daemon: Call udev-settle at the start of the daemon.

1 files changed, 11 insertions, 0 deletions

diff --git a/daemon/guestfsd.c b/daemon/guestfsd.c
index 487662f2..5c848497 100644
--- a/daemon/guestfsd.c
+++ b/daemon/guestfsd.c
@@ -269,6 +269,17 @@ main (int argc, char *argv[])
     exit (EXIT_FAILURE);
   }
 
+  /* Wait for udev devices to be created.  If you start libguestfs,
+   * especially with disks that contain complex (eg. mdadm) data
+   * already, then it is possible for the 'mdadm' and LVM commands
+   * that the init script runs to have not completed by the time the
+   * daemon starts executing library commands.  (This is very rare and
+   * hard to test however, but we have seen it in 'brew').  Run
+   * udev_settle, but do it as late as possible to minimize the chance
+   * that we'll have to do any waiting here.
+   */
+  udev_settle ();
+
   /* Send the magic length message which indicates that
    * userspace is up inside the guest.
    */