Implementation of CgptManager C++ library and unit tests.

CgptManager exposes the cgpt commands via a C++ library so that
the post-installer for 32- to 64-bit upgrade can link directly
against a library and thus avoid any shell dependency.

The default make target will not build libcgpt-cc.a since it
requires some dependencies that are available only in chroot.
A separate follow-up checkin to the vboot_reference
ebuild will enable emerging the libcgpt-cc.a by default.

BUG=chromium-os:25374
TEST=Tested with the new unit tests for CgptManager,
     ran existing cgpt unit tests,  as well as running the
     cgpt commands manually. Built on both amd64 and x86.
     Tested that vboot_reference is also buildable outside of chroot.
     Tested that vboot_reference-firmware and vboot_reference-tests
     also build fine with these changes.
CQ-DEPEND=I99f6c321e09c2425eaa8171d78685d2d731954c8
Change-Id: I59a896255b8ea2fc8b1b2150ae7c4ff9d0769699
Reviewed-on: https://gerrit.chromium.org/gerrit/15730
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Commit-Ready: Jay Srinivasan <jaysri@chromium.org>
Tested-by: Jay Srinivasan <jaysri@chromium.org>

1 files changed, 39 insertions, 3 deletions

diff --git a/cgpt/cgpt_show.c b/cgpt/cgpt_show.c
index 068895cb..d4170b1c 100644
--- a/cgpt/cgpt_show.c
+++ b/cgpt/cgpt_show.c
@@ -178,6 +178,42 @@ void EntriesDetails(GptData *gpt, const int secondary, int raw) {
   }
 }
 
+int cgpt_get_num_non_empty_partitions(CgptShowParams *params) {
+  struct drive drive;
+  int gpt_retval;
+  int retval;
+
+  if (params == NULL)
+    return CGPT_FAILED;
+
+  if (CGPT_OK != DriveOpen(params->drive_name, &drive))
+    return CGPT_FAILED;
+
+  if (GPT_SUCCESS != (gpt_retval = GptSanityCheck(&drive.gpt))) {
+    Error("GptSanityCheck() returned %d: %s\n",
+          gpt_retval, GptError(gpt_retval));
+    retval = CGPT_FAILED;
+    goto done;
+  }
+
+  params->num_partitions = 0;
+  int numEntries = GetNumberOfEntries(&drive.gpt);
+  int i;
+  for(i = 0; i < numEntries; i++) {
+      GptEntry *entry = GetEntry(&drive.gpt, ANY_VALID, i);
+      if (IsZero(&entry->type))
+        continue;
+
+      params->num_partitions++;
+  }
+
+  retval = CGPT_OK;
+
+done:
+  DriveClose(&drive, 0);
+  return retval;
+}
+
 int cgpt_show(CgptShowParams *params) {
   struct drive drive;
   int gpt_retval;
@@ -185,7 +221,7 @@ int cgpt_show(CgptShowParams *params) {
   if (params == NULL)
     return CGPT_FAILED;
 
-  if (CGPT_OK != DriveOpen(params->driveName, &drive))
+  if (CGPT_OK != DriveOpen(params->drive_name, &drive))
     return CGPT_FAILED;
 
   if (GPT_SUCCESS != (gpt_retval = GptSanityCheck(&drive.gpt))) {
@@ -339,8 +375,8 @@ int cgpt_show(CgptShowParams *params) {
     }
   }
 
-  (void) CheckValid(&drive);
-  (void) DriveClose(&drive, 0);
+  CheckValid(&drive);
+  DriveClose(&drive, 0);
 
   return CGPT_OK;
 }