Set log level on startup from environment variable

src/anbox/daemon.cpp

@@ -39,6 +39,12 @@ Daemon::Daemon()
      .command(std::make_shared<cmds::SessionManager>())
      .command(std::make_shared<cmds::Launch>())
      .command(std::make_shared<cmds::ContainerManager>());
+
+  Log().Init(anbox::Logger::Severity::kWarning);
+
+  const auto log_level = utils::get_env_value("ANBOX_LOG_LEVEL", "");
+  if (!log_level.empty())
+    Log().SetSeverity(log_level);
 }
 
 int Daemon::Run(const std::vector<std::string> &arguments) try {

src/anbox/logger.cpp

@@ -60,6 +60,10 @@ struct BoostLogLogger : public anbox::Logger {
     initialized_ = true;
   }
 
+  void SetSeverity(const Severity& severity) override {
+    severity_ = severity;
+  }
+
   void Log(Severity severity, const std::string& message, const boost::optional<Location>& loc) override {
     if (!initialized_) Init();
 
@@ -103,6 +107,21 @@ void SetInstance(const std::shared_ptr<anbox::Logger>& logger) {
 }
 namespace anbox {
 
+void Logger::SetSeverity(const std::string& severity) {
+  if (severity == "trace")
+    SetSeverity(Severity::kTrace);
+  else if (severity == "debug")
+    SetSeverity(Severity::kDebug);
+  else if (severity == "info")
+    SetSeverity(Severity::kInfo);
+  else if (severity == "warning")
+    SetSeverity(Severity::kWarning);
+  else if (severity == "error")
+    SetSeverity(Severity::kError);
+  else if (severity == "fatal")
+    SetSeverity(Severity::kFatal);
+}
+
 void Logger::Trace(const std::string& message,
                    const boost::optional<Location>& location) {
   Log(Severity::kTrace, message, location);