Unmounting busy device doesn't tell who is blocking

Summary: Unmounting a busy device from the places panel doesn't tell which applications have open files blocking the unmount.

Test Plan:
Mount a USB stick using Dolphin
Open a file from the USB stick
Unmount the USB stick using Dolphin
Observe the new error message.

FEATURE: 189302

Reviewers: #dolphin, elvisangelaccio, ngraham, broulik, meven

Reviewed By: #dolphin, elvisangelaccio, meven

Subscribers: meven, davidedmundson, kfm-devel

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D19989

3 files changed, 27 insertions, 2 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 90c1df10e..88ccca256 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ set (KDE_APPLICATIONS_VERSION "${KDE_APPLICATIONS_VERSION_MAJOR}.${KDE_APPLICATI
 project(Dolphin VERSION ${KDE_APPLICATIONS_VERSION})
 
 set(QT_MIN_VERSION "5.11.0")
-set(KF5_MIN_VERSION "5.61.0")
+set(KF5_MIN_VERSION "5.63.0")
 
 # ECM setup
 find_package(ECM ${KF5_MIN_VERSION} CONFIG REQUIRED)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8bbb081cd..14701a1f4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -274,6 +274,7 @@ add_library(dolphinstatic STATIC ${dolphinstatic_SRCS})
 target_include_directories(dolphinstatic SYSTEM PRIVATE ${PHONON_INCLUDES})
 target_link_libraries(dolphinstatic
     dolphinprivate
+    KF5::CoreAddons
     KF5::KCMUtils
     KF5::DBusAddons
     KF5::Notifications
diff --git a/src/panels/places/placesitemmodel.cpp b/src/panels/places/placesitemmodel.cpp
index e8636942b..c0cef9315 100644
--- a/src/panels/places/placesitemmodel.cpp
+++ b/src/panels/places/placesitemmodel.cpp
@@ -36,6 +36,8 @@
 #include <KUrlMimeData>
 #include <Solid/DeviceNotifier>
 #include <Solid/OpticalDrive>
+#include <KCoreAddons/KProcessList>
+#include <KCoreAddons/KListOpenFilesJob>
 
 #include <QAction>
 #include <QIcon>
@@ -474,7 +476,29 @@ void PlacesItemModel::updateItem(PlacesItem *item, const QModelIndex &index)
 void PlacesItemModel::slotStorageTearDownDone(Solid::ErrorType error, const QVariant& errorData)
 {
     if (error && errorData.isValid()) {
-        emit errorMessage(errorData.toString());
+        if (error == Solid::ErrorType::DeviceBusy) {
+            KListOpenFilesJob* listOpenFilesJob = new KListOpenFilesJob(m_deviceToTearDown->filePath());
+            connect(listOpenFilesJob, &KIO::Job::result, this, [this, listOpenFilesJob](KJob*) {
+                const KProcessList::KProcessInfoList blockingProcesses = listOpenFilesJob->processInfoList();
+                QString errorString;
+                if (blockingProcesses.isEmpty()) {
+                    errorString = i18n("One or more files on this device are open within an application.");
+                } else {
+                    QStringList blockingApps;
+                    for (const auto& process : blockingProcesses) {
+                        blockingApps << process.name();
+                    }
+                    blockingApps.removeDuplicates();
+                    errorString = xi18np("One or more files on this device are opened in application <application>\"%2\"</application>.",
+                            "One or more files on this device are opened in following applications: <application>%2</application>.",
+                            blockingApps.count(), blockingApps.join(i18nc("separator in list of apps blocking device unmount", ", ")));
+                }
+                emit errorMessage(errorString);
+            });
+            listOpenFilesJob->start();
+        } else {
+            emit errorMessage(errorData.toString());
+        }
     }
     disconnect(m_deviceToTearDown, &Solid::StorageAccess::teardownDone,
                this, &PlacesItemModel::slotStorageTearDownDone);