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exporter.go
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exporter.go
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package main
import (
"context"
"fmt"
"os"
"path/filepath"
"strconv"
"time"
"github.com/buildpacks/imgutil"
"github.com/buildpacks/imgutil/layout"
"github.com/buildpacks/imgutil/local"
"github.com/buildpacks/imgutil/remote"
"github.com/docker/docker/client"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
"github.com/buildpacks/lifecycle/auth"
"github.com/buildpacks/lifecycle/buildpack"
"github.com/buildpacks/lifecycle/cache"
"github.com/buildpacks/lifecycle/cmd"
"github.com/buildpacks/lifecycle/cmd/lifecycle/cli"
"github.com/buildpacks/lifecycle/image"
"github.com/buildpacks/lifecycle/layers"
"github.com/buildpacks/lifecycle/phase"
"github.com/buildpacks/lifecycle/platform"
"github.com/buildpacks/lifecycle/platform/files"
"github.com/buildpacks/lifecycle/priv"
)
type exportCmd struct {
*platform.Platform
docker client.CommonAPIClient // construct if necessary before dropping privileges
keychain authn.Keychain // construct if necessary before dropping privileges
persistedData exportData
}
type exportData struct {
analyzedMD files.Analyzed
}
// DefineFlags defines the flags that are considered valid and reads their values (if provided).
func (e *exportCmd) DefineFlags() {
if e.PlatformAPI.AtLeast("0.13") {
cli.FlagInsecureRegistries(&e.InsecureRegistries)
}
if e.PlatformAPI.AtLeast("0.12") {
cli.FlagExtendedDir(&e.ExtendedDir)
cli.FlagLayoutDir(&e.LayoutDir)
cli.FlagRunPath(&e.RunPath)
cli.FlagUseLayout(&e.UseLayout)
}
if e.PlatformAPI.AtLeast("0.11") {
cli.FlagLauncherSBOMDir(&e.LauncherSBOMDir)
}
cli.FlagAnalyzedPath(&e.AnalyzedPath)
cli.FlagAppDir(&e.AppDir)
cli.FlagCacheDir(&e.CacheDir)
cli.FlagCacheImage(&e.CacheImageRef)
cli.FlagGID(&e.GID)
cli.FlagGroupPath(&e.GroupPath)
cli.FlagLaunchCacheDir(&e.LaunchCacheDir)
cli.FlagLauncherPath(&e.LauncherPath)
cli.FlagLayersDir(&e.LayersDir)
cli.FlagLogLevel(&e.LogLevel)
cli.FlagNoColor(&e.NoColor)
cli.FlagParallelExport(&e.ParallelExport)
cli.FlagProcessType(&e.DefaultProcessType)
cli.FlagProjectMetadataPath(&e.ProjectMetadataPath)
cli.FlagReportPath(&e.ReportPath)
cli.FlagRunImage(&e.RunImageRef) // FIXME: this flag isn't valid on Platform 0.7 and later
cli.FlagUID(&e.UID)
cli.FlagUseDaemon(&e.UseDaemon)
// deprecated
cli.DeprecatedFlagRunImage(&e.DeprecatedRunImageRef) // FIXME: this flag isn't valid on Platform 0.7 and later
if e.PlatformAPI.LessThan("0.12") {
cli.FlagStackPath(&e.StackPath)
}
}
// Args validates arguments and flags, and fills in default values.
func (e *exportCmd) Args(nargs int, args []string) error {
if nargs == 0 {
return cmd.FailErrCode(errors.New("at least one image argument is required"), cmd.CodeForInvalidArgs, "parse arguments")
}
e.OutputImageRef = args[0]
e.AdditionalTags = args[1:]
if err := platform.ResolveInputs(platform.Export, e.LifecycleInputs, cmd.DefaultLogger); err != nil {
return cmd.FailErrCode(err, cmd.CodeForInvalidArgs, "resolve inputs")
}
// read analyzed metadata for use in later stages
var err error
e.persistedData.analyzedMD, err = files.Handler.ReadAnalyzed(e.AnalyzedPath, cmd.DefaultLogger)
if err != nil {
return err
}
if e.UseLayout {
if err := platform.GuardExperimental(platform.LayoutFormat, cmd.DefaultLogger); err != nil {
return err
}
}
return nil
}
func (e *exportCmd) Privileges() error {
var err error
e.keychain, err = auth.DefaultKeychain(e.registryImages()...)
