applaunchd: Initial commit

`applaunchd` is a new service, dedicated to starting and monitoring
applications. It is part of the Application Framework rework.

Bug-AGL: SPEC-4160
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
Change-Id: I9543957f9065670e9112556f5cd2b31d0b2ab9d9

19 files changed, 1800 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..31c692a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,54 @@
+Apache License
+
+Version 2.0, January 2004
+
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
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+END OF TERMS AND CONDITIONS
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..943679c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,27 @@
+AGL Application Launcher service reference implementation
+
+`applaunchd` is a simple service for launching applications from other
+applications. It exposes an interface named 'org.automotivelinux.AppLaunch' on
+on the D-Bus session bus and can be autostarted by using this interface name.
+
+This interface can be used to:
+- retrieve a list of available applications
+- request that a specific application be started by using the 'start' method
+- subcribe to the 'started' and/or 'terminated' signals in order to be
+  notified when an application started successfully or terminated
+
+For more details about the D-Bus interface, please refer to the file
+`data/org.automotivelinux.AppLaunch.xml`.
+
+Applications can be started either through D-Bus activation (using their D-Bus
+name) or by specifying a command line to be executed, and are monitored until
+they exit. Please note `applaunchd` allows only one instance of a given
+application.
+
+AGL repo for source code:
+https://gerrit.automotivelinux.org/gerrit/#/admin/projects/src/applaunchd
+
+You can also clone the source repository by running the following command:
+```
+$ git clone https://gerrit.automotivelinux.org/gerrit/src/applaunchd
+```
diff --git a/data/meson.build b/data/meson.build
new file mode 100644
index 0000000..34aefa4
--- /dev/null
+++ b/data/meson.build
@@ -0,0 +1,57 @@
+#
+# Copyright (C) 2021 Collabora Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+gnome = import('gnome')
+
+# DBus server interface
+dbus_prefix = 'org.automotivelinux.'
+dbus_namespace = 'applaunchd'
+
+generated_dbus_sources = []
+
+dbus_interfaces = [ 'org.automotivelinux.AppLaunch.xml' ]
+
+generated_dbus_sources += gnome.gdbus_codegen('applaunch-dbus',
+    sources          : dbus_interfaces,
+    object_manager   : false,
+    interface_prefix : 'org.automotivelinux.',
+    install_header   : false,
+    namespace        : 'applaunchd')
+
+dbus_header_dir = meson.current_build_dir()
+dbus_inc = include_directories('.')
+install_data(dbus_interfaces, install_dir: ifacedir)
+
+# Application DBus interface
+generated_dbus_sources += gnome.gdbus_codegen('fdo-dbus',
+    sources          : [ 'org.freedesktop.Application.xml' ],
+    object_manager   : false,
+    interface_prefix : 'org.freedesktop.',
+    install_header   : false,
+    namespace        : 'fdo')
+
+# systemd service file
+service_data = configuration_data()
+service_data.set('bindir', bindir)
+service_file = 'org.automotivelinux.AppLaunch.service'
+
+configure_file(
+  input : service_file + '.in',
+  output : service_file,
+  configuration : service_data,
+  install : true,
+  install_dir: servicedir,
+)
diff --git a/data/org.automotivelinux.AppLaunch.service.in b/data/org.automotivelinux.AppLaunch.service.in
new file mode 100644
index 0000000..41acad5
--- /dev/null
+++ b/data/org.automotivelinux.AppLaunch.service.in
@@ -0,0 +1,3 @@
+[D-BUS Service]
+Name=org.automotivelinux.AppLaunch
+Exec=@bindir@/applaunchd
diff --git a/data/org.automotivelinux.AppLaunch.xml b/data/org.automotivelinux.AppLaunch.xml
new file mode 100644
index 0000000..52aa20b
--- /dev/null
+++ b/data/org.automotivelinux.AppLaunch.xml
@@ -0,0 +1,74 @@
+<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+
+<!--
+ AppLaunch Interface Specification
+
+   Copyright (C) 2021 Collabora Ltd
+-->
+<node name="/org/automotivelinux/AppLaunch" xmlns:doc="http://www.freedesktop.org/dbus/1.0/doc.dtd">
+
+  <!--
+      org.automotivelinux.AppLaunch:
+      @short_description: The AppLaunch interface.
+
+      The AppLaunch interface allows requesting application startup and
+      being notified of application startup and termination events.
+  -->
+  <interface name="org.automotivelinux.AppLaunch">
+
+    <!--
+        start:
+        @appid: Application ID, should match:
+                - the xdg-shell app-id for graphical applications started
+                  through a command line
+                - the D-Bus name owned by the application for D-Bus activated
+                  apps
+
+        Start the application with the corresponding application ID.
+    -->
+    <method name="start">
+      <arg name="appid" type="s" direction="in"/>
+    </method>
+
+    <!--
+        listApplications:
+        @graphical: Whether the should should be limited to graphical
+                    applications.
+        @applist: The application list as an array of variants. Each array item
+                  is an application entry, represented as a structure of 3 strings:
+                  - application ID
+                  - application name
+                  - absolute icon path
+
+        Retrieve the list of applications which can be started using this interface.
