func unpackTar()

in commands/util.go [813:893]
75 lines of code
12 McCabe index (conditional complexity)

func unpackTar(inpath string) error {
	exists, err := FileExists(inpath)

	if err != nil {
		return err
	}

	if !exists {
		errMsg := wski18n.T("File '{{.name}}' is not a valid file or it does not exist",
			map[string]interface{}{
				"name": inpath,
			})
		whiskErr := whisk.MakeWskErrorFromWskError(errors.New(errMsg), err, whisk.EXIT_CODE_ERR_USAGE,
			whisk.DISPLAY_MSG, whisk.DISPLAY_USAGE)

		return whiskErr
	}

	tarFileReader, err := os.Open(inpath)
	if err != nil {
		whisk.Debug(whisk.DbgError, "os.Open(%s) failed: %s\n", inpath, err)
		errStr := wski18n.T("Error opening tar file '{{.name}}': {{.err}}",
			map[string]interface{}{"name": inpath, "err": err})
		werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
		return werr
	}
	defer tarFileReader.Close()

	// Loop through the files in the tarfile
	tReader := tar.NewReader(tarFileReader)
	for {
		item, err := tReader.Next()
		if err == io.EOF {
			whisk.Debug(whisk.DbgError, "EOF reach during untar\n")
			break // end of tar
		}
		if err != nil {
			whisk.Debug(whisk.DbgError, "tReader.Next() failed: %s\n", err)
			errStr := wski18n.T("Error reading tar file '{{.name}}': {{.err}}",
				map[string]interface{}{"name": inpath, "err": err})
			werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}

		whisk.Debug(whisk.DbgInfo, "tar file item - %#v\n", item)
		switch item.Typeflag {
		case tar.TypeDir:
			if err := os.MkdirAll(item.Name, os.FileMode(item.Mode)); err != nil {
				whisk.Debug(whisk.DbgError, "os.MkdirAll(%s, %d) failed: %s\n", item.Name, item.Mode, err)
				errStr := wski18n.T("Unable to create directory '{{.dir}}' while untarring '{{.name}}': {{.err}}",
					map[string]interface{}{"dir": item.Name, "name": inpath, "err": err})
				werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
				return werr
			}
		case tar.TypeReg:
			untarFile, err := os.OpenFile(item.Name, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, os.FileMode(item.Mode))
			defer untarFile.Close()
			if err != nil {
				whisk.Debug(whisk.DbgError, "os.Create(%s) failed: %s\n", item.Name, err)
				errStr := wski18n.T("Unable to create file '{{.file}}' while untarring '{{.name}}': {{.err}}",
					map[string]interface{}{"file": item.Name, "name": inpath, "err": err})
				werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
				return werr
			}
			if _, err := io.Copy(untarFile, tReader); err != nil {
				whisk.Debug(whisk.DbgError, "io.Copy() of '%s' failed: %s\n", item.Name, err)
				errStr := wski18n.T("Unable to untar file '{{.name}}': {{.err}}",
					map[string]interface{}{"name": item.Name, "err": err})
				werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
				return werr
			}
		default:
			whisk.Debug(whisk.DbgError, "Unexpected tar file type of %q\n", item.Typeflag)
			errStr := wski18n.T("Unable to untar '{{.name}}' due to unexpected tar file type\n",
				map[string]interface{}{"name": item.Name})
			werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}
	}
	return nil
}