func (s Fetcher) GetStemcell(deploymentManifest bideplmanifest.Manifest, stage biui.Stage) (ExtractedStemcell, error) { stemcell, err := deploymentManifest.Stemcell(deploymentManifest.JobName()) if err != nil { return nil, err } stemcellTarballPath, err := s.TarballProvider.Get(stemcell, stage) if err != nil { return nil, err } var extractedStemcell ExtractedStemcell err = stage.Perform("Validating stemcell", func() error { extractedStemcell, err = s.StemcellExtractor.Extract(stemcellTarballPath) if err != nil { return bosherr.WrapErrorf(err, "Extracting stemcell from '%s'", stemcellTarballPath) } return nil }) if err != nil { return nil, err } return extractedStemcell, nil }