odrefresh/odrefresh_main.cc - platform/art - Git at Google

 /*
  * Copyright (C) 2020 The Android Open Source Project
  *
  * 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 <sys/stat.h>

 #include <string>
 #include <string_view>
 #include <unordered_map>

 #include "android-base/properties.h"
 #include "android-base/stringprintf.h"
 #include "android-base/strings.h"
 #include "arch/instruction_set.h"
 #include "base/file_utils.h"
 #include "base/globals.h"
 #include "base/stl_util.h"
 #include "odr_common.h"
 #include "odr_compilation_log.h"
 #include "odr_config.h"
 #include "odr_metrics.h"
 #include "odrefresh.h"
 #include "odrefresh/odrefresh.h"

 namespace {

 using ::android::base::GetProperty;
 using ::android::base::StartsWith;
 using ::art::odrefresh::CompilationOptions;
 using ::art::odrefresh::ExitCode;
 using ::art::odrefresh::kCheckedSystemPropertyPrefixes;
 using ::art::odrefresh::kIgnoredSystemProperties;
 using ::art::odrefresh::kSystemProperties;
 using ::art::odrefresh::kSystemPropertySystemServerCompilerFilterOverride;
 using ::art::odrefresh::OdrCompilationLog;
 using ::art::odrefresh::OdrConfig;
 using ::art::odrefresh::OdrMetrics;
 using ::art::odrefresh::OnDeviceRefresh;
 using ::art::odrefresh::QuotePath;
 using ::art::odrefresh::ShouldDisablePartialCompilation;
 using ::art::odrefresh::ShouldDisableRefresh;
 using ::art::odrefresh::SystemPropertyConfig;
 using ::art::odrefresh::SystemPropertyForeach;
 using ::art::odrefresh::ZygoteKind;

 void UsageMsgV(const char* fmt, va_list ap) {
   std::string error;
   android::base::StringAppendV(&error, fmt, ap);
   if (isatty(fileno(stderr))) {
     std::cerr << error << std::endl;
   } else {
     LOG(ERROR) << error;
   }
 }

 void UsageMsg(const char* fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
   UsageMsgV(fmt, ap);
   va_end(ap);
 }

 NO_RETURN void ArgumentError(const char* fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
   UsageMsgV(fmt, ap);
   va_end(ap);
   UsageMsg("Try '--help' for more information.");
   exit(EX_USAGE);
 }

 bool ParseZygoteKind(const char* input, ZygoteKind* zygote_kind) {
   std::string_view z(input);
   if (z == "zygote32") {
     *zygote_kind = ZygoteKind::kZygote32;
     return true;
   } else if (z == "zygote32_64") {
     *zygote_kind = ZygoteKind::kZygote32_64;
     return true;
   } else if (z == "zygote64_32") {
     *zygote_kind = ZygoteKind::kZygote64_32;
     return true;
   } else if (z == "zygote64") {
     *zygote_kind = ZygoteKind::kZygote64;
     return true;
   }
   return false;
 }

 std::string GetEnvironmentVariableOrDie(const char* name) {
   const char* value = getenv(name);
   LOG_ALWAYS_FATAL_IF(value == nullptr, "%s is not defined.", name);
   return value;
 }

 std::string GetEnvironmentVariableOrDefault(const char* name, std::string default_value) {
   const char* value = getenv(name);
   if (value == nullptr) {
     return default_value;
   }
   return value;
 }

 bool ArgumentMatches(std::string_view argument, std::string_view prefix, std::string* value) {
   if (android::base::StartsWith(argument, prefix)) {
     *value = std::string(argument.substr(prefix.size()));
     return true;
   }
   return false;
 }

 bool ArgumentEquals(std::string_view argument, std::string_view expected) {
   return argument == expected;
 }

 int InitializeConfig(int argc, char** argv, OdrConfig* config) {
   config->SetApexInfoListFile("/apex/apex-info-list.xml");
   config->SetArtBinDir(art::GetArtBinDir());
   config->SetBootClasspath(GetEnvironmentVariableOrDie("BOOTCLASSPATH"));
   config->SetDex2oatBootclasspath(GetEnvironmentVariableOrDie("DEX2OATBOOTCLASSPATH"));
   config->SetSystemServerClasspath(GetEnvironmentVariableOrDie("SYSTEMSERVERCLASSPATH"));
   config->SetStandaloneSystemServerJars(
       GetEnvironmentVariableOrDefault("STANDALONE_SYSTEMSERVER_JARS", /*default_value=*/""));
   config->SetIsa(art::kRuntimeISA);

