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lxd.go
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lxd.go
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package image
import (
"context"
"fmt"
"os"
"path/filepath"
"strconv"
"time"
"github.com/canonical/lxd/shared/api"
"gopkg.in/yaml.v2"
"github.com/canonical/lxd-imagebuilder/shared"
)
// An LXDImage represents an LXD image.
type LXDImage struct {
sourceDir string
targetDir string
cacheDir string
Metadata api.ImageMetadata
definition shared.Definition
ctx context.Context
}
// NewLXDImage returns an LXDImage.
func NewLXDImage(ctx context.Context, sourceDir, targetDir, cacheDir string, definition shared.Definition) *LXDImage {
return &LXDImage{
sourceDir,
targetDir,
cacheDir,
api.ImageMetadata{
Properties: make(map[string]string),
Templates: make(map[string]*api.ImageMetadataTemplate),
},
definition,
ctx,
}
}
// Build creates an LXD image.
func (l *LXDImage) Build(unified bool, compression string, vm bool) (string, string, error) {
err := l.createMetadata()
if err != nil {
return "", "", fmt.Errorf("Failed to create metadata: %w", err)
}
file, err := os.Create(filepath.Join(l.cacheDir, "metadata.yaml"))
if err != nil {
return "", "", fmt.Errorf("Failed to create metadata.yaml: %w", err)
}
defer file.Close()
data, err := yaml.Marshal(l.Metadata)
if err != nil {
return "", "", fmt.Errorf("Failed to marshal yaml: %w", err)
}
_, err = file.Write(data)
if err != nil {
return "", "", fmt.Errorf("Failed to write metadata: %w", err)
}
paths := []string{"metadata.yaml"}
// Only include templates directory in the tarball if it's present.
info, err := os.Stat(filepath.Join(l.cacheDir, "templates"))
if err == nil && info.IsDir() {
paths = append(paths, "templates")
}
var fname string
if l.definition.Image.Name != "" {
// Use a custom name for the unified tarball.
fname, _ = shared.RenderTemplate(l.definition.Image.Name, l.definition)
} else {
// Default name for the unified tarball.
fname = "lxd"
}
rawImage := filepath.Join(l.cacheDir, fmt.Sprintf("%s.raw", fname))
qcowImage := filepath.Join(l.cacheDir, fmt.Sprintf("%s.img", fname))
if vm {
// Create compressed qcow2 image.
err = shared.RunCommand(l.ctx, nil, nil, "qemu-img", "convert", "-c", "-O", "qcow2",
rawImage,
qcowImage)
if err != nil {
return "", "", fmt.Errorf("Failed to create qcow2 image %q: %w", qcowImage, err)
}
defer os.RemoveAll(rawImage)
}
imageFile := ""
rootfsFile := ""
if unified {
targetTarball := filepath.Join(l.targetDir, fmt.Sprintf("%s.tar", fname))
if vm {
// Rename image to rootfs.img
err = os.Rename(qcowImage, filepath.Join(filepath.Dir(qcowImage), "rootfs.img"))
if err != nil {
return "", "", fmt.Errorf("Failed to rename image %q -> %q: %w", qcowImage, filepath.Join(filepath.Dir(qcowImage), "rootfs.img"), err)
}
_, err = shared.Pack(l.ctx, targetTarball, "", l.cacheDir, "rootfs.img")
} else {
// Add the rootfs to the tarball, prefix all files with "rootfs".
// We intentionally don't set any compression here, as PackUpdate (further down) cannot deal with compressed tarballs.
_, err = shared.Pack(l.ctx, targetTarball,
"", l.sourceDir, "--transform", "s,^./,rootfs/,", ".")
}
if err != nil {
return "", "", fmt.Errorf("Failed to pack tarball %q: %w", targetTarball, err)
}
defer func() {
if vm {
os.RemoveAll(qcowImage)
}
}()
// Add the metadata to the tarball which is located in the cache directory
imageFile, err = shared.PackUpdate(l.ctx, targetTarball, compression, l.cacheDir, paths...)
if err != nil {
return "", "", fmt.Errorf("Failed to add metadata to tarball %q: %w", targetTarball, err)
}
} else {
if vm {
rootfsFile = filepath.Join(l.targetDir, "disk.qcow2")
err = shared.Copy(qcowImage, rootfsFile)
} else {
rootfsFile = filepath.Join(l.targetDir, "rootfs.squashfs")
args := []string{l.sourceDir, rootfsFile, "-noappend", "-b", "1M", "-no-exports", "-no-progress", "-no-recovery"}
compression, level, parseErr := shared.ParseSquashfsCompression(compression)
if parseErr != nil {
return "", "", fmt.Errorf("Failed to parse compression level: %w", err)
}
if level != nil {
args = append(args, "-comp", compression, "-Xcompression-level", strconv.Itoa(*level))
} else {
args = append(args, "-comp", compression)
}
// Create rootfs as squashfs.
err = shared.RunCommand(l.ctx, nil, nil, "mksquashfs", args...)
}
if err != nil {
return "", "", fmt.Errorf("Failed to create squashfs or copy image: %w", err)
}
// Create metadata tarball.
imageFile, err = shared.Pack(l.ctx, filepath.Join(l.targetDir, "lxd.tar"), compression,
l.cacheDir, paths...)
if err != nil {
return "", "", fmt.Errorf("Failed to create metadata tarball: %w", err)
}
}
return imageFile, rootfsFile, nil
}
func (l *LXDImage) createMetadata() error {
var err error
l.Metadata.Architecture = l.definition.Image.Architecture
l.Metadata.CreationDate = time.Now().UTC().Unix()
l.Metadata.Properties["architecture"] = l.definition.Image.ArchitectureMapped
l.Metadata.Properties["os"] = l.definition.Image.Distribution
l.Metadata.Properties["release"] = l.definition.Image.Release
l.Metadata.Properties["variant"] = l.definition.Image.Variant
l.Metadata.Properties["serial"] = l.definition.Image.Serial
l.Metadata.Properties["description"], err = shared.RenderTemplate(
l.definition.Image.Description, l.definition)
if err != nil {
return fmt.Errorf("Failed to render template: %w", err)
}
l.Metadata.Properties["name"], err = shared.RenderTemplate(
l.definition.Image.Name, l.definition)
if err != nil {
return fmt.Errorf("Failed to render template: %w", err)
}
l.Metadata.ExpiryDate = shared.GetExpiryDate(time.Now(),
l.definition.Image.Expiry).Unix()
return nil
}