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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package externalbuilder
import (
"archive/tar"
"bytes"
"io"
"os"
"path/filepath"
"github.com/pkg/errors"
)
type MetadataProvider struct {
DurablePath string
}
// PackageMetadata returns a set of bytes encoded as a tar file, containing
// the release metadata as provided by the external builder. If no directory
// with build output from the external builder is found, the tar bytes will
// be nil. If the build output is found, but there is no metadata, the bytes
// will be an empty tar. An error is returned only if the build output is
// found but some other error occurs.
func (mp *MetadataProvider) PackageMetadata(ccid string) ([]byte, error) {
releasePath := filepath.Join(mp.DurablePath, SanitizeCCIDPath(ccid), "release")
_, err := os.Stat(releasePath)
if os.IsNotExist(err) {
return nil, nil
}
if err != nil {
return nil, errors.WithMessage(err, "could not stat path")
}
buffer := bytes.NewBuffer(nil)
tw := tar.NewWriter(buffer)
logger.Debugf("Walking package release dir '%s'", releasePath)
err = filepath.Walk(releasePath, func(file string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
header, err := tar.FileInfoHeader(fi, file)
if err != nil {
return err
}
name, err := filepath.Rel(releasePath, file)
if err != nil {
return err
}
header.Name = filepath.Join("META-INF", name)
if fi.IsDir() {
header.Name += "/"
}
logger.Debugf("Adding file '%s' to tar with header name '%s'", file, header.Name)
if err := tw.WriteHeader(header); err != nil {
return err
}
if fi.IsDir() {
return nil
}
data, err := os.Open(file)
if err != nil {
return errors.WithMessage(err, "could not open file")
}
if _, err := io.Copy(tw, data); err != nil {
return errors.WithMessage(err, "could not copy file into tar")
}
return nil
})
if err != nil {
return nil, errors.WithMessage(err, "could not walk filepath")
}
if err := tw.Close(); err != nil {
return nil, errors.WithMessage(err, "could not write tar")
}
return buffer.Bytes(), err
}
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