Change debconf frontend to noninteractive

.gitignore

@@ -1 +1,2 @@
 CMakeLists.txt.user
+build

CMakeLists.txt

@@ -9,8 +9,7 @@ set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets LinguistTools)
-find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets LinguistTools)
+find_package(Qt6 REQUIRED COMPONENTS Widgets DBus LinguistTools)
 
 set(TS_FILES
 	src/translations/lubuntu-update_en_US.ts
@@ -36,16 +35,22 @@ set(PROJECT_SOURCES
         src/conffilehandlerdialog.h
         src/conffilehandlerdialog.cpp
         src/conffilehandlerdialog.ui
-        src/ipcfilewatcher.h
-        src/ipcfilewatcher.cpp
+        src/releaseupgradewindow.h
+        src/releaseupgradewindow.cpp
+        src/releaseupgradewindow.ui
+        src/upgradedelaywindow.h
+        src/upgradedelaywindow.cpp
+        src/upgradedelaywindow.ui
+        src/windowshowwatcher.h
+        src/windowshowwatcher.cpp
         ${TS_FILES}
 )
 
 set(TRANSLATION_RESOURCES "src/translations.qrc")
 
 configure_file(${TRANSLATION_RESOURCES} translations.qrc COPYONLY)
-qt5_add_translation(QM_FILES ${TS_FILES})
-qt5_add_resources(QM_RESOURCES ${CMAKE_CURRENT_BINARY_DIR}/translations.qrc)
+qt6_add_translation(QM_FILES ${TS_FILES})
+qt6_add_resources(QM_RESOURCES ${CMAKE_CURRENT_BINARY_DIR}/translations.qrc)
 
 add_custom_target(translations ALL DEPENDS ${QM_FILES})
 
@@ -57,7 +62,9 @@ add_executable(lubuntu-update
 
 add_dependencies(lubuntu-update translations)
 
-target_link_libraries(lubuntu-update PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
+target_link_libraries(lubuntu-update PRIVATE
+    Qt6::Widgets
+    Qt6::DBus)
 
 install(TARGETS lubuntu-update
     BUNDLE DESTINATION .

README.md

@@ -2,7 +2,7 @@
 
 Copyright (c) 2023-2024 Lubuntu Contributors. Licensed under the GNU General Public License version 2, or (at your option) any later version.
 
-Build dependencies are Qt 5.15 and cmake, runtime dependencies are apt, apt-get, and diff.
+Build dependencies are Qt 5.15 and cmake, runtime dependencies are apt, apt-get, curl, and diff.
 
 To build:
 
@@ -20,6 +20,11 @@ It is highly recommended that you use a Lubuntu virtual machine for testing and
 
 Qt Creator is recommended for editing the code. It is present in Ubuntu's official repos and can be installed using `sudo apt install qtcreator`.
 
+## Config file format:
+There's only one field here:
+
+* nextDoReleaseUpgradeNotify=123456789 - Value is number of seconds since the UNIX epoch. Used to determine when to offer the user an upgrade.
+
 ## Missing features
 
 * Double-clicking on a package doesn't show detailed information for it yet.

debian/changelog

@@ -1,3 +1,46 @@
+lubuntu-update-notifier (1.1.1) plucky; urgency=medium
+
+  * Switch debconf frontend to noninteractive. (LP: #2091704)
+
+ -- Aaron Rainbolt <arraybolt3@ubuntu.com>  Tue, 24 Dec 2024 13:51:28 -0600
+
+lubuntu-update-notifier (1.1.0) oracular; urgency=medium
+
+  * Port to Qt6.
+
+ -- Aaron Rainbolt <arraybolt3@ubuntu.com>  Thu, 15 Aug 2024 16:58:41 -0500
+
+lubuntu-update-notifier (1.0.0) noble; urgency=medium
+
+  * Change from beta to final release.
+  * Use D-Bus as a window show trigger rather than clunky drop files, this
+    will prevent issues if multiple users are logged in at once.
+
+ -- Aaron Rainbolt <arraybolt3@ubuntu.com>  Mon, 25 Mar 2024 16:15:49 -0500
+
+lubuntu-update-notifier (1.0.0~beta1) noble; urgency=medium
+
+  * Change from alpha to beta testing phase, this has been tested for a while
+    and looks pretty stable so far.
+  * Wait to start until lxqt-notificationd is present. (LP: #2056379)
+
+ -- Aaron Rainbolt <arraybolt3@ubuntu.com>  Thu, 07 Mar 2024 04:06:13 +0000
+
+lubuntu-update-notifier (1.0.0~alpha4) noble; urgency=medium
+
+  * Fix infinite loop when no eligible new release is available.
+  * Fix a bug where only the first eligible new release would be considered.
+
+ -- Aaron Rainbolt <arraybolt3@ubuntu.com>  Fri, 09 Feb 2024 22:26:59 +0000
+
+lubuntu-update-notifier (1.0.0~alpha3) noble; urgency=medium
+
+  * New feature release. Notable additions:
+    - do-release-upgrade support
+  * Updated runtime dependencies.
+
+ -- Aaron Rainbolt <arraybolt3@ubuntu.com>  Fri, 02 Feb 2024 11:37:36 -0600
+
 lubuntu-update-notifier (1.0.0~alpha2) noble; urgency=medium
 
   * New feature release. Notable additions:

debian/control

@@ -5,14 +5,15 @@ Maintainer: Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
 Build-Depends: cmake,
                debhelper-compat (= 13),
                lxqt-sudo (>= 1.4.0-0ubuntu2),
-               qtbase5-dev,
-               qttools5-dev
+               qt6-base-dev,
+               qt6-tools-dev
 Standards-Version: 4.6.2
 Rules-Requires-Root: no
 