if err != nil {
return cmd.FailErr(err, "resolve keychain")
}
if e.UseDaemon {
var err error
e.docker, err = priv.DockerClient()
if err != nil {
return cmd.FailErr(err, "initialize docker client")
}
}
if err = priv.EnsureOwner(e.UID, e.GID, e.CacheDir, e.LaunchCacheDir); err != nil {
return cmd.FailErr(err, "chown volumes")
}
if err = priv.RunAs(e.UID, e.GID); err != nil {
return cmd.FailErr(err, fmt.Sprintf("exec as user %d:%d", e.UID, e.GID))
}
return nil
}
func (e *exportCmd) Exec() error {
group, err := files.Handler.ReadGroup(e.GroupPath)
if err != nil {
return err
}
if err = verifyBuildpackApis(group); err != nil {
return err
}
cacheStore, err := initCache(e.CacheImageRef, e.CacheDir, e.keychain, e.PlatformAPI.LessThan("0.13"))
if err != nil {
return err
}
if e.hasExtendedLayers() && e.PlatformAPI.LessThan("0.13") {
if err := platform.GuardExperimental(platform.FeatureDockerfiles, cmd.DefaultLogger); err != nil {
return err
}
}
return e.export(group, cacheStore, e.persistedData.analyzedMD)
}
func (e *exportCmd) registryImages() []string {
registryImages := e.RegistryImages()
if !e.UseDaemon {
if e.persistedData.analyzedMD.PreviousImageRef() != "" {
registryImages = append(registryImages, e.persistedData.analyzedMD.PreviousImageRef())
}
}
return registryImages
}
func (e *exportCmd) export(group buildpack.Group, cacheStore phase.Cache, analyzedMD files.Analyzed) error {
artifactsDir, err := os.MkdirTemp("", "lifecycle.exporter.layer")
if err != nil {
return cmd.FailErr(err, "create temp directory")
}
defer os.RemoveAll(artifactsDir)
projectMD, err := files.Handler.ReadProjectMetadata(e.ProjectMetadataPath, cmd.DefaultLogger)
if err != nil {
return err
}
g := new(errgroup.Group)
var ctx context.Context
if e.ParallelExport {
g, ctx = errgroup.WithContext(context.Background())
}
exporter := &phase.Exporter{
Buildpacks: group.Group,
LayerFactory: &layers.Factory{
ArtifactsDir: artifactsDir,
UID: e.UID,
GID: e.GID,
Logger: cmd.DefaultLogger,
Ctx: ctx,
},
Logger: cmd.DefaultLogger,
PlatformAPI: e.PlatformAPI,
}
var (
appImage imgutil.Image
runImageID string
)
switch {
case e.UseLayout:
appImage, runImageID, err = e.initLayoutAppImage(analyzedMD)
case e.UseDaemon:
appImage, runImageID, err = e.initDaemonAppImage(analyzedMD)
default:
appImage, runImageID, err = e.initRemoteAppImage(analyzedMD)
}
if err != nil {
return err
}
runImageForExport, err := platform.GetRunImageForExport(e.Inputs())
if err != nil {
return err
}
g.Go(func() error {
report, err := exporter.Export(phase.ExportOptions{
AdditionalNames: e.AdditionalTags,
AppDir: e.AppDir,
DefaultProcessType: e.DefaultProcessType,
ExtendedDir: e.ExtendedDir,
LauncherConfig: launcherConfig(e.LauncherPath, e.LauncherSBOMDir),
LayersDir: e.LayersDir,
OrigMetadata: analyzedMD.LayersMetadata,
Project: projectMD,
RunImageRef: runImageID,
RunImageForExport: runImageForExport,
WorkingImage: appImage,
})
if err != nil {
return cmd.FailErrCode(err, e.CodeFor(platform.ExportError), "export")
}
if err = files.Handler.WriteReport(e.ReportPath, &report); err != nil {
return cmd.FailErrCode(err, e.CodeFor(platform.ExportError), "write export report")
}
return nil
})
if !e.ParallelExport {
if err := g.Wait(); err != nil {
return err
}
}
g.Go(func() error {
if cacheStore != nil {
if cacheErr := exporter.Cache(e.LayersDir, cacheStore); cacheErr != nil {
cmd.DefaultLogger.Warnf("Failed to export cache: %v\n", cacheErr)
}
}
return nil
})
if err = g.Wait(); err != nil {
return err
}
return nil
}
func (e *exportCmd) initDaemonAppImage(analyzedMD files.Analyzed) (imgutil.Image, string, error) {
var opts = []imgutil.ImageOption{
local.FromBaseImage(e.RunImageRef),
}
if e.supportsRunImageExtension() {
extendedConfig, err := e.getExtendedConfig(analyzedMD.RunImage)
