1 files changed, 67 insertions, 0 deletions
diff --git a/daemon/hotplug.c b/daemon/hotplug.c
new file mode 100644
index 00000000..aae638e7
--- /dev/null
+++ b/daemon/hotplug.c
@@ -0,0 +1,67 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2012 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <time.h>
+
+#include "guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+#define HOT_ADD_TIMEOUT 30 /* seconds */
+
+/* Wait for /dev/disk/guestfs/<label> to appear.  Timeout (and error)
+ * if it doesn't appear after a reasonable length of time.
+ */
+int
+do_internal_hot_add_drive (const char *label)
+{
+  time_t start_t, now_t;
+  size_t len = strlen (label);
+  char path[len+64];
+  int r;
+
+  snprintf (path, len+64, "/dev/disk/guestfs/%s", label);
+
+  time (&start_t);
+
+  while (time (&now_t) - start_t <= HOT_ADD_TIMEOUT) {
+    udev_settle ();
+
+    r = access (path, F_OK);
+    if (r == -1 && errno != ENOENT) {
+      reply_with_perror ("%s", path);
+      return -1;
+    }
+    if (r == 0)
+      return 0;
+
+    sleep (1);
+  }
+
+  reply_with_error ("hot-add drive: '%s' did not appear after %d seconds: "
+                    "this could mean that virtio-scsi (in qemu or kernel) "
+                    "or udev is not working",
+                    path, HOT_ADD_TIMEOUT);
+  return -1;
+}