[ARM] Fix #32098: az bicep install: Fix a bug where the installation was skipped when --version was specified unless bicep.use_binary_from_path was explicitly set to false (#32337)

Author: shenglol

src/azure-cli/azure/cli/command_modules/resource/_bicep.py

@@ -115,14 +115,17 @@ def run_bicep_command(cli_ctx, args, auto_install=True, custom_env=None):
 
 
 def ensure_bicep_installation(cli_ctx, release_tag=None, target_platform=None, stdout=True):
-    if _use_binary_from_path(cli_ctx):
+    if _use_binary_from_path(cli_ctx) and release_tag is None:
+        # Only use the Bicep executable from PATH when no specific version is requested.
         from shutil import which
 
         if which("bicep") is None:
             raise ValidationError(
                 'Could not find the "bicep" executable on PATH. To install Bicep via Azure CLI, set the "bicep.use_binary_from_path" configuration to False and run "az bicep install".'  # pylint: disable=line-too-long
             )
 
+        _logger.debug("Using Bicep CLI from PATH.")
+
         return
 
     system = platform.system()
@@ -131,11 +134,13 @@ def ensure_bicep_installation(cli_ctx, release_tag=None, target_platform=None, s
 
     if os.path.isfile(installation_path):
         if not release_tag:
+            print(f"Bicep CLI is already installed at '{installation_path}'. Skipping installation as no specific version was requested.")  # pylint: disable=line-too-long
             return
 
         installed_version = _get_bicep_installed_version(installation_path)
         target_version = _extract_version(release_tag)
         if installed_version and target_version and installed_version == target_version:
+            print(f"Bicep CLI {installed_version} is already installed at '{installation_path}'.")
             return
 
     installation_dir = os.path.dirname(installation_path)

src/azure-cli/azure/cli/command_modules/resource/tests/latest/test_resource_bicep.py

@@ -84,7 +84,7 @@ def test_use_bicep_cli_from_path_false_after_install(
         response.read.return_value = b"test"
         urlopen_stub.return_value = response
 
-        user_binary_from_path_stub.return_value = False
+        user_binary_from_path_stub.return_value = True
         get_use_binary_from_path_config_stub.return_value = "if_found_in_ci"
 
         # Act
@@ -206,13 +206,13 @@ def test_ensure_bicep_installation_skip_download_if_installed_version_matches_re
     @mock.patch("azure.cli.command_modules.resource._bicep.get_use_binary_from_path_config")
     @mock.patch("azure.cli.command_modules.resource._bicep._get_bicep_installation_path")
     @mock.patch("shutil.which")
-    def test_ensure_bicep_installation_skip_download_if_use_binary_from_path_is_true(
+    def test_ensure_bicep_installation_skip_download_if_use_binary_from_path_is_true_and_no_version_is_specified(
         self, which_stub, _get_bicep_installation_path_mock, get_use_binary_from_path_config_stub
     ):
         which_stub.return_value = True
         get_use_binary_from_path_config_stub.return_value = "true"
 
-        ensure_bicep_installation(self.cli_ctx, release_tag="v0.1.0")
+        ensure_bicep_installation(self.cli_ctx, release_tag=None)
 
         _get_bicep_installation_path_mock.assert_not_called()