availability: Add optional groups and implement guestfs_available call.

[libguestfs.git] / daemon / zerofree.c

diff --git a/daemon/zerofree.c b/daemon/zerofree.c
index ffb9b70..05a547b 100644 (file)
--- a/daemon/zerofree.c
+++ b/daemon/zerofree.c
@@ -26,6 +26,14 @@
 
 #include "daemon.h"
 #include "actions.h"
+#include "optgroups.h"
+
+int
+optgroup_zerofree_available (void)
+{
+  int r = access ("/usr/sbin/zerofree", X_OK);
+  return r == 0;
+}
 
 int
 do_zerofree (const char *device)