Fix re-run smart build bug

smartsim/_core/_cli/build.py

@@ -1,4 +1,5 @@
 import argparse
+import os
 import sys
 from pathlib import Path
 
@@ -9,6 +10,8 @@
 from smartsim._core._install import builder
 from smartsim._core._install.buildenv import BuildEnv, SetupError, Version_, Versioner
 from smartsim._core._install.builder import BuildError
+from smartsim._core.config import CONFIG
+from smartsim._core.utils.helpers import installed_redisai_backends
 from smartsim.log import get_logger
 
 smart_logger_format = "[%(name)s] %(levelname)s %(message)s"
@@ -97,6 +100,13 @@ def __init__(self):
                 str(args.device), pt, tf, onnx, args.torch_dir, args.libtensorflow_dir
             )
 
+            backends = [
+                backend.capitalize() for backend in installed_redisai_backends()
+            ]
+            logger.info(
+                (", ".join(backends) if backends else "No") + " backend(s) built"
+            )
+
         except (SetupError, BuildError) as e:
             logger.error(str(e))
             exit(1)
@@ -144,6 +154,12 @@ def build_redis_ai(
         print(f"    ONNX {self.versions.ONNX}: {color_bool(onnx)}\n")
         print(f"Building for GPU support: {color_bool(device == 'gpu')}\n")
 
+        if os.path.isdir(CONFIG.lib_path) and os.listdir(CONFIG.lib_path):
+            logger.error(
+                "If you wish to re-run `smart build`, you must first run `smart clean`."
+            )
+            exit(1)
+
         # Check for onnx and tf in user python environemnt and prompt user
         # to download them if they are not installed. this should not break
         # the build however, as we use onnx and tf directly from RAI instead