From bf6ee5e65f122076caa6a2a3773bdc0283f1db83 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gon=C3=A7alo=20Negrier=20Duarte?=
 <gonegrier.duarte@gmail.com>
Date: Wed, 17 Apr 2024 18:21:34 +0100
Subject: [PATCH] Revert "Make ScopedProcessRunner hold the child until we
 register with systemd"

This reverts commit 152fa94b5fb2c3226b0f8f7975c1f06bec4ecdaa.
---
 src/gui/systemd/scopedprocessrunner.cpp | 26 +++----------------------
 src/gui/systemd/scopedprocessrunner_p.h |  3 ++-
 2 files changed, 5 insertions(+), 24 deletions(-)

diff --git a/src/gui/systemd/scopedprocessrunner.cpp b/src/gui/systemd/scopedprocessrunner.cpp
index d9b165534..ff95e41b2 100644
--- a/src/gui/systemd/scopedprocessrunner.cpp
+++ b/src/gui/systemd/scopedprocessrunner.cpp
@@ -3,8 +3,6 @@
 #include "scopedprocessrunner_p.h"
 #include "systemdprocessrunner_p.h"
 
-#include <sys/eventfd.h>
-
 using namespace org::freedesktop;
 
 ScopedProcessRunner::ScopedProcessRunner()
@@ -12,23 +10,9 @@ ScopedProcessRunner::ScopedProcessRunner()
 {
 }
 
-void ScopedProcessRunner::startProcess()
+void ScopedProcessRunner::slotProcessStarted()
 {
-    std::function oldModifier = m_process->childProcessModifier();
-    int efd = eventfd(0, EFD_CLOEXEC);
-    m_process->setChildProcessModifier([efd, oldModifier]() {
-        // wait for the parent process to be done registering the transient unit
-        eventfd_read(efd, nullptr);
-        if (oldModifier)
-            oldModifier();
-    });
-
-    // actually start
-    ForkingProcessRunner::startProcess();
-    m_process->setChildProcessModifier(oldModifier);
-
-    Q_ASSERT(m_process->processId());
-
+    ForkingProcessRunner::slotProcessStarted();
     // As specified in "XDG standardization for applications" in https://systemd.io/DESKTOP_ENVIRONMENTS/
     const QString serviceName = QStringLiteral("app-%1-%2.scope").arg(escapeUnitName(resolveServiceAlias()), QUuid::createUuid().toString(QUuid::Id128));
 
@@ -46,7 +30,7 @@ void ScopedProcessRunner::startProcess()
                                     {} // aux is currently unused and should be passed as empty array.
         );
 
-    connect(new QDBusPendingCallWatcher(startReply, this), &QDBusPendingCallWatcher::finished, [serviceName, efd](QDBusPendingCallWatcher *watcher) {
+    connect(new QDBusPendingCallWatcher(startReply, this), &QDBusPendingCallWatcher::finished, [serviceName](QDBusPendingCallWatcher *watcher) {
         QDBusPendingReply<QDBusObjectPath> reply = *watcher;
         watcher->deleteLater();
         if (reply.isError()) {
@@ -54,10 +38,6 @@ void ScopedProcessRunner::startProcess()
         } else {
             qCDebug(KIO_GUI) << "Successfully registered new cgroup:" << serviceName;
         }
-
-        // release child and close the eventfd
-        eventfd_write(efd, 1);
-        close(efd);
     });
 }
 
diff --git a/src/gui/systemd/scopedprocessrunner_p.h b/src/gui/systemd/scopedprocessrunner_p.h
index eae39edcc..c7498ed3f 100644
--- a/src/gui/systemd/scopedprocessrunner_p.h
+++ b/src/gui/systemd/scopedprocessrunner_p.h
@@ -7,7 +7,8 @@ class ScopedProcessRunner : public ForkingProcessRunner
     Q_OBJECT
 public:
     explicit ScopedProcessRunner();
-    void startProcess() override;
+private Q_SLOTS:
+    void slotProcessStarted() override;
 };
 
 #endif // SCOPEDPROCESSRUNNER_H
-- 
2.44.0