kacerrandClaude Fable 5.1
162607dfe2
Introduces internal/provider/kvm with the side-effect-free pieces of the provider: providerID format/parse, the namespaced <metadata> element that carries the GC contract, q35 domain XML over pool volumes, volume XML for overlays and raw seeds, the NoCloud seed ISO built with kdomanski/iso9660, and config defaults. All unit-tested. Step 2 of docs/plans/2026-09-04-1404-kvm-provider.md. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
package kvm
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import (
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"bytes"
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"fmt"
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"strings"
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"github.com/kdomanski/iso9660"
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)
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// seedLabel is the volume label cloud-init's NoCloud datasource looks for.
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const seedLabel = "cidata"
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// defaultVendorData is the cloud-init vendor-data shipped on every seed
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// unless the config overrides it. cloud-init merges it under the Proxy's own
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// user-data, so stock images grow a guest agent (which lets the provider
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// read the VM's IP before ARP sees traffic) without the user's cloud-init
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// having to know about it.
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const defaultVendorData = `#cloud-config
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packages:
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- qemu-guest-agent
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runcmd:
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- [systemctl, enable, --now, qemu-guest-agent]
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`
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// buildSeedISO renders a NoCloud seed: user-data verbatim, vendor-data as
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// given, and a meta-data whose instance-id is the deterministic VM name, so a
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// re-created seed for the same name is byte-identical and cloud-init never
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// mistakes a reboot for a new instance.
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func buildSeedISO(name, userData, vendorData string) ([]byte, error) {
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w, err := iso9660.NewWriter()
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if err != nil {
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return nil, fmt.Errorf("creating iso writer: %w", err)
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}
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defer w.Cleanup() //nolint:errcheck // temp-dir cleanup; nothing to do on failure
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files := []struct{ name, body string }{
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{"user-data", userData},
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{"meta-data", fmt.Sprintf("instance-id: %s\nlocal-hostname: %s\n", name, name)},
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{"vendor-data", vendorData},
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}
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for _, f := range files {
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if err := w.AddFile(strings.NewReader(f.body), f.name); err != nil {
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return nil, fmt.Errorf("adding %s to seed iso: %w", f.name, err)
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}
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}
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var buf bytes.Buffer
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if err := w.WriteTo(&buf, seedLabel); err != nil {
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return nil, fmt.Errorf("writing seed iso: %w", err)
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}
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return buf.Bytes(), nil
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}
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