build: add configure option to control vfs_snapper build

vfs_snapper is currently built if dbus development headers / libraries
are detected during configure. This commit adds new --disable-snapper
and --enable-snapper (default) configure parameters. When enabled,
configure will fail if the dbus development headers / libraries are
missing.

Signed-off-by: Matt Taylor <liverbugg@rinux.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Mon May 25 01:16:46 UTC 2020 on sn-devel-184

diff --git a/source3/wscript b/source3/wscript
index 07991806c635fce0fae460a9234affc47384b745..24ade3b0a2b6e9f123b5ab223130e77e8f21fa34 100644 (file)
--- a/source3/wscript
+++ b/source3/wscript
@@ -74,6 +74,7 @@ def options(opt):
 
     opt.samba_add_onoff_option('glusterfs', with_name="enable", without_name="disable", default=True)
     opt.samba_add_onoff_option('cephfs', with_name="enable", without_name="disable", default=True)
+    opt.samba_add_onoff_option('snapper', with_name="enable", without_name="disable", default=True)
 
     opt.add_option('--enable-vxfs',
                   help=("enable support for VxFS (default=no)"),
@@ -1752,11 +1753,16 @@ main() {
     if Options.options.enable_vxfs:
         conf.DEFINE('HAVE_VXFS', '1')
 
-    if conf.CHECK_CFG(package='dbus-1', args='--cflags --libs',
+    if Options.options.with_snapper:
+        if conf.CHECK_CFG(package='dbus-1', args='--cflags --libs',
                       msg='Checking for dbus', uselib_store="DBUS-1"):
-        if (conf.CHECK_HEADERS('dbus/dbus.h', lib='dbus-1')
+            if (conf.CHECK_HEADERS('dbus/dbus.h', lib='dbus-1')
                                       and conf.CHECK_LIB('dbus-1', shlib=True)):
-            conf.DEFINE('HAVE_DBUS', '1')
+                conf.DEFINE('HAVE_DBUS', '1')
+        else:
+            conf.fatal("vfs_snapper is enabled but prerequisite DBUS libraries "
+                       "or headers not found. Use --disable-snapper to disable "
+                       "vfs_snapper support.");
 
     if conf.CHECK_CFG(package='liburing', args='--cflags --libs',
                       msg='Checking for liburing package', uselib_store="URING"):