cgpt: add -d option for cgpt show

The debug mode is used to dump GPT headers and entries no matter the
they are valid or not.

BUG=chromium-os:32142
TEST=tested in chroot with the bad secondary entries.
% cgpt show /dev/sda -d
 ...
 976773135        32 INVALID  Sec GPT table
    282624 968101888       1  Label: "STATE"
                              Type: Linux data
 ...
         1         1 INVALID  Sec GPT header
                              Sig: [EFI PART]
                              Rev: 0x00010000
 ...

Change-Id: Ie54068353b87c9f15915ffb51b8de688e0367975
Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/26091
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Tested-by: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com>
Commit-Ready: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/cgpt/cmd_show.c b/cgpt/cmd_show.c
index 6443931f..fa0e5f8b 100644
--- a/cgpt/cmd_show.c
+++ b/cgpt/cmd_show.c
@@ -28,6 +28,7 @@ static void Usage(void)
          "               -T  Tries flag\n"
          "               -P  Priority flag\n"
          "               -A  raw 64-bit attribute value\n"
+         "  -d           Debug output (including invalid headers)\n"
          "\n", progname);
 }
 
@@ -40,7 +41,7 @@ int cmd_show(int argc, char *argv[]) {
   char *e = 0;
 
   opterr = 0;                     // quiet, you
-  while ((c=getopt(argc, argv, ":hnvqi:bstulSTPA")) != -1)
+  while ((c=getopt(argc, argv, ":hnvqi:bstulSTPAd")) != -1)
   {
     switch (c)
     {
@@ -73,6 +74,10 @@ int cmd_show(int argc, char *argv[]) {
       params.single_item = c;
       break;
 
+    case 'd':
+      params.debug = 1;
+      break;
+
     case 'h':
       Usage();
       return CGPT_OK;