forked from TrueCloudLab/distribution
address get manifest issue with oci. namespace; and comment descriptions
Signed-off-by: Mike Brown <brownwm@us.ibm.com>
This commit is contained in:
Mike Brown
parent
fcaffa38bc
commit
426afb3a4c
3 changed files with 9 additions and 183 deletions
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@ -61,7 +61,7 @@ func (m Manifest) References() []distribution.Descriptor {
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return references
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}
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// Target returns the target of this signed manifest.
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// Target returns the target of this manifest.
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func (m Manifest) Target() distribution.Descriptor {
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return m.Config
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}
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@ -79,7 +79,7 @@ func (m Manifest) References() []distribution.Descriptor {
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return references
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}
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// Target returns the target of this signed manifest.
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// Target returns the target of this manifest.
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func (m Manifest) Target() distribution.Descriptor {
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return m.Config
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}
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@ -111,13 +111,11 @@ func (imh *manifestHandler) GetManifest(w http.ResponseWriter, r *http.Request)
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}
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supportsOCI := supportsOCISchema || supportsOCIImageIndex
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var manifest distribution.Manifest
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if imh.Tag != "" {
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tags := imh.Repository.Tags(imh)
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var desc distribution.Descriptor
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if !supportsOCI {
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desc, err = tags.Get(imh, imh.Tag)
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} else {
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desc, err = tags.Get(imh, imh.annotatedTag(supportsOCI))
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if err != nil && supportsOCI { // in the supportsOCI case fall back to the non OCI image
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desc, err = tags.Get(imh, imh.annotatedTag(false))
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}
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if err != nil {
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@ -140,7 +138,12 @@ func (imh *manifestHandler) GetManifest(w http.ResponseWriter, r *http.Request)
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if imh.Tag != "" {
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options = append(options, distribution.WithTag(imh.annotatedTag(supportsOCI)))
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}
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var manifest distribution.Manifest
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manifest, err = manifests.Get(imh, imh.Digest, options...)
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if err != nil && supportsOCI && imh.Tag != "" { // in the supportsOCI case fall back to the non OCI image
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options = append(options[:0], distribution.WithTag(imh.annotatedTag(false)))
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manifest, err = manifests.Get(imh, imh.Digest, options...)
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}
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if err != nil {
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if _, ok := err.(distribution.ErrManifestUnknownRevision); ok {
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imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
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@ -238,183 +241,6 @@ func (imh *manifestHandler) GetManifest(w http.ResponseWriter, r *http.Request)
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w.Write(p)
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}
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// GetImageManifest fetches the image manifest from the storage backend, if it exists.
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func (imh *manifestHandler) GetImageManifest(w http.ResponseWriter, r *http.Request) {
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fmt.Printf("\n\nGetting a manifest!\n\n\n")
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supportsSchema2 := false
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supportsManifestList := false
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supportsOCISchema := false
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supportsOCIImageIndex := false
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// this parsing of Accept headers is not quite as full-featured as godoc.org's parser, but we don't care about "q=" values
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// https://github.com/golang/gddo/blob/e91d4165076d7474d20abda83f92d15c7ebc3e81/httputil/header/header.go#L165-L202
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for _, acceptHeader := range r.Header["Accept"] {
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// r.Header[...] is a slice in case the request contains the same header more than once
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// if the header isn't set, we'll get the zero value, which "range" will handle gracefully
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// we need to split each header value on "," to get the full list of "Accept" values (per RFC 2616)
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// https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
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for _, mediaType := range strings.Split(acceptHeader, ",") {
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// remove "; q=..." if present
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if i := strings.Index(mediaType, ";"); i >= 0 {
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mediaType = mediaType[:i]
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}
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// it's common (but not required) for Accept values to be space separated ("a/b, c/d, e/f")
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mediaType = strings.TrimSpace(mediaType)
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if mediaType == schema2.MediaTypeManifest {
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supportsSchema2 = true
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}
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if mediaType == manifestlist.MediaTypeManifestList {
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supportsManifestList = true
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}
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if mediaType == v1.MediaTypeImageManifest {
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supportsOCISchema = true
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}
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if mediaType == v1.MediaTypeImageIndex {
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supportsOCIImageIndex = true
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}
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}
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}
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supportsOCI := supportsOCISchema || supportsOCIImageIndex
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ctxu.GetLogger(imh).Debug("GetImageManifest")
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manifests, err := imh.Repository.Manifests(imh)
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if err != nil {
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imh.Errors = append(imh.Errors, err)
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return
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}
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var manifest distribution.Manifest
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if imh.Tag != "" {
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tags := imh.Repository.Tags(imh)
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var desc distribution.Descriptor
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if !supportsOCI {
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desc, err = tags.Get(imh, imh.Tag)
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if err != nil {
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imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
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return
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}
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} else {
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desc, err = tags.Get(imh, imh.annotatedTag(supportsOCI))
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if err != nil {
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desc, err = tags.Get(imh, imh.annotatedTag(false))
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if err != nil {
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imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
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return
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}
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}
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}
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imh.Digest = desc.Digest
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}
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if etagMatch(r, imh.Digest.String()) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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var options []distribution.ManifestServiceOption
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if imh.Tag != "" {
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options = append(options, distribution.WithTag(imh.annotatedTag(supportsOCI)))
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}
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manifest, err = manifests.Get(imh, imh.Digest, options...)
