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package distribution // import "github.com/docker/docker/api/server/router/distribution"
import (
"context"
"encoding/json"
"net/http"
"os"
"github.com/distribution/reference"
"github.com/docker/distribution"
"github.com/docker/distribution/manifest/manifestlist"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/manifest/schema2"
"github.com/docker/docker/api/server/httputils"
"github.com/docker/docker/api/types/registry"
distributionpkg "github.com/docker/docker/distribution"
"github.com/docker/docker/errdefs"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
func (s *distributionRouter) getDistributionInfo(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
if err := httputils.ParseForm(r); err != nil {
return err
}
w.Header().Set("Content-Type", "application/json")
imgName := vars["name"]
// TODO why is reference.ParseAnyReference() / reference.ParseNormalizedNamed() not using the reference.ErrTagInvalidFormat (and so on) errors?
ref, err := reference.ParseAnyReference(imgName)
if err != nil {
return errdefs.InvalidParameter(err)
}
namedRef, ok := ref.(reference.Named)
if !ok {
if _, ok := ref.(reference.Digested); ok {
// full image ID
return errors.Errorf("no manifest found for full image ID")
}
return errdefs.InvalidParameter(errors.Errorf("unknown image reference format: %s", imgName))
}
// For a search it is not an error if no auth was given. Ignore invalid
// AuthConfig to increase compatibility with the existing API.
authConfig, _ := registry.DecodeAuthConfig(r.Header.Get(registry.AuthHeader))
repos, err := s.backend.GetRepositories(ctx, namedRef, authConfig)
if err != nil {
return err
}
// Fetch the manifest; if a mirror is configured, try the mirror first,
// but continue with upstream on failure.
//
// FIXME(thaJeztah): construct "repositories" on-demand;
// GetRepositories() will attempt to connect to all endpoints (registries),
// but we may only need the first one if it contains the manifest we're
// looking for, or if the configured mirror is a pull-through mirror.
//
// Logic for this could be implemented similar to "distribution.Pull()",
// which uses the "pullEndpoints" utility to iterate over the list
// of endpoints;
//
// - https://github.com/moby/moby/blob/12c7411b6b7314bef130cd59f1c7384a7db06d0b/distribution/pull.go#L17-L31
// - https://github.com/moby/moby/blob/12c7411b6b7314bef130cd59f1c7384a7db06d0b/distribution/pull.go#L76-L152
var lastErr error
for _, repo := range repos {
distributionInspect, err := s.fetchManifest(ctx, repo, namedRef)
if err != nil {
lastErr = err
continue
}
return httputils.WriteJSON(w, http.StatusOK, distributionInspect)
}
return lastErr
}
func (s *distributionRouter) fetchManifest(ctx context.Context, distrepo distribution.Repository, namedRef reference.Named) (registry.DistributionInspect, error) {
var distributionInspect registry.DistributionInspect
if canonicalRef, ok := namedRef.(reference.Canonical); !ok {
namedRef = reference.TagNameOnly(namedRef)
taggedRef, ok := namedRef.(reference.NamedTagged)
if !ok {
return registry.DistributionInspect{}, errdefs.InvalidParameter(errors.Errorf("image reference not tagged: %s", namedRef))
}
descriptor, err := distrepo.Tags(ctx).Get(ctx, taggedRef.Tag())
if err != nil {
return registry.DistributionInspect{}, err
}
distributionInspect.Descriptor = ocispec.Descriptor{
MediaType: descriptor.MediaType,
Digest: descriptor.Digest,
Size: descriptor.Size,
}
} else {
// TODO(nishanttotla): Once manifests can be looked up as a blob, the
// descriptor should be set using blobsrvc.Stat(ctx, canonicalRef.Digest())
// instead of having to manually fill in the fields
distributionInspect.Descriptor.Digest = canonicalRef.Digest()
}
// we have a digest, so we can retrieve the manifest
mnfstsrvc, err := distrepo.Manifests(ctx)
if err != nil {
return registry.DistributionInspect{}, err
}
mnfst, err := mnfstsrvc.Get(ctx, distributionInspect.Descriptor.Digest)
if err != nil {
switch err {
case reference.ErrReferenceInvalidFormat,
reference.ErrTagInvalidFormat,
reference.ErrDigestInvalidFormat,
reference.ErrNameContainsUppercase,
reference.ErrNameEmpty,
reference.ErrNameTooLong,
reference.ErrNameNotCanonical:
return registry.DistributionInspect{}, errdefs.InvalidParameter(err)
}
return registry.DistributionInspect{}, err
}
mediaType, payload, err := mnfst.Payload()
if err != nil {
return registry.DistributionInspect{}, err
}
// update MediaType because registry might return something incorrect
distributionInspect.Descriptor.MediaType = mediaType
if distributionInspect.Descriptor.Size == 0 {
distributionInspect.Descriptor.Size = int64(len(payload))
}
// retrieve platform information depending on the type of manifest
switch mnfstObj := mnfst.(type) {
case *manifestlist.DeserializedManifestList:
for _, m := range mnfstObj.Manifests {
distributionInspect.Platforms = append(distributionInspect.Platforms, ocispec.Platform{
Architecture: m.Platform.Architecture,
OS: m.Platform.OS,
OSVersion: m.Platform.OSVersion,
OSFeatures: m.Platform.OSFeatures,
Variant: m.Platform.Variant,
})
}
case *schema2.DeserializedManifest:
blobStore := distrepo.Blobs(ctx)
configJSON, err := blobStore.Get(ctx, mnfstObj.Config.Digest)
var platform ocispec.Platform
if err == nil {
err := json.Unmarshal(configJSON, &platform)
if err == nil && (platform.OS != "" || platform.Architecture != "") {
distributionInspect.Platforms = append(distributionInspect.Platforms, platform)
}
}
case *schema1.SignedManifest:
if os.Getenv("DOCKER_ENABLE_DEPRECATED_PULL_SCHEMA_1_IMAGE") == "" {
return registry.DistributionInspect{}, distributionpkg.DeprecatedSchema1ImageError(namedRef)
}
platform := ocispec.Platform{
Architecture: mnfstObj.Architecture,
OS: "linux",
}
distributionInspect.Platforms = append(distributionInspect.Platforms, platform)
}
return distributionInspect, nil
}
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