build: Option to disable the backend build

With xdg-app, we will want to bundle the client convenience library with
applications that require GeoClue, without having them ship all the
backend service files, which will be shipped in the core OS.

Introduce a --disable-backend build option that implements this policy.

https://bugs.freedesktop.org/show_bug.cgi?id=93889

3 files changed, 35 insertions, 15 deletions

diff --git a/Makefile.am b/Makefile.am
index c620e09..6270104 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -7,7 +7,13 @@ else
 LIBGEOCLUE_DIR =
 endif
 
-SUBDIRS = build-aux public-api src data $(LIBGEOCLUE_DIR) demo po docs
+if BUILD_BACKEND
+BACKEND_DIR = src
+else
+BACKEND_DIR =
+endif
+
+SUBDIRS = build-aux public-api $(BACKEND_DIR) data $(LIBGEOCLUE_DIR) demo po docs
 
 INTLTOOL_FILES =				\
 	intltool-extract.in			\
diff --git a/configure.ac b/configure.ac
index 6d13ba4..67c3100 100644
--- a/configure.ac
+++ b/configure.ac
@@ -125,11 +125,6 @@ if test "x$build_modem_source" = "xyes"; then
 fi
 AM_CONDITIONAL([BUILD_MODEM_SOURCE], [test "x$build_modem_source" = "xyes"])
 
-# Check for ModemManager if one of the sources requires it
-if test "x$require_modemmanager" = "xyes"; then
-  PKG_CHECK_MODULES(ModemManager, mm-glib >= $LIBMM_GLIB_MIN_VERSION)
-fi
-
 # Network NMEA Source
 AC_ARG_ENABLE(nmea-source,
               AS_HELP_STRING([--disable-nmea-source],
@@ -143,12 +138,28 @@ else
 fi
 AM_CONDITIONAL([BUILD_NMEA_SOURCE], [test "x$build_nmea_source" = "xyes"])
 
-if test "x$build_nmea_source" = "xyes"; then
-    # Check for avahi-client and avahi-glib
-    PKG_CHECK_MODULES(NMEA_SOURCE, [
-                      avahi-client >= $AVAHI_MIN_VERSION
-                      avahi-glib >= $AVAHI_MIN_VERSION])
+# Backend build
+AC_ARG_ENABLE(backend,
+              AS_HELP_STRING([--disable-backend], [Disable backend]),
+              [build_backend=$enableval], [build_backend=yes])
+
+if test "x$build_backend" = "xyes"; then
+  # Check for ModemManager if one of the sources requires it
+  if test "x$require_modemmanager" = "xyes"; then
+    PKG_CHECK_MODULES(ModemManager, mm-glib >= $LIBMM_GLIB_MIN_VERSION)
+  fi
+
+  if test "x$build_nmea_source" = "xyes"; then
+      # Check for avahi-client and avahi-glib
+      PKG_CHECK_MODULES(NMEA_SOURCE, [
+                        avahi-client >= $AVAHI_MIN_VERSION
+                        avahi-glib >= $AVAHI_MIN_VERSION])
+  fi
+  AC_DEFINE([BUILD_BACKEND], [1], [Build backend?])
+else
+  AC_DEFINE([BUILD_BACKEND], [0], [Build backend?])
 fi
+AM_CONDITIONAL([BUILD_BACKEND], [test "x$build_backend" = "xyes"])
 
 # Demo agent
 AC_ARG_ENABLE(demo-agent,
@@ -253,6 +264,7 @@ AC_MSG_NOTICE([
         c compiler:               ${CC} ${CFLAGS}
         systemdsystemunitdir:     ${systemdsystemunitdir}
 
+        Backend:                  ${build_backend}
         Convenience library:      ${build_libgeoclue}
         Introspection:            ${build_introspection}
         3G source:                ${build_3g_source}
diff --git a/data/Makefile.am b/data/Makefile.am
index 38a1e56..fc837d0 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -1,5 +1,9 @@
-systemconfdir    = $(sysconfdir)/geoclue
+service_in_files = org.freedesktop.GeoClue2.service.in
 systemconf_in_files = geoclue.conf.in
+systemdservice_in_files = geoclue.service.in
+
+if BUILD_BACKEND
+systemconfdir    = $(sysconfdir)/geoclue
 systemconf_DATA = $(systemconf_in_files:.conf.in=.conf)
 
 if BUILD_DEMO_AGENT
@@ -13,7 +17,6 @@ $(systemconf_DATA): $(systemconf_in_files) Makefile
 endif
 
 servicedir       = $(datadir)/dbus-1/system-services
-service_in_files = org.freedesktop.GeoClue2.service.in
 service_DATA     = $(service_in_files:.service.in=.service)
 
 $(service_DATA): $(service_in_files) Makefile
@@ -25,8 +28,6 @@ dbusservicedir = $(DBUS_SYS_DIR)
 dbusservice_DATA = org.freedesktop.GeoClue2.conf \
 		   org.freedesktop.GeoClue2.Agent.conf
 
-systemdservice_in_files = geoclue.service.in
-
 if HAVE_SYSTEMD
 systemdservicedir       = $(systemdsystemunitdir)
 systemdservice_DATA     = $(systemdservice_in_files:.service.in=.service)
@@ -35,6 +36,7 @@ $(systemdservice_DATA): $(systemdservice_in_files) Makefile
 	@sed -e "s|\@libexecdir\@|$(libexecdir)|" $< | \
 	sed -e "s|\@dbus_srv_user\@|$(dbus_srv_user)|" > $@
 endif
+endif
 
 DISTCLEANFILES = $(service_DATA) \
                  $(systemconf_DATA) \