 Package: lubuntu-update-notifier
 Architecture: any
-Depends: ${misc:Depends},
+Depends: curl,
+         ${misc:Depends},
          ${shlibs:Depends}
 Description: Lubuntu's update installer
  Lubuntu Update is an enhanced, modern update installer for the Lubuntu

debian/files

@@ -0,0 +1 @@
+lubuntu-update-notifier_1.1.0~ppa1_source.buildinfo admin optional

src/aptmanager.cpp

@@ -88,10 +88,10 @@ void AptManager::handleUpdateProcessBuffer()
         // yes, this gave me a headache also
         if (dlLineMatch.hasMatch()) { // Increments the progress counter for each package downloaded
             internalUpdateProgress++;
-        } else if (line.count() >= 25 && line.left(24) == "Preparing to unpack .../" && numPackagesToPrep != 0) {
+        } else if (line.length() >= 25 && line.left(24) == "Preparing to unpack .../" && numPackagesToPrep != 0) {
             internalUpdateProgress++; // Increments the progress counter for each package that is "prepared to unpack"
             numPackagesToPrep--;
-        } else if (line.count() >= 10 && line.left(9) == "Unpacking") {
+        } else if (line.length() >= 10 && line.left(9) == "Unpacking") {
             /*
              * Increments the progress counter for each package that is unpacked
              * The package name may be suffixed with ":amd64" or some other
@@ -109,7 +109,7 @@ void AptManager::handleUpdateProcessBuffer()
                     internalUpdateProgress++;
                 }
             }
-        } else if (line.count() >= 11 && line.left(10) == "Setting up") {
+        } else if (line.length() >= 11 && line.left(10) == "Setting up") {
             QStringList parts = line.split(' ');
             QString packageName;
             if (parts.count() >= 3) {
@@ -118,7 +118,7 @@ void AptManager::handleUpdateProcessBuffer()
                     internalUpdateProgress++;
                 }
             }
-        } else if (line.count() >= 9 && line.left(8) == "Removing") {
+        } else if (line.length() >= 9 && line.left(8) == "Removing") {
             QStringList parts = line.split(' ');
             QString packageName;
             if (parts.count() >= 2) {
@@ -136,7 +136,7 @@ void AptManager::handleUpdateProcessBuffer()
                 }
                 aptProcess->readLine(lineBuf, 2048);
                 QString confLine = QString(lineBuf);
-                confLine = confLine.left(confLine.count() - 2);
+                confLine = confLine.left(confLine.length() - 2);
                 if (confLine == "Lubuntu Update !!! CONFIGURATION FILE LIST END") {
                     emit conffileListReady(conffileList); // this triggers the main window to show the conffile handler window
                     break;
@@ -144,6 +144,15 @@ void AptManager::handleUpdateProcessBuffer()
                     conffileList.append(confLine);
                 }
             }
+        } else if (line == "Lubuntu Update !!! NEW RELEASE\r\n") {
+            // Same busy-wait technique, but here we're just getting one extra line, the release code.
+            while (!aptProcess->canReadLine()) {
+                QThread::msleep(20);
+            }
+            aptProcess->readLine(lineBuf, 2048);
+            QString releaseCode = QString(lineBuf);
+        releaseCode = releaseCode.left(releaseCode.length() - 2);
+            emit newRelease(releaseCode);
         }
 
         double percentageDone = (static_cast<double>(internalUpdateProgress) / (((internalUpdateInfo[0].count() + internalUpdateInfo[1].count()) * 4) + internalUpdateInfo[2].count())) * 100;
@@ -237,7 +246,7 @@ QList<QStringList> AptManager::getUpdateInfo()
                  * spaces, we know we're no longer reading a package list.
                  */
 
-                if (stdoutLine.count() < 3 || stdoutLine.left(2) != "  ") {
+                if (stdoutLine.length() < 3 || stdoutLine.left(2) != "  ") {
                     gettingInstallPackages = false;
                     gettingUpgradePackages = false;
                     gettingUninstallPackages = false;
@@ -308,7 +317,7 @@ QStringList AptManager::getSecurityUpdateList()
     QString distroLine;
     while (distroFinder.readLineInto(&distroLine)) {
         // The line has to be at least 18 characters long - 16 for the string "DISTRIB_CODENAME", one for the = sign, and one for a codename with a length of at least one.
-        if (distroLine.count() >= 18 && distroLine.left(16) == "DISTRIB_CODENAME") {
+        if (distroLine.length() >= 18 && distroLine.left(16) == "DISTRIB_CODENAME") {
             QStringList distroParts = distroLine.split('=');
             if (distroParts.count() >= 2) {
                 distroName = distroParts[1];

src/aptmanager.h

@@ -28,6 +28,7 @@ signals:
     void progressUpdated(int progress);
     void logLineReady(QString logLine);
     void conffileListReady(QStringList conffileList);
+    void newRelease(QString code);
 
 private slots:
     void handleUpdateProcessBuffer();

