Add support for bsdiff of file system metadata blocks

test_utils.cc

 // Copyright (c) 2009 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.
 
 #include "update_engine/test_utils.h"
 
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <stdio.h>
@@ skipping 160 matching lines @@
 
 void FillWithData(vector<char>* buffer) {
   size_t input_counter = 0;
   for (vector<char>::iterator it = buffer->begin(); it != buffer->end(); ++it) {
     *it = kRandomString[input_counter];
     input_counter++;
     input_counter %= sizeof(kRandomString);
   }
 }
 
+void CreateEmptyExtImageAtPath(const string& path,
+                               size_t size,
+                               int block_size) {
+  EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
+                                   " seek=%Zu bs=1 count=1",

[petkov, 2010/12/10 00:46:55]

what's %Zu?

[thieule, 2010/12/14 23:11:21]

Looks like %Zu is outdated and the proper format is %zu for size_t.

+                                   path.c_str(), size)));
+  EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -b %d -F %s",

[petkov, 2010/12/10 00:46:55]

we use ext2 now, right?

[thieule, 2010/12/14 23:11:21]

This is a little bit more involved than just here.  I'll do the ext3 to ext2
change in a separate CL.

+                                   block_size, path.c_str())));
+}
+
 void CreateExtImageAtPath(const string& path, vector<string>* out_paths) {
   // create 10MiB sparse file
   EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
                                    " seek=10485759 bs=1 count=1",
                                    path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -b 4096 -F %s", path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkdir -p %s", kMountPath)));
   EXPECT_EQ(0, System(StringPrintf("mount -o loop %s %s", path.c_str(),
                                    kMountPath)));
   EXPECT_EQ(0, System(StringPrintf("echo hi > %s/hi", kMountPath)));
@@ skipping 66 matching lines @@
   EXPECT_TRUE(expected_paths.empty());
   if (!expected_paths.empty()) {
     for (set<string>::const_iterator it = expected_paths.begin();
          it != expected_paths.end(); ++it) {
       LOG(INFO) << "extra path: " << *it;
     }
   }
 }
 
 }  // namespace chromeos_update_engine