Add 'guix-daemon.service' file for systemd.

* etc/guix-daemon.service.in: New file, provided by Ricardo Wurmus.
* daemon.am (CLEANFILES): Add etc/guix-daemon.service.
  (systemdservicedir, nodist_systemdservice_DATA): New variables.
  (EXTRA_DIST): Add etc/guix-daemon.service.in.
* doc/guix.texi (Binary Installation, Build Environment Setup): Mention
  'guix-daemon.service'.

1 files changed, 10 insertions, 2 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 7d18c00cb2..e4662cbfe1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -330,6 +330,10 @@ Run the daemon:
 # ~root/.guix-profile/bin/guix-daemon --build-users-group=guixbuild
 @end example
 
+On hosts using the systemd init system, drop
+@file{~root/.guix-profile/lib/systemd/system/guix-daemon.service} in
+@file{/etc/systemd/system}.
+
 @item
 Make the @command{guix} command available to other users on the machine,
 for instance with:
@@ -512,8 +516,12 @@ Bash syntax and the @code{shadow} commands):
 @noindent
 The number of build users determines how many build jobs may run in
 parallel, as specified by the @option{--max-jobs} option
-(@pxref{Invoking guix-daemon, @option{--max-jobs}}).
-The @code{guix-daemon} program may then be run as @code{root} with:
+(@pxref{Invoking guix-daemon, @option{--max-jobs}}).  The
+@code{guix-daemon} program may then be run as @code{root} with the
+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.}:
 
 @example
 # guix-daemon --build-users-group=guixbuild