src/ipcfilewatcher.cpp

@@ -1,38 +0,0 @@
-#include "ipcfilewatcher.h"
-
-#include <QApplication>
-#include <QDir>
-#include <QFile>
-#include <QFileSystemWatcher>
-
-#include <QDebug>
-
-IPCFileWatcher::IPCFileWatcher(QObject *parent)
-    : QObject{parent}
-{
-    QDir targetDir("/dev/shm/lubuntu-update");
-    bool couldRemove = targetDir.removeRecursively();
-    if (!couldRemove) {
-        qCritical() << "Could not clear IPC directory. Ensure that /dev/shm and /dev/shm/lubuntu-update are world-readable and world-writable.";
-        initFailed = true;
-        return;
-    }
-    targetDir.mkdir("/dev/shm/lubuntu-update");
-    QFileSystemWatcher *watcher = new QFileSystemWatcher(QStringList() << "/dev/shm/lubuntu-update");
-    connect(watcher, &QFileSystemWatcher::directoryChanged, this, &IPCFileWatcher::checkForShowWindowFile);
-    initFailed = false;
-}
-
-bool IPCFileWatcher::didInitFail()
-{
-    return initFailed;
-}
-
-void IPCFileWatcher::checkForShowWindowFile()
-{
-    QFile flagFile("/dev/shm/lubuntu-update/lubuntu-update-show-win");
-    if (flagFile.exists()) {
-        flagFile.remove();
-        emit showWindowFlagDetected();
-    }
-}

src/ipcfilewatcher.h

@@ -1,22 +0,0 @@
-#ifndef IPCFILEWATCHER_H
-#define IPCFILEWATCHER_H
-
-#include <QObject>
-
-class IPCFileWatcher : public QObject
-{
-    Q_OBJECT
-public:
-    explicit IPCFileWatcher(QObject *parent = nullptr);
-    bool didInitFail();
-
-signals:
-    void showWindowFlagDetected();
-
-private:
-    bool initFailed;
-
-    void checkForShowWindowFile();
-};
-
-#endif // IPCFILEWATCHER_H

src/lubuntu-update-backend

@@ -4,6 +4,43 @@
 set -e
 export LC_ALL='C'
 
+# Returns 0 if the release is supported, 1 if unsupported, 2 if if didn't exist at all, and 3 if something went wrong.
+isReleaseSupported () {
+	releaseYear="${1:-}";
+	releaseMonth="${2:-}";
+	metaReleaseStr="${3:-}";
+
+	if [ -z "$releaseYear" ]; then
+		echo '! ! ! releaseYear is blank';
+		return 3;
+	elif [ -z "$releaseMonth" ]; then
+		echo '! ! ! releaseMonth is blank';
+		return 3;
+	elif [ -z "$metaReleaseStr" ]; then
+		echo '! ! ! metaReleaseStr is blank';
+		return 3;
+	fi
+
+	releaseCode="$releaseYear.$releaseMonth";
+	scanForSupported='n';
+
+	while IFS= read -r line || [[ -n $line ]]; do
+		if [[ "$line" =~ $releaseCode ]]; then
+			scanForSupported='y';
+		fi
+		if [ "$scanForSupported" = 'y' ]; then
+			if [[ "$line" =~ Supported ]]; then
+				if [ "$(echo "$line" | cut -d':' -f2 | tail -c+2)" = '0' ]; then
+					return 1;
+				else
+					return 0;
+				fi
+			fi
+		fi
+	done < <(printf '%s' "$metaReleaseStr")
+	return 2;
+}
+
 if [ "$1" = 'pkgver' ]; then
 	shift
 	while [ "$1" != '' ]; do
@@ -29,66 +66,128 @@ elif [ "$1" = 'doupdate' ]; then
 	dpkg --configure -a
 
 	# Run the real update
-	DEBIAN_FRONTEND='kde' apt-get -o Dpkg::Options::='--force-confdef' -o Dpkg::Options::='--force-confold' -o Apt::Color='0' -o Dpkg::Use-Pty='0' -y dist-upgrade |& tee /run/lubuntu-update-apt-log
+	DEBIAN_FRONTEND='noninteractive' apt-get -o Dpkg::Options::='--force-confdef' -o Dpkg::Options::='--force-confold' -o Apt::Color='0' -o Dpkg::Use-Pty='0' -y dist-upgrade |& tee /run/lubuntu-update-apt-log
 
 	# Find all the conffiles
+	doConffiles='y';
 	mapfile conffileRawList <<< "$(grep -P "^Configuration file \'.*\'$" '/run/lubuntu-update-apt-log')"
 	if [ "$(echo "${conffileRawList[0]}" | head -c1)" != 'C' ]; then # Empty or invalid list, we're done
-		exit 0
+		doConffiles='n';
 	fi
 
-	conffileList=()
-	counter=0
-	while [ "$counter" -lt "${#conffileRawList[@]}" ]; do
-		# Cut off "Configuration file '" from the start and "'" plus a couple trailing characters from the end
-		conffileList[counter]="$(echo "${conffileRawList[$counter]}" | tail -c+21 | head -c-3)"
-		counter=$((counter+1))
-	done
+	if [ "$doConffiles" = 'y' ]; then
+		conffileList=()
+		counter=0
+		while [ "$counter" -lt "${#conffileRawList[@]}" ]; do
+			# Cut off "Configuration file '" from the start and "'" plus a couple trailing characters from the end
+			conffileList[counter]="$(echo "${conffileRawList[$counter]}" | tail -c+21 | head -c-3)"
+			counter=$((counter+1))
+		done
 
-	echo "Lubuntu Update !!! CONFIGURATION FILE LIST START";
-	counter=0
-	while [ "$counter" -lt "${#conffileList[@]}" ]; do
-		echo "${conffileList[$counter]}"
-		counter=$((counter+1))
-	done
-	echo "Lubuntu Update !!! CONFIGURATION FILE LIST END";
+		echo "Lubuntu Update !!! CONFIGURATION FILE LIST START";
+		counter=0
+		while [ "$counter" -lt "${#conffileList[@]}" ]; do
+			echo "${conffileList[$counter]}"
+			counter=$((counter+1))
+		done
+		echo "Lubuntu Update !!! CONFIGURATION FILE LIST END";
 