   std::string zygote;
   int n = 1;
   for (; n < argc - 1; ++n) {
     const char* arg = argv[n];
     std::string value;
     if (ArgumentEquals(arg, "--compilation-os-mode")) {
       config->SetCompilationOsMode(true);
     } else if (ArgumentMatches(arg, "--dalvik-cache=", &value)) {
       art::OverrideDalvikCacheSubDirectory(value);
       config->SetArtifactDirectory(GetApexDataDalvikCacheDirectory(art::InstructionSet::kNone));
     } else if (ArgumentMatches(arg, "--zygote-arch=", &value)) {
       zygote = value;
     } else if (ArgumentMatches(arg, "--boot-image-compiler-filter=", &value)) {
       config->SetBootImageCompilerFilter(value);
     } else if (ArgumentMatches(arg, "--system-server-compiler-filter=", &value)) {
       config->SetSystemServerCompilerFilter(value);
     } else if (ArgumentMatches(arg, "--staging-dir=", &value)) {
       config->SetStagingDir(value);
     } else if (ArgumentEquals(arg, "--dry-run")) {
       config->SetDryRun();
     } else if (ArgumentEquals(arg, "--partial-compilation")) {
       config->SetPartialCompilation(true);
     } else if (ArgumentEquals(arg, "--no-refresh")) {
       config->SetRefresh(false);
     } else if (ArgumentEquals(arg, "--minimal")) {
       config->SetMinimal(true);
     } else {
       ArgumentError("Unrecognized argument: '%s'", arg);
     }
   }

   if (zygote.empty()) {
     // Use ro.zygote by default, if not overridden by --zygote-arch flag.
     zygote = GetProperty("ro.zygote", {});
   }
   ZygoteKind zygote_kind;
   if (!ParseZygoteKind(zygote.c_str(), &zygote_kind)) {
     LOG(FATAL) << "Unknown zygote: " << QuotePath(zygote);
   }
   config->SetZygoteKind(zygote_kind);

   if (config->GetSystemServerCompilerFilter().empty()) {
     std::string filter = GetProperty("dalvik.vm.systemservercompilerfilter", "");
     filter = GetProperty(kSystemPropertySystemServerCompilerFilterOverride, filter);
     config->SetSystemServerCompilerFilter(filter);
   }

   if (!config->HasPartialCompilation() &&
       ShouldDisablePartialCompilation(
           GetProperty("ro.build.version.security_patch", /*default_value=*/""))) {
     config->SetPartialCompilation(false);
   }

   if (ShouldDisableRefresh(GetProperty("ro.build.version.sdk", /*default_value=*/""))) {
     config->SetRefresh(false);
   }

   return n;
 }

 void GetSystemProperties(std::unordered_map<std::string, std::string>* system_properties) {
   SystemPropertyForeach([&](const char* name, const char* value) {
     if (strlen(value) == 0) {
       return;
     }
     for (const char* prefix : kCheckedSystemPropertyPrefixes) {
       if (StartsWith(name, prefix) && !art::ContainsElement(kIgnoredSystemProperties, name)) {
         (*system_properties)[name] = value;
       }
     }
   });
   for (const SystemPropertyConfig& system_property_config : *kSystemProperties.get()) {
     (*system_properties)[system_property_config.name] =
         GetProperty(system_property_config.name, system_property_config.default_value);
   }
 }

