pulse: replace dbus control with QubesDB + local socket

Since pacat-simple-vchan not necessary run in dom0 anymore, it needs
some better control mechanism than dbus, to be cross-domain compatible.
Use QubesDB for notification of the audio-input state. But use local
socket + qrexec service (coming in the next commit) for changing the
state, as it gives immediate feedback if it was received by
pacat-simple-vchan.

QubesOS/qubes-issues#4547

Makefile

@@ -52,8 +52,6 @@ install:
 	install -D gui-daemon/qubes-guid $(DESTDIR)/usr/bin/qubes-guid
 	install -m 0644 -D gui-daemon/qubes-guid.1 $(DESTDIR)$(MANDIR)/man1/qubes-guid.1
 	install -D pulse/pacat-simple-vchan $(DESTDIR)/usr/bin/pacat-simple-vchan
-	install -D -m 0644 pulse/pacat-control-api.xml $(DESTDIR)/usr/share/dbus-1/interfaces/org.qubesos.Audio.xml
-	install -D -m 0644 pulse/org.qubesos.Audio.conf $(DESTDIR)/etc/dbus-1/system.d/org.qubesos.Audio.conf
 	install -D shmoverride/X-wrapper-qubes $(DESTDIR)/usr/bin/X-wrapper-qubes
 	install -D shmoverride/shmoverride.so $(DESTDIR)$(LIBDIR)/qubes-gui-daemon/shmoverride.so
 	install -D -m 0644 gui-daemon/guid.conf $(DESTDIR)/etc/qubes/guid.conf

debian/control

@@ -16,7 +16,7 @@ Build-Depends:
  libconfig-dev,
  libpng-dev,
  libnotify-dev,
- libdbus-glib-1-dev,
+ qubesdb-dev,
  help2man
 Standards-Version: 4.1.3
 Homepage: https://qubes-os.org/

debian/qubes-gui-daemon-pulseaudio.install

@@ -1,3 +1 @@
 usr/bin/pacat-simple-vchan
-usr/share/dbus-1/interfaces/org.qubesos.Audio.xml
-etc/dbus-1/system.d/org.qubesos.Audio.conf

pulse/Makefile

@@ -2,19 +2,13 @@ CC=gcc
 CFLAGS=-Wall -Wextra -Werror -g -O2
 VCHANLIBS=`pkg-config --libs vchan-$(BACKEND_VMM)`
 VCHANCFLAGS=`pkg-config --cflags vchan-$(BACKEND_VMM)`
-GLIBCFLAGS=`pkg-config --cflags glib-2.0` `pkg-config --cflags dbus-glib-1`
-GLIBLIBS=`pkg-config --libs glib-2.0` `pkg-config --libs dbus-glib-1` `pkg-config --libs gthread-2.0`
+GLIBCFLAGS=`pkg-config --cflags glib-2.0`
+GLIBLIBS=`pkg-config --libs glib-2.0`
 all: module-vchan-sink.so pacat-simple-vchan
 pacat-simple-vchan.o: pacat-simple-vchan.c
 	$(CC) $(CFLAGS) -c $(VCHANCFLAGS) -I. $(GLIBCFLAGS) pacat-simple-vchan.c
-pacat-control-object.o: pacat-control-object.c pacat-control-object.h pacat-control-stub.h
-	$(CC) $(CFLAGS) -c $(VCHANCFLAGS) -I. $(GLIBCFLAGS) $<
-pacat-simple-vchan: pacat-simple-vchan.o pacat-control-object.o
+pacat-simple-vchan: pacat-simple-vchan.o
 	$(CC) -o pacat-simple-vchan $^ \
-		$(VCHANLIBS) -lpulse -lpulse-mainloop-glib $(GLIBLIBS)
-# Do not autogenerate because dbus-binding-tool from dbus-glib-0.86 (in chroot)
-# produces output incompatible with dbus-glib-0.84 (in Qubes dom0).
-#pacat-control-stub.h: pacat-control-api.xml
-#	dbus-binding-tool --mode=glib-server --prefix=pacat-control $< > $@
+		$(VCHANLIBS) -lpulse -lpulse-mainloop-glib -lqubesdb $(GLIBLIBS)
 clean:
 	rm -f *.so *.o pacat-simple-vchan *~