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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "src/traced/probes/filesystem/fs_mount.h"
     18 
     19 #include <fcntl.h>
     20 #include <stdio.h>
     21 #include <stdlib.h>
     22 #include <sys/stat.h>
     23 
     24 #include "gmock/gmock.h"
     25 #include "gtest/gtest.h"
     26 #include "perfetto/base/build_config.h"
     27 #include "perfetto/base/scoped_file.h"
     28 #include "perfetto/base/temp_file.h"
     29 #include "perfetto/base/utils.h"
     30 
     31 namespace perfetto {
     32 namespace {
     33 
     34 using testing::Contains;
     35 using testing::Pair;
     36 
     37 #if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
     38     PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
     39 TEST(FsMountTest, ParseRealMounts) {
     40   std::multimap<BlockDeviceID, std::string> mounts = ParseMounts();
     41   struct stat buf = {};
     42   ASSERT_NE(stat("/proc", &buf), -1);
     43   EXPECT_THAT(mounts, Contains(Pair(buf.st_dev, "/proc")));
     44 }
     45 #endif
     46 
     47 TEST(FsMountTest, ParseSyntheticMounts) {
     48   const char kMounts[] = R"(
     49 sysfs / sysfs rw,nosuid,nodev,noexec,relatime 0 0
     50 #INVALIDLINE
     51 devfs /dev devfs,local,nobrowse
     52 )";
     53 
     54   base::TempFile tmp_file = base::TempFile::Create();
     55   base::ignore_result(write(tmp_file.fd(), kMounts, sizeof(kMounts)));
     56   std::multimap<BlockDeviceID, std::string> mounts =
     57       ParseMounts(tmp_file.path().c_str());
     58   struct stat dev_stat = {}, root_stat = {};
     59   ASSERT_NE(stat("/dev", &dev_stat), -1);
     60   ASSERT_NE(stat("/", &root_stat), -1);
     61   EXPECT_THAT(mounts, Contains(Pair(dev_stat.st_dev, "/dev")));
     62   EXPECT_THAT(mounts, Contains(Pair(root_stat.st_dev, "/")));
     63 }  // namespace
     64 
     65 }  // namespace
     66 }  // namespace perfetto
     67