libchromeos: add process control library, syslog logging capability, and run unit tests

chromeos/process_test.cc

+// Copyright (c) 2011 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 <chromeos/process.h>
+#include <chromeos/test_helpers.h>
+
+#include <base/file_util.h>
+#include <gtest/gtest.h>
+
+// This test assumes the following standard binaries are installed.
+static const char kBinBash[] = "/bin/bash";
+static const char kBinCp[] = "/bin/cp";
+static const char kBinEcho[] = "/bin/echo";
+static const char kBinFalse[] = "/bin/false";
+static const char kBinSleep[] = "/bin/sleep";
+
+TEST(SimpleProcess, Basic) {
+  ProcessImpl process;
+  process.AddArg(kBinEcho);
+  EXPECT_EQ(0, process.Run());
+  EXPECT_EQ("", syslog_logging::GetAccumulatedLogging());
+}
+
+class ProcessTest : public ::testing::Test {

[petkov, 2011/02/25 19:20:16]

maybe add a test that checks that you're not leaking file descriptors? :-)

[kmixter1, 2011/02/26 00:54:31]

Fixed the code.  Not really sure of an easy/non-fragile way to do that since the
leak was happening from the context of the child process and even if you used
procfs to count open filedescs you would need to know that the child doesn't
open anything itself.  If you can think of an easy way to check this, let me
know.

+ public:
+  void SetUp() {
+    test_path_ = FilePath("test");
+    output_file_ = test_path_.Append("fork_out").value();
+    file_util::Delete(test_path_, true);
+    file_util::CreateDirectory(test_path_);
+    process_.SetOutput(output_file_);
+    syslog_logging::ClearAccumulatedLog();
+  }
+
+  void TearDown() {

[petkov, 2011/02/25 19:20:16]

delete test_path_?

[kmixter1, 2011/02/26 00:54:31]

Done.

+  }
+
+ protected:
+  ProcessImpl process_;
+  std::vector<const char*> args_;
+  std::string output_file_;
+  FilePath test_path_;
+};
+
+TEST_F(ProcessTest, Basic) {
+  process_.AddArg(kBinEcho);
+  process_.AddArg("hello world");
+  EXPECT_EQ(0, process_.Run());
+  ExpectFileEquals("hello world\n", output_file_.c_str());
+  EXPECT_EQ("", syslog_logging::GetAccumulatedLogging());
+}
+
+TEST_F(ProcessTest, AddStringValue) {
+  process_.AddArg(kBinEcho);
+  process_.AddStringValue("--hello", "world");
+  EXPECT_EQ(0, process_.Run());
+  ExpectFileEquals("--hello world\n", output_file_.c_str());
+}
+
+TEST_F(ProcessTest, AddIntValue) {
+  process_.AddArg(kBinEcho);
+  process_.AddIntValue("--answer", 42);
+  EXPECT_EQ(0, process_.Run());
+  ExpectFileEquals("--answer 42\n", output_file_.c_str());
+}
+
+TEST_F(ProcessTest, NonZeroReturnValue) {
+  process_.AddArg(kBinFalse);
+  EXPECT_EQ(1, process_.Run());
+  ExpectFileEquals("", output_file_.c_str());
+  EXPECT_EQ("", syslog_logging::GetAccumulatedLogging());
+}
+
+TEST_F(ProcessTest, BadOutputFile) {
+  process_.AddArg(kBinEcho);
+  process_.SetOutput("/bad/path");
+  EXPECT_EQ(127, process_.Run());
+}
+
+TEST_F(ProcessTest, ExistingOutputFile) {
+  process_.AddArg(kBinEcho);
+  process_.AddArg("hello world");
+  EXPECT_FALSE(file_util::PathExists(FilePath(output_file_)));
+  EXPECT_EQ(0, process_.Run());
+  EXPECT_TRUE(file_util::PathExists(FilePath(output_file_)));
+  EXPECT_EQ(127, process_.Run());
+}
+
+TEST_F(ProcessTest, BadExecutable) {
+  process_.AddArg("false");
+  EXPECT_EQ(127, process_.Run());
+}
+
+TEST_F(ProcessTest, StderrCaptured) {
+  std::string contents;
+  process_.AddArg(kBinCp);
+  EXPECT_EQ(1, process_.Run());
+  EXPECT_TRUE(file_util::ReadFileToString(FilePath(output_file_),
+                                                   &contents));
+  EXPECT_NE(std::string::npos, contents.find("missing file operand"));
+  EXPECT_EQ("", syslog_logging::GetAccumulatedLogging());
+}
+
+TEST_F(ProcessTest, NoParams) {
+  EXPECT_EQ(127, process_.Run());
+}
+
+TEST_F(ProcessTest, SegFaultHandling) {
+  process_.AddArg(kBinBash);
+  process_.AddArg("-c");
+  process_.AddArg("kill -SEGV $$");
+  EXPECT_EQ(-1, process_.Run());
+  EXPECT_TRUE(syslog_logging::Contains("Process did not exit normally"));
+}
+
+TEST_F(ProcessTest, KillNoPid) {
+  process_.Kill(SIGTERM, 0);
+  EXPECT_TRUE(syslog_logging::Contains("Process not running"));
+}
+
+TEST_F(ProcessTest, ProcessExists) {
+  EXPECT_FALSE(process_.ProcessExists(0));

[petkov, 2011/02/25 19:20:16]

shouldn't you test Process::ProcessExists directly given that it's static?

[kmixter1, 2011/02/26 00:54:31]

Done.

+  EXPECT_TRUE(process_.ProcessExists(1));
+  EXPECT_TRUE(process_.ProcessExists(getpid()));
+}
+
+TEST_F(ProcessTest, ResetPidByFile) {
+  FilePath pid_path = test_path_.Append("pid");
+  EXPECT_FALSE(process_.ResetPidByFile(pid_path.value()));
+  EXPECT_TRUE(file_util::WriteFile(pid_path, "456\n", 4));
+  EXPECT_TRUE(process_.ResetPidByFile(pid_path.value()));
+  EXPECT_EQ(456, process_.GetPid());
+}
+
+TEST_F(ProcessTest, KillSleeper) {
+  process_.AddArg(kBinSleep);
+  process_.AddArg("10000");
+  ASSERT_TRUE(process_.Start());
+  pid_t pid = process_.GetPid();
+  ASSERT_GT(pid, 1);
+  int timeout = 100;
+  while(timeout > 0) {
+    if (Process::ProcessExists(pid))

[petkov, 2011/02/25 19:20:16]

why would this return false?

[kmixter1, 2011/02/26 00:54:31]

ugh. yeah, I was thinking about waiting until after exec, but of course this
loop wouldn't do that.  So removing.

+      break;
+    sleep(1);
+    --timeout;
+  }
+  EXPECT_GT(timeout, 0);
+  EXPECT_TRUE(process_.Kill(SIGTERM, 1));
+  EXPECT_EQ(0, process_.GetPid());
+}
+
+TEST_F(ProcessTest, Reset) {
+  process_.AddArg(kBinFalse);
+  process_.Reset(0);
+  process_.AddArg(kBinEcho);
+  EXPECT_EQ(0, process_.Run());
+}