/*
* Copyright (C) 2015 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 "action.h"
#include <android-base/chrono_utils.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include "util.h"
using android::base::Join;
namespace android {
namespace init {
Result<Success> RunBuiltinFunction(const BuiltinFunction& function,
const std::vector<std::string>& args,
const std::string& context) {
auto builtin_arguments = BuiltinArguments(context);
builtin_arguments.args.resize(args.size());
builtin_arguments.args[0] = args[0];
for (std::size_t i = 1; i < args.size(); ++i) {
if (!expand_props(args[i], &builtin_arguments.args[i])) {
return Error() << "cannot expand '" << args[i] << "'";
}
}
return function(builtin_arguments);
}
Command::Command(BuiltinFunction f, bool execute_in_subcontext,
const std::vector<std::string>& args, int line)
: func_(std::move(f)), execute_in_subcontext_(execute_in_subcontext), args_(args), line_(line) {}
Result<Success> Command::InvokeFunc(Subcontext* subcontext) const {
if (subcontext) {
if (execute_in_subcontext_) {
return subcontext->Execute(args_);
}
auto expanded_args = subcontext->ExpandArgs(args_);
if (!expanded_args) {
return expanded_args.error();
}
return RunBuiltinFunction(func_, *expanded_args, subcontext->context());
}
return RunBuiltinFunction(func_, args_, kInitContext);
}
std::string Command::BuildCommandString() const {
return Join(args_, ' ');
}
Action::Action(bool oneshot, Subcontext* subcontext, const std::string& filename, int line,
const std::string& event_trigger,
const std::map<std::string, std::string>& property_triggers)
: property_triggers_(property_triggers),
event_trigger_(event_trigger),
oneshot_(oneshot),
subcontext_(subcontext),
filename_(filename),
line_(line) {}
const KeywordFunctionMap* Action::function_map_ = nullptr;
Result<Success> Action::AddCommand(const std::vector<std::string>& args, int line) {
if (!function_map_) {
return Error() << "no function map available";
}
auto function = function_map_->FindFunction(args);
if (!function) return Error() << function.error();
commands_.emplace_back(function->second, function->first, args, line);
return Success();
}
void Action::AddCommand(BuiltinFunction f, const std::vector<std::string>& args, int line) {
commands_.emplace_back(f, false, args, line);
}
std::size_t Action::NumCommands() const {
return commands_.size();
}
void Action::ExecuteOneCommand(std::size_t command) const {
// We need a copy here since some Command execution may result in
// changing commands_ vector by importing .rc files through parser
Command cmd = commands_[command];
ExecuteCommand(cmd);
}
void Action::ExecuteAllCommands() const {
for (const auto& c : commands_) {
ExecuteCommand(c);
}
}
void Action::ExecuteCommand(const Command& command) const {
android::base::Timer t;
auto result = command.InvokeFunc(subcontext_);
auto duration = t.duration();
// There are many legacy paths in rootdir/init.rc that will virtually never exist on a new
// device, such as '/sys/class/leds/jogball-backlight/brightness'. As of this writing, there
// are 198 such failures on bullhead. Instead of spamming the log reporting them, we do not
// report such failures unless we're running at the DEBUG log level.
bool report_failure = !result.has_value();
if (report_failure && android::base::GetMinimumLogSeverity() > android::base::DEBUG &&
result.error_errno() == ENOENT) {
report_failure = false;
}
// Any action longer than 50ms will be warned to user as slow operation
if (report_failure || duration > 50ms ||
android::base::GetMinimumLogSeverity() <= android::base::DEBUG) {
std::string trigger_name = BuildTriggersString();
std::string cmd_str = command.BuildCommandString();
LOG(INFO) << "Command '" << cmd_str << "' action=" << trigger_name << " (" << filename_
<< ":" << command.line() << ") took " << duration.count() << "ms and "
<< (result ? "succeeded" : "failed: " + result.error_string());
}
}
// This function checks that all property triggers are satisfied, that is
// for each (name, value) in property_triggers_, check that the current
// value of the property 'name' == value.
//
// It takes an optional (name, value) pair, which if provided must
// be present in property_triggers_; it skips the check of the current
// property value for this pair.
bool Action::CheckPropertyTriggers(const std::string& name,
const std::string& value) const {
if (property_triggers_.empty()) {
return true;
}
bool found = name.empty();
for (const auto& [trigger_name, trigger_value] : property_triggers_) {
if (trigger_name == name) {
if (trigger_value != "*" && trigger_value != value) {
return false;
} else {
found = true;
}
} else {
std::string prop_val = android::base::GetProperty(trigger_name, "");
if (prop_val.empty() || (trigger_value != "*" && trigger_value != prop_val)) {
return false;
}
}
}
return found;
}
bool Action::CheckEvent(const EventTrigger& event_trigger) const {
return event_trigger == event_trigger_ && CheckPropertyTriggers();
}
bool Action::CheckEvent(const PropertyChange& property_change) const {
const auto& [name, value] = property_change;
return event_trigger_.empty() && CheckPropertyTriggers(name, value);
}
bool Action::CheckEvent(const BuiltinAction& builtin_action) const {
return this == builtin_action;
}
std::string Action::BuildTriggersString() const {
std::vector<std::string> triggers;
for (const auto& [trigger_name, trigger_value] : property_triggers_) {
triggers.emplace_back(trigger_name + '=' + trigger_value);
}
if (!event_trigger_.empty()) {
triggers.emplace_back(event_trigger_);
}
return Join(triggers, " && ");
}
void Action::DumpState() const {
std::string trigger_name = BuildTriggersString();
LOG(INFO) << "on " << trigger_name;
for (const auto& c : commands_) {
std::string cmd_str = c.BuildCommandString();
LOG(INFO) << " " << cmd_str;
}
}
} // namespace init
} // namespace android
