add inject debug log

inject.go

@@ -10,13 +10,21 @@ import (
 var ProjectRoot string
 
 func init() {
+	injectDebug := os.Getenv("INJECT_DEBUG")
 	if ProjectRoot == "" {
-		panic("ProjectRoot is not set, compile with -ldflags '-X github.com/cpunion/go-python.ProjectRoot=/path/to/project/.deps'")
+		panic("ProjectRoot is not set, compile with -ldflags '-X github.com/cpunion/go-python.ProjectRoot=/path/to/project'")
 	}
 	envs, err := env.ReadEnv(ProjectRoot)
 	if err != nil {
 		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)
 	}