+    -->
+    <method name="listApplications">
+      <arg name="graphical" type="b" direction="in"/>
+      <arg name="applist" type="av" direction="out"/>
+    </method>
+
+    <!--
+        started:
+        @appid: Application ID
+
+        Emitted when an application started successfully, which happens when:
+        - the D-Bus name has been taken for D-Bus activated applications
+        - the process was created for other applications
+    -->
+    <signal name="started">
+      <arg name="appid" type="s"/>
+    </signal>
+
+    <!--
+        terminated:
+        @appid: Application ID
+
+        Emitted when an application terminated, which happens when:
+        - the D-Bus name has been released for D-Bus activated applications
+        - the process exited for other applications
+    -->
+    <signal name="terminated">
+      <arg name="appid" type="s"/>
+    </signal>
+  </interface>
+</node>
diff --git a/data/org.freedesktop.Application.xml b/data/org.freedesktop.Application.xml
new file mode 100644
index 0000000..dc03d70
--- /dev/null
+++ b/data/org.freedesktop.Application.xml
@@ -0,0 +1,17 @@
+<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+<node>
+  <interface name='org.freedesktop.Application'>
+    <method name='Activate'>
+      <arg type='a{sv}' name='platform_data' direction='in'/>
+    </method>
+    <method name='Open'>
+      <arg type='as' name='uris' direction='in'/>
+      <arg type='as' name='platform_data' direction='in'/>
+    </method>
+    <method name='ActivateAction'>
+      <arg type='s' name='action_name' direction='in'/>
+      <arg type='av' name='parameter' direction='in'/>
+      <arg type='as' name='platform_data' direction='in'/>
+    </method>
+  </interface>
+</node>
diff --git a/meson.build b/meson.build
new file mode 100644
index 0000000..8e820e5
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,65 @@
+#
+# Copyright (C) 2021 Collabora Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+project (
+  'applaunchd',
+  'c',
+  version : '0.1.0',
+  license : 'Apache-2.0',
+  meson_version : '>= 0.46.0',
+  default_options :
+    [
+      'warning_level=1',
+      'buildtype=debugoptimized',
+      'c_std=gnu11'
+    ],
+)
+
+cc = meson.get_compiler('c')
+
+app_name = meson.project_name()
+
+prefix = get_option('prefix')
+datadir = get_option('datadir')
+sysconfdir = get_option('sysconfdir')
+bindir = join_paths(prefix, get_option('bindir'))
+ifacedir = join_paths(prefix, join_paths(datadir, 'dbus-1', 'interfaces'))
+servicedir = join_paths(prefix, join_paths(datadir, 'dbus-1', 'services'))
+
+if datadir.startswith('/')
+  full_datadir = datadir
+else
+  full_datadir = join_paths(prefix, datadir)
+endif
+
+if sysconfdir.startswith('/')
+  full_sysconfdir = sysconfdir
+else
+  full_sysconfdir = join_paths(prefix, sysconfdir)
+endif
+
+config_data = configuration_data()
+config_data.set_quoted('APP_DATA_NAME', app_name)
+config_data.set_quoted('DATADIR', full_datadir)
+config_data.set_quoted('SYSCONFDIR', full_sysconfdir)
+
+config_h = configure_file (
+    output: 'config.h',
+    configuration: config_data
+)
+
+subdir('data')
+subdir('src')
diff --git a/src/app_info.c b/src/app_info.c
new file mode 100644
index 0000000..03e1f02
--- /dev/null
+++ b/src/app_info.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gio/gio.h>
+
+#include "app_info.h"
+#include "dbus_activation_manager.h"
+
+struct _AppInfo {
+    GObject parent_instance;
+
+    gchar *app_id;
+    gchar *name;
+    gchar *icon_path;
+    gchar *command;
+    gboolean dbus_activated;
+    gboolean graphical;
+
+    AppStatus status;
+
+    /*
+     * `runtime_data` is an opaque pointer depending on the app startup method.
+     * It is set in by ProcessManager or DBusActivationManager.
+     */
+    gpointer runtime_data;
+};
+
+G_DEFINE_TYPE(AppInfo, app_info, G_TYPE_OBJECT);
+
+/*
+ * Initialization & cleanup functions
+ */
+
+static void app_info_dispose(GObject *object)
+{
+    AppInfo *self = APPLAUNCHD_APP_INFO(object);
+
+    g_clear_pointer(&self->app_id, g_free);
+    g_clear_pointer(&self->name, g_free);
+    g_clear_pointer(&self->icon_path, g_free);
+    g_clear_pointer(&self->app_id, g_free);
+
+    if (self->dbus_activated) {
+        g_clear_pointer(&self->runtime_data,
+                        dbus_activation_manager_free_runtime_data);
+    } else {
+        g_clear_pointer(&self->runtime_data, g_free);
+    }
+
+    G_OBJECT_CLASS(app_info_parent_class)->dispose(object);
+}
+
+static void app_info_finalize(GObject *object)
+{
+    G_OBJECT_CLASS(app_info_parent_class)->finalize(object);
+}
+
+static void app_info_class_init(AppInfoClass *klass)
+{
+    GObjectClass *object_class = (GObjectClass *)klass;
+
+    object_class->dispose = app_info_dispose;
+    object_class->finalize = app_info_finalize;
+}
+
+static void app_info_init(AppInfo *self)
+{
+}
+
+/*
+ * Public functions
+ */
+
+AppInfo *app_info_new(const gchar *app_id, const gchar *name,
+                      const gchar *icon_path, const gchar *command,
+                      gboolean dbus_activated, gboolean graphical)
+{
+    AppInfo *self = g_object_new(APPLAUNCHD_TYPE_APP_INFO, NULL);
+
+    self->app_id = g_strdup(app_id);
+    self->name = g_strdup(name);
+    self->icon_path = g_strdup(icon_path);
+    self->command = g_strdup(command);
+    self->dbus_activated = dbus_activated;
+    self->graphical = graphical;
+
+    return self;
+}
+
+const gchar *app_info_get_app_id(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), NULL);
+
+    return self->app_id;
+}
+
+const gchar *app_info_get_name(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), NULL);
+
+    return self->name;
+}
+
+const gchar *app_info_get_icon_path(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), NULL);
+
+    return self->icon_path;
+}
+
+const gchar *app_info_get_command(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), NULL);
+
+    return self->command;
+}
+
+gboolean app_info_get_dbus_activated(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), FALSE);
+
+    return self->dbus_activated;
+}
+
+gboolean app_info_get_graphical(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), FALSE);
+
+    return self->graphical;
+}
+
+AppStatus app_info_get_status(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), APP_STATUS_INACTIVE);
+
+    return self->status;
+}
+
+gpointer app_info_get_runtime_data(AppInfo *self)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(self), NULL);
+
+    return self->runtime_data;
+}
+
+void app_info_set_runtime_data(AppInfo *self, gpointer runtime_data)
+{
+    g_return_if_fail(APPLAUNCHD_IS_APP_INFO(self));
+
+    self->runtime_data = runtime_data;
+}
+
+void app_info_set_status(AppInfo *self, AppStatus status)
+{
+    g_return_if_fail(APPLAUNCHD_IS_APP_INFO(self));
+
+    self->status = status;
+}
diff --git a/src/app_info.h b/src/app_info.h
new file mode 100644
index 0000000..dd312c4
--- /dev/null
+++ b/src/app_info.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef APPINFO_H
+#define APPINFO_H
+
+#include <glib-object.h>
+
+typedef enum {
+    APP_STATUS_INACTIVE,
+    APP_STATUS_STARTING,
+    APP_STATUS_RUNNING
+} AppStatus;
+
+G_BEGIN_DECLS
+
+#define APPLAUNCHD_TYPE_APP_INFO app_info_get_type()
+
+G_DECLARE_FINAL_TYPE(AppInfo, app_info, APPLAUNCHD,
+                     APP_INFO, GObject);
+
+AppInfo *app_info_new(const gchar *app_id, const gchar *name,
+                      const gchar *icon_path, const gchar *command,
+                      gboolean dbus_activated, gboolean graphical);
+
+/* Accessors for read-only members */
+const gchar *app_info_get_app_id(AppInfo *self);
+const gchar *app_info_get_name(AppInfo *self);
+const gchar *app_info_get_icon_path(AppInfo *self);
+const gchar *app_info_get_command(AppInfo *self);
+gboolean app_info_get_dbus_activated(AppInfo *self);
+gboolean app_info_get_graphical(AppInfo *self);
+
+/* Accessors for read-write members */
+AppStatus app_info_get_status(AppInfo *self);
+void app_info_set_status(AppInfo *self, AppStatus status);
+
+gpointer app_info_get_runtime_data(AppInfo *self);
+void app_info_set_runtime_data(AppInfo *self, gpointer runtime_data);
+
+G_END_DECLS
+
+#endif
diff --git a/src/app_launcher.c b/src/app_launcher.c
new file mode 100644
index 0000000..9bb95a4
--- /dev/null
+++ b/src/app_launcher.c
@@ -0,0 +1,423 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gio/gdesktopappinfo.h>
+
+#include "app_info.h"
+#include "app_launcher.h"
+#include "dbus_activation_manager.h"
+#include "process_manager.h"
+#include "utils.h"
+
+typedef struct _AppLauncher {
+    applaunchdAppLaunchSkeleton parent;
+
+    DBusActivationManager *dbus_manager;
+    ProcessManager *process_manager;
+
+    GList *apps_list;
+} AppLauncher;
+
+static void app_launcher_iface_init(applaunchdAppLaunchIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE(AppLauncher, app_launcher,
+                        APPLAUNCHD_TYPE_APP_LAUNCH_SKELETON,
+                        G_IMPLEMENT_INTERFACE(APPLAUNCHD_TYPE_APP_LAUNCH,
+                                              app_launcher_iface_init));
+
+/*
+ * Internal functions
+ */
+
+/*
+ * This function is executed during the object initialization. It goes through
+ * all available applications on the system and creates a static list
+ * containing all the relevant info (ID, name, command, icon...) for further
+ * processing.