-	# If we make it this far, there were conffiles to deal with
-	breakLoop='no'
-	gotCommand='no'
-	commandName=''
-	while [ "$breakLoop" = 'no' ]; do
-		read -r inputVal
-		if [ "$gotCommand" = 'no' ]; then
-			if [ "$inputVal" = 'done' ]; then
-				breakLoop='yes'
+		# If we make it this far, there were conffiles to deal with
+		breakLoop='no'
+		gotCommand='no'
+		commandName=''
+		while [ "$breakLoop" = 'no' ]; do
+			read -r inputVal
+			if [ "$gotCommand" = 'no' ]; then
+				if [ "$inputVal" = 'done' ]; then
+					breakLoop='yes'
+				else
+					commandName="$inputVal"
+					gotCommand='yes'
+				fi
 			else
-				commandName="$inputVal"
-				gotCommand='yes'
+				if [ "$commandName" = 'replace' ]; then # Replace an existing file
+					counter=0
+					while [ "$counter" -lt "${#conffileList[@]}" ]; do
+						if [ "$inputVal" = "${conffileList[$counter]}" ]; then
+							mv "$inputVal.dpkg-dist" "$inputVal"
+							break
+						fi
+						counter=$((counter+1))
+					done
+				elif [ "$commandName" = 'keep' ]; then # Keep an existing file
+					counter=0
+					while [ "$counter" -lt "${#conffileList[@]}" ]; do
+						if [ "$inputVal" = "${conffileList[$counter]}" ]; then
+							rm "$inputVal.dpkg-dist"
+							break
+						fi
+						counter=$((counter+1))
+					done
+				fi
+				gotCommand='no'
 			fi
+		done
+	fi
+
+	echo 'Checking release status...'
+
+	releaseCode="$(cat /etc/lsb-release | grep "DISTRIB_RELEASE" | cut -d'=' -f2)";
+	releaseYear="$(cut -d'.' -f1 <<< "$releaseCode")";
+	releaseMonth="$(cut -d'.' -f2 <<< "$releaseCode")";
+	metaReleaseData="$(curl https://changelogs.ubuntu.com/meta-release)";
+	#nextReleaseMonth='';
+	#nextReleaseYear='';
+	#nextLTSReleaseMonth='';
+	#nextLTSReleaseYear='';
+
+	while true; do
+		if ((releaseMonth == 4)); then
+			releaseMonth='10';
 		else
-			if [ "$commandName" = 'replace' ]; then # Replace an existing file
-				counter=0
-				while [ "$counter" -lt "${#conffileList[@]}" ]; do
-					if [ "$inputVal" = "${conffileList[$counter]}" ]; then
-						mv "$inputVal.dpkg-dist" "$inputVal"
-						break
-					fi
-					counter=$((counter+1))
-				done
-			elif [ "$commandName" = 'keep' ]; then # Keep an existing file
-				counter=0
-				while [ "$counter" -lt "${#conffileList[@]}" ]; do
-					if [ "$inputVal" = "${conffileList[$counter]}" ]; then
-						rm "$inputVal.dpkg-dist"
-						break
-					fi
-					counter=$((counter+1))
-				done
-			fi
-			gotCommand='no'
+			releaseMonth='04';
+			((releaseYear++));
+		fi
+		releaseSupportedResult="$(isReleaseSupported "$releaseYear" "$releaseMonth" "$metaReleaseData"; echo "$?")";
+		if [ "$releaseSupportedResult" = '0' ]; then
+			echo 'Lubuntu Update !!! NEW RELEASE';
+			echo "$releaseYear.$releaseMonth";
+		elif [ "$releaseSupportedResult" = '2' ]; then
+			break;
 		fi
 	done
 
+#	if ((releaseMonth == 4)); then
+#		nextReleaseMonth=$((releaseMonth + 6));
+#		nextReleaseYear="$releaseYear";
+#		if (((releaseYear % 2) == 0)); then
+#			nextLTSReleaseMonth='04';
+#			nextLTSReleaseYear=$((releaseYear + 2));
+#		fi
+#	else
+#		nextReleaseMonth="$releaseMonth";
+#		nextReleaseYear=$((releaseYear + 1));
+#	fi
+#
+#	if [ -n "$nextLTSReleaseYear" ]; then
+#		if isReleaseSupported "$nextLTSReleaseYear" "$nextLTSReleaseMonth" "$metaReleaseData"; then
+#			echo 'Lubuntu Update !!! NEW RELEASE';
+#			echo "$nextLTSReleaseYear.$nextLTSReleaseMonth";
+#		fi
+#	fi
+#
+#	if ! (((nextReleaseYear == nextLTSReleaseYear) && (nextReleaseMonth == nextLTSReleaseMonth))); then
+#		if isReleaseSupported "$nextReleaseYear" "$nextReleaseMonth" "$metaReleaseData"; then
+#			echo 'Lubuntu Update !!! NEW RELEASE';
+#			echo "$nextReleaseYear.$nextReleaseMonth";
+#		else
+#			echo "Unsupported release: $nextReleaseYear.$nextReleaseMonth";
+#		fi
+#	fi
+
 	echo 'Update installation complete.'
+elif [ "$1" = 'doReleaseUpgrade' ]; then
+	do-release-upgrade -m desktop -f DistUpgradeViewKDE;
+elif [ "$1" = 'declineReleaseUpgrade' ]; then
+	sed -i -E 's/^Prompt=(never|lts|normal)$/Prompt=never/' /etc/update-manager/release-upgrades;
 fi

src/main.cpp

@@ -1,14 +1,38 @@
-#include "ipcfilewatcher.h"
+#include "windowshowwatcher.h"
 #include "orchestrator.h"
 #include "mainwindow.h"
 #include "conffilehandlerdialog.h"
 
