Make systemd optional

There is not much of direct systemd usage in the system-info plugin.
This patch suggestion enables building this plugin on system like
alpine, voidlinux or gentoo with openrc.

Signed-off-by: Oz Tiram <[email protected]>

2 files changed, 25 insertions, 3 deletions

diff --git a/capplets/system-info/mate-system-info.c b/capplets/system-info/mate-system-info.c
index 36380678..180cdf3e 100644
--- a/capplets/system-info/mate-system-info.c
+++ b/capplets/system-info/mate-system-info.c
@@ -21,6 +21,7 @@
  *
  */
 #include <gtk/gtk.h>
+#include <glib.h>
 #include <glibtop/fsusage.h>
 #include <glibtop/mountlist.h>
 #include <glibtop/mem.h>
@@ -159,6 +160,7 @@ mate_system_info_set_row (MateSystemInfo *info)
 static char *
 get_system_hostname (void)
 {
+# ifdef HAVE_SYSTEMD
     GDBusProxy         *hostnamed_proxy;
     g_autoptr(GVariant) variant = NULL;
     g_autoptr(GError)   error = NULL; 
@@ -206,6 +208,9 @@ get_system_hostname (void)
         g_object_unref (hostnamed_proxy);
         return g_variant_dup_string (variant, NULL);
     }
+# else
+    return g_strdup (g_get_host_name ());
+# endif
 }
 
 static char *
@@ -493,7 +498,9 @@ static struct {
     { "openvz", "OpenVZ" },
     { "lxc", "LXC" },
     { "lxc-libvirt", "LXC (libvirt)" },
-    { "systemd-nspawn", "systemd (nspawn)" }
+# ifdef HAVE_SYSTEMD
+    { "systemd-nspawn", "systemd (nspawn)" },
+# endif
 };
 
 static char *
@@ -666,7 +673,7 @@ mate_system_info_setup (MateSystemInfo *info)
     kernel_text = get_kernel_vesrion ();
     label = g_object_get_data (G_OBJECT (info->kernel_row), "labelvalue");
     set_lable_style (label, "gray", 12, kernel_text, FALSE);
-
+# ifdef HAVE_SYSTEMD
     virt_text = get_system_virt ();
     if (virt_text != NULL)
     {
@@ -674,6 +681,7 @@ mate_system_info_setup (MateSystemInfo *info)
         label = g_object_get_data (G_OBJECT (info->virtualization_row), "labelvalue");
         set_lable_style (label, "gray", 12, virt_text, FALSE);
     }
+# endif
     windowing_system_text = get_windowing_system ();
     label = g_object_get_data (G_OBJECT (info->windowing_system_row), "labelvalue");
     set_lable_style (label, "gray", 12, windowing_system_text, FALSE);
diff --git a/configure.ac b/configure.ac
index aa43d083..45d5365f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -121,7 +121,6 @@ PKG_CHECK_MODULES(TYPING, $GMODULE_ADD glib-2.0 >= $GLIB_REQUIRED gio-2.0 gtk+-3
 PKG_CHECK_MODULES(GIO, gio-2.0)
 PKG_CHECK_MODULES(GLIBTOP, libgtop-2.0)
 PKG_CHECK_MODULES(UDISKS, udisks2)
-PKG_CHECK_MODULES(SYSTEMD, systemd >= $SYSTEMD_REQUIRED)
 
 PKG_CHECK_MODULES([DCONF], [dconf >= 0.13.4])
 AC_SUBST(DCONF_CFLAGS)
@@ -168,6 +167,20 @@ AC_ARG_ENABLE([libappindicator],
                                                   [enable_appindicator=yes],
                                                   [enable_appindicator=no])])])
 
+AC_ARG_ENABLE([systemd],
+              [AS_HELP_STRING([--enable-systemd[=@<:@no/auto/yes@:>@]],[Use systemd @<:@default=yes@:>@])],
+              [enable_systemd=$enableval],
+              [PKG_CHECK_EXISTS([$SYSTEMD >= $SYSTEMD_REQUIRED],
+                                [enable_systemd=no],
+                                ,
+                                )])
+
+AS_IF([test "x$enable_systemd" = xyes],
+      [AC_MSG_NOTICE([Building with systemd support.])
+       PKG_CHECK_MODULES([SYSTEMD],
+                         [systemd >= $SYSTEMD_REQUIRED],
+                         [AC_DEFINE(HAVE_SYSTEMD, 1, [Have systemd])])])
+
 AS_IF([test "x$enable_appindicator" = xyes],
       [AC_MSG_NOTICE([Buidling against Ubuntu AppIndicator.])
        PKG_CHECK_MODULES([APPINDICATOR],
@@ -313,6 +326,7 @@ Configure summary:
 
         Ayatana AppIndicator (preferred)   $(test "x$enable_appindicator" = xyes && echo no || echo yes)
         Ubuntu AppIndicator (legacy)       $(test "x$enable_appindicator" = xyes && echo yes || echo no)
+	Systemd:                           $(test "x$enable_systemd" = xyes && echo yes || echo no)
 
         Accountsservice:           ${have_accountsservice}
         Native Language support:   ${USE_NLS}