pulseaudio: add pactl inside rootfs

Fixes QubesOS/qubes-issues#8975

rootfs/gen

@@ -66,6 +66,7 @@ if [[ -e "$PWD/build/qrexec/agent/qrexec-agent" ]]; then
 	export LD_LIBRARY_PATH="$PWD/build/padist/lib:$PWD/build/padist/lib/pulseaudio:$PWD/build/qrexec/libqrexec"
     fi
     inst build/padist/usr/local/bin/pulseaudio /bin/pulseaudio
+    inst build/padist/usr/local/bin/pactl /bin/pactl
     for mod in build/padist/lib/module-*.so; do
 	inst "$mod" "/lib/$(basename "$mod")"
     done
@@ -88,7 +89,7 @@ inst build/qrexec/agent/qrexec-agent /bin/qrexec-agent
 inst build/qrexec/agent/qrexec-client-vm /bin/qrexec-client-vm
 inst build/qrexec/agent/qrexec-fork-server /bin/qrexec-fork-server
 echo "root:x:0:0:root:/root:/bin/sh" > "$rootfs_dir"/etc/passwd
-echo "bus/usb/00[1-9]/00[2-9] 0:0 660 *sh /bin/qusb.sh" > "$rootfs_dir"/etc/mdev.conf 
+echo "bus/usb/00[1-9]/00[2-9] 0:0 660 *sh /bin/qusb.sh" > "$rootfs_dir"/etc/mdev.conf
 fi
 
 for i in write watch rm ls list; do
@@ -107,6 +108,12 @@ inst "rootfs/qemu-ifup" "/etc/qemu-ifup"
 inst "rootfs/qemu-ifdown" "/etc/qemu-ifdown"
 inst "rootfs/init" "/init"
 
+mkdir -p "$rootfs_dir"/etc/qubes-rpc
+inst "rootfs/qubes.SetAudioVM" /etc/qubes-rpc/qubes.SetAudioVM
+
+### Uncomment only for development
+#inst "rootfs/qubes.VMShell" /etc/qubes-rpc/qubes.VMShell
+
 mkdir "$rootfs_dir"/lib.new
 (find "$rootfs_dir"/{,usr/,usr/local/}lib{,64} -type f -print0 || true) | xargs -0r mv -t "$rootfs_dir"/lib.new/
 rm -rf "${rootfs_dir:?}"/{,usr/,usr/local/}lib{,64}

rootfs/init

@@ -21,15 +21,15 @@ vm_path=$(xenstore-read "/local/domain/$domid/vm")
 dm_args=$(xenstore-read $(xenstore-list -p "$vm_path/image/dm-argv"|sort))
 
 usb_args=
-if test -e /bin/qrexec-agent; then 
+if test -e /bin/qrexec-agent; then
     usb_args=$'-device\nnec-usb-xhci,id=xhci'
     mkdir -p /var/run/qubes
     USER=root qrexec-agent &
     touch /dev/mdev.log
     mdev -d
 fi
 
-# add audiodev conf to cmdline and run pulseaudio 
+# add audiodev conf to cmdline and run pulseaudio
 audio_model=$(echo "$dm_args" | sed -n '/^\(intel-hda\|ac97\|adlib\|es1370\|cs4231a\|gus\|sb16\)$/ {p}')
 if [ -n "$audio_model" ] ; then
     model_args=
@@ -40,6 +40,10 @@ if [ -n "$audio_model" ] ; then
     pa_args=$'-audiodev\npa,id=qemupa,server=unix:/tmp/pa.sock'$model_args;
     pulseaudio --use-pid-file=no --daemonize=no --exit-idle-time=-1 -n \
 	-L "module-native-protocol-unix auth-anonymous=1 socket=/tmp/pa.sock" \
+	-L "module-always-sink" \
+	-L "module-always-source" \
+	-L "module-null-sink" \
+	-L "module-null-source" \
 	-L "module-vchan-sink domid=0" &
 fi
 

rootfs/qubes.SetAudioVM

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -e
+
+# Default to dom0
+domid="${1:-0}"
+
+export PULSE_SERVER=unix:/tmp/pa.sock
+
+pactl unload-module module-vchan-sink
+pactl load-module module-vchan-sink domid="$domid"
+
+pactl set-default-sink vchan_output
+pactl set-default-source vchan_input

rootfs/qubes.VMShell

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec /bin/sh