add systemd integration

Add --with-systemd / --without-systemd options to check whether
libsystemd-daemon library is available and use it to report service
startup status to systemd for smbd/winbindd/nmbd and AD DC.

The problem it solves is correct reporting of the Samba services
at the point when they are ready to serve clients, important for
high availability software integration.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=10517

Signed-off-by: Alexander Bokovoy <ab@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

1 files changed, 23 insertions, 3 deletions

diff --git a/wscript b/wscript
index ae4ff50b6d1..87541da62ce 100644
--- a/wscript
+++ b/wscript
@@ -69,8 +69,15 @@ def set_options(opt):
                   help=("Disable RELRO builds"),
                   action="store_false", dest='enable_relro')
 
-    gr = opt.option_group('developer options')
+    opt.add_option('--with-systemd',
+                   help=("Enable systemd integration"),
+                   action='store_true', dest='enable_systemd')
+
+    opt.add_option('--without-systemd',
+                   help=("Disable systemd integration"),
+                   action='store_false', dest='enable_systemd')
 
+    gr = opt.option_group('developer options')
 
     opt.tool_options('python') # options for disabling pyc or pyo compilation
     # enable options related to building python extensions
@@ -169,8 +176,6 @@ def configure(conf):
                            addmain=False,
                            msg='Checking configure summary'):
         raise Utils.WafError('configure summary failed')
-    
-    conf.SAMBA_CONFIG_H('include/config.h')
 
     if Options.options.enable_pie != False:
         if Options.options.enable_pie == True:
@@ -192,6 +197,21 @@ def configure(conf):
                          msg="Checking compiler for full RELRO support"):
             conf.env['ENABLE_RELRO'] = True
 
+    if Options.options.enable_systemd != False:
+        conf.check_cfg(package='libsystemd-daemon', args='--cflags --libs',
+                       msg='Checking for libsystemd-daemon', uselib_store="SYSTEMD-DAEMON")
+        conf.CHECK_HEADERS('systemd/sd-daemon.h', lib='systemd-daemon')
+        conf.CHECK_LIB('systemd-daemon', shlib=True)
+
+    if conf.CONFIG_SET('HAVE_SYSTEMD_SD_DAEMON_H'):
+        conf.DEFINE('HAVE_SYSTEMD', '1')
+        conf.env['ENABLE_SYSTEMD'] = True
+    else:
+        conf.SET_TARGET_TYPE('systemd-daemon', 'EMPTY')
+        conf.undefine('HAVE_SYSTEMD')
+
+    conf.SAMBA_CONFIG_H('include/config.h')
+
 def etags(ctx):
     '''build TAGS file using etags'''
     import Utils