kacerrandClaude Fable 5.1
7aea14fbb3
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>
79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
package kvm
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import (
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"encoding/xml"
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"fmt"
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)
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const bytesPerGiB = 1 << 30
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func overlayVolumeName(name string) string { return name + ".qcow2" }
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func seedVolumeName(name string) string { return name + "-seed.iso" }
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// volumeSpec describes a storage volume to create. A non-empty BackingPath
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// makes it a copy-on-write overlay of that file.
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type volumeSpec struct {
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Name string
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SizeBytes int64
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Format string
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BackingPath string
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BackingFormat string
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}
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func overlayVolume(name string, sizeGB int64, basePath, baseFormat string) volumeSpec {
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return volumeSpec{
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Name: overlayVolumeName(name),
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SizeBytes: sizeGB * bytesPerGiB,
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Format: formatQcow2,
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BackingPath: basePath,
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BackingFormat: baseFormat,
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}
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}
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func rawVolume(name string, sizeBytes int64) volumeSpec {
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return volumeSpec{Name: name, SizeBytes: sizeBytes, Format: formatRaw}
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}
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// buildVolumeXML renders the volume for StorageVolCreateXML. Capacity is
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// always given in bytes so no libvirt unit-suffix ambiguity (G vs GiB) can
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// creep in.
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func buildVolumeXML(v volumeSpec) (string, error) {
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x := volumeXML{
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Type: "file",
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Name: v.Name,
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Capacity: sizeXML{Unit: "bytes", Value: v.SizeBytes},
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Target: volumeTargetXML{Format: formatXML{Type: v.Format}},
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}
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if v.BackingPath != "" {
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x.BackingStore = &backingStoreXML{Path: v.BackingPath, Format: formatXML{Type: v.BackingFormat}}
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}
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out, err := xml.Marshal(x)
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if err != nil {
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return "", fmt.Errorf("marshalling volume xml: %w", err)
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}
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return string(out), nil
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}
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type volumeXML struct {
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XMLName xml.Name `xml:"volume"`
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Type string `xml:"type,attr"`
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Name string `xml:"name"`
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Capacity sizeXML `xml:"capacity"`
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Target volumeTargetXML `xml:"target"`
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BackingStore *backingStoreXML `xml:"backingStore"`
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}
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type volumeTargetXML struct {
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Format formatXML `xml:"format"`
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}
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type formatXML struct {
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Type string `xml:"type,attr"`
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}
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type backingStoreXML struct {
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Path string `xml:"path"`
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Format formatXML `xml:"format"`
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}
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