Enable building of Cgpt C++ Library for 32-bit.

The existing library had a bunch of dependencies which are too many to
build for the 32-bit platform. So this checkin prunes the dependency
list by building only things that are absolutely required for the
functionality used in 32-bit Post-Installer.

Made the use of libuuid restricted only to cgpt and unit tests so that
libcgpt-cc.a doesn't depend on it.

BUG=chromium-os:25374
TEST=Built 32-bit and 64-bit. Tested 32-bit post-install.
Change-Id: Idd0826fdf507a95728fee8adac9520e26f05d469
Reviewed-on: https://gerrit.chromium.org/gerrit/16433
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Commit-Ready: Jay Srinivasan <jaysri@chromium.org>
Tested-by: Jay Srinivasan <jaysri@chromium.org>

Makefile

@@ -105,9 +105,17 @@ all:
 		make -C $$i; \
 	done
 
-libcgpt_cc: all
+libcgpt_cc:
+	mkdir -p ${BUILD}/cgpt ${BUILD}/firmware/lib/cgptlib ${BUILD}/firmware/stub 
 	$(MAKE) -C cgpt libcgpt_cc
-	$(MAKE) -C tests CgptManagerTests
+
+cgptmanager_tests: libcgpt_cc
+	mkdir -p ${BUILD}/tests
+	$(MAKE) -C tests cgptmanager_tests
+
+libdump_kernel_config:
+	mkdir -p ${BUILD}/utility
+	$(MAKE) -C utility $(DUMPKERNELCONFIGLIB)
 
 clean:
 	/bin/rm -rf ${BUILD}

cgpt/CgptManager.cc

@@ -15,6 +15,8 @@ using std::string;
 // We don't use these variables for the libcgpt version.
 const char* progname = "";
 const char* command = "";
+void (*uuid_generator)(uint8_t* buffer) = NULL;
+
 
 // This file implements the C++ wrapper methods over the C cgpt methods.
 

cgpt/CgptManager.h

@@ -6,7 +6,6 @@
 #define VBOOT_REFERENCE_CGPT_CGPTMANAGER_H_
 
 #include <string>
-#include <base/basictypes.h>
 #include "gpt.h"
 
 // This file defines a simple C++ wrapper class interface for the cgpt methods.
@@ -166,7 +165,8 @@ class CgptManager {
     std::string device_name_;
     bool is_initialized_;
 
-    DISALLOW_COPY_AND_ASSIGN(CgptManager);
+    CgptManager(const CgptManager &);
+    void operator=(const CgptManager &);
 };
 
 #endif  // VBOOT_REFERENCE_CGPT_CGPTMANAGER_H_

cgpt/Makefile

@@ -33,18 +33,28 @@ ALL_SRCS = \
 	cgpt_common.c
 
 LIB_CGPT_CC_SRCS = \
-	CgptManager.cc
+	CgptManager.cc \
+	cgpt_create.c \
+	cgpt_add.c \
+	cgpt_boot.c \
+	cgpt_show.c \
+	cgpt_repair.c \
+	cgpt_prioritize.c \
+	cgpt_common.c \
+	../firmware/lib/cgptlib/crc32.c \
+	../firmware/lib/cgptlib/cgptlib_internal.c \
+	../firmware/stub/utility_stub.c
 
 main: $(PROGNAME)
 
 include ../common.mk
 
-LIB_CGPT_CC_OBJS = $(LIB_CGPT_CC_SRCS:%.cc=${BUILD_ROOT}/%.o)
+LIB_CGPT_CC_OBJS = $(LIB_CGPT_CC_SRCS:%.c=${BUILD_ROOT}/%.o) $(LIB_CGPT_CC_SRCS:%.cc=${BUILD_ROOT}/%.o)
 LIB_CGPT_CC_DEPS = $(LIB_CGPT_CC_OBJS:%.o=%.o.d)
 
-libcgpt_cc: main $(LIB_CGPT_CC)
+libcgpt_cc: $(LIB_CGPT_CC)
 
-$(LIB_CGPT_CC): $(ALL_OBJS) $(LIB_CGPT_CC_OBJS)
+$(LIB_CGPT_CC): $(LIB_CGPT_CC_OBJS)
 	rm -f $@
 	ar qc $@ $^
 

cgpt/cgpt.c

@@ -11,10 +11,11 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
-
+#include <uuid/uuid.h>
 
 const char* progname;
 const char* command;
+void (*uuid_generator)(uint8_t* buffer);
 
 struct {
   const char *name;
@@ -51,6 +52,8 @@ int main(int argc, char *argv[]) {
   int match_count = 0;
   int match_index = 0;
 