+ */
+static void app_launcher_update_applications_list(AppLauncher *self)
+{
+    g_autoptr(GList) app_list = g_app_info_get_all();
+    g_auto(GStrv) dirlist = g_strsplit(getenv("XDG_DATA_DIRS"), ":", -1);
+    guint len = g_list_length(app_list);
+
+    for (guint i = 0; i < len; i++) {
+        GAppInfo *appinfo = g_list_nth_data(app_list, i);
+        const gchar *desktop_id = g_app_info_get_id(appinfo);
+        GIcon *icon = g_app_info_get_icon(appinfo);
+        g_autoptr(GDesktopAppInfo) desktop_info = g_desktop_app_info_new(desktop_id);
+        g_autofree const gchar *app_id = NULL;
+        g_autofree const gchar *icon_path = NULL;
+        AppInfo *app_info = NULL;
+        gboolean dbus_activated, graphical;
+
+        if (!desktop_info) {
+            g_warning("Unable to find .desktop file for application '%s'", desktop_id);
+            continue;
+        }
+
+        /* Check the application should be part of the apps list */
+        if (!g_app_info_should_show(appinfo)) {
+            g_debug("Application '%s' shouldn't be shown, skipping...", desktop_id);
+            continue;
+        }
+
+        if (g_desktop_app_info_get_is_hidden(desktop_info)) {
+            g_debug("Application '%s' is hidden, skipping...", desktop_id);
+            continue;
+        }
+        if (g_desktop_app_info_get_nodisplay(desktop_info)) {
+            g_debug("Application '%s' has NoDisplay set, skipping...", desktop_id);
+            continue;
+        }
+
+        /*
+         * The application ID is usually the .desktop file name. However, a common practice
+         * is that .desktop files are named after the executable name, in which case the
+         * "StartupWMClass" property indicates the wayland app-id.
+         */
+        app_id = g_strdup(g_desktop_app_info_get_startup_wm_class(desktop_info));
+        if (!app_id) {
+            app_id = g_strdup(desktop_id);
+            gchar *extension = g_strrstr(app_id, ".desktop");
+            if (extension)
+                *extension = 0;
+        }
+
+        /*
+         * An application can be D-Bus activated if one of those conditions are met:
+         *   - its .desktop file contains a "DBusActivatable=true" line
+         *   - it provides a corresponding D-Bus service file
+         */
+        if (g_desktop_app_info_get_boolean(desktop_info,
+                                           G_KEY_FILE_DESKTOP_KEY_DBUS_ACTIVATABLE)) {
+            dbus_activated = TRUE;
+        } else {
+            const gchar *desktop_filename = g_desktop_app_info_get_filename(desktop_info);
+            g_autofree gchar *service_file = g_strconcat(app_id, ".service", NULL);
+
+            /* Default to non-DBus-activatable */
+            dbus_activated = FALSE;
+
+            for (GStrv xdg_data_dir = dirlist; *xdg_data_dir != NULL ; xdg_data_dir++) {
+                g_autofree gchar *service_path = NULL;
+
+                /* Search only in the XDG_DATA_DIR where the .desktop file is located */
+                if (!g_str_has_prefix(desktop_filename, *xdg_data_dir))
+                    continue;
+
+                service_path = g_build_filename(*xdg_data_dir, "dbus-1", "services",
+                                                service_file, NULL);
+                if (g_file_test(service_path, G_FILE_TEST_EXISTS)) {
+                    dbus_activated = TRUE;
+                    break;
+                }
+            }
+        }
+
+        /* Applications with "Terminal=True" are not graphical apps */
+        graphical = !g_desktop_app_info_get_boolean(desktop_info,
+                                                    G_KEY_FILE_DESKTOP_KEY_TERMINAL);
+
+        /*
+         * GAppInfo retrieves the icon data but doesn't provide a way to retrieve
+         * the corresponding file name, so we have to look it up by ourselves.
+         */
+        if (icon)
+            icon_path = applaunchd_utils_get_icon(dirlist, g_icon_to_string(icon));
+
+        app_info = app_info_new(app_id, g_app_info_get_name(appinfo),
+                                icon_path ? icon_path : "",
+                                dbus_activated ? "" : g_app_info_get_commandline(appinfo),
+                                dbus_activated, graphical);
+
+        g_debug("Adding application '%s'", app_id);
+
+        self->apps_list = g_list_append(self->apps_list, app_info);
+    }
+}
+
+/*
+ * Construct the application list to be sent over D-Bus. It has format "av", meaning
+ * the list itself is an array, each item being a variant consisting of 3 strings:
+ *   - app-id
+ *   - app name
+ *   - icon path
+ */
+static GVariant *app_launcher_get_list_variant(AppLauncher *self, gboolean graphical)
+{
+    GVariantBuilder builder;
+    guint len = g_list_length(self->apps_list);
+
+    /* Init array variant for storing the applications list */
+    g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
+
+    for (guint i = 0; i < len; i++) {
+        GVariantBuilder app_builder;
+        AppInfo *app_info = g_list_nth_data(self->apps_list, i);
+
+        if (graphical && !app_info_get_graphical(app_info))
+            continue;
+
+        g_variant_builder_init (&app_builder, G_VARIANT_TYPE("(sss)"));
+
+        /* Create application entry */
+        g_variant_builder_add(&app_builder, "s", app_info_get_app_id(app_info));
+        g_variant_builder_add(&app_builder, "s", app_info_get_name(app_info));
+        g_variant_builder_add(&app_builder, "s", app_info_get_icon_path(app_info));
+
+        /* Add entry to apps list */
+        g_variant_builder_add(&builder, "v", g_variant_builder_end(&app_builder));
+    }
+
+    return g_variant_builder_end(&builder);
+}
+
+/*
+ * Starts the requested application using either the D-Bus activation manager
+ * or the process manager.
