complete 'cgpt show' and refactor for incoming commands.

src/platform/vboot_reference/utility/cgpt/cgpt_repair.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Repair headers and tables.
  *
  * If primary header or table is invalid, it copies from secondary (vice versa).
  */
 #include <getopt.h>
 #include <stdio.h>
@@ skipping 48 matching lines @@
                      repair_options_details))
     return CGPT_FAILED;
   if (help != NOT_INITED) {
     RepairHelp();
     return CGPT_FAILED;
   }
 
   if (CGPT_OK != OpenDriveInLastArgument(argc, argv, &drive))
     return CGPT_FAILED;
 
+  GptRepair(&drive.gpt);
+  if (drive.gpt.modified & GPT_MODIFIED_HEADER1)
+    printf("* Pri Header is updated.\n");
+  if (drive.gpt.modified & GPT_MODIFIED_ENTRIES1)
+    printf("* Pri Table Entries is updated.\n");
+  if (drive.gpt.modified & GPT_MODIFIED_ENTRIES2)
+    printf("* Sec Table Entries is updated.\n");
+  if (drive.gpt.modified & GPT_MODIFIED_HEADER2)
+    printf("* Sec Header is updated.\n");
+
   DriveClose(&drive);
 
   return CGPT_OK;
 }