core/process: ignore environment changes made by the Env pragma

This pragma ends up used to set things like QQC theme which
shouldn't be cascaded into child processes.

src/core/common.cpp

@@ -1,9 +1,11 @@
 #include "common.hpp"
 
 #include <qdatetime.h>
+#include <qprocess.h>
 
 namespace qs {
 
 const QDateTime Common::LAUNCH_TIME = QDateTime::currentDateTime();
+QProcessEnvironment Common::INITIAL_ENVIRONMENT = {}; // NOLINT
 
-}
+} // namespace qs

src/core/common.hpp

@@ -1,11 +1,13 @@
 #pragma once
 
 #include <qdatetime.h>
+#include <qprocess.h>
 
 namespace qs {
 
 struct Common {
 	static const QDateTime LAUNCH_TIME;
+	static QProcessEnvironment INITIAL_ENVIRONMENT; // NOLINT
 };
 
 } // namespace qs

src/core/desktopentry.cpp

@@ -16,6 +16,7 @@
 #include <qtenvironmentvariables.h>
 #include <ranges>
 
+#include "common.hpp"
 #include "model.hpp"
 
 namespace {
@@ -260,6 +261,7 @@ void DesktopEntry::doExec(const QString& execString, const QString& workingDirec
 	process.setProgram(args.at(0));
 	process.setArguments(args.sliced(1));
 	if (!workingDirectory.isEmpty()) process.setWorkingDirectory(workingDirectory);
+	process.setProcessEnvironment(qs::Common::INITIAL_ENVIRONMENT);
 	process.startDetached();
 }
 

src/io/process.cpp

@@ -13,6 +13,7 @@
 #include <qtypes.h>
 #include <qvariant.h>
 
+#include "../core/common.hpp"
 #include "../core/generation.hpp"
 #include "../core/qmlglobal.hpp"
 #include "datastream.hpp"
@@ -223,26 +224,24 @@ void Process::setupEnvironment(QProcess* process) {
 		process->setWorkingDirectory(this->mWorkingDirectory);
 	}
 
-	if (!this->mEnvironment.isEmpty() || this->mClearEnvironment) {
-		auto sysenv = QProcessEnvironment::systemEnvironment();
-		auto env = this->mClearEnvironment ? QProcessEnvironment() : sysenv;
+	const auto& sysenv = qs::Common::INITIAL_ENVIRONMENT;
+	auto env = this->mClearEnvironment ? QProcessEnvironment() : sysenv;
 
-		for (auto& name: this->mEnvironment.keys()) {
-			auto value = this->mEnvironment.value(name);
-			if (!value.isValid()) continue;
+	for (auto& name: this->mEnvironment.keys()) {
+		auto value = this->mEnvironment.value(name);
+		if (!value.isValid()) continue;
 
-			if (this->mClearEnvironment) {
-				if (value.isNull()) {
-					if (sysenv.contains(name)) env.insert(name, sysenv.value(name));
-				} else env.insert(name, value.toString());
-			} else {
-				if (value.isNull()) env.remove(name);
-				else env.insert(name, value.toString());
-			}
+		if (this->mClearEnvironment) {
+			if (value.isNull()) {
+				if (sysenv.contains(name)) env.insert(name, sysenv.value(name));
+			} else env.insert(name, value.toString());
+		} else {
+			if (value.isNull()) env.remove(name);
+			else env.insert(name, value.toString());
 		}
-
-		process->setProcessEnvironment(env);
 	}
+
+	process->setProcessEnvironment(env);
 }
 
 void Process::onStarted() {

src/launch/launch.cpp

@@ -9,6 +9,7 @@
 #include <qlist.h>
 #include <qlogging.h>
 #include <qnamespace.h>
+#include <qprocess.h>
 #include <qqmldebug.h>
 #include <qquickwindow.h>
 #include <qstring.h>
@@ -151,6 +152,8 @@ int launch(const LaunchArgs& args, char** argv, QCoreApplication* coreApplicatio
 	QsPaths::instance()->linkPathDir();
 	LogManager::initFs();
 
+	Common::INITIAL_ENVIRONMENT = QProcessEnvironment::systemEnvironment();
+
 	for (auto [var, val]: pragmas.envOverrides.asKeyValueRange()) {
 		qputenv(var.toUtf8(), val.toUtf8());
 	}