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package 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 validated, and it's up to the application inside the container
// 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
}
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