+ */
+static gboolean app_launcher_start_app(AppLauncher *self, AppInfo *app_info)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_LAUNCHER(self), FALSE);
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(app_info), FALSE);
+
+    AppStatus app_status = app_info_get_status(app_info);
+    const gchar *app_id = app_info_get_app_id(app_info);
+
+    switch (app_status) {
+    case APP_STATUS_STARTING:
+        g_debug("Application '%s' is already starting", app_id);
+        return TRUE;
+    case APP_STATUS_RUNNING:
+        g_debug("Application '%s' is already running", app_id);
+        /*
+        * The application may be running in the background, activate it
+        * and notify subscribers it should be activated/brought to the
+        * foreground
+        */
+        if (app_info_get_dbus_activated(app_info))
+            dbus_activation_manager_activate_app(self->dbus_manager, app_info);
+        return TRUE;
+    case APP_STATUS_INACTIVE:
+        if (app_info_get_dbus_activated(app_info))
+            dbus_activation_manager_start_app(self->dbus_manager, app_info);
+        else
+            process_manager_start_app(self->process_manager, app_info);
+        return TRUE;
+    default:
+        g_critical("Unknown status %d for application '%s'", app_status, app_id);
+        break;
+    }
+
+    return FALSE;
+}
+
+/*
+ * Internal callbacks
+ */
+
+/*
+ * Handler for the "start" D-Bus method.
+ */
+static gboolean app_launcher_handle_start(applaunchdAppLaunch *object,
+                                          GDBusMethodInvocation *invocation,
+                                          const gchar *app_id)
+{
+    AppInfo *app;
+    AppLauncher *self = APPLAUNCHD_APP_LAUNCHER(object);
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_LAUNCHER(self), FALSE);
+
+    /* Seach the apps list for the given app-id */
+    app = app_launcher_get_app_info(self, app_id);
+    if (!app) {
+        g_dbus_method_invocation_return_error(invocation, G_DBUS_ERROR,
+                                              G_DBUS_ERROR_INVALID_ARGS,
+                                              "Unknown application '%s'",
+                                              app_id);
+        return FALSE;
+    }
+
+    app_launcher_start_app(self, app);
+    applaunchd_app_launch_complete_start(object, invocation);
+
+    return TRUE;
+}
+
+/*
+ * Handler for the "listApplications" D-Bus method.
+ */
+static gboolean app_launcher_handle_list_applications(applaunchdAppLaunch *object,
+                                                      GDBusMethodInvocation *invocation,
+                                                      gboolean graphical)
+{
+    GVariant *result = NULL;
+    AppLauncher *self = APPLAUNCHD_APP_LAUNCHER(object);
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_LAUNCHER(self), FALSE);
+
+    /* Retrieve the applications list in the right format for sending over D-Bus */
+    result = app_launcher_get_list_variant(self, graphical);
+    applaunchd_app_launch_complete_list_applications(object, invocation, result);
+
+    return TRUE;
+}
+
+/*
+ * Callback for the "started" signal emitted by both the
+ * process manager and D-Bus activation manager. Forwards
+ * the signal to other applications through D-Bus.
+ */
+static void app_launcher_started_cb(AppLauncher *self,
+                                    const gchar *app_id,
+                                    gpointer caller)
+{
+    applaunchdAppLaunch *iface = APPLAUNCHD_APP_LAUNCH(self);
+    g_return_if_fail(APPLAUNCHD_IS_APP_LAUNCH(iface));
+
+    g_debug("Application '%s' started", app_id);
+    /*
+     * Emit the "started" D-Bus signal so subscribers get notified
+     * the application with ID "app_id" started and should be
+     * activated
+     */
+    applaunchd_app_launch_emit_started(iface, app_id);
+}
+
+/*
+ * Callback for the "terminated" signal emitted by both the
+ * process manager and D-Bus activation manager. Forwards
+ * the signal to other applications through D-Bus.
+ */
+static void app_launcher_terminated_cb(AppLauncher *self,
+                                       const gchar *app_id,
+                                       gpointer caller)
+{
+    applaunchdAppLaunch *iface = APPLAUNCHD_APP_LAUNCH(self);
+    g_return_if_fail(APPLAUNCHD_IS_APP_LAUNCH(iface));
+
+    g_debug("Application '%s' terminated", app_id);
+    /*
+     * Emit the "terminated" D-Bus signal so subscribers get
+     * notified the application with ID "app_id" terminated
+     */
+    applaunchd_app_launch_emit_terminated(iface, app_id);
+}
+
+/*
+ * Initialization & cleanup functions
+ */
+
+static void app_launcher_dispose(GObject *object)
+{
+    AppLauncher *self = APPLAUNCHD_APP_LAUNCHER(object);
+
+    if (self->apps_list)
+        g_list_free_full(g_steal_pointer(&self->apps_list), g_object_unref);
+
+    g_clear_object(&self->dbus_manager);
+    g_clear_object(&self->process_manager);
+
+    G_OBJECT_CLASS(app_launcher_parent_class)->dispose(object);
+}
+
+static void app_launcher_finalize(GObject *object)
+{
+    G_OBJECT_CLASS(app_launcher_parent_class)->finalize(object);
+}
+
+static void app_launcher_class_init(AppLauncherClass *klass)
+{
+    GObjectClass *object_class = (GObjectClass *)klass;
+
+    object_class->dispose = app_launcher_dispose;
+}
+
+static void app_launcher_iface_init(applaunchdAppLaunchIface *iface)
+{
+    iface->handle_start = app_launcher_handle_start;
+    iface->handle_list_applications = app_launcher_handle_list_applications;
+}
+
+static void app_launcher_init (AppLauncher *self)
+{
+    /*
+     * Create the process manager and connect to its signals
+     * so we get notified on app startup/termination
+     */
+    self->process_manager = g_object_new(APPLAUNCHD_TYPE_PROCESS_MANAGER,
+                                         NULL);
+    g_signal_connect_swapped(self->process_manager, "started",
+                             G_CALLBACK(app_launcher_started_cb), self);
+    g_signal_connect_swapped(self->process_manager, "terminated",
+                             G_CALLBACK(app_launcher_terminated_cb), self);
+
+    /*
+     * Create the D-Bus activation manager and connect to its signals
+     * so we get notified on app startup/termination
+     */
+    self->dbus_manager = g_object_new(APPLAUNCHD_TYPE_DBUS_ACTIVATION_MANAGER,
+                                      NULL);
+    g_signal_connect_swapped(self->dbus_manager, "started",
+                             G_CALLBACK(app_launcher_started_cb), self);
+    g_signal_connect_swapped(self->dbus_manager, "terminated",
+                             G_CALLBACK(app_launcher_terminated_cb), self);
+
+    /* Initialize the applications list */
+    app_launcher_update_applications_list(self);
+}
+
+/*
+ * Public functions
+ */
+
+AppLauncher *app_launcher_get_default(void)
+{
+    static AppLauncher *launcher;
+
+    /*
+    * AppLauncher is a singleton, only create the object if it doesn't
+    * exist already.
