95 lines
3.0 KiB
Go
95 lines
3.0 KiB
Go
/*
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Copyright 2018 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"path/filepath"
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"strconv"
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"github.com/google/go-containerregistry/pkg/authn"
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"github.com/google/go-containerregistry/pkg/authn/k8schain"
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"github.com/google/go-containerregistry/pkg/name"
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"github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/empty"
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"github.com/google/go-containerregistry/pkg/v1/partial"
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"github.com/google/go-containerregistry/pkg/v1/remote"
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"github.com/google/go-containerregistry/pkg/v1/tarball"
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"github.com/sirupsen/logrus"
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"github.com/GoogleContainerTools/kaniko/pkg/config"
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"github.com/GoogleContainerTools/kaniko/pkg/constants"
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)
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var (
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// For testing
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retrieveRemoteImage = remoteImage
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retrieveTarImage = tarballImage
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)
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// RetrieveSourceImage returns the base image of the stage at index
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func RetrieveSourceImage(stage config.KanikoStage, buildArgs []string) (v1.Image, error) {
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currentBaseName, err := ResolveEnvironmentReplacement(stage.BaseName, buildArgs, false)
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if err != nil {
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return nil, err
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}
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// First, check if the base image is a scratch image
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if currentBaseName == constants.NoBaseImage {
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logrus.Info("No base image, nothing to extract")
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return empty.Image, nil
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}
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// Next, check if the base image of the current stage is built from a previous stage
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// If so, retrieve the image from the stored tarball
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if stage.BaseImageStoredLocally {
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return retrieveTarImage(stage.BaseImageIndex)
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}
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// Otherwise, initialize image as usual
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return retrieveRemoteImage(currentBaseName)
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}
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// RetrieveConfigFile returns the config file for an image
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func RetrieveConfigFile(sourceImage partial.WithConfigFile) (*v1.ConfigFile, error) {
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imageConfig, err := sourceImage.ConfigFile()
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if err != nil {
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return nil, err
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}
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if sourceImage == empty.Image {
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imageConfig.Config.Env = constants.ScratchEnvVars
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}
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return imageConfig, nil
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}
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func tarballImage(index int) (v1.Image, error) {
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tarPath := filepath.Join(constants.KanikoIntermediateStagesDir, strconv.Itoa(index))
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logrus.Infof("Base image from previous stage %d found, using saved tar at path %s", index, tarPath)
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return tarball.ImageFromPath(tarPath, nil)
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}
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func remoteImage(image string) (v1.Image, error) {
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logrus.Infof("Downloading base image %s", image)
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ref, err := name.ParseReference(image, name.WeakValidation)
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if err != nil {
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return nil, err
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}
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k8sc, err := k8schain.NewNoClient()
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if err != nil {
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return nil, err
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}
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kc := authn.NewMultiKeychain(authn.DefaultKeychain, k8sc)
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return remote.Image(ref, remote.WithAuthFromKeychain(kc))
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}
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