Function GetEnvFromFile

dotenv/env.go:26–73

(currentEnv map[string]string, filenames []string)

)

func GetEnvFromFile(currentEnv map[string]string, filenames []string) (map[string]string, error) {
	envMap := make(map[string]string)

	for _, dotEnvFile := range filenames {
		abs, err := filepath.Abs(dotEnvFile)
		if err != nil {
			return envMap, err
		}
		dotEnvFile = abs

		s, err := os.Stat(dotEnvFile)
		if os.IsNotExist(err) {
			return envMap, fmt.Errorf("couldn't find env file: %s", dotEnvFile)
		}
		if err != nil {
			return envMap, err
		}

		if s.IsDir() {
			if len(filenames) == 0 {
				return envMap, nil
			}
			return envMap, fmt.Errorf("%s is a directory", dotEnvFile)
		}

		b, err := os.ReadFile(dotEnvFile)
		if os.IsNotExist(err) {
			return nil, fmt.Errorf("couldn't read env file: %s", dotEnvFile)
		}
		if err != nil {
			return envMap, err
		}

		err = parseWithLookup(bytes.NewReader(b), envMap, func(k string) (string, bool) {
			v, ok := currentEnv[k]
			if ok {
				return v, true
			}
			v, ok = envMap[k]
			return v, ok
		})
		if err != nil {
			return envMap, fmt.Errorf("failed to read %s: %w", dotEnvFile, err)
		}
	}

	return envMap, nil
}