fix ProjectRoot injection, panic if injection failed

.github/workflows/go.yml

@@ -95,13 +95,15 @@ jobs:
         run: go install -v ./...
 
       - name: Test with coverage
-        run: go test -v -coverprofile=coverage.txt -covermode=atomic ./...
+        run: go test -coverprofile=coverage.txt -covermode=atomic ./...
 
       - name: Test gopy
         run: |
+          set -x
           gopy init $HOME/foo
           cd $HOME/foo
           gopy build -v .
+          export GP_INJECT_DEBUG=1
           gopy run -v .
           gopy install -v .
 

cmd/internal/rungo/run.go

@@ -139,36 +139,23 @@
 	result := make([]string, 0, len(args))
 
 	// Prepare the -X flags we want to add
-	var xFlags []string
-	if pythonHome != "" {
-		xFlags = append(xFlags, fmt.Sprintf("-X 'github.com/cpunion/go-python.ProjectRoot=%s'", projectRoot))
-	}
+	ldflags := fmt.Sprintf("-X 'github.com/cpunion/go-python.ProjectRoot=%s'", projectRoot)
 
 	// Prepare rpath flag if needed
-	var rpathFlag string
-	if pythonHome != "" {
-		pythonLibDir := filepath.Join(pythonHome, "lib")
-		switch runtime.GOOS {
-		case "darwin", "linux":
-			rpathFlag = fmt.Sprintf("-extldflags '-Wl,-rpath,%s'", pythonLibDir)
-		case "windows":
-			// Windows doesn't use rpath
-			rpathFlag = ""
-		default:
-			// Use Linux format for other Unix-like systems
-			rpathFlag = fmt.Sprintf("-extldflags '-Wl,-rpath=%s'", pythonLibDir)
-		}
+	pythonLibDir := env.GetPythonLibDir(projectRoot)
+	switch runtime.GOOS {
+	case "darwin", "linux":
+		ldflags += fmt.Sprintf(" -extldflags '-Wl,-rpath,%s'", pythonLibDir)
+	case "windows":
+		// Windows doesn't use rpath
+	default:
+		// Use Linux format for other Unix-like systems
+		ldflags += fmt.Sprintf(" -extldflags '-Wl,-rpath=%s'", pythonLibDir)
 	}
 
-	// Find existing -ldflags if any
-	foundLDFlags := false
 	for i := 0; i < len(args); i++ {
 		arg := args[i]
 		if strings.HasPrefix(arg, "-ldflags=") || arg == "-ldflags" {
-			foundLDFlags = true
-			// Copy everything before this arg
-			result = append(result, args[:i]...)
-
 			// Get existing flags
 			var existingFlags string
 			if strings.HasPrefix(arg, "-ldflags=") {
@@ -177,44 +164,15 @@
 				existingFlags = args[i+1]
 				i++ // Skip the next arg since we've consumed it
 			}
-
-			// Combine all flags
-			var allFlags []string
-			if len(xFlags) > 0 {
-				allFlags = append(allFlags, xFlags...)
-			}
-			if strings.TrimSpace(existingFlags) != "" {
-				allFlags = append(allFlags, existingFlags)
-			}
-			if rpathFlag != "" {
-				allFlags = append(allFlags, rpathFlag)
-			}
-
-			// Add combined ldflags
-			result = append(result, "-ldflags")
-			result = append(result, strings.Join(allFlags, " "))
-
-			// Add remaining args
-			result = append(result, args[i+1:]...)
-			break
-		}
-	}
-
-	// If no existing -ldflags found, add new ones at the beginning if we have any flags to add
-	if !foundLDFlags {
-		if len(xFlags) > 0 || rpathFlag != "" {
-			var allFlags []string
-			allFlags = append(allFlags, xFlags...)
-			if rpathFlag != "" {
-				allFlags = append(allFlags, rpathFlag)
+			existingFlags = strings.TrimSpace(existingFlags)
+			if ldflags != "" {
+				ldflags += " " + existingFlags
 			}
-			result = append(result, "-ldflags")
-			result = append(result, strings.Join(allFlags, " "))
+		} else {
+			result = append(result, arg)
 		}
-		result = append(result, args...)
 	}
-
-	return result
+	return append([]string{"-ldflags", ldflags}, result...)
 }
 
 // GetGoCommandHelp returns the formatted help text for the specified go command

inject.go

@@ -10,14 +10,23 @@
 var ProjectRoot string
 
 func init() {
+	injectDebug := os.Getenv("GP_INJECT_DEBUG")
 	if ProjectRoot == "" {
-		fmt.Fprintf(os.Stderr, "ProjectRoot is not set\n")
+		if injectDebug != "" {
+			panic("ProjectRoot is not set, compile with -ldflags '-X github.com/cpunion/go-python.ProjectRoot=/path/to/project'")
+		}
 		return
 	}
 	envs, err := env.ReadEnv(ProjectRoot)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to read env: %s\n", err)
-		return
+		panic(fmt.Sprintf("Failed to read env: %s", err))
+	}
+	if injectDebug != "" {
+		fmt.Fprintf(os.Stderr, "Injecting envs for project: %s\n", ProjectRoot)
+		for key, value := range envs {
+			fmt.Fprintf(os.Stderr, "  %s=%s\n", key, value)
+		}
+		fmt.Fprintf(os.Stderr, "End of envs\n")
 	}
 	for key, value := range envs {
 		os.Setenv(key, value)

internal/env/env.go

@@ -133,7 +133,7 @@ func ReadEnvFile(projectDir string) (map[string]string, error) {
 	envFile := GetEnvConfigPath(projectDir)
 	content, err := os.ReadFile(envFile)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read env file: %v", err)
+		return nil, fmt.Errorf("failed to read env file %s: %v", envFile, err)
 	}
 	envs := map[string]string{}
 	for _, line := range strings.Split(strings.TrimSpace(string(content)), "\n") {