if err != nil {
return nil, "", cmd.FailErr(err, "get extended image config")
}
if extendedConfig != nil {
opts = append(opts, local.WithConfig(extendedConfig))
}
}
if e.supportsHistory() {
opts = append(opts, local.WithHistory())
}
if analyzedMD.PreviousImageRef() != "" {
cmd.DefaultLogger.Debugf("Reusing layers from image with id '%s'", analyzedMD.PreviousImageRef())
opts = append(opts, local.WithPreviousImage(analyzedMD.PreviousImageRef()))
}
if !e.customSourceDateEpoch().IsZero() {
opts = append(opts, local.WithCreatedAt(e.customSourceDateEpoch()))
}
var appImage imgutil.Image
appImage, err := local.NewImage(
e.OutputImageRef,
e.docker,
opts...,
)
if err != nil {
return nil, "", cmd.FailErr(err, " image")
}
runImageID, err := appImage.Identifier()
if err != nil {
return nil, "", cmd.FailErr(err, "get run image ID")
}
if e.LaunchCacheDir != "" {
volumeCache, err := cache.NewVolumeCache(e.LaunchCacheDir)
if err != nil {
return nil, "", cmd.FailErr(err, "create launch cache")
}
appImage = cache.NewCachingImage(appImage, volumeCache)
}
return appImage, runImageID.String(), nil
}
func (e *exportCmd) initRemoteAppImage(analyzedMD files.Analyzed) (imgutil.Image, string, error) {
var opts = []imgutil.ImageOption{
remote.FromBaseImage(e.RunImageRef),
}
if e.supportsRunImageExtension() {
extendedConfig, err := e.getExtendedConfig(analyzedMD.RunImage)
if err != nil {
return nil, "", cmd.FailErr(err, "get extended image config")
}
if extendedConfig != nil {
cmd.DefaultLogger.Debugf("Using config from extensions...")
opts = append(opts, remote.WithConfig(extendedConfig))
}
}
if e.supportsHistory() {
opts = append(opts, remote.WithHistory())
}
opts = append(opts, image.GetInsecureOptions(e.InsecureRegistries)...)
if analyzedMD.PreviousImageRef() != "" {
cmd.DefaultLogger.Infof("Reusing layers from image '%s'", analyzedMD.PreviousImageRef())
opts = append(opts, remote.WithPreviousImage(analyzedMD.PreviousImageRef()))
}
if !e.customSourceDateEpoch().IsZero() {
opts = append(opts, remote.WithCreatedAt(e.customSourceDateEpoch()))
}
appImage, err := remote.NewImage(
e.OutputImageRef,
e.keychain,
opts...,
)
if err != nil {
return nil, "", cmd.FailErr(err, "create new app image")
}
runImage, err := remote.NewImage(e.RunImageRef, e.keychain, remote.FromBaseImage(e.RunImageRef))
if err != nil {
return nil, "", cmd.FailErr(err, "access run image")
}
runImageID, err := runImage.Identifier()
if err != nil {
return nil, "", cmd.FailErr(err, "get run image reference")
}
return appImage, runImageID.String(), nil
}
func (e *exportCmd) initLayoutAppImage(analyzedMD files.Analyzed) (imgutil.Image, string, error) {
runImageIdentifier, err := layout.ParseIdentifier(analyzedMD.RunImage.Reference)
if err != nil {
return nil, "", cmd.FailErr(err, "parsing run image reference")
}
var opts = []imgutil.ImageOption{
layout.FromBaseImagePath(runImageIdentifier.Path),
}
if e.supportsHistory() {
opts = append(opts, layout.WithHistory())
}
if analyzedMD.PreviousImageRef() != "" {
previousImageReference, err := layout.ParseIdentifier(analyzedMD.PreviousImageRef())
if err != nil {
return nil, "", cmd.FailErr(err, "parsing previous image reference")
}
cmd.DefaultLogger.Infof("Reusing layers from image '%s'", previousImageReference.Path)
opts = append(opts, layout.WithPreviousImage(previousImageReference.Path))
}
if !e.customSourceDateEpoch().IsZero() {
opts = append(opts, layout.WithCreatedAt(e.customSourceDateEpoch()))
}
outputImageRefPath, err := layout.ParseRefToPath(e.OutputImageRef)
if err != nil {
return nil, "", cmd.FailErr(err, "parsing output image reference")
}
appPath := filepath.Join(e.LayoutDir, outputImageRefPath)
cmd.DefaultLogger.Infof("Using app image: %s\n", appPath)
appImage, err := layout.NewImage(appPath, opts...)
