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support building from a scratch image
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // Copyright 2023 Google LLC All Rights Reserved. | ||
|
Check failure on line 1 in pkg/build/scratch.go
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| // | ||
| // 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 build | ||
|
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| import ( | ||
| "fmt" | ||
|
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| v1 "github.com/google/go-containerregistry/pkg/v1" | ||
| "github.com/google/go-containerregistry/pkg/v1/empty" | ||
| "github.com/google/go-containerregistry/pkg/v1/mutate" | ||
| "github.com/google/go-containerregistry/pkg/v1/types" | ||
| ) | ||
|
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| // ScratchImage returns a scratch image manifest with scratch images for each of the specified platforms | ||
| func ScratchImage(platforms []string) (Result, error) { | ||
| var manifests []mutate.IndexAddendum | ||
| for _, pf := range platforms { | ||
| if pf == "all" { | ||
| return nil, fmt.Errorf("'all' is not supported for building a scratch image, the platform list must be provided") | ||
| } | ||
| p, err := v1.ParsePlatform(pf) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| img, err := mutate.ConfigFile(empty.Image, &v1.ConfigFile{ | ||
| RootFS: v1.RootFS{ | ||
| // Some clients check this. | ||
| Type: "layers", | ||
| }, | ||
| Architecture: p.Architecture, | ||
| OS: p.OS, | ||
| Variant: p.Variant, | ||
| OSVersion: p.OSVersion, | ||
| OSFeatures: p.OSFeatures, | ||
| }, | ||
| ) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("setting config file on empty image, %w", err) | ||
| } | ||
| manifests = append(manifests, mutate.IndexAddendum{ | ||
| Add: img, | ||
| Descriptor: v1.Descriptor{ | ||
| Platform: p, | ||
| }, | ||
| }) | ||
| } | ||
| idx := mutate.IndexMediaType(empty.Index, types.OCIImageIndex) | ||
| idx = mutate.AppendManifests(idx, manifests...) | ||
| return idx, nil | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| // Copyright 2023 Google LLC All Rights Reserved. | ||
|
Check failure on line 1 in pkg/build/scratch_test.go
|
||
| // | ||
| // 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 build | ||
|
|
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| import ( | ||
| "testing" | ||
|
|
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| v1 "github.com/google/go-containerregistry/pkg/v1" | ||
| "github.com/google/go-containerregistry/pkg/v1/types" | ||
| ) | ||
|
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| func TestScratchImage(t *testing.T) { | ||
| img, err := ScratchImage([]string{"linux/s390x", "plan9/386"}) | ||
| if err != nil { | ||
| t.Fatalf("expected to create the image, %s", err) | ||
| } | ||
| mt, err := img.MediaType() | ||
| if err != nil { | ||
| t.Fatalf("expected to get a mediatype, %s", err) | ||
| } | ||
| expMT := types.OCIImageIndex | ||
| if mt != expMT { | ||
| t.Errorf("expected media type = %s, got %s", expMT, mt) | ||
| } | ||
|
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| imgIdx, ok := img.(v1.ImageIndex) | ||
| if !ok { | ||
| t.Fatalf("expected to have an image index") | ||
| } | ||
|
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| mf, err := imgIdx.IndexManifest() | ||
| if mt != expMT { | ||
| t.Errorf("expected a manifest, got %s", err) | ||
| } | ||
| if len(mf.Manifests) != 2 { | ||
| t.Fatalf("expected two manifests, got %d", len(mf.Manifests)) | ||
| } | ||
| for _, m := range mf.Manifests { | ||
| img, err := imgIdx.Image(m.Digest) | ||
| if err != nil { | ||
| t.Fatalf("expected no error when getting image for digest %s, got %s", m.Digest, err) | ||
| } | ||
| ls, err := img.Layers() | ||
| if len(ls) != 0 { | ||
| t.Errorf("expected no layers, found %d", len(ls)) | ||
| } | ||
|
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| switch m.Platform.OS { | ||
| case "linux": | ||
| if m.Platform.Architecture != "s390x" { | ||
| t.Errorf("expected arch = s390x, got %s", m.Platform.Architecture) | ||
| } | ||
| case "plan9": | ||
| if m.Platform.Architecture != "386" { | ||
| t.Errorf("expected arch = 386, got %s", m.Platform.Architecture) | ||
| } | ||
| default: | ||
| t.Errorf("unexpected OS %s", m.Platform.OS) | ||
| } | ||
| } | ||
|
|
||
| } | ||
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