 NO_RETURN void UsageHelp(const char* argv0) {
   std::string name(android::base::Basename(argv0));
   UsageMsg("Usage: %s [OPTION...] ACTION", name.c_str());
   UsageMsg("On-device refresh tool for boot classpath and system server");
   UsageMsg("following an update of the ART APEX.");
   UsageMsg("");
   UsageMsg("Valid ACTION choices are:");
   UsageMsg("");
   UsageMsg("--check          Check compilation artifacts are up-to-date based on metadata.");
   UsageMsg("--compile        Compile boot classpath and system_server jars when necessary.");
   UsageMsg("--force-compile  Unconditionally compile the bootclass path and system_server jars.");
   UsageMsg("--help           Display this help information.");
   UsageMsg("");
   UsageMsg("Available OPTIONs are:");
   UsageMsg("");
   UsageMsg("--dry-run");
   UsageMsg("--partial-compilation            Only generate artifacts that are out-of-date or");
   UsageMsg("                                 missing.");
   UsageMsg("--no-refresh                     Do not refresh existing artifacts.");
   UsageMsg("--compilation-os-mode            Indicate that odrefresh is running in Compilation");
   UsageMsg("                                 OS.");
   UsageMsg("--dalvik-cache=<DIR>             Write artifacts to .../<DIR> rather than");
   UsageMsg("                                 .../dalvik-cache");
   UsageMsg("--staging-dir=<DIR>              Write temporary artifacts to <DIR> rather than");
   UsageMsg("                                 .../staging");
   UsageMsg("--zygote-arch=<STRING>           Zygote kind that overrides ro.zygote");
   UsageMsg("--boot-image-compiler-filter=<STRING>");
   UsageMsg("                                 Compiler filter for the boot image. Default: ");
   UsageMsg("                                 speed-profile");
   UsageMsg("--system-server-compiler-filter=<STRING>");
   UsageMsg("                                 Compiler filter that overrides");
   UsageMsg("                                 dalvik.vm.systemservercompilerfilter");
   UsageMsg("--minimal                        Generate a minimal boot image only.");

   exit(EX_USAGE);
 }

 }  // namespace

 int main(int argc, char** argv) {
   // odrefresh is launched by `init` which sets the umask of forked processed to
   // 077 (S_IRWXG | S_IRWXO). This blocks the ability to make files and directories readable
   // by others and prevents system_server from loading generated artifacts.
   umask(S_IWGRP | S_IWOTH);

   // Explicitly initialize logging (b/201042799).
   android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));

   OdrConfig config(argv[0]);
   int n = InitializeConfig(argc, argv, &config);
   argv += n;
   argc -= n;
   if (argc != 1) {
     ArgumentError("Expected 1 argument, but have %d.", argc);
   }
   GetSystemProperties(config.MutableSystemProperties());

   OdrMetrics metrics(config.GetArtifactDirectory());
   OnDeviceRefresh odr(config);

   std::string_view action(argv[0]);
   CompilationOptions compilation_options;
   if (action == "--check") {
     // Fast determination of whether artifacts are up to date.
     ExitCode exit_code = odr.CheckArtifactsAreUpToDate(metrics, &compilation_options);
     // Normally, `--check` should not write metrics. If compilation is not required, there's no need
     // to write metrics; if compilation is required, `--compile` will write metrics. Therefore,
     // `--check` should only write metrics when things went wrong.
     metrics.SetEnabled(exit_code != ExitCode::kOkay && exit_code != ExitCode::kCompilationRequired);
     return exit_code;
   } else if (action == "--compile") {
     ExitCode exit_code = odr.CheckArtifactsAreUpToDate(metrics, &compilation_options);
     if (exit_code != ExitCode::kCompilationRequired) {
       // No compilation required, so only write metrics when things went wrong.
       metrics.SetEnabled(exit_code != ExitCode::kOkay);
       return exit_code;
     }
     OdrCompilationLog compilation_log;
     if (!compilation_log.ShouldAttemptCompile(metrics.GetTrigger())) {
       LOG(INFO) << "Compilation skipped because it was attempted recently";
       return ExitCode::kOkay;
     }
     // Compilation required, so always write metrics.
     metrics.SetEnabled(true);
     ExitCode compile_result = odr.Compile(metrics, compilation_options);
     compilation_log.Log(metrics.GetArtApexVersion(),
                         metrics.GetArtApexLastUpdateMillis(),
                         metrics.GetTrigger(),
                         compile_result);
     return compile_result;
   } else if (action == "--force-compile") {
     // Clean-up existing files.
     if (!odr.RemoveArtifactsDirectory()) {
       metrics.SetStatus(OdrMetrics::Status::kIoError);
       return ExitCode::kCleanupFailed;
     }
     return odr.Compile(metrics,
                        CompilationOptions{
                            .compile_boot_classpath_for_isas = config.GetBootClasspathIsas(),
                            .system_server_jars_to_compile = odr.AllSystemServerJars(),
                        });
   } else if (action == "--help") {
     UsageHelp(argv[0]);
   } else {
     ArgumentError("Unknown argument: %s", action.data());
   }
 }
	/*
	* Copyright (C) 2020 The Android Open Source Project
	*
	* 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 <sys/stat.h>

