extract.c: recommend --unix-data mode when appropriate

[wimlib] / src / extract.c

diff --git a/src/extract.c b/src/extract.c
index b59e22352f81f6078e8fc224a4df322817b12628..f59cffb55347acc014da0feb0aad58f42d2150b8 100644 (file)
--- a/src/extract.c
+++ b/src/extract.c
@@ -6,7 +6,7 @@
  */
 
 /*
- * Copyright (C) 2012-2016 Eric Biggers
+ * Copyright (C) 2012-2017 Eric Biggers
  *
  * This file is free software; you can redistribute it and/or modify it under
  * the terms of the GNU Lesser General Public License as published by the Free
@@ -1365,18 +1365,19 @@ do_feature_check(const struct wim_features *required_features,
                        required_features->security_descriptors);
 
        /* Standard UNIX metadata */
-       if ((extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) &&
-           required_features->unix_data && !supported_features->unix_data)
-       {
-               ERROR("Requested UNIX metadata extraction, but extraction "
-                     "backend does not support it!");
-               return WIMLIB_ERR_UNSUPPORTED;
-       }
        if (required_features->unix_data &&
-           !(extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA))
+           (!supported_features->unix_data ||
+            !(extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA)))
        {
-               WARNING("Ignoring UNIX metadata (uid/gid/mode/rdev) of %lu files",
-                       required_features->unix_data);
+               if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
+                       ERROR("Requested UNIX metadata extraction, but "
+                             "extraction backend does not support it!");
+                       return WIMLIB_ERR_UNSUPPORTED;
+               }
+               WARNING("Ignoring UNIX metadata (uid/gid/mode/rdev) of %lu files%"TS,
+                       required_features->unix_data,
+                       (supported_features->unix_data ?
+                        T("\n          (use --unix-data mode to extract these)") : T("")));
        }
 
        /* Linux-style extended attributes */
@@ -1384,8 +1385,10 @@ do_feature_check(const struct wim_features *required_features,
            (!supported_features->linux_xattrs ||
             !(extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA)))
        {
-               WARNING("Ignoring Linux-style extended attributes of %lu files",
-                       required_features->linux_xattrs);
+               WARNING("Ignoring Linux-style extended attributes of %lu files%"TS,
+                       required_features->linux_xattrs,
+                       (supported_features->linux_xattrs ?
+                        T("\n          (use --unix-data mode to extract these)") : T("")));
        }
 
        /* Object IDs.  */