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create_builder.go
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/
create_builder.go
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package pack
import (
"context"
"fmt"
"github.com/buildpacks/pack/config"
"github.com/Masterminds/semver"
"github.com/buildpacks/imgutil"
"github.com/pkg/errors"
pubbldr "github.com/buildpacks/pack/builder"
"github.com/buildpacks/pack/internal/builder"
"github.com/buildpacks/pack/internal/dist"
"github.com/buildpacks/pack/internal/image"
"github.com/buildpacks/pack/internal/paths"
"github.com/buildpacks/pack/internal/style"
)
// CreateBuilderOptions is a configuration object used to change the behavior of
// CreateBuilder.
type CreateBuilderOptions struct {
// The base directory to use to resolve relative assets
RelativeBaseDir string
// Name of the builder.
BuilderName string
// Configuration that defines the functionality a builder provides.
Config pubbldr.Config
// Skip building image locally, directly publish to a registry.
// Requires BuilderName to be a valid registry location.
Publish bool
// Buildpack registry name. Defines where all registry buildpacks will be pulled from.
Registry string
// Strategy for updating images before a build.
PullPolicy config.PullPolicy
}
// CreateBuilder creates and saves a builder image to a registry with the provided options.
// If any configuration is invalid, it will error and exit without creating any images.
func (c *Client) CreateBuilder(ctx context.Context, opts CreateBuilderOptions) error {
if err := c.validateConfig(ctx, opts); err != nil {
return err
}
bldr, err := c.createBaseBuilder(ctx, opts)
if err != nil {
return errors.Wrap(err, "failed to create builder")
}
if err := c.addBuildpacksToBuilder(ctx, opts, bldr); err != nil {
return errors.Wrap(err, "failed to add buildpacks to builder")
}
bldr.SetOrder(opts.Config.Order)
bldr.SetStack(opts.Config.Stack)
return bldr.Save(c.logger, builder.CreatorMetadata{Version: Version})
}
func (c *Client) validateConfig(ctx context.Context, opts CreateBuilderOptions) error {
if err := pubbldr.ValidateConfig(opts.Config); err != nil {
return errors.Wrap(err, "invalid builder config")
}
if err := c.validateRunImageConfig(ctx, opts); err != nil {
return errors.Wrap(err, "invalid run image config")
}
return nil
}
func (c *Client) validateRunImageConfig(ctx context.Context, opts CreateBuilderOptions) error {
var runImages []imgutil.Image
for _, i := range append([]string{opts.Config.Stack.RunImage}, opts.Config.Stack.RunImageMirrors...) {
if !opts.Publish {
img, err := c.imageFetcher.Fetch(ctx, i, image.FetchOptions{Daemon: true, PullPolicy: opts.PullPolicy})
if err != nil {
if errors.Cause(err) != image.ErrNotFound {
return errors.Wrap(err, "failed to fetch image")
}
} else {
runImages = append(runImages, img)
continue
}
}
img, err := c.imageFetcher.Fetch(ctx, i, image.FetchOptions{Daemon: false, PullPolicy: opts.PullPolicy})
if err != nil {
if errors.Cause(err) != image.ErrNotFound {
return errors.Wrap(err, "failed to fetch image")
}
c.logger.Warnf("run image %s is not accessible", style.Symbol(i))
} else {
runImages = append(runImages, img)
}
}
for _, img := range runImages {
stackID, err := img.Label("io.buildpacks.stack.id")
if err != nil {
return errors.Wrap(err, "failed to label image")
}
if stackID != opts.Config.Stack.ID {
return fmt.Errorf(
"stack %s from builder config is incompatible with stack %s from run image %s",
style.Symbol(opts.Config.Stack.ID),
style.Symbol(stackID),
style.Symbol(img.Name()),
)
}
}
return nil
}
func (c *Client) createBaseBuilder(ctx context.Context, opts CreateBuilderOptions) (*builder.Builder, error) {
baseImage, err := c.imageFetcher.Fetch(ctx, opts.Config.Stack.BuildImage, image.FetchOptions{Daemon: !opts.Publish, PullPolicy: opts.PullPolicy})
if err != nil {
return nil, errors.Wrap(err, "fetch build image")
}
c.logger.Debugf("Creating builder %s from build-image %s", style.Symbol(opts.BuilderName), style.Symbol(baseImage.Name()))
bldr, err := builder.New(baseImage, opts.BuilderName)
if err != nil {
return nil, errors.Wrap(err, "invalid build-image")
}
os, err := baseImage.OS()
if err != nil {
return nil, errors.Wrap(err, "lookup image OS")
}
if os == "windows" && !c.experimental {
return nil, NewExperimentError("Windows containers support is currently experimental.")
