ssh::keygen_failed</code></td><td>Ed25519 key generation failed</td><td>Internal error; please report it</td></tr>
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<tr><td><code>vm_manager::image::download_failed</code></td><td>Image download failed</td><td>Check network connectivity and URL correctness</td></tr>
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<tr><td><code>vm_manager::image::format_detection_failed</code></td><td>Can't detect image format</td><td>Ensure <code>qemu-img</code> installed and file is valid disk image</td></tr>
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<tr><td><code>vm_manager::image::conversion_failed</code></td><td>Image format conversion failed</td><td>Ensure <code>qemu-img</code> installed and sufficient disk space</td></tr>
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<tr><td><code>vm_manager::vm::not_found</code></td><td>VM not in store</td><td>Run <code>vmctl list</code> to see available VMs</td></tr>
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<tr><td><code>vm_manager::vm::invalid_state</code></td><td>Operation invalid for current state</td><td>(varies)</td></tr>
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<tr><td><code>vm_manager::backend::not_available</code></td><td>Backend not supported on platform</td><td>Backend not supported on current platform</td></tr>
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<tr><td><code>vm_manager::vmfile::not_found</code></td><td>VMFile.kdl not found</td><td>Create VMFile.kdl in current directory or specify path with <code>--file</code></td></tr>
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<tr><td><code>vm_manager::vmfile::parse_failed</code></td><td>KDL syntax error</td><td>Check VMFile.kdl syntax; see https://kdl.dev</td></tr>
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<tr><td><code>vm_manager::vmfile::validation</code></td><td>VMFile validation error</td><td>(custom hint per error)</td></tr>
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<tr><td><code>vm_manager::provision::failed</code></td><td>Provisioner step failed</td><td>Check provisioner config and VM SSH reachability</td></tr>
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<tr><td><code>vm_manager::io</code></td><td>General I/O error</td><td>(transparent)</td></tr>
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</tbody></table>
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</div>
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<h2 id="type-alias"><a class="header" href="#type-alias">Type Alias</a></h2>
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<p>The library defines <code>pub type Result<T> = std::result::Result<T, VmError></code> for convenience. CLI commands return <code>miette::Result<()></code> for rich terminal output.</p>
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