	#include <string>
	#include <string_view>
	#include <unordered_map>

	#include "android-base/properties.h"
	#include "android-base/stringprintf.h"
	#include "android-base/strings.h"
	#include "arch/instruction_set.h"
	#include "base/file_utils.h"
	#include "base/globals.h"
	#include "base/stl_util.h"
	#include "odr_common.h"
	#include "odr_compilation_log.h"
	#include "odr_config.h"
	#include "odr_metrics.h"
	#include "odrefresh.h"
	#include "odrefresh/odrefresh.h"

	namespace {

	using ::android::base::GetProperty;
	using ::android::base::StartsWith;
	using ::art::odrefresh::CompilationOptions;
	using ::art::odrefresh::ExitCode;
	using ::art::odrefresh::kCheckedSystemPropertyPrefixes;
	using ::art::odrefresh::kIgnoredSystemProperties;
	using ::art::odrefresh::kSystemProperties;
	using ::art::odrefresh::kSystemPropertySystemServerCompilerFilterOverride;
	using ::art::odrefresh::OdrCompilationLog;
	using ::art::odrefresh::OdrConfig;
	using ::art::odrefresh::OdrMetrics;
	using ::art::odrefresh::OnDeviceRefresh;
	using ::art::odrefresh::QuotePath;
	using ::art::odrefresh::ShouldDisablePartialCompilation;
	using ::art::odrefresh::ShouldDisableRefresh;
	using ::art::odrefresh::SystemPropertyConfig;
	using ::art::odrefresh::SystemPropertyForeach;
	using ::art::odrefresh::ZygoteKind;

	void UsageMsgV(const char* fmt, va_list ap) {
	std::string error;
	android::base::StringAppendV(&error, fmt, ap);
	if (isatty(fileno(stderr))) {
	std::cerr << error << std::endl;
	} else {
	LOG(ERROR) << error;
	}
	}

	void UsageMsg(const char* fmt, ...) {
	va_list ap;
	va_start(ap, fmt);
	UsageMsgV(fmt, ap);
	va_end(ap);
	}

	NO_RETURN void ArgumentError(const char* fmt, ...) {
	va_list ap;
	va_start(ap, fmt);
	UsageMsgV(fmt, ap);
	va_end(ap);
	UsageMsg("Try '--help' for more information.");
	exit(EX_USAGE);
	}

	bool ParseZygoteKind(const char* input, ZygoteKind* zygote_kind) {
	std::string_view z(input);
	if (z == "zygote32") {
	*zygote_kind = ZygoteKind::kZygote32;
	return true;
	} else if (z == "zygote32_64") {
	*zygote_kind = ZygoteKind::kZygote32_64;
	return true;
	} else if (z == "zygote64_32") {
	*zygote_kind = ZygoteKind::kZygote64_32;
	return true;
	} else if (z == "zygote64") {
	*zygote_kind = ZygoteKind::kZygote64;
	return true;
	}
	return false;
	}

	std::string GetEnvironmentVariableOrDie(const char* name) {
	const char* value = getenv(name);
	LOG_ALWAYS_FATAL_IF(value == nullptr, "%s is not defined.", name);
	return value;
	}

	std::string GetEnvironmentVariableOrDefault(const char* name, std::string default_value) {
	const char* value = getenv(name);
	if (value == nullptr) {
	return default_value;
	}
	return value;
	}

	bool ArgumentMatches(std::string_view argument, std::string_view prefix, std::string* value) {
	if (android::base::StartsWith(argument, prefix)) {
	*value = std::string(argument.substr(prefix.size()));
	return true;
	}
	return false;
	}

	bool ArgumentEquals(std::string_view argument, std::string_view expected) {
	return argument == expected;
	}

	int InitializeConfig(int argc, char** argv, OdrConfig* config) {
	config->SetApexInfoListFile("/apex/apex-info-list.xml");
	config->SetArtBinDir(art::GetArtBinDir());
	config->SetBootClasspath(GetEnvironmentVariableOrDie("BOOTCLASSPATH"));
	config->SetDex2oatBootclasspath(GetEnvironmentVariableOrDie("DEX2OATBOOTCLASSPATH"));
	config->SetSystemServerClasspath(GetEnvironmentVariableOrDie("SYSTEMSERVERCLASSPATH"));
	config->SetStandaloneSystemServerJars(
	GetEnvironmentVariableOrDefault("STANDALONE_SYSTEMSERVER_JARS", /default_value=/""));
	config->SetIsa(art::kRuntimeISA);

