bpo-37283: Ensure command-line and unattend.xml setting override previously detected states in Windows installer (GH-15759)

(cherry picked from commit 3a0ddbcdfcbc0f4372905fabf81e093f1b043e99)

Co-authored-by: Steve Dower <steve.dower@python.org>

2 files changed, 25 insertions, 8 deletions

diff --git a/Tools/msi/bundle/bootstrap/PythonBootstrapperApplication.cpp b/Tools/msi/bundle/bootstrap/PythonBootstrapperApplication.cpp
index 2e468b7e57..cd4a1f8feb 100644
--- a/Tools/msi/bundle/bootstrap/PythonBootstrapperApplication.cpp
+++ b/Tools/msi/bundle/bootstrap/PythonBootstrapperApplication.cpp
@@ -727,9 +727,13 @@ public: // IBootstrapperApplication
                 BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "Failed to load AssociateFiles state: error code 0x%08X", hr);
             }
 
-            _engine->SetVariableNumeric(L"Include_launcher", 1);
+            LONGLONG includeLauncher;
+            if (FAILED(BalGetNumericVariable(L"Include_launcher", &includeLauncher))
+                || includeLauncher == -1) {
+                _engine->SetVariableNumeric(L"Include_launcher", 1);
+                _engine->SetVariableNumeric(L"InstallLauncherAllUsers", fPerMachine ? 1 : 0);
+            }
             _engine->SetVariableNumeric(L"DetectedOldLauncher", 1);
-            _engine->SetVariableNumeric(L"InstallLauncherAllUsers", fPerMachine ? 1 : 0);
         }
         return CheckCanceled() ? IDCANCEL : IDNOACTION;
     }
@@ -796,6 +800,12 @@ public: // IBootstrapperApplication
             }
         }
 
+        LONGLONG includeLauncher;
+        if (SUCCEEDED(BalGetNumericVariable(L"Include_launcher", &includeLauncher))
+            && includeLauncher != -1) {
+            detectedLauncher = FALSE;
+        }
+
         if (detectedLauncher) {
             /* When we detect the current version of the launcher. */
             _engine->SetVariableNumeric(L"Include_launcher", 1);
@@ -820,6 +830,14 @@ public: // IBootstrapperApplication
         }
 
         if (SUCCEEDED(hrStatus)) {
+            LONGLONG includeLauncher;
+            if (SUCCEEDED(BalGetNumericVariable(L"Include_launcher", &includeLauncher))
+                && includeLauncher == -1) {
+                _engine->SetVariableNumeric(L"Include_launcher", 1);
+            }
+        }
+
+        if (SUCCEEDED(hrStatus)) {
             hrStatus = EvaluateConditions();
         }
 
@@ -1451,6 +1469,10 @@ private:
         hr = ParseOverridableVariablesFromXml(pixdManifest);
         BalExitOnFailure(hr, "Failed to read overridable variables.");
 
+        if (_command.action == BOOTSTRAPPER_ACTION_MODIFY) {
+            LoadOptionalFeatureStates(_engine);
+        }
+
         hr = ParseVariablesFromUnattendXml();
         ExitOnFailure(hr, "Failed to read unattend.ini file.");
 
@@ -1478,10 +1500,6 @@ private:
         hr = UpdateUIStrings(_command.action);
         BalExitOnFailure(hr, "Failed to load UI strings.");
 
-        if (_command.action == BOOTSTRAPPER_ACTION_MODIFY) {
-            LoadOptionalFeatureStates(_engine);
-        }
-
         GetBundleFileVersion();
         // don't fail if we couldn't get the version info; best-effort only
     LExit:
diff --git a/Tools/msi/bundle/bundle.wxs b/Tools/msi/bundle/bundle.wxs
index f6cff6fc35..ddd6870f62 100644
--- a/Tools/msi/bundle/bundle.wxs
+++ b/Tools/msi/bundle/bundle.wxs
@@ -71,11 +71,10 @@
     <Variable Name="Include_tools" Value="1" bal:Overridable="yes" />
     <Variable Name="Include_tcltk" Value="1" bal:Overridable="yes" />
     <Variable Name="Include_pip" Value="1" bal:Overridable="yes" />
+    <Variable Name="Include_launcher" Value="-1" bal:Overridable="yes" />
     <?if "$(var.PyTestExt)"="" ?>
-    <Variable Name="Include_launcher" Value="1" bal:Overridable="yes" />
     <Variable Name="Include_launcherState" Value="enabled" bal:Overridable="yes" />
     <?else ?>
-    <Variable Name="Include_launcher" Value="0" />
     <Variable Name="Include_launcherState" Value="disable" />
     <?endif ?>
     <Variable Name="Include_symbols" Value="0" bal:Overridable="yes" />