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package main
import (
"archive/tar"
"bufio"
"fmt"
"io"
"os"
"os/exec"
"time"
"github.com/spf13/cobra"
yaml "gopkg.in/yaml.v2"
cli "github.com/lxc/incus/v6/internal/cmd"
"github.com/lxc/incus/v6/shared/api"
"github.com/lxc/incus/v6/shared/ask"
"github.com/lxc/incus/v6/shared/osarch"
)
type cmdGenerateMetadata struct {
global *cmdGlobal
}
// Command generates the command definition.
func (c *cmdGenerateMetadata) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = "generate-metadata <path>"
cmd.Short = "Generate a metadata tarball"
cmd.Long = cli.FormatSection("Description",
`Generate a metadata tarball
This command produces an incus.tar.xz tarball for use with an existing QCOW2 or squashfs disk image.
This command will prompt for all of the metadata tarball fields:
- Operating system name
- Release
- Variant
- Architecture
- Description
`)
cmd.RunE = c.Run
return cmd
}
// Run runs the actual command logic.
func (c *cmdGenerateMetadata) Run(cmd *cobra.Command, args []string) error {
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 1, 1)
if exit {
return err
}
// Setup asker.
asker := ask.NewAsker(bufio.NewReader(os.Stdin))
// Create the tarball.
metaFile, err := os.Create(args[0])
if err != nil {
return err
}
defer metaFile.Close()
// Generate the metadata.
timestamp := time.Now().UTC()
metadata := api.ImageMetadata{
Properties: map[string]string{},
CreationDate: timestamp.Unix(),
}
// Question - os
metaOS, err := asker.AskString("Operating system name: ", "", nil)
if err != nil {
return err
}
metadata.Properties["os"] = metaOS
// Question - release
metaRelease, err := asker.AskString("Release name: ", "", nil)
if err != nil {
return err
}
metadata.Properties["release"] = metaRelease
// Question - variant
metaVariant, err := asker.AskString("Variant name [default=\"default\"]: ", "default", nil)
if err != nil {
return err
}
metadata.Properties["variant"] = metaVariant
// Question - architecture
var incusArch string
metaArchitecture, err := asker.AskString("Architecture name: ", "", func(value string) error {
id, err := osarch.ArchitectureId(value)
if err != nil {
return err
}
incusArch, err = osarch.ArchitectureName(id)
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
metadata.Properties["architecture"] = metaArchitecture
metadata.Architecture = incusArch
// Question - description
defaultDescription := fmt.Sprintf("%s %s (%s) (%s) (%s)", metaOS, metaRelease, metaVariant, metaArchitecture, timestamp.Format("200601021504"))
metaDescription, err := asker.AskString(fmt.Sprintf("Description [default=\"%s\"]: ", defaultDescription), defaultDescription, nil)
if err != nil {
return err
}
metadata.Properties["description"] = metaDescription
// Generate YAML.
body, err := yaml.Marshal(&metadata)
if err != nil {
return err
}
// Prepare the tarball.
tarPipeReader, tarPipeWriter := io.Pipe()
tarWriter := tar.NewWriter(tarPipeWriter)
// Compress the tarball.
chDone := make(chan error)
go func() {
cmd := exec.Command("xz", "-9", "-c")
cmd.Stdin = tarPipeReader
cmd.Stdout = metaFile
err := cmd.Run()
chDone <- err
}()
// Add metadata.yaml.
hdr := &tar.Header{
Name: "metadata.yaml",
Size: int64(len(body)),
Mode: 0o644,
Uname: "root",
Gname: "root",
ModTime: time.Now(),
}
err = tarWriter.WriteHeader(hdr)
if err != nil {
return err
}
_, err = tarWriter.Write(body)
if err != nil {
return err
}
// Close the tarball.
err = tarWriter.Close()
if err != nil {
return err
}
err = tarPipeWriter.Close()
if err != nil {
return err
}
err = <-chDone
if err != nil {
return err
}
return nil
}
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