 #include <QApplication>
+#include <QDBusConnection>
+#include <QDBusError>
+#include <QDBusInterface>
+#include <QDebug>
 #include <QDialog>
 #include <QLocale>
 #include <QProcess>
+#include <QThread>
 #include <QTranslator>
 
+/*
+ * Detects if at least `count` processes that match `procName` are running.
+ */
+bool detectProc(QString procName, int count)
+{
+    QProcess procDetector;
+    procDetector.setProgram("/usr/bin/bash");
+    procDetector.setArguments(QStringList() << "-c" << "ps axo comm | grep " + procName);
+    procDetector.start();
+    procDetector.waitForFinished();
+    QString procDetectResult = procDetector.readAllStandardOutput();
+    procDetectResult = procDetectResult.trimmed();
+    QStringList procDetectResultList = procDetectResult.split('\n');
+    if (procDetectResultList.count() >= count) {
+        return true;
+    }
+    return false;
+}
+
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
@@ -23,40 +47,53 @@ int main(int argc, char *argv[])
         }
     }
 
-    /*
-     * If Lubuntu Update is already running, create
-     * /dev/shm/lubuntu-update/lubuntu-update-show-win and exit. This will
-     * trigger the existing process to pop up a window.
-     */
+    // Connect to D-Bus.
+    auto dbusConnection = QDBusConnection::sessionBus();
 
-    QProcess procDetector;
-    procDetector.setProgram("/usr/bin/bash");
-    procDetector.setArguments(QStringList() << "-c" << "ps axo comm | grep lubuntu-update");
-    procDetector.start();
-    procDetector.waitForFinished();
-    QString procDetectResult = procDetector.readAllStandardOutput();
-    procDetectResult = procDetectResult.trimmed();
-    QStringList procDetectResultList = procDetectResult.split('\n');
-    if (procDetectResultList.count() > 1) {
-        QFile flagFile("/dev/shm/lubuntu-update/lubuntu-update-show-win");
-        flagFile.open(QFile::WriteOnly);
-        flagFile.close();
+    /*
+     * If Lubuntu Update is already running, instruct the running instance to
+     * display its window via the D-Bus connection.
+     */
+    if (detectProc("lubuntu-update", 2)) {
+        auto iface = new QDBusInterface("me.lubuntu.LubuntuUpdate.window", "/", "me.lubuntu.LubuntuUpdate.window", dbusConnection);
+        if (!iface->isValid()) {
+            qWarning().noquote() << dbusConnection.lastError().message();
+            return 1;
+        }
+        iface->call("showWindow");
         return 0;
     }
 
+    /*
+     * Wait to run until lxqt-notificationd is running. This avoids a bug that
+     * causes notifications to show up in the entirely wrong spot. If it takes
+     * longer than about 30 seconds to show up, we continue on without it for
+     * the sake of getting security updates.
+     */
+    for (int i = 0;i < 30;i++) {
+        // "lxqt-notificati" is intentionally truncated here since that's how it shows up in the output of `ps axo comm`.
+        if (detectProc("lxqt-notificati", 1)) {
+            // Wait for it to initialize fully - 3 seconds should be way more than enough
+            QThread::sleep(3);
+            break;
+        } else {
+            QThread::sleep(1);
+        }
+    }
+
     // Don't want the updater to stop just because the user closed it :P
     a.setQuitOnLastWindowClosed(false);
 
     /*
-     * IPCFileWatcher just watches the /dev/shm/lubuntu-update folder for the
-     * creation of a lubuntu-update-show-win file. If it detects it, it
-     * immediately deletes it and emits a signal. This is then used later to
-     * cause the updater window to pop up.
+     * WindowShowWatcher is a very simple D-Bus service that allow triggering
+     * the Lubuntu Update window to be shown. If anything calls "showWindow"
+     * on this service, Lubuntu Update's window will pop up.
      */
+    QObject obj;
+    auto *wsw = new WindowShowWatcher(&obj);
+    dbusConnection.registerObject("/", &obj);
 
-    IPCFileWatcher *p = new IPCFileWatcher();
-
-    if (p->didInitFail()) {
+    if (!dbusConnection.registerService("me.lubuntu.LubuntuUpdate.window")) {
         return 1;
     }
 
@@ -71,10 +108,9 @@ int main(int argc, char *argv[])
      * there's no need to do anything with this except create it and then
      * start the event loop.
      */
-
     Orchestrator *o = new Orchestrator();
 
-    QObject::connect(p, &IPCFileWatcher::showWindowFlagDetected, o, &Orchestrator::displayUpdater);
+    QObject::connect(wsw, &WindowShowWatcher::showWindowTriggered, o, &Orchestrator::displayUpdater);
 
     /*
      * This is an artifact from testing the conffile handler window. You can

src/mainwindow.cpp

@@ -25,6 +25,7 @@ MainWindow::MainWindow(QWidget *parent)
     connect(aptManager, &AptManager::progressUpdated, this, &MainWindow::onProgressUpdate);
     connect(aptManager, &AptManager::logLineReady, this, &MainWindow::onLogLineReady);
     connect(aptManager, &AptManager::conffileListReady, this, &MainWindow::onConffileListReady);
+    connect(aptManager, &AptManager::newRelease, this, &MainWindow::onNewRelease);
 }
 
