SDP-1934 Add configurable environment file loading to support multiple deployment contexts

Author: marwen-abid

cmd/root.go

@@ -66,6 +66,14 @@ func rootCmd() *cobra.Command {
 			FlagDefault: "http://localhost:3000",
 			Required:    true,
 		},
+		// env-file flag is already handled in main.go, but it needs to be also defined here because Cobra doesn't allow unknown flags.
+		{
+			Name:      "env-file",
+			Usage:     "Path to environment file to load (e.g., \"dev/.env.https-testnet\"). Supports absolute and relative paths. Defaults to \".env\" if not specified.",
+			OptType:   types.String,
+			ConfigKey: &globalOptions.EnvFile,
+			Required:  false,
+		},
 		cmdUtils.NetworkPassphrase(&globalOptions.NetworkPassphrase),
 	}
 

cmd/utils/env_loader.go

@@ -0,0 +1,89 @@
+package utils
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/joho/godotenv"
+)
+
+const (
+	envFileFlag   = "--env-file"
+	envFileEnvVar = "ENV_FILE"
+)
+
+// LoadEnvFile loads environment variables from a file.
+// Priority: --env-file flag > ENV_FILE environment variable > .env in working directory
+func LoadEnvFile() error {
+	envFilePath := determineEnvFilePath()
+
+	if envFilePath != "" {
+		return loadExplicitEnvFile(envFilePath)
+	}
+
+	return loadDefaultEnvFile()
+}
+
+// determineEnvFilePath determines the path to the env file based on priority.
+func determineEnvFilePath() string {
+	if path := parseEnvFileFlag(); path != "" {
+		return toAbsolutePath(path)
+	}
+
+	if path := os.Getenv(envFileEnvVar); path != "" {
+		return toAbsolutePath(path)
+	}
+
+	return ""
+}
+
+// parseEnvFileFlag checks command-line arguments for the --env-file flag.
+func parseEnvFileFlag() string {
+	for i, arg := range os.Args {
+		if arg == envFileFlag && i+1 < len(os.Args) {
+			return os.Args[i+1]
+		}
+		if strings.HasPrefix(arg, envFileFlag+"=") {
+			return strings.TrimPrefix(arg, envFileFlag+"=")
+		}
+	}
+	return ""
+}
+
+// toAbsolutePath converts a relative path to an absolute path.
+func toAbsolutePath(path string) string {
+	if path == "" || filepath.IsAbs(path) {
+		return path
+	}
+
+	absPath, err := filepath.Abs(path)
+	if err != nil {
+		return path
+	}
+	return absPath
+}
+
+// loadExplicitEnvFile loads environment variables from the specified file.
+func loadExplicitEnvFile(path string) error {
+	if err := godotenv.Load(path); err != nil {
+		return fmt.Errorf("loading env file %s: %w", path, err)
+	}
+	return nil
+}
+
+// loadDefaultEnvFile loads environment variables from the default .env file.
+func loadDefaultEnvFile() error {
+	err := godotenv.Load()
+	if err == nil {
+		return nil
+	}
+
+	if errors.Is(err, os.ErrNotExist) {
+		return nil
+	}
+
+	return fmt.Errorf("loading .env file: %w", err)
+}