add '--config' option to specify the path to configuration file

cmd/iceberg/main.go

@@ -59,7 +59,8 @@ Options:
   --uri TEXT         specify the catalog URI
   --output TYPE      output type (json/text) [default: text]
   --credential TEXT  specify credentials for the catalog
-  --warehouse TEXT   specify the warehouse to use`
+  --warehouse TEXT   specify the warehouse to use
+  --config TEXT      specify the path to the configuration file`
 
 type Config struct {
 	List     bool `docopt:"list"`
@@ -95,6 +96,7 @@ type Config struct {
 	History   bool   `docopt:"--history"`
 	Cred      string `docopt:"--credential"`
 	Warehouse string `docopt:"--warehouse"`
+	Config    string `docopt:"--config"`
 }
 
 func main() {
@@ -109,7 +111,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	fileCfg := config.ParseConfig(config.LoadConfig(), "default")
+	fileCfg := config.ParseConfig(config.LoadConfig(cfg.Config), "default")
 	if fileCfg != nil {
 		mergeConf(fileCfg, &cfg)
 	}

config/config.go

@@ -38,13 +38,19 @@ type CatalogConfig struct {
 	Warehouse  string `yaml:"warehouse"`
 }
 
-func LoadConfig() []byte {
-	homeDir, err := os.UserHomeDir()
-	if err != nil {
-		return nil
+func LoadConfig(configPath string) []byte {
+	var path string
+	if len(configPath) > 0 {
+		path = configPath
+	} else {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			return nil
+
+		}
+		path = filepath.Join(homeDir, cfgFile)
 	}
-	filePath := filepath.Join(homeDir, cfgFile)
-	file, err := os.ReadFile(filePath)
+	file, err := os.ReadFile(path)
 	if err != nil {
 		return nil
 	}