+    */
+    if (launcher == NULL) {
+        g_debug("Initializing app launcher service...");
+        launcher = g_object_new(APPLAUNCHD_TYPE_APP_LAUNCHER, NULL);
+        g_object_add_weak_pointer(G_OBJECT(launcher), (gpointer *)&launcher);
+    }
+
+    return launcher;
+}
+
+/*
+ * Search the applications list for an app which matches the provided app-id
+ * and return the corresponding AppInfo object.
+ */
+AppInfo *app_launcher_get_app_info(AppLauncher *self, const gchar *app_id)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_LAUNCHER(self), NULL);
+
+    guint len = g_list_length(self->apps_list);
+
+    for (guint i = 0; i < len; i++) {
+        AppInfo *app_info = g_list_nth_data(self->apps_list, i);
+
+        if (g_strcmp0(app_info_get_app_id(app_info), app_id) == 0)
+            return app_info;
+    }
+
+    g_warning("Unable to find application with ID '%s'", app_id);
+
+    return NULL;
+}
diff --git a/src/app_launcher.h b/src/app_launcher.h
new file mode 100644
index 0000000..789f091
--- /dev/null
+++ b/src/app_launcher.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef APPLAUNCHER_H
+#define APPLAUNCHER_H
+
+#include <glib-object.h>
+
+#include "applaunch-dbus.h"
+#include "app_info.h"
+
+G_BEGIN_DECLS
+
+#define APPLAUNCHD_TYPE_APP_LAUNCHER app_launcher_get_type()
+
+G_DECLARE_FINAL_TYPE(AppLauncher, app_launcher, APPLAUNCHD, APP_LAUNCHER,
+                     applaunchdAppLaunchSkeleton);
+
+AppLauncher *app_launcher_get_default(void);
+
+AppInfo *app_launcher_get_app_info(AppLauncher *self, const gchar *app_id);
+
+G_END_DECLS
+
+#endif
diff --git a/src/dbus_activation_manager.c b/src/dbus_activation_manager.c
new file mode 100644
index 0000000..3c31ee6
--- /dev/null
+++ b/src/dbus_activation_manager.c
@@ -0,0 +1,258 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gio/gio.h>
+
+#include "app_launcher.h"
+#include "dbus_activation_manager.h"
+#include "fdo-dbus.h"
+
+struct _DBusActivationManager {
+    GObject parent_instance;
+};
+
+G_DEFINE_TYPE(DBusActivationManager, dbus_activation_manager, G_TYPE_OBJECT);
+
+enum {
+    STARTED,
+    TERMINATED,
+    N_SIGNALS
+};
+static guint signals[N_SIGNALS];
+
+/*
+ * Application info structure, used for storing relevant data
+ * in the `starting_apps` and `running_apps` lists
+ */
+struct dbus_runtime_data {
+    guint watcher;
+    fdoApplication *fdo_proxy;
+};
+
+/*
+ * Initialization & cleanup functions
+ */
+
+static void dbus_activation_manager_dispose(GObject *object)
+{
+    G_OBJECT_CLASS(dbus_activation_manager_parent_class)->dispose(object);
+}
+
+static void dbus_activation_manager_finalize(GObject *object)
+{
+    G_OBJECT_CLASS(dbus_activation_manager_parent_class)->finalize(object);
+}
+
+static void dbus_activation_manager_class_init(DBusActivationManagerClass *klass)
+{
+    GObjectClass *object_class = (GObjectClass *)klass;
+
+    object_class->dispose = dbus_activation_manager_dispose;
+    object_class->finalize = dbus_activation_manager_finalize;
+
+    signals[STARTED] = g_signal_new("started", G_TYPE_FROM_CLASS(klass),
+                                    G_SIGNAL_RUN_LAST, 0 ,
+                                    NULL, NULL, NULL, G_TYPE_NONE,
+                                    1, G_TYPE_STRING);
+
+    signals[TERMINATED] = g_signal_new("terminated", G_TYPE_FROM_CLASS(klass),
+                                       G_SIGNAL_RUN_LAST, 0,
+                                       NULL, NULL, NULL, G_TYPE_NONE,
+                                       1, G_TYPE_STRING);
+}
+
+static void dbus_activation_manager_init(DBusActivationManager *self)
+{
+}
+
+/*
+ * Internal callbacks
+ */
+
+/*
+ * This function is called when a D-Bus name we're watching just vanished
+ * from the session bus. This indicates the underlying application terminated,
+ * so we must remove it from the list of running apps and notify listeners
+ * of the app termination so they can act accordingly.
+ */
+static void dbus_activation_manager_app_terminated_cb(GDBusConnection *connection,
+                                                      const gchar *name,
+                                                      gpointer data)
+{
+    DBusActivationManager *self = data;
+    AppLauncher *app_launcher = app_launcher_get_default();
+    AppInfo *app_info;
+    struct dbus_runtime_data *runtime_data;
+
+    g_return_if_fail(APPLAUNCHD_IS_DBUS_ACTIVATION_MANAGER(self));
+    g_return_if_fail(APPLAUNCHD_IS_APP_LAUNCHER(app_launcher));
+
+    app_info = app_launcher_get_app_info(app_launcher, name);
+    g_return_if_fail(APPLAUNCHD_IS_APP_INFO(app_info));
+
+    runtime_data = app_info_get_runtime_data(app_info);
+    g_debug("Application '%s' vanished from D-Bus", name);
+
+    app_info_set_status(app_info, APP_STATUS_INACTIVE);
+    app_info_set_runtime_data(app_info, NULL);
+
+    dbus_activation_manager_free_runtime_data(runtime_data);
+
+    g_signal_emit(self, signals[TERMINATED], 0, name);
+}
+
+/*
+ * Function called when the name appeared on D-Bus, meaning the application
+ * successfully started and registered its D-Bus service.