	std::string zygote;
	int n = 1;
	for (; n < argc - 1; ++n) {
	const char* arg = argv[n];
	std::string value;
	if (ArgumentEquals(arg, "--compilation-os-mode")) {
	config->SetCompilationOsMode(true);
	} else if (ArgumentMatches(arg, "--dalvik-cache=", &value)) {
	art::OverrideDalvikCacheSubDirectory(value);
	config->SetArtifactDirectory(GetApexDataDalvikCacheDirectory(art::InstructionSet::kNone));
	} else if (ArgumentMatches(arg, "--zygote-arch=", &value)) {
	zygote = value;
	} else if (ArgumentMatches(arg, "--boot-image-compiler-filter=", &value)) {
	config->SetBootImageCompilerFilter(value);
	} else if (ArgumentMatches(arg, "--system-server-compiler-filter=", &value)) {
	config->SetSystemServerCompilerFilter(value);
	} else if (ArgumentMatches(arg, "--staging-dir=", &value)) {
	config->SetStagingDir(value);
	} else if (ArgumentEquals(arg, "--dry-run")) {
	config->SetDryRun();
	} else if (ArgumentEquals(arg, "--partial-compilation")) {
	config->SetPartialCompilation(true);
	} else if (ArgumentEquals(arg, "--no-refresh")) {
	config->SetRefresh(false);
	} else if (ArgumentEquals(arg, "--minimal")) {
	config->SetMinimal(true);
	} else {
	ArgumentError("Unrecognized argument: '%s'", arg);
	}
	}

	if (zygote.empty()) {
	// Use ro.zygote by default, if not overridden by --zygote-arch flag.
	zygote = GetProperty("ro.zygote", {});
	}
	ZygoteKind zygote_kind;
	if (!ParseZygoteKind(zygote.c_str(), &zygote_kind)) {
	LOG(FATAL) << "Unknown zygote: " << QuotePath(zygote);
	}
	config->SetZygoteKind(zygote_kind);

	if (config->GetSystemServerCompilerFilter().empty()) {
	std::string filter = GetProperty("dalvik.vm.systemservercompilerfilter", "");
	filter = GetProperty(kSystemPropertySystemServerCompilerFilterOverride, filter);
	config->SetSystemServerCompilerFilter(filter);
	}

	if (!config->HasPartialCompilation() &&
	ShouldDisablePartialCompilation(
	GetProperty("ro.build.version.security_patch", /default_value=/""))) {
	config->SetPartialCompilation(false);
	}

	if (ShouldDisableRefresh(GetProperty("ro.build.version.sdk", /default_value=/""))) {
	config->SetRefresh(false);
	}

	return n;
	}

	void GetSystemProperties(std::unordered_map<std::string, std::string>* system_properties) {
	SystemPropertyForeach([&](const char* name, const char* value) {
	if (strlen(value) == 0) {
	return;
	}
	for (const char* prefix : kCheckedSystemPropertyPrefixes) {
	if (StartsWith(name, prefix) && !art::ContainsElement(kIgnoredSystemProperties, name)) {
	(*system_properties)[name] = value;
	}
	}
	});
	for (const SystemPropertyConfig& system_property_config : *kSystemProperties.get()) {
	(*system_properties)[system_property_config.name] =
	GetProperty(system_property_config.name, system_property_config.default_value);
	}
	}