 MainWindow::~MainWindow()
@@ -143,6 +144,9 @@ void MainWindow::onUpdateCompleted()
     ui->progressBar->setVisible(false);
     ui->statLabel->setText(tr("Update installation complete."));
     emit updatesInstalled(); // this tells the orchestrator to hide the tray icon
+    if (releaseCodes.count() > 0) {
+        handleNewReleases();
+    }
 }
 
 void MainWindow::onCheckUpdatesCompleted()
@@ -175,3 +179,14 @@ void MainWindow::onConffileListReady(QStringList conffileList)
     }
     aptManager->doneWithConffiles();
 }
+
+void MainWindow::onNewRelease(QString code)
+{
+    releaseCodes.append(code);
+}
+
+void MainWindow::handleNewReleases()
+{
+    emit newReleaseAvailable(releaseCodes);
+    releaseCodes.clear();
+}

src/mainwindow.h

@@ -26,6 +26,7 @@ public:
 signals:
     void updatesInstalled();
     void updatesRefreshed();
+    void newReleaseAvailable(QStringList releaseCodes);
 
 protected slots:
     void closeEvent(QCloseEvent *event) override;
@@ -39,9 +40,13 @@ private slots:
     void onProgressUpdate(int progress);
     void onLogLineReady(QString logLine);
     void onConffileListReady(QStringList conffileList);
+    void onNewRelease(QString code);
 
 private:
     Ui::MainWindow *ui;
     AptManager *aptManager;
+    QStringList releaseCodes;
+
+    void handleNewReleases();
 };
 #endif // MAINWINDOW_H

src/mainwindow.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>462</width>
+    <width>473</width>
     <height>600</height>
    </rect>
   </property>
@@ -37,6 +37,9 @@
     </item>
     <item>
      <widget class="QProgressBar" name="progressBar">
+      <property name="maximum">
+       <number>100</number>
+      </property>
       <property name="value">
        <number>0</number>
       </property>

src/orchestrator.cpp

@@ -1,8 +1,13 @@
 #include "orchestrator.h"
 #include "mainwindow.h"
 #include "aptmanager.h"
+#include "releaseupgradewindow.h"
 
+#include <QDebug>
+#include <QDir>
+#include <QFile>
 #include <QIcon>
+#include <QProcess>
 #include <QSystemTrayIcon>
 #include <QTimer>
 
@@ -12,10 +17,38 @@ Orchestrator::Orchestrator(QObject *parent)
     checkTimer = new QTimer(); // every time this triggers, the apt database is checked for new updates
     trayIcon = new QSystemTrayIcon(); // this is shown to the user to offer updates
 
+    /*
+     * Parse the Lubuntu Update config file. It contains two critical pieces
+     * of info - when the system last offered the user a release upgrade,
+     * and whether the user has disabled release upgrade notifications.
+     */
+    QFile configFile(QDir::homePath() + "/.config/lubuntu-update.conf");
+    bool success = configFile.open(QFile::ReadOnly);
+    if (success) {
+        char lineBuf[2048];
+        while (!configFile.atEnd()) {
+            configFile.readLine(lineBuf, 2048);
+            QString line(lineBuf);
+            line = line.trimmed();
+            QStringList lineParts = line.split("=");
+            if (lineParts.count() == 2) {
+                if (lineParts[0] == "nextDoReleaseUpgradeNotify") {
+                    nextUpgradeCheck = QDateTime::fromSecsSinceEpoch(lineParts[1].toLongLong());
+                } else {
+                    qWarning() << "Unrecognized config line: " << line;
+                }
+            } else {
+                qWarning() << "Wrong number of fields in line: " << line;
+            }
+        }
+    }
+    configFile.close();
+
     connect(checkTimer, &QTimer::timeout, this, &Orchestrator::checkForUpdates);
     connect(trayIcon, &QSystemTrayIcon::activated, this, &Orchestrator::displayUpdater);
     connect(&updaterWindow, &MainWindow::updatesInstalled, this, &Orchestrator::handleUpdatesInstalled);
     connect(&updaterWindow, &MainWindow::updatesRefreshed, this, &Orchestrator::handleUpdatesRefreshed);
+    connect(&updaterWindow, &MainWindow::newReleaseAvailable, this, &Orchestrator::onNewReleaseAvailable);
 
     checkTimer->start(21600000); // check four times a day, at least one of those times unattended-upgrades should have refreshed the apt database
 
