thin-provisioning-tools/unit-tests/metadata_checker_t.cc

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2013-04-25 20:57:07 +05:30
#include "gmock/gmock.h"
#include "test_utils.h"
#include "persistent-data/block.h"
#include "thin-provisioning/restore_emitter.h"
#include "thin-provisioning/superblock_checker.h"
#include <unistd.h>
using namespace persistent_data;
using namespace std;
using namespace test;
using namespace testing;
using namespace thin_provisioning;
//----------------------------------------------------------------
namespace {
block_address const BLOCK_SIZE = 4096;
block_address const NR_BLOCKS = 10240;
// FIXME: move to utils
class with_directory {
public:
with_directory(std::string const &path)
: old_path_(pwd()) {
chdir(path);
}
~with_directory() {
chdir(old_path_);
}
private:
std::string pwd() const {
char buffer[PATH_MAX];
char *ptr = getcwd(buffer, sizeof(buffer));
if (!ptr) {
// FIXME: still need a standard syscall failed exception
throw std::runtime_error("getcwd failed");
}
return ptr;
}
void chdir(std::string const &path) {
int r = ::chdir(path.c_str());
if (r < 0)
throw std::runtime_error("chdir failed");
}
std::string old_path_;
std::string new_path_;
};
class with_temp_directory {
public:
with_temp_directory() {
std::string name("./tmp");
rm_rf(name);
mkdir(name);
dir_.reset(new with_directory(name));
}
private:
void rm_rf(std::string const &name) {
std::string cmd("rm -rf ");
cmd += name;
system(cmd);
}
void mkdir(std::string const &name) {
std::string cmd("mkdir ");
cmd += name;
system(cmd);
}
void system(std::string const &cmd) {
int r = ::system(cmd.c_str());
if (r < 0)
throw std::runtime_error("system failed");
}
std::auto_ptr<with_directory> dir_;
};
//--------------------------------
class metadata_builder {
public:
metadata_builder(block_manager<>::ptr bm)
: bm_(bm) {
}
void build() {
metadata::ptr md(new metadata(bm_, metadata::CREATE, 128, 10240));
emitter::ptr restorer = create_restore_emitter(md);
restorer->begin_superblock("test-generated", 0, 0, 128, 10240, boost::optional<uint64_t>());
restorer->end_superblock();
}
// FIXME: add methods to specify volumes with particular
// mapping patterns.
private:
block_manager<>::ptr bm_;
};
class SuperBlockCheckerTests : public Test {
public:
SuperBlockCheckerTests()
: bm_(create_bm<BLOCK_SIZE>()) {
metadata_builder builder(bm_);
builder.build();
}
void corrupt_superblock() {
block_manager<>::write_ref wr = bm_->write_lock(0);
wr.data()[57] = 0;
}
with_temp_directory dir_;
block_manager<>::ptr bm_;
};
}
//----------------------------------------------------------------
TEST_F(SuperBlockCheckerTests, creation_requires_a_block_manager)
{
superblock_checker sc(bm_);
}
TEST_F(SuperBlockCheckerTests, passes_with_good_superblock)
{
superblock_checker sc(bm_);
damage_list_ptr damage = sc.check();
ASSERT_THAT(damage->size(), Eq(0U));
}
TEST_F(SuperBlockCheckerTests, fails_with_bad_checksum)
{
corrupt_superblock();
superblock_checker sc(bm_);
damage_list_ptr damage = sc.check();
ASSERT_THAT(damage->size(), Eq(1u));
metadata_damage::ptr d = *damage->begin();
ASSERT_THAT(dynamic_cast<super_block_corruption *>(d.get()), NotNull());
}
//----------------------------------------------------------------