generator: Acquire lock to prevent two parallel runs of the generator.

[libguestfs.git] / daemon / guestfsd.c

diff --git a/daemon/guestfsd.c b/daemon/guestfsd.c
index 5789fed..9375ede 100644 (file)
--- a/daemon/guestfsd.c
+++ b/daemon/guestfsd.c
@@ -831,7 +831,7 @@ split_lines (char *str)
   int size = 0, alloc = 0;
   char *p, *pend;
 
-  if (strcmp (str, "") == 0)
+  if (STREQ (str, ""))
     goto empty_list;
 
   p = str;
@@ -976,5 +976,25 @@ device_name_translation (char *device, const char *func)
 void
 udev_settle (void)
 {
-  command (NULL, NULL, "/sbin/udevadm", "settle", NULL);
+  static int which_prog = 0;
+
+  if (which_prog == 0) {
+    if (access ("/sbin/udevsettle", X_OK) == 0)
+      which_prog = 2;
+    else if (access ("/sbin/udevadm", X_OK) == 0)
+      which_prog = 1;
+    else
+      which_prog = 3;
+  }
+
+  switch (which_prog) {
+  case 1:
+    command (NULL, NULL, "/sbin/udevadm", "settle", NULL);
+    break;
+  case 2:
+    command (NULL, NULL, "/sbin/udevsettle", NULL);
+    break;
+  default:
+    ;
+  }
 }