@@ -65,3 +98,91 @@ void Orchestrator::handleUpdatesRefreshed()
     checkForUpdates();
     displayUpdater();
 }
+
+void Orchestrator::onNewReleaseAvailable(QStringList releaseCodes)
+{
+    // First, determine what kinds of releases the user wants to see.
+    QFile druTypeFile("/etc/update-manager/release-upgrades");
+    bool success = druTypeFile.open(QFile::ReadOnly);
+    QString druType;
+    if (success) {
+        char lineBuf[2048];
+        while (!druTypeFile.atEnd()) {
+            druTypeFile.readLine(lineBuf, 2048);
+            QString line(lineBuf);
+            line = line.trimmed();
+            if (line == "Prompt=lts") {
+                druType="lts";
+                druTypeFile.close();
+                break;
+            } else if (line == "Prompt=none") {
+                // The user has disabled all upgrade prompts.
+                druTypeFile.close();
+                return;
+            } else if (line == "Prompt=normal") {
+                druType="normal";
+                druTypeFile.close();
+                break;
+            }
+        }
+    } else {
+        druType="normal";
+        druTypeFile.close();
+    }
+
+    for (int i = 0;i < releaseCodes.count();i++) {
+        QStringList releaseCodeParts = releaseCodes[i].split('.');
+        if (releaseCodeParts.count() >= 2) {
+            int releaseYear = releaseCodeParts[0].toInt();
+            int releaseMonth = releaseCodeParts[1].toInt();
+            if (((releaseYear % 2 == 0) && (releaseMonth == 4)) || druType == "normal") {
+                QDateTime now = QDateTime::currentDateTime();
+                if (nextUpgradeCheck < now) {
+                    ReleaseUpgradeWindow upgradeWindow(releaseCodes[i]);
+                    upgradeWindow.exec();
+                    if (upgradeWindow.getUpgradeAccepted()) {
+                        doReleaseUpgrade();
+                    } else if (upgradeWindow.getUpgradeDelayStamp() > 0) {
+                        delayReleaseUpgrade(upgradeWindow.getUpgradeDelayStamp());
+                    } else {
+                        declineReleaseUpgrade();
+                    }
+                    break;
+                }
+            }
+        }
+    }
+}
+
+void Orchestrator::doReleaseUpgrade()
+{
+    QProcess druProcess;
+    druProcess.setProgram("/usr/bin/lxqt-sudo");
+    druProcess.setArguments(QStringList() << "/usr/libexec/lubuntu-update-backend" << "doReleaseUpgrade");
+    druProcess.start();
+    druProcess.waitForFinished(-1);
+}
+
+void Orchestrator::delayReleaseUpgrade(qint64 timestamp)
+{
+    QFile configFile(QDir::homePath() + "/.config/lubuntu-update.conf");
+    bool success = configFile.open(QFile::WriteOnly);
+    if (success) {
+        configFile.write("nextDoReleaseUpgradeNotify=");
+        configFile.write(QString::number(timestamp).toUtf8());
+        configFile.write("\n");
+    } else {
+        qWarning() << "Could not write to " + QDir::homePath() + "/.config/lubuntu-update.conf, check permissions";
+    }
+    configFile.close();
+    nextUpgradeCheck = QDateTime::fromSecsSinceEpoch(timestamp);
+}
+
+void Orchestrator::declineReleaseUpgrade()
+{
+    QProcess druProcess;
+    druProcess.setProgram("/usr/bin/lxqt-sudo");
+    druProcess.setArguments(QStringList() << "/usr/libexec/lubuntu-update-backend" << "declineReleaseUpgrade");
+    druProcess.start();
+    druProcess.waitForFinished(-1);
+}

src/orchestrator.h

@@ -3,11 +3,13 @@
 
 #include "mainwindow.h"
 
+#include <QDateTime>
 #include <QObject>
 #include <QStringList>
 
 class QTimer;
 class QSystemTrayIcon;
+class ReleaseUpgradeWindow;
 
 class Orchestrator : public QObject
 {
@@ -22,12 +24,17 @@ private slots:
     void checkForUpdates();
     void handleUpdatesInstalled();
     void handleUpdatesRefreshed();
+    void onNewReleaseAvailable(QStringList releaseCodes);
 
 private:
     QTimer *checkTimer;
     QSystemTrayIcon *trayIcon;
     QList<QStringList> updateInfo;
     MainWindow updaterWindow;
+    QDateTime nextUpgradeCheck;
+    void doReleaseUpgrade();
+    void delayReleaseUpgrade(qint64 timestamp);
+    void declineReleaseUpgrade();
 };
 
 #endif // ORCHESTRATOR_H

src/releaseupgradewindow.cpp

@@ -0,0 +1,67 @@
+#include "releaseupgradewindow.h"
+#include "ui_releaseupgradewindow.h"
+
+#include "upgradedelaywindow.h"
+
+#include <QDateTime>
+#include <QMessageBox>
+
+ReleaseUpgradeWindow::ReleaseUpgradeWindow(QString releaseCode, QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::ReleaseUpgradeWindow)
+{
+    ui->setupUi(this);
+    ui->upgradeLabel->setText(tr("An upgrade to Lubuntu %1 is available! Would you like to install this upgrade now?").arg(releaseCode));
+    code=releaseCode;
+    connect(ui->upgradeButton, &QPushButton::clicked, this, &ReleaseUpgradeWindow::onUpgradeClicked);
+    connect(ui->remindButton, &QPushButton::clicked, this, &ReleaseUpgradeWindow::onRemindClicked);
+    connect(ui->declineButton, &QPushButton::clicked, this, &ReleaseUpgradeWindow::onDeclineClicked);
+}
+
+ReleaseUpgradeWindow::~ReleaseUpgradeWindow()
+{
+    delete ui;
+}
+
+bool ReleaseUpgradeWindow::getUpgradeAccepted()
+{
+    return upgradeAccepted;
+}
+
+qint64 ReleaseUpgradeWindow::getUpgradeDelayStamp()
+{
+    return upgradeDelayStamp;
+}
+
+void ReleaseUpgradeWindow::onUpgradeClicked()
+{
+    upgradeAccepted = true;
+    this->done(0);
+}
+
+void ReleaseUpgradeWindow::onRemindClicked()
+{
+    UpgradeDelayWindow delayWindow;
+    delayWindow.exec();
+    if (delayWindow.getDelayDays() > 0) {
+        QDateTime delayDateTime = QDateTime::currentDateTime();
+        delayDateTime = delayDateTime.addDays(delayWindow.getDelayDays());
+        upgradeAccepted = false;
+        upgradeDelayStamp = delayDateTime.toSecsSinceEpoch();
+        this->done(0);
+    }
+}
+
+void ReleaseUpgradeWindow::onDeclineClicked()
+{
+    QMessageBox confirmDialog;
+    confirmDialog.setWindowTitle(tr("Lubuntu Update"));
+    confirmDialog.setText(tr("You have declined the upgrade to Lubuntu %1.\nYou can upgrade manually by following the directions at https://manual.lubuntu.me/stable/D/upgrading.html.").arg(code));
+    confirmDialog.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);
+    int result = confirmDialog.exec();
+    if (result == QMessageBox::Ok) {
+        upgradeDelayStamp = 0;
+        upgradeAccepted = false;
+        this->done(0);
+    }
+}

