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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <fcntl.h>
#include <sys/stat.h>
#include <tuple>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/util/file_descriptor.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
using ::testing::IsEmpty;
using ::testing::Not;
class StatTimesTest : public ::testing::Test {
protected:
std::tuple<absl::Time, absl::Time, absl::Time> GetTime(const TempPath& file) {
struct stat statbuf = {};
EXPECT_THAT(stat(file.path().c_str(), &statbuf), SyscallSucceeds());
const auto atime = absl::TimeFromTimespec(statbuf.st_atim);
const auto mtime = absl::TimeFromTimespec(statbuf.st_mtim);
const auto ctime = absl::TimeFromTimespec(statbuf.st_ctim);
return std::make_tuple(atime, mtime, ctime);
}
};
TEST_F(StatTimesTest, FileCreationTimes) {
const DisableSave ds; // Timing-related test.
// Get a time for when the file is created.
const absl::Time before = absl::Now() - absl::Seconds(1);
const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
const absl::Time after = absl::Now() + absl::Seconds(1);
absl::Time atime, mtime, ctime;
std::tie(atime, mtime, ctime) = GetTime(file);
EXPECT_LE(before, atime);
EXPECT_LE(before, mtime);
EXPECT_LE(before, ctime);
EXPECT_GE(after, atime);
EXPECT_GE(after, mtime);
EXPECT_GE(after, ctime);
}
TEST_F(StatTimesTest, FileCtimeChanges) {
auto file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
MaybeSave(); // FIXME(b/69865927): ctime is inconsistent.
absl::Time atime, mtime, ctime;
std::tie(atime, mtime, ctime) = GetTime(file);
absl::SleepFor(absl::Seconds(1));
// Chmod should only change ctime.
EXPECT_THAT(chmod(file.path().c_str(), 0666), SyscallSucceeds());
absl::Time atime2, mtime2, ctime2;
std::tie(atime2, mtime2, ctime2) = GetTime(file);
EXPECT_EQ(atime2, atime);
EXPECT_EQ(mtime2, mtime);
EXPECT_GT(ctime2, ctime);
absl::SleepFor(absl::Seconds(1));
// Rename should only change ctime.
const auto newpath = NewTempAbsPath();
EXPECT_THAT(rename(file.path().c_str(), newpath.c_str()), SyscallSucceeds());
file.reset(newpath);
std::tie(atime, mtime, ctime) = GetTime(file);
EXPECT_EQ(atime, atime2);
EXPECT_EQ(mtime, mtime2);
EXPECT_GT(ctime, ctime2);
absl::SleepFor(absl::Seconds(1));
// Utimes should only change ctime and the time that we ask to change (atime
// to now in this case).
const absl::Time before = absl::Now() - absl::Seconds(1);
const struct timespec ts[2] = {{0, UTIME_NOW}, {0, UTIME_OMIT}};
ASSERT_THAT(utimensat(AT_FDCWD, file.path().c_str(), ts, 0),
SyscallSucceeds());
const absl::Time after = absl::Now() + absl::Seconds(1);
std::tie(atime2, mtime2, ctime2) = GetTime(file);
EXPECT_LE(before, atime2);
EXPECT_GE(after, atime2);
EXPECT_EQ(mtime2, mtime);
EXPECT_GT(ctime2, ctime);
}
TEST_F(StatTimesTest, FileMtimeChanges) {
const auto file = ASSERT_NO_ERRNO_AND_VALUE(
TempPath::CreateFileWith(GetAbsoluteTestTmpdir(), "yaaass", 0666));
absl::Time atime, mtime, ctime;
std::tie(atime, mtime, ctime) = GetTime(file);
absl::SleepFor(absl::Seconds(1));
// Truncate should only change mtime and ctime.
EXPECT_THAT(truncate(file.path().c_str(), 0), SyscallSucceeds());
absl::Time atime2, mtime2, ctime2;
std::tie(atime2, mtime2, ctime2) = GetTime(file);
EXPECT_EQ(atime2, atime);
EXPECT_GT(mtime2, mtime);
EXPECT_GT(ctime2, ctime);
absl::SleepFor(absl::Seconds(1));
// Write should only change mtime and ctime.
const auto fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR, 0));
const std::string contents = "all the single dollars";
EXPECT_THAT(write(fd.get(), contents.data(), contents.size()),
SyscallSucceeds());
std::tie(atime, mtime, ctime) = GetTime(file);
EXPECT_EQ(atime, atime2);
EXPECT_GT(mtime, mtime2);
EXPECT_GT(ctime, ctime2);
}
TEST_F(StatTimesTest, FileAtimeChanges) {
const std::string contents = "bills bills bills";
const auto file = ASSERT_NO_ERRNO_AND_VALUE(
TempPath::CreateFileWith(GetAbsoluteTestTmpdir(), contents, 0666));
MaybeSave(); // FIXME(b/69865927): ctime is inconsistent.
absl::Time atime, mtime, ctime;
std::tie(atime, mtime, ctime) = GetTime(file);
absl::SleepFor(absl::Seconds(1));
const auto fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY, 0));
// Read should only change atime.
char buf[20];
const absl::Time before = absl::Now() - absl::Seconds(1);
int read_result;
ASSERT_THAT(read_result = read(fd.get(), buf, sizeof(buf)),
SyscallSucceeds());
const absl::Time after = absl::Now() + absl::Seconds(1);
EXPECT_EQ(std::string(buf, read_result), contents);
absl::Time atime2, mtime2, ctime2;
std::tie(atime2, mtime2, ctime2) = GetTime(file);
EXPECT_LE(before, atime2);
EXPECT_GE(after, atime2);
EXPECT_GT(atime2, atime);
EXPECT_EQ(mtime2, mtime);
EXPECT_EQ(ctime2, ctime);
}
TEST_F(StatTimesTest, DirAtimeChanges) {
const auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
const auto file =
ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir.path()));
MaybeSave(); // FIXME(b/69865927): ctime is inconsistent.
absl::Time atime, mtime, ctime;
std::tie(atime, mtime, ctime) = GetTime(dir);
absl::SleepFor(absl::Seconds(1));
const absl::Time before = absl::Now() - absl::Seconds(1);
// NOTE(b/37756234): Keep an fd open. This ensures that the inode backing the
// directory won't be destroyed before the final GetTime to avoid writing out
// timestamps and causing side effects.
const auto fd = ASSERT_NO_ERRNO_AND_VALUE(Open(dir.path(), O_RDONLY, 0));
// Listing the directory contents should only change atime.
auto contents = ASSERT_NO_ERRNO_AND_VALUE(ListDir(dir.path(), false));
EXPECT_THAT(contents, Not(IsEmpty()));
const absl::Time after = absl::Now() + absl::Seconds(1);
absl::Time atime2, mtime2, ctime2;
std::tie(atime2, mtime2, ctime2) = GetTime(dir);
EXPECT_LE(before, atime2);
EXPECT_GE(after, atime2);
EXPECT_GT(atime2, atime);
EXPECT_EQ(mtime2, mtime);
EXPECT_EQ(ctime2, ctime);
}
} // namespace
} // namespace testing
} // namespace gvisor
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