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add --blobs-to-disk to 'crane registry serve' (#1731)
* add --blobs-to-disk to 'crane registry serve' Signed-off-by: Jason Hall <jason@chainguard.dev> * add tests Signed-off-by: Jason Hall <jason@chainguard.dev> * mark flag hidden Signed-off-by: Jason Hall <jason@chainguard.dev> * tasty boilerplate Signed-off-by: Jason Hall <jason@chainguard.dev> * boilerplate mmm Signed-off-by: Jason Hall <jason@chainguard.dev> --------- Signed-off-by: Jason Hall <jason@chainguard.dev>
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// Copyright 2023 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 registry | ||
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import ( | ||
"context" | ||
"errors" | ||
"io" | ||
"os" | ||
"path/filepath" | ||
"sync" | ||
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v1 "github.com/google/go-containerregistry/pkg/v1" | ||
) | ||
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type diskHandler struct { | ||
dir string | ||
lock sync.Mutex | ||
} | ||
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func NewDiskBlobHandler(dir string) BlobHandler { return &diskHandler{dir: dir} } | ||
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func (m *diskHandler) Stat(_ context.Context, _ string, h v1.Hash) (int64, error) { | ||
m.lock.Lock() | ||
defer m.lock.Unlock() | ||
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fi, err := os.Stat(filepath.Join(m.dir, h.String())) | ||
if errors.Is(err, os.ErrNotExist) { | ||
return 0, errNotFound | ||
} else if err != nil { | ||
return 0, err | ||
} | ||
return fi.Size(), nil | ||
} | ||
func (m *diskHandler) Get(_ context.Context, _ string, h v1.Hash) (io.ReadCloser, error) { | ||
m.lock.Lock() | ||
defer m.lock.Unlock() | ||
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return os.Open(filepath.Join(m.dir, h.String())) | ||
} | ||
func (m *diskHandler) Put(_ context.Context, _ string, h v1.Hash, rc io.ReadCloser) error { | ||
m.lock.Lock() | ||
defer m.lock.Unlock() | ||
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f, err := os.Create(filepath.Join(m.dir, h.String())) | ||
if err != nil { | ||
return err | ||
} | ||
defer f.Close() | ||
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if _, err := io.Copy(f, rc); err != nil { | ||
return err | ||
} | ||
return nil | ||
} | ||
func (m *diskHandler) Delete(_ context.Context, _ string, h v1.Hash) error { | ||
m.lock.Lock() | ||
defer m.lock.Unlock() | ||
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return os.Remove(filepath.Join(m.dir, h.String())) | ||
} |
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@@ -0,0 +1,83 @@ | ||
// Copyright 2023 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 registry_test | ||
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import ( | ||
"net/http/httptest" | ||
"os" | ||
"path/filepath" | ||
"strings" | ||
"testing" | ||
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"github.com/google/go-containerregistry/pkg/name" | ||
"github.com/google/go-containerregistry/pkg/registry" | ||
"github.com/google/go-containerregistry/pkg/v1/random" | ||
"github.com/google/go-containerregistry/pkg/v1/remote" | ||
"github.com/google/go-containerregistry/pkg/v1/validate" | ||
) | ||
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func TestDiskPush(t *testing.T) { | ||
dir := t.TempDir() | ||
reg := registry.New(registry.WithBlobHandler(registry.NewDiskBlobHandler(dir))) | ||
srv := httptest.NewServer(reg) | ||
defer srv.Close() | ||
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ref, err := name.ParseReference(strings.TrimPrefix(srv.URL, "http://") + "/foo/bar:latest") | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
img, err := random.Image(1024, 5) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if err := remote.Write(ref, img); err != nil { | ||
t.Fatalf("remote.Write: %v", err) | ||
} | ||
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// Test we can read and validate the image. | ||
if _, err := remote.Image(ref); err != nil { | ||
t.Fatalf("remote.Image: %v", err) | ||
} | ||
if err := validate.Image(img); err != nil { | ||
t.Fatalf("validate.Image: %v", err) | ||
} | ||
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// Collect the layer SHAs we expect to find. | ||
want := map[string]bool{} | ||
if h, err := img.ConfigName(); err != nil { | ||
t.Fatal(err) | ||
} else { | ||
want[h.String()] = true | ||
} | ||
ls, err := img.Layers() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
for _, l := range ls { | ||
if h, err := l.Digest(); err != nil { | ||
t.Fatal(err) | ||
} else { | ||
want[h.String()] = true | ||
} | ||
} | ||
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// Test the blobs are there on disk. | ||
for dig := range want { | ||
if _, err := os.Stat(filepath.Join(dir, dig)); err != nil { | ||
t.Fatalf("os.Stat(%s): %v", dig, err) | ||
} | ||
t.Logf("Found %s", dig) | ||
} | ||
} |
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