Implement dnf hooks for post-update actions

Similar to previous yum hooks:
 - notify dom0 about installed updates (possibly clear "updates pending"
   marker)
 - trigger appmenus synchronization

QubesOS/qubes-issues#1282

Makefile

@@ -131,6 +131,15 @@ install-rh: install-systemd install-systemd-dropins install-sysvinit
 	install -D -m 0644 misc/dracut-qubes.conf \
 		$(DESTDIR)/usr/lib/dracut/dracut.conf.d/30-qubes.conf
 
+	install -D -m 0644 misc/dnf-qubes-hooks.py \
+		$(DESTDIR)/usr/lib/python2.7/site-packages/dnf-plugins/qubes-hooks.py
+	install -D -m 0644 misc/dnf-qubes-hooks.pyc \
+		$(DESTDIR)/usr/lib/python2.7/site-packages/dnf-plugins/qubes-hooks.pyc
+	install -D -m 0644 misc/dnf-qubes-hooks.pyo \
+		$(DESTDIR)/usr/lib/python2.7/site-packages/dnf-plugins/qubes-hooks.pyo
+	install -D -m 0644 misc/dnf-qubes-hooks.conf $(DESTDIR)/etc/dnf/plugins/qubes-hooks.conf
+
+
 install-common:
 	$(MAKE) -C autostart-dropins install
 	install -m 0644 -D misc/fstab $(DESTDIR)/etc/fstab

misc/dnf-qubes-hooks.conf

@@ -0,0 +1,4 @@
+[main]
+enabled = 1
+notify-updates = 1
+sync-appmenus = 1

misc/dnf-qubes-hooks.py

@@ -0,0 +1,62 @@
+#!/usr/bin/python
+# coding=utf-8
+#
+# The Qubes OS Project, http://www.qubes-os.org
+#
+# Copyright (C) 2015  Marek Marczykowski-Górecki
+#                                <marmarek@invisiblethingslab.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+from __future__ import absolute_import
+import logging
+import dnf
+import subprocess
+
+PLUGIN_CONF = 'qubes-hooks'
+
+class QubesHooks(dnf.Plugin):
+    name = 'qubes-hooks'
+
+    def __init__(self, base, cli):
+        super(QubesHooks, self).__init__(base, cli)
+        self.base = base
+        self.log = logging.getLogger('dnf')
+
+    def transaction(self):
+        config = self.read_config(self.base.conf, PLUGIN_CONF)
+
+        if config.getboolean('main', 'notify-updates'):
+            # Get all updates available _before_ this transaction
+            query = self.base.sack.query()
+            query = query.upgrades()
+            updates = set(query.run())
+            # Get packages installed in this transaction...
+            just_installed = self.base.transaction
+            # ...and filter them out of available updates
+            for item in just_installed:
+                for pkg in item.installs():
+                    updates.discard(pkg)
+            subprocess.call([
+                '/usr/lib/qubes/qrexec-client-vm',
+                'dom0',
+                'qubes.NotifyUpdates',
+                '/bin/echo',
+                str(len(updates))
+            ])
+
+        if config.getboolean('main', 'sync-appmenus'):
+            self.log.info("Sending application list and icons to dom0")
+            subprocess.call(['/usr/lib/qubes/qubes-trigger-sync-appmenus.sh'])

rpm_spec/core-vm.spec

@@ -332,6 +332,7 @@ rm -f %{name}-%{version}
 %config(noreplace) /etc/yum.conf.d/qubes-proxy.conf
 %config(noreplace) /etc/yum.repos.d/qubes-r3.repo
 /etc/yum/pluginconf.d/yum-qubes-hooks.conf
+%config(noreplace) /etc/dnf/plugins/qubes-hooks.conf
 /etc/yum/post-actions/qubes-trigger-sync-appmenus.action
 /usr/lib/systemd/system/user@.service.d/90-session-stop-timeout.conf
 /usr/sbin/qubes-serial-login
@@ -377,6 +378,7 @@ rm -f %{name}-%{version}
 /usr/lib/qubes/xdg-icon
 /usr/lib/qubes/update-proxy-configs
 /usr/lib/yum-plugins/yum-qubes-hooks.py*
+/usr/lib/python2.7/site-packages/dnf-plugins/qubes-hooks.py*
 /usr/lib/dracut/dracut.conf.d/30-qubes.conf
 /usr/lib64/python2.7/site-packages/qubes/xdg.py*
 /usr/sbin/qubes-firewall