Fix GetProjectRoot in GO (#16520)

### Summary

Fix GetProjectRoot in GO

internal/engine/infinity/sql.go

@@ -31,6 +31,7 @@ import (
 	"time"
 
 	"ragflow/internal/common"
+	"ragflow/internal/utility"
 
 	"go.uber.org/zap"
 )
@@ -58,7 +59,7 @@ func loadFieldMapping(mappingFileName string) (aliasToActual map[string]string,
 	if mappingFileName == "" {
 		mappingFileName = "infinity_mapping.json"
 	}
-	confPath := filepath.Join(projectBaseDir(), "conf", mappingFileName)
+	confPath := filepath.Join(utility.GetProjectRoot(), "conf", mappingFileName)
 	data, err := os.ReadFile(confPath)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
@@ -96,24 +97,6 @@ func loadFieldMapping(mappingFileName string) (aliasToActual map[string]string,
 	return aliasToActual, actualToFirstAlias, nil
 }
 
-// projectBaseDir returns the project root. Honors RAG_PROJECT_BASE and
-// RAG_DEPLOY_BASE env vars; falls back to working directory.
-func projectBaseDir() string {
-	if v := os.Getenv("RAG_PROJECT_BASE"); v != "" {
-		return v
-	}
-	if v := os.Getenv("RAG_DEPLOY_BASE"); v != "" {
-		return v
-	}
-	// Fall back to the repository root. The Go engine package lives at
-	// internal/engine/infinity/; the repo root is three levels up.
-	wd, err := os.Getwd()
-	if err != nil {
-		return "."
-	}
-	return wd
-}
-
 // preprocessSQL collapses spaces/backticks and strips '%'.
 func preprocessSQL(sql string) string {
 	sql = whitespaceRe.ReplaceAllString(sql, " ")

internal/utility/path.go

@@ -19,28 +19,23 @@ package utility
 import (
 	"os"
 	"path/filepath"
-	"runtime"
 )
 
-// GetProjectRoot returns the project root directory by finding go.mod marker
+// GetProjectRoot returns the project root directory
 func GetProjectRoot() string {
 	// Try environment variable first
-	if confDir := os.Getenv("RAGFLOW_CONF_DIR"); confDir != "" {
-		return confDir
+	if d := os.Getenv("RAG_PROJECT_BASE"); d != "" {
+		return d
+	}
+	if d := os.Getenv("RAG_DEPLOY_BASE"); d != "" {
+		return d
 	}
 
-	// Find project root by looking for go.mod
-	_, curFile, _, _ := runtime.Caller(0)
-	dir := filepath.Dir(curFile)
-	for {
-		if _, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil {
-			return dir
-		}
-		parent := filepath.Dir(dir)
-		if parent == dir {
-			// Reached filesystem root, fallback to hardcoded path
-			return filepath.Dir(filepath.Dir(filepath.Dir(filepath.Dir(curFile))))
-		}
-		dir = parent
+	// The binary is always at <project_root>/bin/, so going up 2 levels from
+	// the executable path gives the project root.
+	exe, err := os.Executable()
+	if err != nil {
+		return "."
 	}
+	return filepath.Dir(filepath.Dir(exe))
 }