hal: add stub module that loads module-udev-detect instead of module-hal-detect

This adds module-hal-detect-compat.c which when enabled will be compiled
into a module module-hal-detect which simply loads module-udev-detect.

The purpose of this is to allow easy upgrading without breaking
default.pa. Distributions are recommended to enable this to easy
upgrades from HAL versions of PA to udev versions.

configure.ac

@@ -1118,6 +1118,28 @@ AM_CONDITIONAL([HAVE_UDEV], [test "x$HAVE_UDEV" = x1])
 
 AC_DEFINE([LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE], 1, [I know the API is subject to change.])
 
+#### HAL compat support (optional) ####
+
+AC_ARG_ENABLE([hal-compat],
+    AS_HELP_STRING([--disable-hal-compat],[Disable optional HAL->udev transition compatibility support]),
+        [
+            case "${enableval}" in
+                yes) halcompat=yes ;;
+                no) halcompat=no ;;
+                *) AC_MSG_ERROR(bad value ${enableval} for --disable-hal-compat) ;;
+            esac
+        ],
+        [halcompat=auto])
+if test "x${halcompat}" != xno -a "x$HAVE_HAL" = "x0" -a "x$HAVE_UDEV" = "x1" ; then
+    HAVE_HAL_COMPAT=1
+    AC_DEFINE([HAVE_HAL_COMPAT], 1, [Have HAL compatibility.])
+else
+    HAVE_HAL_COMPAT=0
+fi
+
+AC_SUBST(HAVE_HAL_COMPAT)
+AM_CONDITIONAL([HAVE_HAL_COMPAT], [test "x$HAVE_HAL_COMPAT" = x1])
+
 #### BlueZ support (optional) ####
 
 AC_ARG_ENABLE([bluez],
@@ -1441,6 +1463,11 @@ if test "x$HAVE_UDEV" = "x1" ; then
    ENABLE_UDEV=yes
 fi
 
+ENABLE_HAL_COMPAT=no
+if test "x$HAVE_HAL_COMPAT" = "x1" ; then
+   ENABLE_HAL_COMPAT=yes
+fi
+
 ENABLE_TCPWRAP=no
 if test "x${LIBWRAP_LIBS}" != x ; then
    ENABLE_TCPWRAP=yes
@@ -1507,6 +1534,7 @@ echo "
     Enable LIRC:                   ${ENABLE_LIRC}
     Enable HAL:                    ${ENABLE_HAL}
     Enable udev:                   ${ENABLE_UDEV}
+    Enable HAL->udev compat:       ${ENABLE_HAL_COMPAT}
     Enable BlueZ:                  ${ENABLE_BLUEZ}
     Enable TCP Wrappers:           ${ENABLE_TCPWRAP}
     Enable libsamplerate:          ${ENABLE_LIBSAMPLERATE}

src/Makefile.am

@@ -1120,6 +1120,11 @@ modlibexec_LTLIBRARIES += \
 		module-hal-detect.la
 endif
 
+if HAVE_HAL_COMPAT
+modlibexec_LTLIBRARIES += \
+		module-hal-detect.la
+endif
+
 if HAVE_UDEV
 modlibexec_LTLIBRARIES += \
 		module-udev-detect.la
@@ -1576,10 +1581,16 @@ module_jack_source_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_jack_source_la_LIBADD = $(AM_LIBADD) libpulsecore-@PA_MAJORMINORMICRO@.la $(JACK_LIBS) libpulsecommon-@PA_MAJORMINORMICRO@.la libpulse.la
 module_jack_source_la_CFLAGS = $(AM_CFLAGS) $(JACK_CFLAGS)
 
+if HAVE_HAL_COMPAT
+module_hal_detect_la_SOURCES = modules/module-hal-detect-compat.c
+module_hal_detect_la_LIBADD = $(AM_LIBADD) libpulsecore-@PA_MAJORMINORMICRO@.la libpulsecommon-@PA_MAJORMINORMICRO@.la libpulse.la
+module_hal_detect_la_CFLAGS = $(AM_CFLAGS)
+else
 module_hal_detect_la_SOURCES = modules/module-hal-detect.c
-module_hal_detect_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_hal_detect_la_LIBADD = $(AM_LIBADD) $(HAL_LIBS) libpulsecore-@PA_MAJORMINORMICRO@.la libpulsecommon-@PA_MAJORMINORMICRO@.la libpulse.la
 module_hal_detect_la_CFLAGS = $(AM_CFLAGS) $(HAL_CFLAGS)
+endif
+module_hal_detect_la_LDFLAGS = $(MODULE_LDFLAGS)
 
 module_udev_detect_la_SOURCES = modules/module-udev-detect.c
 module_udev_detect_la_LDFLAGS = $(MODULE_LDFLAGS)

src/modules/module-hal-detect-compat.c

@@ -0,0 +1,84 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2009 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/module.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/core-util.h>
+
+#include "module-hal-detect-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("Compatibility module");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(TRUE);
+PA_MODULE_DEPRECATED("Please use module-udev-detect instead of module-hal-detect!");
+
+static const char* const valid_modargs[] = {
+    "api",
+    "tsched",
+    "subdevices",
+    NULL,
+};
+
+int pa__init(pa_module*m) {
+    pa_modargs *ma = NULL;
+    pa_bool_t tsched = TRUE;
+    pa_module *n;
+    char *t;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments");
+        goto fail;
+    }
+
+    if (pa_modargs_get_value_boolean(ma, "tsched", &tsched) < 0) {
+        pa_log("tsched= expects boolean arguments");
+        goto fail;
+    }
+
+    pa_log_warn("We will now load module-udev-detect. Please make sure to remove module-hal-detect from your configuration.");
+
+    t = pa_sprintf_malloc("tsched=%s", pa_yes_no(tsched));
+    n = pa_module_load(m->core, "module-udev-detect", t);
+    pa_xfree(t);
+
+    if (n)
+        pa_module_unload_request(m, TRUE);
+
+    pa_modargs_free(ma);
+
+    return n ? 0 : -1;
+
+fail:
+    if (ma)
+        pa_modargs_free(ma);
+
+    return -1;
+}