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Support HEAD requests without Docker-Content-Digest header

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A statically hosted registry that responds correctly to GET with a
manifest will load the right digest (by looking at the manifest body and
calculating the digest). If the registry returns a HEAD without
`Docker-Content-Digest`, then the client Tags().Get() call will return
an empty digest.

This commit changes the client to fallback to loading the tag via GET if
the `Docker-Content-Digest` header is not set.

Signed-off-by: Clayton Coleman <ccoleman@redhat.com>
This commit is contained in:
Clayton Coleman 2017-08-25 17:15:10 -04:00
parent d9e0121fef
commit a2015272c1
No known key found for this signature in database
GPG key ID: 3D16906B4F1C5CB3
2 changed files with 63 additions and 1 deletions
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3
registry/client/repository.go
View file

@ -321,7 +321,8 @@ func (t *tags) Get(ctx context.Context, tag string) (distribution.Descriptor, er
defer resp.Body.Close()
switch {
case resp.StatusCode >= 200 && resp.StatusCode < 400:
case resp.StatusCode >= 200 && resp.StatusCode < 400 && len(resp.Header.Get("Docker-Content-Digest")) > 0:
// if the response is a success AND a Docker-Content-Digest can be retrieved from the headers
return descriptorFromResponse(resp)
default:
// if the response is an error - there will be no body to decode.

61
registry/client/repository_test.go
View file

@ -647,7 +647,38 @@ func addTestManifest(repo reference.Named, reference string, mediatype string, c
}),
},
})
}
func addTestManifestWithoutDigestHeader(repo reference.Named, reference string, mediatype string, content []byte, m *testutil.RequestResponseMap) {
*m = append(*m, testutil.RequestResponseMapping{
Request: testutil.Request{
Method: "GET",
Route: "/v2/" + repo.Name() + "/manifests/" + reference,
},
Response: testutil.Response{
StatusCode: http.StatusOK,
Body: content,
Headers: http.Header(map[string][]string{
"Content-Length": {fmt.Sprint(len(content))},
"Last-Modified": {time.Now().Add(-1 * time.Second).Format(time.ANSIC)},
"Content-Type": {mediatype},
}),
},
})
*m = append(*m, testutil.RequestResponseMapping{
Request: testutil.Request{
Method: "HEAD",
Route: "/v2/" + repo.Name() + "/manifests/" + reference,
},
Response: testutil.Response{
StatusCode: http.StatusOK,
Headers: http.Header(map[string][]string{
"Content-Length": {fmt.Sprint(len(content))},
"Last-Modified": {time.Now().Add(-1 * time.Second).Format(time.ANSIC)},
"Content-Type": {mediatype},
}),
},
})
}
func checkEqualManifest(m1, m2 *schema1.SignedManifest) error {
@ -994,6 +1025,36 @@ func TestObtainsErrorForMissingTag(t *testing.T) {
}
}
func TestObtainsManifestForTagWithoutHeaders(t *testing.T) {
repo, _ := reference.WithName("test.example.com/repo")
var m testutil.RequestResponseMap
m1, dgst, _ := newRandomSchemaV1Manifest(repo, "latest", 6)
_, pl, err := m1.Payload()
if err != nil {
t.Fatal(err)
}
addTestManifestWithoutDigestHeader(repo, "1.0.0", schema1.MediaTypeSignedManifest, pl, &m)
e, c := testServer(m)
defer c()
ctx := context.Background()
r, err := NewRepository(ctx, repo, e, nil)
if err != nil {
t.Fatal(err)
}
tagService := r.Tags(ctx)
desc, err := tagService.Get(ctx, "1.0.0")
if err != nil {
t.Fatalf("Expected no error")
}
if desc.Digest != dgst {
t.Fatalf("Unexpected digest")
}
}
func TestManifestTagsPaginated(t *testing.T) {
s := httptest.NewServer(http.NotFoundHandler())
defer s.Close()