Merge bitcoin/bitcoin#27708: Return EXIT_FAILURE on post-init fatal errors

61c569ab60 refactor: decouple early return commands from AppInit (furszy)
4927167f85 gui: return EXIT_FAILURE on post-init fatal errors (furszy)
3b2c61e819 Return EXIT_FAILURE on post-init fatal errors (furszy)
3c06926cf2 refactor: index: use `AbortNode` in fatal error helper (Sebastian Falbesoner)
9ddf7e03a3 move ThreadImport ABC error to use AbortNode (furszy)

Pull request description:

  It seems odd to return `EXIT_SUCCESS` when the node aborted execution due a fatal internal error
  or any post-init problem that triggers an unrequested shutdown.

  e.g. blocks or coins db I/O errors, disconnect block failure, failure during thread import (external
  blocks loading process error), among others.

ACKs for top commit:
  TheCharlatan:
    ACK 61c569ab60
  ryanofsky:
    Code review ACK 61c569ab60
  pinheadmz:
    ACK 61c569ab60
  theStack:
    Code-review ACK 61c569ab60

Tree-SHA512: 18a59c3acc1c6d12cbc74a20a401e89659740c6477fccb59070c9f97922dfe588468e9e5eef56c5f395762187c34179a5e3954aa5b844787fa13da2e666c63d3

src/qt/bitcoin.cpp

@@ -9,6 +9,7 @@
 #include <qt/bitcoin.h>
 
 #include <chainparams.h>
+#include <node/context.h>
 #include <common/args.h>
 #include <common/init.h>
 #include <common/system.h>
@@ -397,9 +398,7 @@ void BitcoinApplication::initializeResult(bool success, interfaces::BlockAndHead
 {
     qDebug() << __func__ << ": Initialization result: " << success;
 
-    // Set exit result.
-    returnValue = success ? EXIT_SUCCESS : EXIT_FAILURE;
-    if(success) {
+    if (success) {
         delete m_splash;
         m_splash = nullptr;
 
@@ -653,7 +652,6 @@ int GuiMain(int argc, char* argv[])
         app.InitPruneSetting(prune_MiB);
     }
 
-    int rv = EXIT_SUCCESS;
     try
     {
         app.createWindow(networkStyle.data());
@@ -666,10 +664,9 @@ int GuiMain(int argc, char* argv[])
             WinShutdownMonitor::registerShutdownBlockReason(QObject::tr("%1 didn't yet exit safely…").arg(PACKAGE_NAME), (HWND)app.getMainWinId());
 #endif
             app.exec();
-            rv = app.getReturnValue();
         } else {
             // A dialog with detailed error will have been shown by InitError()
-            rv = EXIT_FAILURE;
+            return EXIT_FAILURE;
         }
     } catch (const std::exception& e) {
         PrintExceptionContinue(&e, "Runaway exception");
@@ -678,5 +675,5 @@ int GuiMain(int argc, char* argv[])
         PrintExceptionContinue(nullptr, "Runaway exception");
         app.handleRunawayException(QString::fromStdString(app.node().getWarnings().translated));
     }
-    return rv;
+    return app.node().getExitStatus();
 }

src/qt/bitcoin.h

@@ -62,9 +62,6 @@ public:
     /// Request core initialization
     void requestInitialize();
 
-    /// Get process return value
-    int getReturnValue() const { return returnValue; }
-
     /// Get window identifier of QMainWindow (BitcoinGUI)
     WId getMainWinId() const;
 
@@ -104,7 +101,6 @@ private:
     PaymentServer* paymentServer{nullptr};
     WalletController* m_wallet_controller{nullptr};
 #endif
-    int returnValue{0};
     const PlatformStyle* platformStyle{nullptr};
     std::unique_ptr<QWidget> shutdownWindow;
     SplashScreen* m_splash = nullptr;