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Merge pull request #833 from dwillist/642_inspect_buildpack
implement inspect-buildpack command
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19 changes: 19 additions & 0 deletions
19
acceptance/testdata/pack_fixtures/inspect_buildpack_output.txt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| Inspecting buildpack: '{{ .buildpack_name }}' | ||
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| {{ .buildpack_source }}: | ||
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| Stacks: | ||
| ID: pack.test.stack | ||
| Mixins: | ||
| (none) | ||
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| Buildpacks: | ||
| ID VERSION HOMEPAGE | ||
| simple/layers simple-layers-version | ||
| simple/layers/parent simple-layers-parent-version | ||
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| Detection Order: | ||
| └ Group #1: | ||
| └ simple/layers/parent@simple-layers-parent-version | ||
| └ Group #1: | ||
| └ simple/layers@simple-layers-version |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| package pack | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "sort" | ||
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| v1 "github.com/opencontainers/image-spec/specs-go/v1" | ||
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| "github.com/buildpacks/pack/internal/style" | ||
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| "github.com/buildpacks/pack/config" | ||
| "github.com/buildpacks/pack/internal/buildpack" | ||
| "github.com/buildpacks/pack/internal/buildpackage" | ||
| "github.com/buildpacks/pack/internal/dist" | ||
| ) | ||
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| type BuildpackInfo struct { | ||
| BuildpackMetadata buildpackage.Metadata | ||
| Buildpacks []dist.BuildpackInfo | ||
| Order dist.Order | ||
| BuildpackLayers dist.BuildpackLayers | ||
| Location buildpack.LocatorType | ||
| } | ||
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| type InspectBuildpackOptions struct { | ||
| BuildpackName string | ||
| Daemon bool | ||
| Registry string | ||
| } | ||
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| type ImgWrapper struct { | ||
| v1.ImageConfig | ||
| } | ||
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| func (iw ImgWrapper) Label(name string) (string, error) { | ||
| return iw.Labels[name], nil | ||
| } | ||
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| // Must return an BuildpackNotFoundError | ||
| func (c *Client) InspectBuildpack(opts InspectBuildpackOptions) (*BuildpackInfo, error) { | ||
| locatorType, err := buildpack.GetLocatorType(opts.BuildpackName, []dist.BuildpackInfo{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var layersMd dist.BuildpackLayers | ||
| var buildpackMd buildpackage.Metadata | ||
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| switch locatorType { | ||
| case buildpack.RegistryLocator: | ||
| buildpackMd, layersMd, err = metadataFromRegistry(c, opts.BuildpackName, opts.Registry) | ||
| case buildpack.PackageLocator: | ||
| buildpackMd, layersMd, err = metadataFromImage(c, opts.BuildpackName, opts.Daemon) | ||
| case buildpack.URILocator: | ||
| buildpackMd, layersMd, err = metadataFromArchive(c.downloader, opts.BuildpackName) | ||
| default: | ||
| return nil, fmt.Errorf("unable to handle locator %q: for buildpack %q", locatorType, opts.BuildpackName) | ||
| } | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return &BuildpackInfo{ | ||
| BuildpackMetadata: buildpackMd, | ||
| BuildpackLayers: layersMd, | ||
| Order: extractOrder(buildpackMd), | ||
| Buildpacks: extractBuildpacks(layersMd), | ||
| Location: locatorType, | ||
| }, nil | ||
| } | ||
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| func metadataFromRegistry(client *Client, name, registry string) (buildpackMd buildpackage.Metadata, layersMd dist.BuildpackLayers, err error) { | ||
| registryCache, err := client.getRegistry(client.logger, registry) | ||
| if err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("invalid registry %s: %q", registry, err) | ||
| } | ||
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| registryBp, err := registryCache.LocateBuildpack(name) | ||
| if err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("unable to find %s in registry: %q", style.Symbol(name), err) | ||
| } | ||
| buildpackMd, layersMd, err = metadataFromImage(client, registryBp.Address, false) | ||
| if err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("error pulling registry specified image: %s", err) | ||
| } | ||
| return buildpackMd, layersMd, nil | ||
| } | ||
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| func metadataFromArchive(downloader Downloader, path string) (buildpackMd buildpackage.Metadata, layersMd dist.BuildpackLayers, err error) { | ||
| // open archive, read it as an image and get all metadata. | ||
| // This looks like a prime candidate to be added to imgutil. | ||
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| imgBlob, err := downloader.Download(context.Background(), path) | ||
| if err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("unable to download archive: %q", err) | ||
| //return buildpackMd, layersMd, err | ||
| } | ||
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| config, err := buildpackage.ConfigFromOCILayoutBlob(imgBlob) | ||
| if err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("unable to fetch config from buildpack blob: %q", err) | ||
| } | ||
| wrapper := ImgWrapper{config} | ||
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| if _, err := dist.GetLabel(wrapper, dist.BuildpackLayersLabel, &layersMd); err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, err | ||
| } | ||
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| if _, err := dist.GetLabel(wrapper, buildpackage.MetadataLabel, &buildpackMd); err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, err | ||
| } | ||
| return buildpackMd, layersMd, nil | ||
| } | ||
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| func metadataFromImage(client *Client, name string, daemon bool) (buildpackMd buildpackage.Metadata, layersMd dist.BuildpackLayers, err error) { | ||
| img, err := client.imageFetcher.Fetch(context.Background(), name, daemon, config.PullNever) | ||
| if err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, err | ||
| } | ||
| if _, err := dist.GetLabel(img, dist.BuildpackLayersLabel, &layersMd); err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("unable to get image label %s: %q", dist.BuildpackLayersLabel, err) | ||
| } | ||
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| if _, err := dist.GetLabel(img, buildpackage.MetadataLabel, &buildpackMd); err != nil { | ||
| return buildpackage.Metadata{}, dist.BuildpackLayers{}, fmt.Errorf("unable to get image label %s: %q", buildpackage.MetadataLabel, err) | ||
| } | ||
| return buildpackMd, layersMd, nil | ||
| } | ||
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| func extractOrder(buildpackMd buildpackage.Metadata) dist.Order { | ||
| return dist.Order{ | ||
| { | ||
| Group: []dist.BuildpackRef{ | ||
| { | ||
| BuildpackInfo: buildpackMd.BuildpackInfo, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| } | ||
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| func extractBuildpacks(layersMd dist.BuildpackLayers) []dist.BuildpackInfo { | ||
| result := []dist.BuildpackInfo{} | ||
| buildpackSet := map[dist.BuildpackInfo]bool{} | ||
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| for buildpackID, buildpackMap := range layersMd { | ||
| for version, layerInfo := range buildpackMap { | ||
| bp := dist.BuildpackInfo{ | ||
| ID: buildpackID, | ||
| Version: version, | ||
| Homepage: layerInfo.Homepage, | ||
| } | ||
| buildpackSet[bp] = true | ||
| } | ||
| } | ||
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| for currentBuildpack := range buildpackSet { | ||
| result = append(result, currentBuildpack) | ||
| } | ||
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| sort.Slice(result, func(i int, j int) bool { | ||
| switch { | ||
| case result[i].ID < result[j].ID: | ||
| return true | ||
| case result[i].ID == result[j].ID: | ||
| return result[i].Version < result[j].Version | ||
| default: | ||
| return false | ||
| } | ||
| }) | ||
| return result | ||
| } |
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