| package opts // import "github.com/docker/docker/opts" |
| |
| import ( |
| "os" |
| "strings" |
| |
| "github.com/pkg/errors" |
| ) |
| |
| // ValidateEnv validates an environment variable and returns it. |
| // If no value is specified, it obtains its value from the current environment |
| // |
| // As on ParseEnvFile and related to #16585, environment variable names |
| // are not validate whatsoever, it's up to application inside docker |
| // to validate them or not. |
| // |
| // The only validation here is to check if name is empty, per #25099 |
| func ValidateEnv(val string) (string, error) { |
| arr := strings.SplitN(val, "=", 2) |
| if arr[0] == "" { |
| return "", errors.New("invalid environment variable: " + val) |
| } |
| if len(arr) > 1 { |
| return val, nil |
| } |
| if envVal, ok := os.LookupEnv(arr[0]); ok { |
| return arr[0] + "=" + envVal, nil |
| } |
| return val, nil |
| } |