}
bldr.SetDescription(opts.Config.Description)
if bldr.StackID != opts.Config.Stack.ID {
return nil, fmt.Errorf(
"stack %s from builder config is incompatible with stack %s from build image",
style.Symbol(opts.Config.Stack.ID),
style.Symbol(bldr.StackID),
)
}
lifecycle, err := c.fetchLifecycle(ctx, opts.Config.Lifecycle, opts.RelativeBaseDir, os)
if err != nil {
return nil, errors.Wrap(err, "fetch lifecycle")
}
bldr.SetLifecycle(lifecycle)
return bldr, nil
}
func (c *Client) fetchLifecycle(ctx context.Context, config pubbldr.LifecycleConfig, relativeBaseDir, os string) (builder.Lifecycle, error) {
if config.Version != "" && config.URI != "" {
return nil, errors.Errorf(
"%s can only declare %s or %s, not both",
style.Symbol("lifecycle"), style.Symbol("version"), style.Symbol("uri"),
)
}
var uri string
var err error
switch {
case config.Version != "":
v, err := semver.NewVersion(config.Version)
if err != nil {
return nil, errors.Wrapf(err, "%s must be a valid semver", style.Symbol("lifecycle.version"))
}
uri = uriFromLifecycleVersion(*v, os)
case config.URI != "":
uri, err = paths.FilePathToURI(config.URI, relativeBaseDir)
if err != nil {
return nil, err
}
default:
uri = uriFromLifecycleVersion(*semver.MustParse(builder.DefaultLifecycleVersion), os)
}
blob, err := c.downloader.Download(ctx, uri)
if err != nil {
return nil, errors.Wrap(err, "downloading lifecycle")
}
lifecycle, err := builder.NewLifecycle(blob)
if err != nil {
return nil, errors.Wrap(err, "invalid lifecycle")
}
return lifecycle, nil
}
func (c *Client) addBuildpacksToBuilder(ctx context.Context, opts CreateBuilderOptions, bldr *builder.Builder) error {
for _, b := range opts.Config.Buildpacks {
c.logger.Debugf("Looking up buildpack %s", style.Symbol(b.DisplayString()))
imageOS, err := bldr.Image().OS()
if err != nil {
return errors.Wrapf(err, "getting OS from %s", style.Symbol(bldr.Image().Name()))
}
mainBP, depBPs, err := c.BuildpackDownloader.Download(ctx, b.URI, BuildpackDownloadOptions{
RegistryName: opts.Registry,
ImageOS: imageOS,
RelativeBaseDir: opts.RelativeBaseDir,
Daemon: !opts.Publish,
PullPolicy: opts.PullPolicy,
ImageName: b.ImageName,
})
if err != nil {
return errors.Wrap(err, "downloading buildpack")
}
err = validateBuildpack(mainBP, b.URI, b.ID, b.Version)
if err != nil {
return errors.Wrap(err, "invalid buildpack")
}
bpDesc := mainBP.Descriptor()
for _, deprecatedAPI := range bldr.LifecycleDescriptor().APIs.Buildpack.Deprecated {
if deprecatedAPI.Equal(bpDesc.API) {
c.logger.Warnf("Buildpack %s is using deprecated Buildpacks API version %s", style.Symbol(bpDesc.Info.FullName()), style.Symbol(bpDesc.API.String()))
break
}
}
for _, bp := range append([]dist.Buildpack{mainBP}, depBPs...) {
bldr.AddBuildpack(bp)
}
}
return nil
}
func validateBuildpack(bp dist.Buildpack, source, expectedID, expectedBPVersion string) error {
if expectedID != "" && bp.Descriptor().Info.ID != expectedID {
return fmt.Errorf(
"buildpack from URI %s has ID %s which does not match ID %s from builder config",
style.Symbol(source),
style.Symbol(bp.Descriptor().Info.ID),
style.Symbol(expectedID),
)
}
if expectedBPVersion != "" && bp.Descriptor().Info.Version != expectedBPVersion {
return fmt.Errorf(
"buildpack from URI %s has version %s which does not match version %s from builder config",
style.Symbol(source),
style.Symbol(bp.Descriptor().Info.Version),
style.Symbol(expectedBPVersion),
)
}
return nil
}
func uriFromLifecycleVersion(version semver.Version, os string) string {
if os == "windows" {
return fmt.Sprintf("https://github.com/buildpacks/lifecycle/releases/download/v%s/lifecycle-v%s+windows.x86-64.tgz", version.String(), version.String())
}
return fmt.Sprintf("https://github.com/buildpacks/lifecycle/releases/download/v%s/lifecycle-v%s+linux.x86-64.tgz", version.String(), version.String())
}