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* Add static.NewLayer * Document that static layer contents aren't compressed * remove unnecessary comment * update copyright year
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// Copyright 2021 Google LLC All Rights Reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package static | ||
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import ( | ||
"bytes" | ||
"io" | ||
"io/ioutil" | ||
"sync" | ||
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v1 "github.com/google/go-containerregistry/pkg/v1" | ||
"github.com/google/go-containerregistry/pkg/v1/types" | ||
) | ||
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// NewLayer returns a layer containing the given bytes, with the given mediaType. | ||
// | ||
// Contents will not be compressed. | ||
func NewLayer(b []byte, mt types.MediaType) v1.Layer { | ||
return &staticLayer{b: b, mt: mt} | ||
} | ||
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type staticLayer struct { | ||
b []byte | ||
mt types.MediaType | ||
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once sync.Once | ||
h v1.Hash | ||
} | ||
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func (l *staticLayer) Digest() (v1.Hash, error) { | ||
var err error | ||
// Only calculate digest the first time we're asked. | ||
l.once.Do(func() { | ||
l.h, _, err = v1.SHA256(bytes.NewReader(l.b)) | ||
}) | ||
return l.h, err | ||
} | ||
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func (l *staticLayer) DiffID() (v1.Hash, error) { | ||
return l.Digest() | ||
} | ||
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func (l *staticLayer) Compressed() (io.ReadCloser, error) { | ||
return ioutil.NopCloser(bytes.NewReader(l.b)), nil | ||
} | ||
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func (l *staticLayer) Uncompressed() (io.ReadCloser, error) { | ||
return ioutil.NopCloser(bytes.NewReader(l.b)), nil | ||
} | ||
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func (l *staticLayer) Size() (int64, error) { | ||
return int64(len(l.b)), nil | ||
} | ||
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func (l *staticLayer) MediaType() (types.MediaType, error) { | ||
return l.mt, nil | ||
} |
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// Copyright 2021 Google LLC All Rights Reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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package static | ||
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import ( | ||
"io/ioutil" | ||
"strings" | ||
"testing" | ||
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v1 "github.com/google/go-containerregistry/pkg/v1" | ||
"github.com/google/go-containerregistry/pkg/v1/types" | ||
"github.com/google/go-containerregistry/pkg/v1/validate" | ||
) | ||
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func TestNewLayer(t *testing.T) { | ||
b := []byte(strings.Repeat(".", 10)) | ||
l := NewLayer(b, types.OCILayer) | ||
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// This does basically nothing. | ||
if err := validate.Layer(l, validate.Fast); err != nil { | ||
t.Fatal(err) | ||
} | ||
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// Digest and DiffID match, and match expectations. | ||
h, err := l.Digest() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
h2, err := l.DiffID() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if h != h2 { | ||
t.Errorf("Digest != DiffID; digest is %v, diffid is %v", h, h2) | ||
} | ||
wantDigest, err := v1.NewHash("sha256:537f3fb69ba01fc388a3a5c920c485b2873d5f327305c3dd2004d6a04451659b") | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if h != wantDigest { | ||
t.Errorf("Digest mismatch; got %v, want %v", h, wantDigest) | ||
} | ||
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sz, err := l.Size() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if sz != 10 { | ||
t.Errorf("Size mismatch; got %d, want %d", sz, 10) | ||
} | ||
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mt, err := l.MediaType() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if mt != types.OCILayer { | ||
t.Errorf("MediaType mismatch; got %v, want %v", mt, types.OCILayer) | ||
} | ||
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r, err := l.Uncompressed() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
got, err := ioutil.ReadAll(r) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if string(got) != string(b) { | ||
t.Errorf("Contents mismatch: got %q, want %q", string(got), string(b)) | ||
} | ||
} |