src/releaseupgradewindow.h

@@ -0,0 +1,32 @@
+#ifndef RELEASEUPGRADEWINDOW_H
+#define RELEASEUPGRADEWINDOW_H
+
+#include <QDialog>
+
+namespace Ui {
+class ReleaseUpgradeWindow;
+}
+
+class ReleaseUpgradeWindow : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit ReleaseUpgradeWindow(QString releaseCode, QWidget *parent = nullptr);
+    ~ReleaseUpgradeWindow();
+    bool getUpgradeAccepted();
+    qint64 getUpgradeDelayStamp();
+
+private slots:
+    void onUpgradeClicked();
+    void onRemindClicked();
+    void onDeclineClicked();
+
+private:
+    Ui::ReleaseUpgradeWindow *ui;
+    QString code;
+    bool upgradeAccepted = false;
+    qint64 upgradeDelayStamp = 0;
+};
+
+#endif // RELEASEUPGRADEWINDOW_H

src/releaseupgradewindow.ui

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ReleaseUpgradeWindow</class>
+ <widget class="QDialog" name="ReleaseUpgradeWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>393</width>
+    <height>116</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Lubuntu Update</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="upgradeLabel">
+     <property name="text">
+      <string>upgrade available</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>6</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QPushButton" name="upgradeButton">
+       <property name="text">
+        <string>Upgrade Now</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="remindButton">
+       <property name="text">
+        <string>Remind me later</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="declineButton">
+       <property name="text">
+        <string>Decline Upgrade</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

src/upgradedelaywindow.cpp

@@ -0,0 +1,42 @@
+#include "upgradedelaywindow.h"
+#include "ui_upgradedelaywindow.h"
+
+UpgradeDelayWindow::UpgradeDelayWindow(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::UpgradeDelayWindow)
+{
+    ui->setupUi(this);
+    connect(ui->okButton, &QPushButton::clicked, this, &UpgradeDelayWindow::onOkClicked);
+    connect(ui->cancelButton, &QPushButton::clicked, this, &UpgradeDelayWindow::onCancelClicked);
+}
+
+UpgradeDelayWindow::~UpgradeDelayWindow()
+{
+    delete ui;
+}
+
+qint64 UpgradeDelayWindow::getDelayDays()
+{
+    return delayDays;
+}
+
+void UpgradeDelayWindow::onOkClicked()
+{
+    switch (ui->timeTypeComboBox->currentIndex()) {
+    case 0: // days
+        delayDays = ui->timeSpinBox->value();
+        break;
+    case 1: // weeks
+        delayDays = ui->timeSpinBox->value() * 7;
+        break;
+    case 2: // months
+        delayDays = ui->timeSpinBox->value() * 28;
+        break;
+    }
+    this->done(0);
+}
+
+void UpgradeDelayWindow::onCancelClicked()
+{
+    this->done(0);
+}

src/upgradedelaywindow.h

@@ -0,0 +1,28 @@
+#ifndef UPGRADEDELAYWINDOW_H
+#define UPGRADEDELAYWINDOW_H
+
+#include <QDialog>
+
+namespace Ui {
+class UpgradeDelayWindow;
+}
+
+class UpgradeDelayWindow : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit UpgradeDelayWindow(QWidget *parent = nullptr);
+    ~UpgradeDelayWindow();
+    qint64 getDelayDays();
+
+private slots:
+    void onOkClicked();
+    void onCancelClicked();
+
+private:
+    Ui::UpgradeDelayWindow *ui;
+    qint64 delayDays;
+};
+
+#endif // UPGRADEDELAYWINDOW_H

src/upgradedelaywindow.ui

@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>UpgradeDelayWindow</class>
+ <widget class="QDialog" name="UpgradeDelayWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>242</width>
+    <height>137</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Lubuntu Update</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;How long would you like to wait before being reminded of the upgrade again?&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+   <item>
+    <layout class="QGridLayout" name="gridLayout">
+     <item row="0" column="1">
+      <widget class="QSpinBox" name="timeSpinBox"/>
+     </item>
+     <item row="1" column="2">
+      <widget class="QPushButton" name="okButton">
+       <property name="text">
+        <string>OK</string>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+      <widget class="QPushButton" name="cancelButton">
+       <property name="text">
+        <string>Cancel</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="2">
+      <widget class="QComboBox" name="timeTypeComboBox">
+       <item>
+        <property name="text">
+         <string>Days</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Weeks</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Months</string>
+        </property>
+       </item>
+      </widget>
+     </item>
+     <item row="1" column="0">
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

src/windowshowwatcher.cpp

@@ -0,0 +1,6 @@
+#include "windowshowwatcher.h"
+
+void WindowShowWatcher::showWindow()
+{
+    emit showWindowTriggered();
+}

src/windowshowwatcher.h

@@ -0,0 +1,23 @@
+#ifndef WINDOWSHOWWATCHER_H
+#define WINDOWSHOWWATCHER_H
+
+#include <QObject>
+#include <QDBusAbstractAdaptor>
+#include <QDBusVariant>
+
+class WindowShowWatcher : public QDBusAbstractAdaptor
+{
+    Q_OBJECT
+    Q_CLASSINFO("D-Bus Interface", "me.lubuntu.LubuntuUpdate.window")
+
+public:
+    explicit WindowShowWatcher(QObject *obj) : QDBusAbstractAdaptor(obj) {}
+
+public slots:
+    void showWindow();
+
+signals:
+    void showWindowTriggered();
+};
+
+#endif // WINDOWSHOWWATCHER_H