132 lines
3.8 KiB
Go
132 lines
3.8 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 cmd
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import (
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"github.com/GoogleCloudPlatform/k8s-container-builder/pkg/commands"
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"github.com/GoogleCloudPlatform/k8s-container-builder/pkg/constants"
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"github.com/GoogleCloudPlatform/k8s-container-builder/pkg/dockerfile"
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"github.com/GoogleCloudPlatform/k8s-container-builder/pkg/image"
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"github.com/GoogleCloudPlatform/k8s-container-builder/pkg/snapshot"
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"github.com/GoogleCloudPlatform/k8s-container-builder/pkg/util"
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"github.com/sirupsen/logrus"
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"github.com/spf13/cobra"
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"io/ioutil"
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"os"
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)
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var (
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dockerfilePath string
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destination string
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srcContext string
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logLevel string
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)
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func init() {
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RootCmd.PersistentFlags().StringVarP(&dockerfilePath, "dockerfile", "f", "/workspace/Dockerfile", "Path to the dockerfile to be built.")
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RootCmd.PersistentFlags().StringVarP(&srcContext, "context", "c", "", "Path to the dockerfile build context.")
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RootCmd.PersistentFlags().StringVarP(&destination, "destination", "d", "", "Registry the final image should be pushed to (ex: gcr.io/test/example:latest)")
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RootCmd.PersistentFlags().StringVarP(&logLevel, "verbosity", "v", constants.DefaultLogLevel, "Log level (debug, info, warn, error, fatal, panic")
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}
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var RootCmd = &cobra.Command{
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Use: "executor",
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PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
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return util.SetLogLevel(logLevel)
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},
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Run: func(cmd *cobra.Command, args []string) {
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if err := execute(); err != nil {
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logrus.Error(err)
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os.Exit(1)
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}
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},
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}
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func execute() error {
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// Parse dockerfile and unpack base image to root
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d, err := ioutil.ReadFile(dockerfilePath)
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if err != nil {
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return err
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}
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stages, err := dockerfile.Parse(d)
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if err != nil {
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return err
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}
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// Set the escape token
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if err := dockerfile.SetEscapeToken(d); err != nil {
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return err
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}
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baseImage := stages[0].BaseName
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// Unpack file system to root
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logrus.Infof("Unpacking filesystem of %s...", baseImage)
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if err := util.ExtractFileSystemFromImage(baseImage); err != nil {
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return err
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}
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l := snapshot.NewLayeredMap(util.Hasher())
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snapshotter := snapshot.NewSnapshotter(l, constants.RootDir)
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// Take initial snapshot
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if err := snapshotter.Init(); err != nil {
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return err
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}
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// Initialize source image
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sourceImage, err := image.NewSourceImage(baseImage)
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if err != nil {
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return err
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}
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// Set environment variables within the image
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if err := image.SetEnvVariables(sourceImage); err != nil {
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return err
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}
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imageConfig := sourceImage.Config()
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// Currently only supports single stage builds
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for _, stage := range stages {
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for _, cmd := range stage.Commands {
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dockerCommand, err := commands.GetCommand(cmd)
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if err != nil {
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return err
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}
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if err := dockerCommand.ExecuteCommand(imageConfig); err != nil {
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return err
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}
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// Now, we get the files to snapshot from this command and take the snapshot
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snapshotFiles := dockerCommand.FilesToSnapshot()
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contents, err := snapshotter.TakeSnapshot(snapshotFiles)
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if err != nil {
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return err
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}
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if contents == nil {
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logrus.Info("No files were changed, appending empty layer to config.")
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sourceImage.AppendConfigHistory(constants.Author, true)
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continue
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}
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// Append the layer to the image
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if err := sourceImage.AppendLayer(contents, constants.Author); err != nil {
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return err
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}
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}
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}
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// Push the image
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return image.PushImage(sourceImage, destination)
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}
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