cgpt supports dev and add/delete/modify commands.

src/platform/vboot_reference/utility/cgpt/cgpt_attribute.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.
  *
  * Update GPT attribute bits.
  */
 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include "cgpt.h"
 #include "cgptlib_internal.h"
 #include "utility.h"
 
 static struct number_range
     range_1_0 = {1, 0},
     range_15_0 = {15, 0};
 
 /* Integers to store parsed argument. */
 static int help, partition, bad, successful, tries, priority;
 
 /* The structure for getopt_long(). When you add/delete any line, please refine
  * attribute_comments[] and third parameter of getopt_long() too.  */
 static struct option attribute_options[] = {
   {.name = "help", .has_arg = no_argument, .flag = 0, .val = 'h'},
   {.name = "partition", .has_arg = required_argument, .flag = 0, .val = 'i'},
   {.name = "bad", .has_arg = required_argument, .flag = 0, .val = 'b'},
   {.name = "successful", .has_arg = required_argument, .flag = 0, .val = 's'},
   {.name = "tries", .has_arg = required_argument, .flag = 0, .val = 't'},
   {.name = "priority", .has_arg = required_argument, .flag = 0, .val = 'p'},
+  { /* last element, which should be zero. */ }
 };
 
 /* Extra information than struct option, please update this structure if you
  * add/remove any line in attribute_options[]. */
 static struct option_details attribute_options_details[] = {
   /* help */
   { .comment = "print this help",
     .validator = AssignTrue,
     .valid_range = 0,
     .parsed = &help},
@@ skipping 16 matching lines @@
   /* tries */
   { .comment = "tries",
     .validator = InNumberRange,
     .valid_range = &range_15_0,
     .parsed = &tries},
   /* priority */
   { .comment = "priority to boot",
     .validator = InNumberRange,
     .valid_range = &range_15_0,
     .parsed = &priority},
+  { /* last element, which should be zero. */ }
 };
 
 void AttributeHelp() {
   printf("\nUsage: %s attribute [OPTIONS] device_name\n\n", progname);
   ShowOptions(attribute_options, attribute_options_details,
               ARRAY_COUNT(attribute_options));
   printf("\n* Attribute command only applies on ChromeOS kernel entry.\n\n");
 }
 
 /* Parses all options (and validates them), then opens the drive and sets
@@ skipping 18 matching lines @@
   if (help != NOT_INITED) {
     AttributeHelp();
     return CGPT_FAILED;
   }
 
   if (CGPT_OK != OpenDriveInLastArgument(argc, argv, &drive))
     return CGPT_FAILED;
 
   if (CheckValid(&drive) != CGPT_OK) return CGPT_FAILED;
 
-  debug("[OPTION] i:%d b:%d s:%d t:%d p:%d\n", partition, bad, successful, tries, priority);  /* FIXME */
-
   /* partition is not specified, search for the first Chromeos kernel. */
   if (partition == NOT_INITED) {
     int i;
     for (i = 0; i < GetNumberOfEntries(&drive.gpt); ++i) {
       static Guid chromeos_kernel = GPT_ENT_TYPE_CHROMEOS_KERNEL;
       GptEntry *entry;
       entry = GetEntry(&drive.gpt, PRIMARY, i);
       if (!Memcmp(&chromeos_kernel, &entry->type, sizeof(Guid))) {
         partition = i;
         break;
@@ skipping 24 matching lines @@
   RepairHeader(&drive.gpt, MASK_PRIMARY);
   /* Forces headers and entries are modified so that CRC32 will be re-calculated
    * and headers and entries will be updated to drive. */
   drive.gpt.modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1 |
                          GPT_MODIFIED_HEADER2 | GPT_MODIFIED_ENTRIES2);
   UpdateCrc(&drive.gpt);
   DriveClose(&drive);
 
   return CGPT_OK;
 }