+ */
+static void dbus_activation_manager_app_started_cb(GDBusConnection *connection,
+                                                   const gchar *name,
+                                                   const gchar *name_owner,
+                                                   gpointer data)
+{
+    DBusActivationManager *self = data;
+    AppLauncher *app_launcher = app_launcher_get_default();
+    AppInfo *app_info;
+    struct dbus_runtime_data *runtime_data;
+
+    g_return_if_fail(APPLAUNCHD_IS_DBUS_ACTIVATION_MANAGER(self));
+    g_return_if_fail(APPLAUNCHD_IS_APP_LAUNCHER(app_launcher));
+
+    app_info = app_launcher_get_app_info(app_launcher, name);
+    g_return_if_fail(APPLAUNCHD_IS_APP_INFO(app_info));
+
+    runtime_data = app_info_get_runtime_data(app_info);
+
+    g_debug("Application '%s' appeared on D-Bus", name);
+    app_info_set_status(app_info, APP_STATUS_RUNNING);
+    dbus_activation_manager_activate_app(self, app_info);
+}
+
+/*
+ * Public functions
+ */
+
+DBusActivationManager *dbus_activation_manager_new(void)
+{
+    return g_object_new(APPLAUNCHD_TYPE_DBUS_ACTIVATION_MANAGER, NULL);
+}
+
+/*
+ * Start an application using D-Bus activation.
+ */
+gboolean dbus_activation_manager_start_app(DBusActivationManager *self,
+                                           AppInfo *app_info)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_DBUS_ACTIVATION_MANAGER(self), FALSE);
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(app_info), FALSE);
+
+    g_autoptr(GError) error = NULL;
+    const gchar *app_id = app_info_get_app_id(app_info);
+    struct dbus_runtime_data *runtime_data = g_new0(struct dbus_runtime_data, 1);
+
+    if (!runtime_data) {
+        g_critical("Unable to allocate runtime data structure for '%s'",
+                   app_id);
+        return FALSE;
+    }
+
+    /*
+     * g_bus_watch_name() requests D-Bus activation (due to
+     * G_BUS_NAME_WATCHER_FLAGS_AUTO_START) and subscribes to name
+     * owner changes so we get notified when the requested application
+     * appears and vanishes from D-Bus.
+     */
+    runtime_data->watcher = g_bus_watch_name(G_BUS_TYPE_SESSION, app_id,
+                                             G_BUS_NAME_WATCHER_FLAGS_AUTO_START,
+                                             dbus_activation_manager_app_started_cb,
+                                             dbus_activation_manager_app_terminated_cb,
+                                             self, NULL);
+    if (runtime_data->watcher == 0) {
+        g_critical("Unable to request D-Bus activation for '%s'", app_id);
+        dbus_activation_manager_free_runtime_data(runtime_data);
+        return FALSE;
+    }
+
+    /* Update application status */
+    app_info_set_status(app_info, APP_STATUS_STARTING);
+    app_info_set_runtime_data(app_info, runtime_data);
+
+    return TRUE;
+}
+
+/*
+ * Once an application has been started through D-Bus, we must activate it
+ * so it shows its main window, if any.
+ * This function doesn't raise an error as headless applications will likely
+ * not implement the org.freedesktop.Application interface.
+ */
+gboolean dbus_activation_manager_activate_app(DBusActivationManager *self,
+                                              AppInfo *app)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_DBUS_ACTIVATION_MANAGER(self), FALSE);
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(app), FALSE);
+
+    g_autoptr(GError) error = NULL;
+    struct dbus_runtime_data *runtime_data = app_info_get_runtime_data(app);
+    const gchar *app_id = app_info_get_app_id(app);
+
+    g_return_val_if_fail(runtime_data != NULL, FALSE);
+
+    /* Base object for interface "org.example.Iface" is "/org/example/Iface" */
+    g_autofree gchar *path = g_strconcat("/", app_id, NULL);
+    g_strdelimit(path, ".", '/');
+
+    if (!runtime_data->fdo_proxy) {
+        runtime_data->fdo_proxy =
+                fdo_application_proxy_new_for_bus_sync(G_BUS_TYPE_SESSION,
+                                                       G_DBUS_PROXY_FLAGS_NONE,
+                                                       app_id, path, NULL,
+                                                       &error);
+    }
+
+    if (runtime_data->fdo_proxy) {
+        GVariantDict dict;
+
+        g_variant_dict_init(&dict, NULL);
+
+        fdo_application_call_activate_sync (runtime_data->fdo_proxy,
+                                            g_variant_dict_end(&dict),
+                                            NULL, &error);
+        if (error) {
+            g_warning("Error activating application %s: %s", app_id,
+                      error->message);
+        }
+    } else if (error) {
+        g_warning("Error creating D-Bus proxy for %s: %s", app_id,
+                    error->message);
+    }
+
+    g_signal_emit(self, signals[STARTED], 0, app_id);
+
+    return TRUE;
+}
+
+void dbus_activation_manager_free_runtime_data(gpointer data)
+{
+    struct dbus_runtime_data *runtime_data = data;
+
+    g_return_if_fail(runtime_data != NULL);
+
+    g_clear_object(&runtime_data->fdo_proxy);
+    if (runtime_data->watcher > 0)
+        g_bus_unwatch_name(runtime_data->watcher);
+    g_free(runtime_data);
+}
diff --git a/src/dbus_activation_manager.h b/src/dbus_activation_manager.h
new file mode 100644
index 0000000..e475da4
--- /dev/null
+++ b/src/dbus_activation_manager.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef DBUSACTIVATIONMANAGER_H
+#define DBUSACTIVATIONMANAGER_H
+
+#include <glib-object.h>
+
+#include "app_info.h"
+
+G_BEGIN_DECLS
+
+#define APPLAUNCHD_TYPE_DBUS_ACTIVATION_MANAGER dbus_activation_manager_get_type()
+
+G_DECLARE_FINAL_TYPE(DBusActivationManager, dbus_activation_manager,
+                     APPLAUNCHD, DBUS_ACTIVATION_MANAGER, GObject);
+
+DBusActivationManager *dbus_activation_manager_new(void);
+
+gboolean dbus_activation_manager_start_app(DBusActivationManager *self,
+                                           AppInfo *app_info);
+gboolean dbus_activation_manager_activate_app(DBusActivationManager *self,
+                                              AppInfo *app_info);
+
+void dbus_activation_manager_free_runtime_data(gpointer data);
+
+G_END_DECLS
+
+#endif
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..d19038a
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <glib.h>
+#include <glib-unix.h>
+
+#include "app_launcher.h"
+#include "applaunch-dbus.h"
+
+#define APPLAUNCH_DBUS_NAME "org.automotivelinux.AppLaunch"
+#define APPLAUNCH_DBUS_PATH "/org/automotivelinux/AppLaunch"
+
+static GMainLoop *main_loop = NULL;
+
+static gboolean quit_cb(gpointer user_data)
+{
+    g_info("Quitting...");
+
+    if (main_loop)
+        g_idle_add(G_SOURCE_FUNC(g_main_loop_quit), main_loop);
+    else
+        exit(0);
+
+    return G_SOURCE_REMOVE;
