/
image.go
147 lines (133 loc) · 3.89 KB
/
image.go
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package image
import (
"context"
"fmt"
"os"
"path"
"strings"
"github.com/containerd/containerd/platforms"
"github.com/containers/image/v5/manifest"
"github.com/crazy-max/undock/internal/config"
"github.com/crazy-max/undock/internal/extractor"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"golang.org/x/sync/errgroup"
)
// Client represents an active image extractor object
type Client struct {
*extractor.Client
ctx context.Context
meta config.Meta
cli config.Cli
platform specs.Platform
logger zerolog.Logger
}
// New creates new image extractor instance
func New(ctx context.Context, meta config.Meta, cli config.Cli, platform specs.Platform) (*extractor.Client, error) {
return &extractor.Client{
Handler: &Client{
ctx: ctx,
meta: meta,
cli: cli,
platform: platform,
logger: log.With().Str("src", cli.Source).Logger(),
},
}, nil
}
// Type returns the extractor type
func (c *Client) Type() string {
return "image"
}
// Extract extracts a registry image
func (c *Client) Extract() error {
c.logger.Info().Msg("Extracting source")
manblob, cachedir, err := c.cacheSource(c.cli.Source)
if err != nil {
return errors.Wrap(err, "cannot cache source")
}
type manifestEntry struct {
platform specs.Platform
manifest *manifest.OCI1
}
var mans []manifestEntry
mtype := manifest.GuessMIMEType(manblob)
if mtype == specs.MediaTypeImageManifest {
man, err := manifest.OCI1FromManifest(manblob)
if err != nil {
return errors.Wrap(err, "cannot create OCI manifest instance from blob")
}
mans = append(mans, manifestEntry{
platform: c.platform,
manifest: man,
})
} else if mtype == specs.MediaTypeImageIndex {
ocindex, err := manifest.OCI1IndexFromManifest(manblob)
if err != nil {
return errors.Wrap(err, "cannot create OCI manifest index instance from blob")
}
for _, m := range ocindex.Manifests {
mblob, err := os.ReadFile(path.Join(cachedir, "blobs", m.Digest.Algorithm().String(), m.Digest.Hex()))
if err != nil {
return errors.Wrapf(err, "cannot read OCI manifest JSON for platform %s", platforms.Format(*m.Platform))
}
man, err := manifest.OCI1FromManifest(mblob)
if err != nil {
return errors.Wrap(err, "cannot create OCI manifest instance from blob")
}
mans = append(mans, manifestEntry{
platform: *m.Platform,
manifest: man,
})
}
}
eg, _ := errgroup.WithContext(c.ctx)
for _, mane := range mans {
func(mane manifestEntry) {
eg.Go(func() error {
dest := c.cli.Dist
if !c.cli.Wrap && len(mans) > 1 {
dest = path.Join(c.cli.Dist, fmt.Sprintf("%s_%s%s", mane.platform.OS, mane.platform.Architecture, mane.platform.Variant))
}
for _, layer := range mane.manifest.LayerInfos() {
sublogger := c.logger.With().
Str("platform", platforms.Format(mane.platform)).
Str("media-type", layer.MediaType).
Str("blob", layer.Digest.String()).Logger()
if err = extractor.ExtractBlob(path.Join(cachedir, "blobs", layer.Digest.Algorithm().String(), layer.Digest.Hex()), dest, extractor.ExtractBlobOpts{
Context: c.ctx,
Logger: sublogger,
Includes: c.cli.Includes,
}); err != nil {
return err
}
}
return nil
})
}(mane)
}
return eg.Wait()
}
//nolint:unused
func formatReference(source string) (string, string) {
scheme := sourceScheme(source)
switch scheme {
case "":
return "docker://" + source, "docker"
case "docker":
return source, scheme
default:
return strings.Replace(source, scheme+"://", scheme+":", 1), scheme
}
}
//nolint:unused
func sourceScheme(source string) string {
schemes := []string{"containers-storage", "docker", "docker-archive", "docker-daemon", "oci", "oci-archive", "ostree"}
for _, scheme := range schemes {
if strings.HasPrefix(source, scheme+"://") {
return scheme
}
}
return ""
}