ntfs-3g_apply.c: add hint about known libntfs-3g bug

diff --git a/src/ntfs-3g_apply.c b/src/ntfs-3g_apply.c
index 0a3dcaca50f77d5b97b9b1cb743fd70e0cd3c3e6..07dbdf65094df0e05c865b202b455b5b2f3e18d0 100644 (file)
--- a/src/ntfs-3g_apply.c
+++ b/src/ntfs-3g_apply.c
@@ -30,6 +30,7 @@
 #  include "config.h"
 #endif
 
+#include <errno.h>
 #include <locale.h>
 #include <string.h>
 
@@ -415,15 +416,24 @@ ntfs_3g_set_metadata(ntfs_inode *ni, const struct wim_inode *inode,
                desc_size = sd->sizes[inode->i_security_id];
 
                ret = ntfs_3g_set_security_descriptor(ni, desc, desc_size);
-               if (ret) {
-                       if (wimlib_print_errors) {
-                               ERROR_WITH_ERRNO("Failed to set security descriptor "
-                                                "on \"%s\" in NTFS volume",
-                                                dentry_full_path(one_dentry));
+
+               if (unlikely(ret)) {
+                       int err = errno;
+                       ERROR_WITH_ERRNO("Failed to set security descriptor on "
+                                        "\"%s\" in NTFS volume",
+                                        dentry_full_path(one_dentry));
+                       if (err == EINVAL && wimlib_print_errors) {
                                fprintf(wimlib_error_file,
                                        "The security descriptor is: ");
                                print_byte_field(desc, desc_size, wimlib_error_file);
                                fprintf(wimlib_error_file, "\n");
+                               fprintf(wimlib_error_file,
+                                       "\nThis error occurred because libntfs-3g thinks "
+                                       "the security descriptor is invalid.  If you "
+                                       "are extracting a Windows 10 image, this may be "
+                                       "caused by a known bug in libntfs-3g.  See: "
+                                       "http://wimlib.net/forums/viewtopic.php?f=1&t=4 "
+                                       "for more information.\n\n");
                        }
                        return ret;
                }