if err != nil {
return nil, "", cmd.FailErr(err, "create new app image")
}
// set org.opencontainers.image.ref.name
reference, err := name.ParseReference(e.OutputImageRef, name.WeakValidation)
if err != nil {
return nil, "", err
}
if err = appImage.AnnotateRefName(reference.Identifier()); err != nil {
return nil, "", err
}
runImage, err := layout.NewImage(runImageIdentifier.Path)
if err != nil {
return nil, "", cmd.FailErr(err, "access run image")
}
runImageID, err := runImage.Identifier()
if err != nil {
return nil, "", cmd.FailErr(err, "get run image reference")
}
return appImage, runImageID.String(), nil
}
func launcherConfig(launcherPath, launcherSBOMDir string) phase.LauncherConfig {
return phase.LauncherConfig{
Path: launcherPath,
SBOMDir: launcherSBOMDir,
Metadata: files.LauncherMetadata{
Version: cmd.Version,
Source: files.SourceMetadata{
Git: files.GitMetadata{
Repository: cmd.SCMRepository,
Commit: cmd.SCMCommit,
},
},
},
}
}
func (e *exportCmd) customSourceDateEpoch() time.Time {
if e.PlatformAPI.LessThan("0.9") {
return time.Time{}
}
if epoch := os.Getenv("SOURCE_DATE_EPOCH"); epoch != "" {
seconds, err := strconv.ParseInt(epoch, 10, 64)
if err != nil {
cmd.DefaultLogger.Warn("Ignoring invalid SOURCE_DATE_EPOCH")
return time.Time{}
}
return time.Unix(seconds, 0)
}
return time.Time{}
}
func (e *exportCmd) supportsRunImageExtension() bool {
return e.PlatformAPI.AtLeast("0.12") && !e.UseLayout // FIXME: add layout support as part of https://github.com/buildpacks/lifecycle/issues/1102
}
func (e *exportCmd) supportsHistory() bool {
return e.PlatformAPI.AtLeast("0.12")
}
func (e *exportCmd) getExtendedConfig(runImage *files.RunImage) (*v1.Config, error) {
if runImage == nil {
return nil, errors.New("missing analyzed run image")
}
if !runImage.Extend {
return nil, nil
}
extendedImage, _, err := image.FromLayoutPath(filepath.Join(e.ExtendedDir, "run"))
if err != nil {
return nil, err
}
if extendedImage == nil {
return nil, errors.New("missing extended run image")
}
extendedConfig, err := extendedImage.ConfigFile()
if err != nil {
return nil, err
}
if extendedConfig == nil {
return nil, errors.New("missing extended run image config")
}
return &extendedConfig.Config, nil
}
func (e *exportCmd) hasExtendedLayers() bool {
if e.ExtendedDir == "" {
return false
}
fis, err := os.ReadDir(filepath.Join(e.ExtendedDir, "run"))
if err != nil {
return false
}
if len(fis) == 0 {
return false
}
return true
}