layer_test.go

Documentation: github.com/google/go-containerregistry/pkg/v1/remote

     1  // Copyright 2019 Google LLC All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package remote
    16  
    17  import (
    18  	"fmt"
    19  	"net/http/httptest"
    20  	"net/url"
    21  	"testing"
    22  
    23  	"github.com/google/go-containerregistry/internal/compare"
    24  	"github.com/google/go-containerregistry/pkg/name"
    25  	"github.com/google/go-containerregistry/pkg/registry"
    26  	"github.com/google/go-containerregistry/pkg/v1/empty"
    27  	"github.com/google/go-containerregistry/pkg/v1/mutate"
    28  	"github.com/google/go-containerregistry/pkg/v1/partial"
    29  	"github.com/google/go-containerregistry/pkg/v1/random"
    30  	"github.com/google/go-containerregistry/pkg/v1/types"
    31  	"github.com/google/go-containerregistry/pkg/v1/validate"
    32  )
    33  
    34  func TestRemoteLayer(t *testing.T) {
    35  	layer, err := random.Layer(1024, types.DockerLayer)
    36  	if err != nil {
    37  		t.Fatal(err)
    38  	}
    39  	digest, err := layer.Digest()
    40  	if err != nil {
    41  		t.Fatal(err)
    42  	}
    43  
    44  	// Set up a fake registry and write what we pulled to it.
    45  	// This ensures we get coverage for the remoteLayer.MediaType path.
    46  	s := httptest.NewServer(registry.New())
    47  	defer s.Close()
    48  	t.Log(s.URL)
    49  	u, err := url.Parse(s.URL)
    50  	if err != nil {
    51  		t.Fatal(err)
    52  	}
    53  	t.Log(u)
    54  	dst := fmt.Sprintf("%s/some/path@%s", u.Host, digest)
    55  	t.Log(dst)
    56  	ref, err := name.NewDigest(dst)
    57  	if err != nil {
    58  		t.Fatal(err)
    59  	}
    60  
    61  	t.Log(ref)
    62  	if err := WriteLayer(ref.Context(), layer); err != nil {
    63  		t.Fatalf("failed to WriteLayer: %v", err)
    64  	}
    65  
    66  	got, err := Layer(ref)
    67  	if err != nil {
    68  		t.Fatal(err)
    69  	}
    70  
    71  	if _, err := got.MediaType(); err != nil {
    72  		t.Errorf("reading MediaType: %v", err)
    73  	}
    74  
    75  	if err := compare.Layers(got, layer); err != nil {
    76  		t.Errorf("compare.Layers: %v", err)
    77  	}
    78  	if err := validate.Layer(got); err != nil {
    79  		t.Errorf("validate.Layer: %v", err)
    80  	}
    81  
    82  	if ok, err := partial.Exists(got); err != nil {
    83  		t.Fatal(err)
    84  	} else if got, want := ok, true; got != want {
    85  		t.Errorf("Exists() = %t != %t", got, want)
    86  	}
    87  }
    88  
    89  func TestRemoteLayerDescriptor(t *testing.T) {
    90  	layer, err := random.Layer(1024, types.DockerLayer)
    91  	if err != nil {
    92  		t.Fatal(err)
    93  	}
    94  	image, err := mutate.Append(empty.Image, mutate.Addendum{
    95  		Layer: layer,
    96  		URLs:  []string{"example.com"},
    97  	})
    98  	if err != nil {
    99  		t.Fatal(err)
   100  	}
   101  
   102  	// Set up a fake registry and write what we pulled to it.
   103  	// This ensures we get coverage for the remoteLayer.MediaType path.
   104  	s := httptest.NewServer(registry.New())
   105  	defer s.Close()
   106  	u, err := url.Parse(s.URL)
   107  	if err != nil {
   108  		t.Fatal(err)
   109  	}
   110  
   111  	dst := fmt.Sprintf("%s/some/path:tag", u.Host)
   112  	ref, err := name.ParseReference(dst)
   113  	if err != nil {
   114  		t.Fatal(err)
   115  	}
   116  
   117  	if err := Write(ref, image); err != nil {
   118  		t.Fatalf("failed to WriteLayer: %v", err)
   119  	}
   120  
   121  	pulled, err := Image(ref)
   122  	if err != nil {
   123  		t.Fatal(err)
   124  	}
   125  
   126  	layers, err := pulled.Layers()
   127  	if err != nil {
   128  		t.Fatal(err)
   129  	}
   130  
   131  	desc, err := partial.Descriptor(layers[0])
   132  	if err != nil {
   133  		t.Fatal(err)
   134  	}
   135  
   136  	if len(desc.URLs) != 1 {
   137  		t.Fatalf("expected url for layer[0]")
   138  	}
   139  
   140  	if got, want := desc.URLs[0], "example.com"; got != want {
   141  		t.Errorf("layer[0].urls[0] = %s != %s", got, want)
   142  	}
   143  	if ok, err := partial.Exists(layers[0]); err != nil {
   144  		t.Fatal(err)
   145  	} else if got, want := ok, true; got != want {
   146  		t.Errorf("Exists() = %t != %t", got, want)
   147  	}
   148  }
   149
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