Add dnf5 posttrans notify plugin

Just like #600, we should do the same for dnf5

backends/dnf/meson.build

@@ -1,6 +1,8 @@
 appstream_dep = dependency('appstream', version: '>=0.14.0')
 dnf_dep = dependency('libdnf', version: '>=0.43.1')
+dnf5_dep = dependency('libdnf5').partial_dependency(includes: true, compile_args: true)
 rpm_dep = dependency('rpm')
+sdbus_cpp_dep = dependency('sdbus-c++')
 c_args = ['-DG_LOG_DOMAIN="PackageKit-DNF"']
 
 if meson.get_compiler('c').has_function('hy_query_get_advisory_pkgs', prefix: '#include <libdnf/hy-query.h>', dependencies: dnf_dep)
@@ -20,6 +22,26 @@ install_data(
   install_dir: join_paths(python_package_dir),
 )
 
+add_languages('cpp')
+shared_module(
+  'notify_packagekit',
+  'notify_packagekit.cpp',
+  cpp_args: '-std=c++20',
+  include_directories: packagekit_glib2_includes,
+  dependencies: [
+    dnf5_dep,
+    sdbus_cpp_dep,
+  ],
+  name_prefix: '',
+  install: true,
+  install_dir: get_option('libdir') / 'libdnf5/plugins/',
+)
+
+install_data(
+  'notify_packagekit.conf',
+  install_dir: get_option('sysconfdir') / 'dnf/libdnf5-plugins/'
+)
+
 shared_module(
   'pk_backend_dnf',
   'dnf-backend-vendor-@0@.c'.format(get_option('dnf_vendor')),

backends/dnf/notify_packagekit.conf

@@ -0,0 +1,3 @@
+[main]
+name = notify_packagekit
+enabled = yes

backends/dnf/notify_packagekit.cpp

@@ -0,0 +1,90 @@
+// Copyright (C) 2024 Alessandro Astone <ales.astone@gmail.com>
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include <libdnf5/base/base.hpp>
+#include <libdnf5/common/exception.hpp>
+
+#include <sdbus-c++/sdbus-c++.h>
+
+#include <algorithm>
+#include <cstdlib>
+
+#include <packagekit-glib2/pk-version.h>
+
+using namespace libdnf5;
+
+namespace {
+
+constexpr const char * PLUGIN_NAME{"notify_packagekit"};
+
+constexpr plugin::Version PLUGIN_VERSION{.major = PK_MAJOR_VERSION, .minor = PK_MINOR_VERSION, .micro = PK_MICRO_VERSION};
+
+constexpr const char * attrs[]{"author.name", "author.email", "description", nullptr};
+constexpr const char * attrs_value[]{"Alessandro Astone", "ales.astone@gmail.com",
+        "Notify packagekitd when packages are installed, updated, or removed."};
+
+class NotifyPackagekitPlugin : public plugin::IPlugin {
+public:
+    NotifyPackagekitPlugin(libdnf5::Base & base, libdnf5::ConfigParser &) : IPlugin(base) {}
+
+    const char * get_name() const noexcept override { return PLUGIN_NAME; }
+
+    plugin::Version get_version() const noexcept override { return PLUGIN_VERSION; }
+
+    PluginAPIVersion get_api_version() const noexcept override { return PLUGIN_API_VERSION; }
+
+    /// Add custom attributes, such as information about yourself and a description of the plugin.
+    /// These can be used to query plugin-specific data through the API.
+    /// Optional to override.
+    const char * const * get_attributes() const noexcept override { return attrs; }
+    const char * get_attribute(const char * attribute) const noexcept override {
+        for (size_t i = 0; attrs[i]; ++i) {
+            if (std::strcmp(attribute, attrs[i]) == 0) {
+                return attrs_value[i];
+            }
+        }
+        return nullptr;
+    }
+
+    void post_transaction(const libdnf5::base::Transaction & transaction) override;
+};
+
+void NotifyPackagekitPlugin::post_transaction(const libdnf5::base::Transaction & transaction) {
+    auto packagekitProxy = sdbus::createProxy("org.freedesktop.PackageKit", "/org/freedesktop/PackageKit");
+    auto method = packagekitProxy->createMethodCall("org.freedesktop.PackageKit", "StateHasChanged");
+    method << "posttrans";
+    packagekitProxy->callMethod(method);
+}
+
+}  // namespace
+
+/// Below is a block of functions with C linkage used for loading the plugin binaries from disk.
+/// All of these are MANDATORY to implement.
+
+/// Return plugin's API version.
+PluginAPIVersion libdnf_plugin_get_api_version(void) {
+    return PLUGIN_API_VERSION;
+}
+
+/// Return plugin's name.
+const char * libdnf_plugin_get_name(void) {
+    return PLUGIN_NAME;
+}
+
+/// Return plugin's version.
+plugin::Version libdnf_plugin_get_version(void) {
+    return PLUGIN_VERSION;
+}
+
+/// Return the instance of the implemented plugin.
+plugin::IPlugin * libdnf_plugin_new_instance(
+    [[maybe_unused]] LibraryVersion library_version, libdnf5::Base & base, libdnf5::ConfigParser & parser) try {
+    return new NotifyPackagekitPlugin(base, parser);
+} catch (...) {
+    return nullptr;
+}
+
+/// Delete the plugin instance.
+void libdnf_plugin_delete_instance(plugin::IPlugin * plugin_object) {
+    delete plugin_object;
+}

tests/ci/Dockerfile-fedora

@@ -1,14 +1,17 @@
-FROM fedora:38
+FROM fedora:40
 
 RUN dnf -y update
 RUN dnf -y install \
 	dnf-plugins-core \
 	libdnf-devel \
+	libdnf5-devel \
 	redhat-rpm-config \
 	meson \
 	gcc \
+	gcc-c++ \
 	ninja-build \
 	dbus-daemon \
+	sdbus-cpp-devel \
 	appstream \
 	appstream-devel
 RUN dnf -y builddep PackageKit