+  uuid_generator = uuid_generate;
+
   progname = strrchr(argv[0], '/');
   if (progname)
     progname++;

cgpt/cgpt.h

@@ -136,6 +136,13 @@ extern const char* progname;
 extern const char* command;
 void Error(const char *format, ...);
 
+// The code paths that require uuid_generate are not used currently in
+// libcgpt-cc.a so using this method would create an unnecessary dependency
+// on libuuid which then requires us to build it for 32-bit for the static
+// post-installer. So, we just expose this function pointer which should be
+// set to uuid_generate in case of the cgpt binary and can be null or some
+// no-op method in case of ilbcgpt-cc.a.
+extern void (*uuid_generator)(uint8_t* buffer);
 
 // Command functions.
 int cmd_show(int argc, char *argv[]);

cgpt/cgpt_add.c

@@ -233,7 +233,11 @@ int cgpt_add(CgptAddParams *params) {
       goto bad;
     }
     if (!params->set_unique)
-      uuid_generate((uint8_t *)&entry->unique);
+      if (!uuid_generator) {
+        Error("Unable to generate new GUID. uuid_generator not set.\n");
+        goto bad;
+      }
+      (*uuid_generator)((uint8_t *)&entry->unique);
   }
 
   if (params->set_begin)

cgpt/cgpt_create.c

@@ -42,7 +42,11 @@ int cgpt_create(CgptCreateParams *params) {
     h->alternate_lba = drive.gpt.drive_sectors - 1;
     h->first_usable_lba = 1 + 1 + GPT_ENTRIES_SECTORS;
     h->last_usable_lba = drive.gpt.drive_sectors - 1 - GPT_ENTRIES_SECTORS - 1;
-    uuid_generate((uint8_t *)&h->disk_uuid);
+    if (!uuid_generator) {
+      Error("Unable to generate new GUID. uuid_generator not set.\n");
+      goto bad;
+    }
+    (*uuid_generator)((uint8_t *)&h->disk_uuid);
     h->entries_lba = 2;
     h->number_of_entries = 128;
     h->size_of_entry = sizeof(GptEntry);
@@ -55,4 +59,9 @@ int cgpt_create(CgptCreateParams *params) {
 
   // Write it all out
   return DriveClose(&drive, 1);
+
+bad:
+
+  DriveClose(&drive, 0);
+  return CGPT_FAILED;
 }

tests/CgptManagerTests.cc

@@ -22,6 +22,7 @@ extern "C" {
 #include <base/logging.h>
 #include <gflags/gflags.h>
 #include <gtest/gtest.h>
+#include <uuid/uuid.h>
 
 using std::string;
 
@@ -36,7 +37,12 @@ DEFINE_int32(v, 0, 0);
 // This class unit tests the CgptManager class.
 class CgptManagerUnitTest : public ::testing::Test {
 public:
-  CgptManagerUnitTest() { }
+  CgptManagerUnitTest() {
+    // Even though the post-installer doesn't use any methods that require
+    // uuid_generate, for the unit test we use those methods, so we need to
+    // set the uuid_generator.
+    uuid_generator = uuid_generate;
+  }
 
   void SetUp() {
     const string device_name = "/tmp/DummyFileForCgptManagerTests.bin";

tests/Makefile

@@ -59,6 +59,8 @@ all: $(TEST_BINS) ${EXTRA_TARGET}
 
 rbtest: $(BUILD_ROOT)/rollback_index_test
 
+cgptmanager_tests: $(BUILD_ROOT)/CgptManagerTests
+
 ${TEST_LIB}: ${TEST_LIB_OBJS}
 	rm -f $@
 	ar qc $@ $^
@@ -67,9 +69,9 @@ ${TEST_LIB}: ${TEST_LIB_OBJS}
 ${BUILD_ROOT}/CgptManagerTests.o: CgptManagerTests.cc
 	$(CXX) -DWITH_UTIL_MAIN $(CXXFLAGS) $(INCLUDES) -c $< -o $@
 
-CgptManagerTests: ${BUILD_ROOT}/CgptManagerTests.o ${LIBS}
+${BUILD_ROOT}/CgptManagerTests: ${BUILD_ROOT}/CgptManagerTests.o
 	$(CXX) $(CXXFLAGS) $(INCLUDES) $(LDFLAGS) -lgtest -lgflags $^ \
-	${BUILD}/cgpt/libcgpt-cc.a ${FWLIB} $(HOSTLIB) -lbase -lpthread -lrt -o ${BUILD_ROOT}/$@
+	${BUILD}/cgpt/libcgpt-cc.a -lbase -lpthread -lrt -o $@
 
 ${BUILD_ROOT}/vboot_audio_for_test.o : $(FWDIR)/lib/vboot_audio.c
 	$(CC) $(CFLAGS) -DCUSTOM_MUSIC $(INCLUDES) \