daemon: Install dring to libexec and edit templates at install time.

Executables are typically installed under bin/, sbin/ or libexec,
rather than lib/.  The problem was noticed when trying to use Jami
with a Guix relocatable pack, which only wraps executables found under
the above locations.  Since dring is a daemon and should not be run
directly by users under normal circumstances, the convention is to use
the libexec directory, according to the File Hierchy Standard 3.0.

Also tackled in this change is the substitution of the Autoconf
variables at installation time rather than configuration time, as per
the GNU Coding Standards.  The following solution is taken from
https://github.com/gentoo/eudev/pull/183/commits, which in turn is
adapted from the Autoconf manual (c.f.: info "(autoconf)Installation
Directory Variables").

* bin/Makefile.am (ringlibdir): Delete variable.
* bin/dbus/Makefile.am (do_subst): New variable.
(cx.ring.Ring.service): Derive from the cx.ring.Ring.service.in
template.
[HAVE_WIN32]: (ringlib_PROGRAMS): Rename to ...
(bin_PROGRAMS): ... this.
[HAVE_OSX, RING_DBUS]: Likewise.
* bin/dbus/cx.ring.Ring.service.in (Exec): Adust.
* globals.mk (ringlibdir): Delete variable.
* configure.ac [with_dbus] <AC_CONFIG_FILES>: Remove
bin/dbus/cx.ring.Ring.service.  Also remove the LIBDIR variable, no
longer used.  Fix indentation.

Thanks to Vladimir Stoiakin for providing feedback on this change.

Change-Id: I845bf2bd590a9457e70ca173027217b8f164d713

bin/Makefile.am

-ringlibdir = $(libdir)/ring
-
 if HAVE_WIN32
-ringlib_PROGRAMS = ringcli
+libexec_PROGRAMS = ringcli
 ringcli_SOURCES = winmain.cpp
 ringcli_CXXFLAGS = -I$(top_srcdir)/src \
                    -I$(top_srcdir)/src/dring \
@@ -11,7 +9,7 @@ ringcli_LDADD = $(top_builddir)/src/libring.la
 endif
 
 if HAVE_OSX
-ringlib_PROGRAMS = ringcli
+libexec_PROGRAMS = ringcli
 ringcli_SOURCES = osxmain.cpp
 ringcli_CXXFLAGS = -I$(top_srcdir)/src \
                    -I$(top_srcdir)/src/dring \
@@ -25,7 +23,7 @@ SUBDIRS=
 if RING_DBUS
 SUBDIRS+=dbus
 
-ringlib_PROGRAMS = dring
+libexec_PROGRAMS = dring
 
 dring_SOURCES = main.cpp
 

bin/dbus/Makefile.am

@@ -65,6 +65,12 @@ libclient_dbus_la_CXXFLAGS = -I../ \
             -DPROGSHAREDIR=\"${datadir}/ring\" \
             $(DBUSCPP_CFLAGS)
 
+do_subst = $(SED) \
+	-e 's,[@]bindir[@],$(bindir),g'
+
+cx.ring.Ring.service: cx.ring.Ring.service.in Makefile
+	$(do_subst) < $< > $@
+
 # Dbus service file
 servicedir = $(datadir)/dbus-1/services
 service_DATA = cx.ring.Ring.service

bin/dbus/cx.ring.Ring.service.in

 [D-BUS Service]
 Name=cx.ring.Ring
-Exec=@LIBDIR@/ring/dring
+Exec=@libexec@/dring

configure.ac

@@ -381,15 +381,11 @@ AC_ARG_WITH([dbus],
   [AS_HELP_STRING([--without-dbus], [disable support for dbus])],
   [],
   [with_dbus=yes])
-AS_IF([test "x$with_dbus" = "xyes"], [
-  PKG_CHECK_MODULES(DBUSCPP, dbus-c++-1,,
+AS_IF([test "x$with_dbus" = "xyes"],
+  [PKG_CHECK_MODULES(DBUSCPP, dbus-c++-1,,
      AC_MSG_WARN([Missing dbus development files]))
 
-  AS_AC_EXPAND(LIBDIR, $libdir)
-  AC_SUBST(LIBDIR)
-
-  AC_CONFIG_FILES([bin/dbus/Makefile
-                   bin/dbus/cx.ring.Ring.service])
+   AC_CONFIG_FILES([bin/dbus/Makefile])
 
    AC_PATH_PROG([DBUSXX_XML2CPP], dbusxx-xml2cpp,
      [AC_MSG_ERROR([dbusxx-xml2cpp not found])])
@@ -397,8 +393,9 @@ AS_IF([test "x$with_dbus" = "xyes"], [
    AS_IF([test "x$CLANG" = "xyes"],
      [AC_MSG_ERROR([dbus does not compile when clang is used,
                     rerun with --without-dbus])]);
-  AM_CONDITIONAL(RING_DBUS, true)],TESTS= $(check_PROGRAMS)
-  AM_CONDITIONAL(RING_DBUS, false));
+   AM_CONDITIONAL(RING_DBUS, true)],
+  [TESTS= $(check_PROGRAMS)
+   AM_CONDITIONAL(RING_DBUS, false)]);
 
 dnl name service is default-enabled
 AC_ARG_ENABLE([ringns], AS_HELP_STRING([--disable-ringns],

globals.mk

 # Global variables
 
 src=$(abs_top_srcdir)
-ringlibdir=$(DESTDIR)$(libdir)/ring
 
 ASTYLERC="$(top_srcdir)/../astylerc"
 indent="/usr/bin/astyle"