Add 'guix-daemon.conf' job for Upstart.

* etc/guix-daemon.conf.in: New file.
* daemon.am (CLEANFILES): Add etc/guix-daemon.conf.
  (upstartjobdir, nodist_upstartjob_DATA): New variables.
  (EXTRA_DIST): Add etc/guix-daemon.conf.in.
* doc/guix.texi (Binary Installation, Build Environment Setup): Mention
  'guix-daemon.conf'.

Signed-off-by: Mario Daniel Ruiz Saavedra <desiderantes@rocketmail.com>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

.gitignore

@@ -125,6 +125,7 @@ GTAGS
 /doc/os-config-desktop.texi
 /doc/*.1
 /etc/guix-daemon.service
+/etc/guix-daemon.conf
 /doc/images/bootstrap-graph.pdf
 /doc/images/coreutils-bag-graph.png
 /doc/images/coreutils-graph.png

daemon.am

@@ -21,7 +21,7 @@
 #
 
 BUILT_SOURCES += nix/libstore/schema.sql.hh
-CLEANFILES += $(BUILT_SOURCES) etc/guix-daemon.service
+CLEANFILES += $(BUILT_SOURCES) etc/guix-daemon.service etc/guix-daemon.conf
 
 noinst_LIBRARIES = libformat.a libutil.a libstore.a
 
@@ -191,11 +191,23 @@ etc/guix-daemon.service: etc/guix-daemon.service.in	\
 	       "$(srcdir)/etc/guix-daemon.service.in" > "$@.tmp"
 	mv "$@.tmp" "$@"
 
+# The '.conf' job for Upstart.
+upstartjobdir = $(libdir)/upstart/system
+nodist_upstartjob_DATA = etc/guix-daemon.conf
+
+etc/guix-daemon.conf: etc/guix-daemon.conf.in	\
+			 $(top_builddir)/config.status
+	$(MKDIR_P) "`dirname "$@"`"
+	$(SED) -e 's|@''bindir''@|$(bindir)|' <				\
+	       "$(srcdir)/etc/guix-daemon.conf.in" > "$@.tmp"
+	mv "$@.tmp" "$@"
+
 EXTRA_DIST +=					\
   nix/libstore/schema.sql			\
   nix/AUTHORS					\
   nix/COPYING					\
-  etc/guix-daemon.service.in
+  etc/guix-daemon.service.in	\
+  etc/guix-daemon.conf.in
 
 AM_TESTS_ENVIRONMENT +=				\
   top_builddir="$(abs_top_builddir)"

doc/guix.texi

@@ -366,6 +366,10 @@ On hosts using the systemd init system, drop
 @file{~root/.guix-profile/lib/systemd/system/guix-daemon.service} in
 @file{/etc/systemd/system}.
 
+Likewise, on hosts using the Upstart init system, drop
+@file{~root/.guix-profile/lib/upstart/system/guix-daemon.conf} in
+@file{/etc/init}.
+
 @item
 Make the @command{guix} command available to other users on the machine,
 for instance with:
@@ -554,7 +558,10 @@ parallel, as specified by the @option{--max-jobs} option
 following command@footnote{If your machine uses the systemd init system,
 dropping the @file{@var{prefix}/lib/systemd/system/guix-daemon.service}
 file in @file{/etc/systemd/system} will ensure that
-@command{guix-daemon} is automatically started.}:
+@command{guix-daemon} is automatically started.  Similarly, if your
+machine uses the Upstart init system, drop the
+@file{@var{prefix}/lib/upstart/system/guix-daemon.conf}
+file in @file{/etc/init}.}:
 
 @example
 # guix-daemon --build-users-group=guixbuild

etc/guix-daemon.conf.in

@@ -0,0 +1,12 @@
+# This is a "job" for the Upstart init system to launch 'guix-daemon'.
+# Drop it in /etc/init to have 'guix-daemon' automatically started.
+
+description "Build daemon for GNU Guix"
+
+start on runlevel [2345]
+
+stop on runlevel [016]
+
+task
+
+exec @bindir@/guix-daemon --build-users-group=guixbuild