feat(tools): Imporve activate.py debug information

tools/activate.py

@@ -14,7 +14,7 @@
 
 
 def die(msg: str) -> None:
-    sys.exit(f'error: {msg}')
+    sys.exit(f'\nERROR: {msg}')
 
 
 idf_tools_path = os.path.realpath(os.path.dirname(__file__))
@@ -37,7 +37,11 @@ def die(msg: str) -> None:
 os.environ['IDF_PYTHON_ENV_PATH'] = idf_python_env_path
 os.environ['ESP_IDF_VERSION'] = idf_version
 
+if not os.path.exists(virtualenv_python):
+    die(f'ESP-IDF Python virtual environment not found. Please run the install script to set it up before proceeding.')
+
 try:
     run([virtualenv_python, os.path.join(idf_path, 'tools', 'export_utils', 'activate_venv.py')] + sys.argv[1:], check=True)
 except (OSError, SubprocessError):
-    die(f'Activation script failed')
+    die('\n'.join(['Activation script failed',
+                   'To view detailed debug information, set ESP_IDF_EXPORT_DEBUG=1 and run the export script again.']))

tools/export_utils/activate_venv.py

@@ -87,9 +87,16 @@ def get_idf_env() -> Dict[str,str]:
         'IDF_PYTHON_ENV_PATH': os.environ['IDF_PYTHON_ENV_PATH'],
     }
 
-    for line in stdout.splitlines():
-        var, val = line.split('=')
-        idf_env[var] = val
+    try:
+        for line in stdout.splitlines():
+            var, val = line.split('=')
+            idf_env[var] = val
+    except ValueError as e:
+        debug('\n'.join(['Output from `./tools/idf_tools.py export --format key-value`:',
+                         f'{stdout}']))
+        raise ValueError('\n'.join(['Please ensure your ESP-IDF installation is clean, especially file `./tools/idf_tools.py`.',
+                                    'The command `./tools/idf_tools.py export` appears to be returning unexpected values.',
+                                    f'Details: {e}']))
 
     if 'PATH' in idf_env:
         idf_env['PATH'] = os.pathsep.join([extra_paths, idf_env['PATH']])