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if err != nil {
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imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
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return
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}
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schema2Manifest, isSchema2 := manifest.(*schema2.DeserializedManifest)
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manifestList, isManifestList := manifest.(*manifestlist.DeserializedManifestList)
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isAnOCIManifest := isSchema2 && (schema2Manifest.MediaType == v1.MediaTypeImageManifest)
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isAnOCIImageIndex := isManifestList && (manifestList.MediaType == v1.MediaTypeImageIndex)
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badCombinations := [][]bool{
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{isSchema2 && !isAnOCIManifest, supportsOCISchema && !supportsSchema2},
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{isManifestList && !isAnOCIImageIndex, supportsOCIImageIndex && !supportsManifestList},
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{isAnOCIManifest, !supportsOCISchema && supportsSchema2},
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{isAnOCIImageIndex, !supportsOCIImageIndex && supportsManifestList},
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}
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for i, combo := range badCombinations {
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if combo[0] && combo[1] {
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fmt.Printf("\n\nbad combo! %d\n\n\n", i)
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w.WriteHeader(http.StatusNotFound)
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return
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}
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}
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if isAnOCIManifest {
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fmt.Print("\n\nreturning OCI manifest\n\n")
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} else if isSchema2 {
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fmt.Print("\n\nreturning schema 2 manifest\n\n")
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} else {
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fmt.Print("\n\nreturning schema 1 manifest\n\n")
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}
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// Only rewrite schema2 manifests when they are being fetched by tag.
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// If they are being fetched by digest, we can't return something not
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// matching the digest.
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if imh.Tag != "" && isSchema2 && !(supportsSchema2 || supportsOCISchema) {
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// Rewrite manifest in schema1 format
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dcontext.GetLogger(imh).Infof("rewriting manifest %s in schema1 format to support old client", imh.Digest.String())
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manifest, err = imh.convertSchema2Manifest(schema2Manifest)
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if err != nil {
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return
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}
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} else if imh.Tag != "" && isManifestList && !(supportsManifestList || supportsOCIImageIndex) {
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// Rewrite manifest in schema1 format
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dcontext.GetLogger(imh).Infof("rewriting manifest list %s in schema1 format to support old client", imh.Digest.String())
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// Find the image manifest corresponding to the default
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// platform
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var manifestDigest digest.Digest
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for _, manifestDescriptor := range manifestList.Manifests {
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if manifestDescriptor.Platform.Architecture == defaultArch && manifestDescriptor.Platform.OS == defaultOS {
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manifestDigest = manifestDescriptor.Digest
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break
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}
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}
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if manifestDigest == "" {
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imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown)
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return
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}
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manifest, err = manifests.Get(imh, manifestDigest)
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if err != nil {
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if _, ok := err.(distribution.ErrManifestUnknownRevision); ok {
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imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
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} else {
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imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
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}
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return
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}
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// If necessary, convert the image manifest
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if schema2Manifest, isSchema2 := manifest.(*schema2.DeserializedManifest); isSchema2 && !supportsSchema2 {
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manifest, err = imh.convertSchema2Manifest(schema2Manifest)
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if err != nil {
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return
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}
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} else {
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imh.Digest = manifestDigest
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}
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}
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ct, p, err := manifest.Payload()
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if err != nil {
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return
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}
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w.Header().Set("Content-Type", ct)
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w.Header().Set("Content-Length", fmt.Sprint(len(p)))
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w.Header().Set("Docker-Content-Digest", imh.Digest.String())
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w.Header().Set("Etag", fmt.Sprintf(`"%s"`, imh.Digest))
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w.Write(p)
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fmt.Printf("\n\nSucceeded in getting the manifest!\n\n\n")
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}
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func (imh *manifestHandler) convertSchema2Manifest(schema2Manifest *schema2.DeserializedManifest) (distribution.Manifest, error) {
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targetDescriptor := schema2Manifest.Target()
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blobs := imh.Repository.Blobs(imh)
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