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Copy pathrebase.go
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111 lines (93 loc) · 2.69 KB
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package pack
import (
"context"
"encoding/json"
"github.com/buildpack/imgutil"
"github.com/buildpack/lifecycle/metadata"
"github.com/pkg/errors"
"github.com/buildpack/pack/config"
"github.com/buildpack/pack/style"
)
type RebaseOptions struct {
RepoName string
Publish bool
SkipPull bool
RunImage string
}
func (c *Client) Rebase(ctx context.Context, opts RebaseOptions) error {
appImage, err := c.imageFetcher.Fetch(ctx, opts.RepoName, !opts.Publish, !opts.SkipPull)
if err != nil {
return err
}
runImageName, err := c.getRunImageName(ctx, opts, appImage)
if err != nil {
return err
}
baseImage, err := c.imageFetcher.Fetch(ctx, runImageName, !opts.Publish, !opts.SkipPull)
if err != nil {
return err
}
label, err := appImage.Label(metadata.AppMetadataLabel)
if err != nil {
return err
}
var md metadata.AppImageMetadata
if err := json.Unmarshal([]byte(label), &md); err != nil {
return err
}
c.logger.Infof("Rebasing %s on run image %s", style.Symbol(appImage.Name()), style.Symbol(baseImage.Name()))
if err := appImage.Rebase(md.RunImage.TopLayer, baseImage); err != nil {
return err
}
md.RunImage.SHA, err = baseImage.Digest()
if err != nil {
return err
}
md.RunImage.TopLayer, err = baseImage.TopLayer()
if err != nil {
return err
}
newLabel, err := json.Marshal(md)
if err := appImage.SetLabel(metadata.AppMetadataLabel, string(newLabel)); err != nil {
return err
}
sha, err := appImage.Save()
if err != nil {
return err
}
c.logger.Infof("New sha: %s", style.Symbol(sha))
return nil
}
func (c *Client) getRunImageName(ctx context.Context, opts RebaseOptions, appImage imgutil.Image) (string, error) {
var runImageName string
if opts.RunImage != "" {
runImageName = opts.RunImage
} else {
contents, err := appImage.Label(metadata.AppMetadataLabel)
if err != nil {
return "", err
}
var appImageMetadata metadata.AppImageMetadata
if err := json.Unmarshal([]byte(contents), &appImageMetadata); err != nil {
return "", err
}
registry, err := config.Registry(opts.RepoName)
if err != nil {
return "", errors.Wrapf(err, "parsing registry from reference '%s'", opts.RepoName)
}
var mirrors []string
if localRunImage := c.config.GetRunImage(appImageMetadata.Stack.RunImage.Image); localRunImage != nil {
mirrors = localRunImage.Mirrors
}
mirrors = append(mirrors, appImageMetadata.Stack.RunImage.Image)
mirrors = append(mirrors, appImageMetadata.Stack.RunImage.Mirrors...)
runImageName, err = config.ImageByRegistry(registry, mirrors)
if err != nil {
return "", errors.Wrapf(err, "find image by registry")
}
}
if runImageName == "" {
return "", errors.New("run image must be specified")
}
return runImageName, nil
}