/
buildpack.go
140 lines (116 loc) · 3.87 KB
/
buildpack.go
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// Package cnbutils provides utility functions to interact with Buildpacks
package cnbutils
import (
"encoding/json"
"os"
"path/filepath"
"github.com/SAP/jenkins-library/pkg/log"
"github.com/pkg/errors"
)
const bpCacheDir = "/tmp/buildpacks_cache"
type BuildPackMetadata struct {
ID string `toml:"id,omitempty" json:"id,omitempty" yaml:"id,omitempty"`
Name string `toml:"name,omitempty" json:"name,omitempty" yaml:"name,omitempty"`
Version string `toml:"version,omitempty" json:"version,omitempty" yaml:"version,omitempty"`
Description string `toml:"description,omitempty" json:"description,omitempty" yaml:"description,omitempty"`
Homepage string `toml:"homepage,omitempty" json:"homepage,omitempty" yaml:"homepage,omitempty"`
Keywords []string `toml:"keywords,omitempty" json:"keywords,omitempty" yaml:"keywords,omitempty"`
Licenses []License `toml:"licenses,omitempty" json:"licenses,omitempty" yaml:"licenses,omitempty"`
}
type License struct {
Type string `toml:"type" json:"type"`
URI string `toml:"uri" json:"uri"`
}
func DownloadBuildpacks(path string, bpacks []string, dockerCreds string, utils BuildUtils) error {
if dockerCreds != "" {
os.Setenv("DOCKER_CONFIG", filepath.Dir(dockerCreds))
}
err := utils.MkdirAll(bpCacheDir, os.ModePerm)
if err != nil {
return errors.Wrap(err, "failed to create temp directory for buildpack cache")
}
for _, bpack := range bpacks {
imageInfo, err := utils.GetRemoteImageInfo(bpack)
if err != nil {
return errors.Wrap(err, "failed to get remote image info of buildpack")
}
hash, err := imageInfo.Digest()
if err != nil {
return errors.Wrap(err, "failed to get image digest")
}
cacheDir := filepath.Join(bpCacheDir, hash.String())
cacheExists, err := utils.DirExists(cacheDir)
if err != nil {
return errors.Wrapf(err, "failed to check if cache dir '%s' exists", cacheDir)
}
if cacheExists {
log.Entry().Infof("Using cached buildpack '%s'", bpack)
} else {
err := utils.MkdirAll(cacheDir, os.ModePerm)
if err != nil {
return errors.Wrap(err, "failed to create temp directory for buildpack cache")
}
log.Entry().Infof("Downloading buildpack '%s' to %s", bpack, cacheDir)
_, err = utils.DownloadImageContent(bpack, cacheDir)
if err != nil {
return errors.Wrapf(err, "failed download buildpack image '%s'", bpack)
}
}
matches, err := utils.Glob(filepath.Join(cacheDir, "cnb/buildpacks/*"))
if err != nil {
return err
}
for _, match := range matches {
err = CreateVersionSymlinks(path, match, utils)
if err != nil {
return err
}
}
}
return nil
}
func GetMetadata(bpacks []string, utils BuildUtils) ([]BuildPackMetadata, error) {
var metadata []BuildPackMetadata
for _, bpack := range bpacks {
var bpackMeta BuildPackMetadata
imageInfo, err := utils.GetRemoteImageInfo(bpack)
if err != nil {
return nil, err
}
imgConf, err := imageInfo.ConfigFile()
if err != nil {
return nil, errors.Wrapf(err, "failed to read '%s' image config", bpack)
}
err = json.Unmarshal([]byte(imgConf.Config.Labels["io.buildpacks.buildpackage.metadata"]), &bpackMeta)
if err != nil {
return nil, err
}
metadata = append(metadata, bpackMeta)
}
return metadata, nil
}
func CreateVersionSymlinks(basePath, buildpackDir string, utils BuildUtils) error {
newBuildpackPath := filepath.Join(basePath, filepath.Base(buildpackDir))
err := utils.MkdirAll(newBuildpackPath, os.ModePerm)
if err != nil {
return err
}
versions, err := utils.Glob(filepath.Join(buildpackDir, "*"))
if err != nil {
return err
}
for _, version := range versions {
newVersionPath := filepath.Join(newBuildpackPath, filepath.Base(version))
exists, err := utils.DirExists(newVersionPath)
if err != nil {
return err
}
if !exists {
err = utils.Symlink(version, newVersionPath)
if err != nil {
return err
}
}
}
return nil
}