vmupdate: help with migrating from pulseaudio to pipewire-pulse

Pacman refuses this migration with non-interactive update. Help it a bit
by removing pulseaudio beforehand.

QubesOS/qubes-gui-agent-linux#224
QubesOS/qubes-issues#9660

vmupdate/agent/source/plugins/pipewire_archlinux.py

@@ -0,0 +1,47 @@
+#
+# The Qubes OS Project, https://www.qubes-os.org/
+#
+# Copyright (C) 2025 Marek Marczykowski-Górecki
+#                           <[email protected]>
+#
+# This library 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 library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU General Public
+# License along with this library; if not, see <https://www.gnu.org/licenses/>.
+
+import subprocess
+
+def pipewire_archlinux(os_data, log, **kwargs):
+    """Help with unattended switch from pulseaudio to pipewire-pulse"""
+    # pacman proposes to remove pulseaudio when installing pipewire-pulse,
+    # but the default answer is "n", so the update with --noconfirm fails
+    # workaround it by removing pulseaudio before the update
+    if os_data["os_family"] != 'ArchLinux':
+        return
+    # check if pulseaudio is installed
+    p = subprocess.call(["pacman", "-Q", "pulseaudio"],
+        stderr=subprocess.DEVNULL,
+        stdout=subprocess.DEVNULL,
+    )
+    if p != 0:
+        return
+    # ... and whether pipewire-pulse is going to be installed in the update
+    # this will refresh metadata already, before starting progress reporting,
+    # but well...
+    update_list = subprocess.check_output(["pacman", "-Syup"],
+        stderr=subprocess.DEVNULL).decode()
+    if not any("/pipewire-pulse-" in line for line in update_list.splitlines()):
+        return
+    # ... then remove pulseaudio beforehand (temporarily breaking the
+    # dependencies)
+    log.info("Removing pulseaudio to allow update cleanly migrate to "
+             "pipewire-pulse")
+    subprocess.check_call(["pacman", "-Rdd", "--noconfirm", "pulseaudio"])