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cloudconfig.go
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cloudconfig.go
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package virter
import (
"bytes"
"fmt"
libvirt "github.com/digitalocean/go-libvirt"
"github.com/kdomanski/iso9660"
)
const templateMetaData = `instance-id: {{ .VMName }}
local-hostname: {{ .VMName }}
`
const templateUserData = `#cloud-config
disable_root: False
ssh_authorized_keys:
{{- range .SSHPublicKeys }}
- {{ . }}
{{- end }}
preserve_hostname: false
hostname: {{ .VMName }}
fqdn: {{ .VMName }}.test
`
func (v *Virter) metaData(vmName string) (string, error) {
templateData := map[string]interface{}{
"VMName": vmName,
}
return renderTemplate("meta-data", templateMetaData, templateData)
}
func (v *Virter) userData(vmName string, sshPublicKeys []string) (string, error) {
templateData := map[string]interface{}{
"VMName": vmName,
"SSHPublicKeys": sshPublicKeys,
}
return renderTemplate("user-data", templateUserData, templateData)
}
func (v *Virter) createCIData(sp libvirt.StoragePool, vmConfig VMConfig) error {
vmName := vmConfig.Name
sshPublicKeys := vmConfig.SSHPublicKeys
metaData, err := v.metaData(vmName)
if err != nil {
return err
}
userData, err := v.userData(vmName, sshPublicKeys)
if err != nil {
return err
}
files := map[string][]byte{
"meta-data": []byte(metaData),
"user-data": []byte(userData),
}
ciData, err := GenerateISO(files)
if err != nil {
return fmt.Errorf("failed to generate ISO: %w", err)
}
xml, err := v.ciDataVolumeXML(ciDataVolumeName(vmName))
if err != nil {
return err
}
sv, err := v.libvirt.StorageVolCreateXML(sp, xml, 0)
if err != nil {
return fmt.Errorf("could not create cloud-init volume: %w", err)
}
err = v.libvirt.StorageVolUpload(sv, bytes.NewReader(ciData), 0, 0, 0)
if err != nil {
return fmt.Errorf("failed to transfer cloud-init data to libvirt: %w", err)
}
return nil
}
func ciDataVolumeName(vmName string) string {
return vmName + "-cidata"
}
// GenerateISO generates a "CD-ROM" filesystem
func GenerateISO(files map[string][]byte) ([]byte, error) {
isoWriter, err := iso9660.NewWriter()
if err != nil {
return nil, err
}
defer isoWriter.Cleanup()
for name, content := range files {
if err := isoWriter.AddFile(bytes.NewReader(content), name); err != nil {
return nil, err
}
}
wab := newWriteAtBuffer(nil)
if err := isoWriter.WriteTo(wab, "cidata"); err != nil {
return nil, err
}
return wab.Bytes(), nil
}