+}
+
+static void bus_acquired_cb(GDBusConnection *connection, const gchar *name,
+                            gpointer user_data)
+{
+    AppLauncher *launcher = user_data;
+
+    g_debug("Bus acquired, starting service...");
+    g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(launcher),
+                                     connection, APPLAUNCH_DBUS_PATH, NULL);
+}
+
+static void name_acquired_cb(GDBusConnection *connection, const gchar *name,
+                             gpointer user_data)
+{
+    g_debug("D-Bus name '%s' was acquired", name);
+}
+
+static void name_lost_cb(GDBusConnection *connection, const gchar *name,
+                         gpointer user_data)
+{
+    g_critical("Lost the '%s' service name, quitting...", name);
+    g_main_loop_quit(main_loop);
+}
+
+int main(int argc, char *argv[])
+{
+    g_unix_signal_add(SIGTERM, quit_cb, NULL);
+    g_unix_signal_add(SIGINT, quit_cb, NULL);
+
+    main_loop = g_main_loop_new(NULL, FALSE);
+
+    AppLauncher *launcher = app_launcher_get_default();
+    gint owner_id = g_bus_own_name(G_BUS_TYPE_SESSION, APPLAUNCH_DBUS_NAME,
+                                   G_BUS_NAME_OWNER_FLAGS_NONE, bus_acquired_cb,
+                                   name_acquired_cb, name_lost_cb,
+                                   launcher, NULL);
+
+    g_main_loop_run(main_loop);
+    g_main_loop_unref(main_loop);
+
+    g_object_unref(launcher);
+
+    g_bus_unown_name (owner_id);
+
+    return 0;
+}
diff --git a/src/meson.build b/src/meson.build
new file mode 100644
index 0000000..81d1f0c
--- /dev/null
+++ b/src/meson.build
@@ -0,0 +1,37 @@
+#
+# Copyright (C) 2021 Collabora Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+applaunchd_deps = [
+    dependency('gobject-2.0'),
+    dependency('gio-unix-2.0'),
+]
+
+executable (
+    'applaunchd',
+    config_h,
+    [
+        generated_dbus_sources,
+        'main.c',
+        'app_info.c', 'app_info.h',
+        'app_launcher.c', 'app_launcher.h',
+        'dbus_activation_manager.c', 'dbus_activation_manager.h',
+        'process_manager.c', 'process_manager.h',
+        'utils.c', 'utils.h',
+    ],
+    dependencies : applaunchd_deps,
+    include_directories : include_directories('..'),
+    install : true
+)
diff --git a/src/process_manager.c b/src/process_manager.c
new file mode 100644
index 0000000..023894a
--- /dev/null
+++ b/src/process_manager.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "app_launcher.h"
+#include "process_manager.h"
+
+struct _ProcessManager {
+    GObject parent_instance;
+
+    GList *process_data;
+};
+
+G_DEFINE_TYPE(ProcessManager, process_manager, G_TYPE_OBJECT);
+
+enum {
+  STARTED,
+  TERMINATED,
+  N_SIGNALS
+};
+static guint signals[N_SIGNALS];
+
+/*
+ * Application info structure, used for storing relevant data
+ * in the `running_apps` list
+ */
+struct process_runtime_data {
+    guint watcher;
+    GPid pid;
+    const gchar *app_id;
+};
+
+/*
+ * Initialization & cleanup functions
+ */
+
+static void process_manager_dispose(GObject *object)
+{
+    ProcessManager *self = APPLAUNCHD_PROCESS_MANAGER(object);
+
+    g_return_if_fail(APPLAUNCHD_IS_PROCESS_MANAGER(self));
+
+    if (self->process_data)
+        g_list_free_full(g_steal_pointer(&self->process_data), g_free);
+
+    G_OBJECT_CLASS(process_manager_parent_class)->dispose(object);
+}
+
+static void process_manager_finalize(GObject *object)
+{
+    G_OBJECT_CLASS(process_manager_parent_class)->finalize(object);
+}
+
+static void process_manager_class_init(ProcessManagerClass *klass)
+{
+    GObjectClass *object_class = (GObjectClass *)klass;
+
+    object_class->dispose = process_manager_dispose;
+    object_class->finalize = process_manager_finalize;
+
+    signals[STARTED] = g_signal_new("started", G_TYPE_FROM_CLASS (klass),
+                                    G_SIGNAL_RUN_LAST, 0 ,
+                                    NULL, NULL, NULL, G_TYPE_NONE,
+                                    1, G_TYPE_STRING);
+
+    signals[TERMINATED] = g_signal_new("terminated", G_TYPE_FROM_CLASS (klass),
+                                       G_SIGNAL_RUN_LAST, 0 ,
+                                       NULL, NULL, NULL, G_TYPE_NONE,
+                                       1, G_TYPE_STRING);
+}
+
+static void process_manager_init(ProcessManager *self)
+{
+}
+
+/*
+ * Internal functions
+ */
+
+static const gchar *get_app_id_for_pid(ProcessManager *self, GPid pid)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_PROCESS_MANAGER(self), NULL);
+
+    AppLauncher *app_launcher = app_launcher_get_default();
+    guint len = g_list_length(self->process_data);
+
+    for (guint i = 0; i < len; i++) {
+        struct process_runtime_data *runtime_data =
+                                g_list_nth_data(self->process_data, i);
+
+        if (runtime_data->pid == pid)
+            return runtime_data->app_id;
+    }
+
+    return NULL;
+}
+
+/*
+ * Internal callbacks
+ */
+
+/*
+ * This function is called when a watched process terminated, so we can:
+ *   - cleanup this application's data (and reap the process so it
+ *     doesn't become a zombie)
+ *   - notify listeners that the process terminated
+ */
+static void process_manager_app_terminated_cb(GPid pid,
+                                              gint wait_status,
+                                              gpointer data)
+{
+    ProcessManager *self = data;
+    AppLauncher *app_launcher = app_launcher_get_default();
+    struct process_runtime_data *runtime_data;
+    const gchar *app_id;
+    AppInfo *app_info;
+
+    g_return_if_fail(APPLAUNCHD_IS_PROCESS_MANAGER(self));
+
+    app_id = get_app_id_for_pid(self, pid);
+    if (!app_id) {
+        g_warning("Unable to retrieve app id for pid %d", pid);
+        return;
+    }
+
+    app_info = app_launcher_get_app_info(app_launcher, app_id);
+    if (!app_info) {
+        g_warning("Unable to find running app with pid %d", pid);
+        return;
+    }
+
+    if (g_spawn_check_exit_status(wait_status, NULL))
+        g_debug("Application '%s' terminated with exit code %i",
+                app_id, WEXITSTATUS(wait_status));
+    else
+        g_warning("Application '%s' crashed", app_id);
+
+    g_spawn_close_pid(pid);
+
+    runtime_data = app_info_get_runtime_data(app_info);
+    g_source_remove(runtime_data->watcher);
+
+    app_info_set_status(app_info, APP_STATUS_INACTIVE);
+    app_info_set_runtime_data(app_info, NULL);
+
+    self->process_data = g_list_remove(self->process_data, runtime_data);
+    g_free(runtime_data);
+
+    g_signal_emit(self, signals[TERMINATED], 0, app_id);
+}
+
+/*
+ * Public functions
+ */
+
+ProcessManager *process_manager_new(void)
+{
+    return g_object_new(APPLAUNCHD_TYPE_PROCESS_MANAGER, NULL);
+}
+
+/*
+ * Start an application by executing the provided command line.
