launch: don't add a drive twice

[libguestfs.git] / src / launch.c

diff --git a/src/launch.c b/src/launch.c
index ca89b63..8a64b5e 100644 (file)
--- a/src/launch.c
+++ b/src/launch.c
@@ -285,6 +285,7 @@ guestfs__add_drive_opts (guestfs_h *g, const char *filename,
   char *format;
   char *iface;
   char *name;
+  char *abs_path = NULL;
   int use_cache_off;
 
   if (strchr (filename, ',') != NULL) {
@@ -304,18 +305,12 @@ guestfs__add_drive_opts (guestfs_h *g, const char *filename,
   if (format && !valid_format_iface (format)) {
     error (g, _("%s parameter is empty or contains disallowed characters"),
            "format");
-    free (format);
-    free (iface);
-    free (name);
-    return -1;
+    goto err_out;
   }
   if (!valid_format_iface (iface)) {
     error (g, _("%s parameter is empty or contains disallowed characters"),
            "iface");
-    free (format);
-    free (iface);
-    free (name);
-    return -1;
+    goto err_out;
   }
 
   /* For writable files, see if we can use cache=off.  This also
@@ -323,36 +318,44 @@ guestfs__add_drive_opts (guestfs_h *g, const char *filename,
    * to do the check explicitly.
    */
   use_cache_off = readonly ? 0 : test_cache_off (g, filename);
-  if (use_cache_off == -1) {
-    free (format);
-    free (iface);
-    free (name);
-    return -1;
-  }
+  if (use_cache_off == -1)
+    goto err_out;
 
   if (readonly) {
     if (access (filename, R_OK) == -1) {
       perrorf (g, "%s", filename);
-      free (format);
-      free (iface);
-      free (name);
-      return -1;
+      goto err_out;
     }
   }
 
+  abs_path = realpath (filename, NULL);
   struct drive **i = &(g->drives);
-  while (*i != NULL) i = &((*i)->next);
+  while (*i != NULL) {
+    if (STREQ((*i)->path, abs_path)) {
+      error (g, _("drive %s can't be added twice"), abs_path);
+      goto err_out;
+    }
+    i = &((*i)->next);
+  }
 
   *i = safe_malloc (g, sizeof (struct drive));
   (*i)->next = NULL;
-  (*i)->path = safe_strdup (g, filename);
+  (*i)->path = safe_strdup (g, abs_path);
   (*i)->readonly = readonly;
   (*i)->format = format;
   (*i)->iface = iface;
   (*i)->name = name;
   (*i)->use_cache_off = use_cache_off;
 
+  free (abs_path);
   return 0;
+
+err_out:
+  free (format);
+  free (iface);
+  free (name);
+  free (abs_path);
+  return -1;
 }
 
 int