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feat(ko): GCB remote builds for ko builder
Enables remote builds on Google Cloud Build when using the Skaffold `ko` builder. Since Skaffold embeds ko as a module, the Cloud Build step uses the `skaffold` binary to build and push the image. This means that we don't need to create and maintain a separate `ko` builder image. Tracking: GoogleContainerTools#7131 Related: GoogleContainerTools#7258
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| /* | ||
| Copyright 2022 The Skaffold Authors | ||
| 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. | ||
| */ | ||
|
|
||
| package gcb | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "google.golang.org/api/cloudbuild/v1" | ||
|
|
||
| "github.com/GoogleContainerTools/skaffold/pkg/skaffold/output/log" | ||
| "github.com/GoogleContainerTools/skaffold/pkg/skaffold/platform" | ||
| "github.com/GoogleContainerTools/skaffold/pkg/skaffold/schema/latest" | ||
| schema "github.com/GoogleContainerTools/skaffold/pkg/skaffold/schema/v2beta28" | ||
| "github.com/GoogleContainerTools/skaffold/pkg/skaffold/yaml" | ||
| ) | ||
|
|
||
| // koBuildSpec creates a Cloud Build configuration using the `ko` builder. | ||
| // | ||
| // Because Skaffold embeds ko as a library, the `skaffold` binary builds the container image on Cloud Build. | ||
| // | ||
| // The method uses the artifact input argument to generate a Skaffold Config manifest. | ||
| func (b *Builder) koBuildSpec(ctx context.Context, artifact *latest.Artifact, tag string, platforms platform.Matcher) (cloudbuild.Build, error) { | ||
| imageName, imageTag := splitImageNameAndTag(tag) | ||
| insecureRegistries := getKeys(b.cfg.GetInsecureRegistries()) | ||
| skaffoldConfig := createSkaffoldConfig(artifact, imageName, platforms.Array(), insecureRegistries) | ||
| skaffoldYaml, err := yaml.Marshal(skaffoldConfig) | ||
| if err != nil { | ||
| return cloudbuild.Build{}, fmt.Errorf("marshalling Skaffold Config YAML for %s: %w", tag, err) | ||
| } | ||
| log.Entry(ctx).Debugf("Skaffold config for Cloud Build:\n%s\n", skaffoldYaml) | ||
| verbosity := log.GetLevel().String() | ||
| return cloudBuildConfig(b.KoImage, skaffoldYaml, imageTag, verbosity, artifact.KoArtifact.Env...), nil | ||
| } | ||
|
|
||
| func splitImageNameAndTag(imageNameWithTag string) (string, string) { | ||
| nameAndTag := strings.Split(imageNameWithTag, ":") | ||
| imageName := nameAndTag[0] | ||
| imageTag := "latest" | ||
| if len(nameAndTag) > 1 { | ||
| imageTag = nameAndTag[1] | ||
| } | ||
| return imageName, imageTag | ||
| } | ||
|
|
||
| func getKeys(in map[string]bool) []string { | ||
| var keys []string | ||
| for v := range in { | ||
| keys = append(keys, v) | ||
| } | ||
| return keys | ||
| } | ||
|
|
||
| // createSkaffoldConfig creates a Skaffold Config manifest for use in a build step on Cloud Build. | ||
| // | ||
| // The manifest uses a specific schema version that is known to be supported by a public Skaffold image on GCR/AR. | ||
| // The schema version must be a version supported by a public Skaffold image. | ||
| // The latest schema version is not used for two reasons: | ||
| // | ||
| // 1. There could be a mismatch between the versions of Skaffold used locally and on Cloud Build. | ||
| // | ||
| // For instance, a team could choose to use an LTS image for builds on Cloud Build. | ||
| // | ||
| // 2. The local version of Skaffold may not be available as a public image on GCR/AR. | ||
| // | ||
| // The manifest does not include artifact fields that are irrelevant for a remote build, such as Dependencies, LifecycleHooks, and Sync. | ||
| func createSkaffoldConfig(artifact *latest.Artifact, imageName string, platforms []string, insecureRegistries []string) *schema.SkaffoldConfig { | ||
| return &schema.SkaffoldConfig{ | ||
| APIVersion: schema.Version, | ||
| Kind: "Config", | ||
| Pipeline: schema.Pipeline{ | ||
| Build: schema.BuildConfig{ | ||
| Artifacts: []*schema.Artifact{{ | ||
| // Replace `ImageName` since we need the fully resolved name (with the Skaffold default repo). | ||
| ImageName: imageName, | ||
| // Copy values from the `artifact` function argument. | ||
| ArtifactType: schema.ArtifactType{ | ||
| KoArtifact: &schema.KoArtifact{ | ||
| BaseImage: artifact.KoArtifact.BaseImage, | ||
| Dir: artifact.KoArtifact.Dir, | ||
| Env: artifact.KoArtifact.Env, | ||
| Flags: artifact.KoArtifact.Flags, | ||
| Labels: artifact.KoArtifact.Labels, | ||
| Ldflags: artifact.KoArtifact.Ldflags, | ||
| Main: artifact.KoArtifact.Main, | ||
| }, | ||
| }, | ||
| Platforms: artifact.Platforms, // platforms defined for the artifact | ||
| Workspace: artifact.Workspace, | ||
| }}, | ||
| InsecureRegistries: insecureRegistries, | ||
| Platforms: platforms, // platforms provided via command-line flag, or envvar | ||
| }, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // cloudBuildConfig creates a single step build configuraration using the provided image and Skaffold config. | ||
| // | ||
| // The build step writes out the generated Skaffold Config manifest to a temporary file. | ||
| // Skaffold uses this Config to build and push the image. | ||
| func cloudBuildConfig(koImage string, skaffoldYaml []byte, imageTag string, verbosity string, env ...string) cloudbuild.Build { | ||
| return cloudbuild.Build{ | ||
| Steps: []*cloudbuild.BuildStep{{ | ||
| Name: koImage, | ||
| Entrypoint: "sh", | ||
| Args: []string{"-c", strings.Join( | ||
| []string{ | ||
| "skaffoldConfigFile=$(mktemp)", | ||
| // here document with quoted end marker to ensure no subsitution or expansion | ||
| fmt.Sprintf("cat << 'EOF' > $skaffoldConfigFile\n%s\nEOF", skaffoldYaml), | ||
| fmt.Sprintf("skaffold build --filename $skaffoldConfigFile --tag %s --verbosity %s", imageTag, verbosity), | ||
| }, | ||
| "\n", | ||
| )}, | ||
| Env: skaffoldGCBEnv(env...), | ||
| }}, | ||
| } | ||
| } | ||
|
|
||
| func skaffoldGCBEnv(env ...string) []string { | ||
| defaultEnv := []string{ | ||
| "SKAFFOLD_DETECT_MINIKUBE=false", | ||
| "SKAFFOLD_INTERACTIVE=false", | ||
| "SKAFFOLD_UPDATE_CHECK=false", | ||
| } | ||
| return append(defaultEnv, env...) | ||
| } |
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