Disable Chromium crash handler

Chromium's crash handler prevents breakpad from creating crashdumps.
- add browser.crash.path: set minidump location
- add browser.crash.handler: call this program after crashing

1 files changed, 34 insertions, 10 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 9ae0dc1..6940856 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -23,7 +23,13 @@
 #endif
 
 #ifdef BreakpadEnabled
+
+struct BreakpadContext {
+    char *handler = nullptr;
+};
+
 #ifdef Q_OS_LINUX
+#include <unistd.h>
 #include <client/linux/handler/exception_handler.h>
 
 // bool filter_callback (void*)
@@ -33,14 +39,16 @@ static bool dumpCallback(const google_breakpad::MinidumpDescriptor &descriptor,
 {
     printf("Dump path: %s\n", descriptor.path());
 
-    if(auto *app = static_cast<Browser *>(context); app != nullptr) {
-        auto session = app->session();
-        QJsonDocument doc(session);
-        QFile sessionFile(QString("%1.json").arg(QString::fromStdString(descriptor.path())));
-        if(sessionFile.open(QIODevice::WriteOnly | QIODevice::Text)) {
-            sessionFile.write(qUtf8Printable(doc.toJson()));
-            sessionFile.flush();
-            sessionFile.close();
+    auto *ctx = static_cast<BreakpadContext *>(context);
+    if(ctx != nullptr) {
+        if(ctx->handler != nullptr) {
+            // fork and run 'handler master:commit path.dmp'
+            pid_t pid = fork();
+            if(pid == 0) {
+                char buffer[256];
+                snprintf(buffer, 256, "%s %s %s", ctx->handler, SMOLBOTE_BUILD, descriptor.path());
+                execlp("/bin/sh", "/bin/sh", "-c", buffer, (char *)nullptr);
+            }
         }
     }
 
@@ -59,6 +67,13 @@ int main(int argc, char **argv)
     }
 #endif
 
+    // Disable Chromium's crash handler so breakpad can capture crashes instead.
+    // This has to be done before QtWebEngine gets initialized.
+    const auto chromiumFlags = qgetenv("QTWEBENGINE_CHROMIUM_FLAGS");
+    if (!chromiumFlags.contains("disable-in-process-stack-traces")) {
+        qputenv("QTWEBENGINE_CHROMIUM_FLAGS", chromiumFlags + " --disable-in-process-stack-traces");
+    }
+
     // create and load configuration
     std::unique_ptr<Configuration> config = std::make_unique<Configuration>(nullptr);
 #ifdef QT_DEBUG
@@ -133,10 +148,19 @@ int main(int argc, char **argv)
     app.setAttribute(Qt::AA_DontCreateNativeWidgetSiblings, true);
 
 #ifdef BreakpadEnabled
-    google_breakpad::MinidumpDescriptor descriptor("/tmp");
+    BreakpadContext ctx;
+    google_breakpad::MinidumpDescriptor descriptor(config->value<std::string>("browser.crash.path").value_or("/tmp").c_str());
+
+    const auto crashHandler = config->value<std::string>("browser.crash.handler");
+    if(crashHandler) {
+        const int length = crashHandler.value().length() + 1;
+        ctx.handler = new char[length];
+        crashHandler.value().copy(ctx.handler, length - 1);
+        ctx.handler[length - 1] = '\0';
+    }
 
     // minidump descriptor, filter callback, minidump callback, callback_context, install handler, server_fd
-    google_breakpad::ExceptionHandler eh(descriptor, nullptr, dumpCallback, &app, true, -1);
+    google_breakpad::ExceptionHandler eh(descriptor, nullptr, dumpCallback, &ctx, true, -1);
 #endif
 
     // translator