Document wimlib_update_image()

[wimlib] / src / metadata_resource.c

diff --git a/src/metadata_resource.c b/src/metadata_resource.c
index 3e8b7283e17f3267fb5d660df3db0412e41c9150..2f7dfeb6e729ce0ae3dd4c0f7a59ca05f9f96e49 100644 (file)
--- a/src/metadata_resource.c
+++ b/src/metadata_resource.c
@@ -225,6 +225,7 @@ write_metadata_resource(WIMStruct *w)
        struct wim_lookup_table_entry *lte;
        u64 metadata_original_size;
        struct wim_security_data *sd;
+       struct wim_image_metadata *imd;
 
        wimlib_assert(w->out_fd != -1);
        wimlib_assert(w->current_image != WIMLIB_NO_IMAGE);
@@ -232,9 +233,18 @@ write_metadata_resource(WIMStruct *w)
        DEBUG("Writing metadata resource for image %d (offset = %"PRIu64")",
              w->current_image, filedes_offset(w->out_fd));
 
+       imd = w->image_metadata[w->current_image - 1];
 
-       root = wim_root_dentry(w);
-       sd = wim_security_data(w);
+       root = imd->root_dentry;
+       sd = imd->security_data;
+
+       if (!root) {
+               /* Empty image; create a dummy root. */
+               ret = new_filler_directory(T(""), &root);
+               if (ret)
+                       return ret;
+               imd->root_dentry = root;
+       }
 
        /* Offset of first child of the root dentry.  It's equal to:
         * - The total length of the security data, rounded to the next 8-byte