+ */
+gboolean process_manager_start_app(ProcessManager *self,
+                                   AppInfo *app_info)
+{
+    g_return_val_if_fail(APPLAUNCHD_IS_PROCESS_MANAGER(self), FALSE);
+    g_return_val_if_fail(APPLAUNCHD_IS_APP_INFO(app_info), FALSE);
+
+    gboolean success;
+    g_autofree GStrv args = NULL;
+    const gchar *app_id = app_info_get_app_id(app_info);
+    const gchar *command = app_info_get_command(app_info);
+    struct process_runtime_data *runtime_data;
+
+    runtime_data = g_new0(struct process_runtime_data, 1);
+    if (!runtime_data) {
+        g_critical("Unable to allocate runtime data structure for '%s'",
+                   app_id);
+        return FALSE;
+    }
+
+    runtime_data->app_id = app_id;
+
+    args = g_strsplit(command, " ", -1);
+    success = g_spawn_async(NULL, args, NULL,
+                            G_SPAWN_DO_NOT_REAP_CHILD | G_SPAWN_SEARCH_PATH,
+                            NULL, NULL, &runtime_data->pid, NULL);
+    if (!success) {
+        g_critical("Unable to start application '%s'", app_id);
+        g_free(runtime_data);
+        return FALSE;
+    }
+
+    /*
+     * Add a watcher for the child PID in order to get notified when it dies
+     */
+    runtime_data->watcher = g_child_watch_add(runtime_data->pid,
+                                              process_manager_app_terminated_cb,
+                                              self);
+    self->process_data = g_list_append(self->process_data, runtime_data);
+    app_info_set_runtime_data(app_info, runtime_data);
+
+    g_signal_emit(self, signals[STARTED], 0, app_id);
+
+    return TRUE;
+}
diff --git a/src/process_manager.h b/src/process_manager.h
new file mode 100644
index 0000000..1979cba
--- /dev/null
+++ b/src/process_manager.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef PROCESSMANAGER_H
+#define PROCESSMANAGER_H
+
+#include <glib-object.h>
+
+#include "app_info.h"
+
+G_BEGIN_DECLS
+
+#define APPLAUNCHD_TYPE_PROCESS_MANAGER process_manager_get_type()
+
+G_DECLARE_FINAL_TYPE(ProcessManager, process_manager,
+                     APPLAUNCHD, PROCESS_MANAGER, GObject);
+
+ProcessManager *process_manager_new(void);
+
+gboolean process_manager_start_app(ProcessManager *self,
+                                   AppInfo *app_info);
+
+G_END_DECLS
+
+#endif
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..a053638
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gio/gio.h>
+
+#include "utils.h"
+
+/* Search by descending quality level */
+static const gchar *icon_sizes[] = {
+    "scalable",
+    "512x512",
+    "256x256",
+    "192x192",
+    "128x128",
+    "96x96",
+    "72x72",
+    "64x64",
+    "48x48",
+    "32x32",
+    "24x24",
+    "16x16",
+    "symbolic",
+    NULL
+};
+
+/*
+ * Recursively search the `base_path` folder for a file whose name
+ * starts with `icon_name`: this way we don't care about the extension
+ * and can also get files with an extended name (for example,
+ * "`icon_name`-symbolic.png" would still be recognized as a valid match)
+ */
+static gchar *find_icon(const gchar *base_path, const gchar *icon_name)
+{
+    g_autoptr(GFile) base_dir = g_file_new_for_path(base_path);
+    g_autoptr(GFileEnumerator) child_list =
+            g_file_enumerate_children(base_dir, "*", G_FILE_QUERY_INFO_NONE,
+                                      NULL, NULL);
+
+    if (!child_list)
+        return NULL;
+
+    while (TRUE) {
+        GFile *current_file;
+        GFileInfo *current_file_info;
+
+        g_file_enumerator_iterate(child_list, &current_file_info,
+                                  &current_file, NULL, NULL);
+        if (!current_file_info || !current_file)
+            break;
+
+        if (g_file_info_get_file_type(current_file_info) == G_FILE_TYPE_DIRECTORY) {
+            gchar *icon_path = find_icon(g_file_get_path(current_file), icon_name);
+            if (icon_path)
+                return icon_path;
+        } else if (g_str_has_prefix(g_file_get_basename(current_file), icon_name)) {
+            return g_strdup(g_file_get_path(current_file));
+        }
+    }
+
+    return NULL;
+}
+
+/*
+ * Search through a list of folders for the `icon_name` icon file
+ */
+gchar *applaunchd_utils_get_icon(GStrv dir_list, const gchar *icon_name)
+{
+    gchar *icon_path = NULL;
+
+    for (GStrv base_path = dir_list; *base_path != NULL ; base_path++) {
+        g_autoptr(GFile) base_dir = g_file_new_build_filename(*base_path,
+                                                              "icons", NULL);
+
+        g_autoptr(GFileEnumerator) child_list =
+                g_file_enumerate_children(base_dir, "standard::type=directory",
+                                          G_FILE_QUERY_INFO_NONE, NULL, NULL);
+
+        if (!child_list)
+            continue;
+
+        while (TRUE) {
+            GFile *theme_dir;
+            g_file_enumerator_iterate(child_list, NULL, &theme_dir,
+                                      NULL, NULL);
+            if (!theme_dir)
+                break;
+
+            for (gint i = 0; icon_sizes[i]; i++) {
+                g_autofree gchar *theme_path =
+                        g_build_filename(g_file_get_path(theme_dir),
+                                         icon_sizes[i], NULL);
+                icon_path = find_icon(theme_path, icon_name);
+                if (icon_path)
+                    return icon_path;
+            }
+        }
+    }
+
+    return NULL;
+}
diff --git a/src/utils.h b/src/utils.h
new file mode 100644
index 0000000..1f31e0d
--- /dev/null
+++ b/src/utils.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2021 Collabora Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef UTILS_H
+#define UTILS_H
+
+#include <glib.h>
+
+gchar *applaunchd_utils_get_icon(GStrv dir_list, const gchar *icon_name);
+
+#endif