func unpackGzip()

in commands/util.go [663:736]
62 lines of code
9 McCabe index (conditional complexity)

func unpackGzip(inpath string, outpath string) error {
	var exists bool
	var err error

	exists, err = FileExists(outpath)

	if err != nil {
		return err
	}

	if exists {
		errStr := wski18n.T("The file '{{.name}}' already exists.  Delete it and retry.",
			map[string]interface{}{"name": outpath})
		werr := whisk.MakeWskError(errors.New(errStr), whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
		return werr
	}

	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
	}

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

	gzFile, err := os.Open(inpath)
	if err != nil {
		whisk.Debug(whisk.DbgError, "os.Open(%s) failed: %s\n", inpath, err)
		errStr := wski18n.T("Error opening Gzip 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 gzFile.Close()

	gzReader, err := gzip.NewReader(gzFile)
	if err != nil {
		whisk.Debug(whisk.DbgError, "gzip.NewReader() failed: %s\n", err)
		errStr := wski18n.T("Unable to unzip 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
	}

	_, err = io.Copy(unGzFile, gzReader)
	if err != nil {
		whisk.Debug(whisk.DbgError, "io.Copy() failed: %s\n", err)
		errStr := wski18n.T("Unable to unzip 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
	}

	return nil
}