	NO_RETURN void UsageHelp(const char* argv0) {
	std::string name(android::base::Basename(argv0));
	UsageMsg("Usage: %s [OPTION...] ACTION", name.c_str());
	UsageMsg("On-device refresh tool for boot classpath and system server");
	UsageMsg("following an update of the ART APEX.");
	UsageMsg("");
	UsageMsg("Valid ACTION choices are:");
	UsageMsg("");
	UsageMsg("--check Check compilation artifacts are up-to-date based on metadata.");
	UsageMsg("--compile Compile boot classpath and system_server jars when necessary.");
	UsageMsg("--force-compile Unconditionally compile the bootclass path and system_server jars.");
	UsageMsg("--help Display this help information.");
	UsageMsg("");
	UsageMsg("Available OPTIONs are:");
	UsageMsg("");
	UsageMsg("--dry-run");
	UsageMsg("--partial-compilation Only generate artifacts that are out-of-date or");
	UsageMsg(" missing.");
	UsageMsg("--no-refresh Do not refresh existing artifacts.");
	UsageMsg("--compilation-os-mode Indicate that odrefresh is running in Compilation");
	UsageMsg(" OS.");
	UsageMsg("--dalvik-cache=<DIR> Write artifacts to .../<DIR> rather than");
	UsageMsg(" .../dalvik-cache");
	UsageMsg("--staging-dir=<DIR> Write temporary artifacts to <DIR> rather than");
	UsageMsg(" .../staging");
	UsageMsg("--zygote-arch=<STRING> Zygote kind that overrides ro.zygote");
	UsageMsg("--boot-image-compiler-filter=<STRING>");
	UsageMsg(" Compiler filter for the boot image. Default: ");
	UsageMsg(" speed-profile");
	UsageMsg("--system-server-compiler-filter=<STRING>");
	UsageMsg(" Compiler filter that overrides");
	UsageMsg(" dalvik.vm.systemservercompilerfilter");
	UsageMsg("--minimal Generate a minimal boot image only.");

	exit(EX_USAGE);
	}

	} // namespace

	int main(int argc, char** argv) {
	// odrefresh is launched by `init` which sets the umask of forked processed to
	// 077 (S_IRWXG \| S_IRWXO). This blocks the ability to make files and directories readable
	// by others and prevents system_server from loading generated artifacts.
	umask(S_IWGRP \| S_IWOTH);

	// Explicitly initialize logging (b/201042799).
	android::base::InitLogging(argv, android::base::LogdLogger(android::base::SYSTEM));

	OdrConfig config(argv[0]);
	int n = InitializeConfig(argc, argv, &config);
	argv += n;
	argc -= n;
	if (argc != 1) {
	ArgumentError("Expected 1 argument, but have %d.", argc);
	}
	GetSystemProperties(config.MutableSystemProperties());

	OdrMetrics metrics(config.GetArtifactDirectory());
	OnDeviceRefresh odr(config);

	std::string_view action(argv[0]);
	CompilationOptions compilation_options;
	if (action == "--check") {
	// Fast determination of whether artifacts are up to date.
	ExitCode exit_code = odr.CheckArtifactsAreUpToDate(metrics, &compilation_options);
	// Normally, `--check` should not write metrics. If compilation is not required, there's no need
	// to write metrics; if compilation is required, `--compile` will write metrics. Therefore,
	// `--check` should only write metrics when things went wrong.
	metrics.SetEnabled(exit_code != ExitCode::kOkay && exit_code != ExitCode::kCompilationRequired);
	return exit_code;
	} else if (action == "--compile") {
	ExitCode exit_code = odr.CheckArtifactsAreUpToDate(metrics, &compilation_options);
	if (exit_code != ExitCode::kCompilationRequired) {
	// No compilation required, so only write metrics when things went wrong.
	metrics.SetEnabled(exit_code != ExitCode::kOkay);
	return exit_code;
	}
	OdrCompilationLog compilation_log;
	if (!compilation_log.ShouldAttemptCompile(metrics.GetTrigger())) {
	LOG(INFO) << "Compilation skipped because it was attempted recently";
	return ExitCode::kOkay;
	}
	// Compilation required, so always write metrics.
	metrics.SetEnabled(true);
	ExitCode compile_result = odr.Compile(metrics, compilation_options);
	compilation_log.Log(metrics.GetArtApexVersion(),
	metrics.GetArtApexLastUpdateMillis(),
	metrics.GetTrigger(),
	compile_result);
	return compile_result;
	} else if (action == "--force-compile") {
	// Clean-up existing files.
	if (!odr.RemoveArtifactsDirectory()) {
	metrics.SetStatus(OdrMetrics::Status::kIoError);
	return ExitCode::kCleanupFailed;
	}
	return odr.Compile(metrics,
	CompilationOptions{
	.compile_boot_classpath_for_isas = config.GetBootClasspathIsas(),
	.system_server_jars_to_compile = odr.AllSystemServerJars(),
	});
	} else if (action == "--help") {
	UsageHelp(argv[0]);
	} else {
	ArgumentError("Unknown argument: %s", action.data());
	}
	}