Disable Me2Me host controls on unsupported Linux systems.

remoting/host/setup/daemon_controller_delegate_linux.cc

Index: remoting/host/setup/daemon_controller_delegate_linux.cc
diff --git a/remoting/host/setup/daemon_controller_delegate_linux.cc b/remoting/host/setup/daemon_controller_delegate_linux.cc
index d323e1c66e8a23030a26ccf7ebfe2aa8f6b6e7d6..7e7804612ff43616d6141b8aadb24b4decffc464 100644
--- a/remoting/host/setup/daemon_controller_delegate_linux.cc
+++ b/remoting/host/setup/daemon_controller_delegate_linux.cc
@@ -114,8 +114,7 @@ bool RunHostScriptWithTimeout(
   return true;
 }
 
-bool RunHostScript(const std::vector<std::string>& args,
-                          int* exit_code) {
+bool RunHostScript(const std::vector<std::string>& args, int* exit_code) {
   return RunHostScriptWithTimeout(
       args, base::TimeDelta::FromMilliseconds(kDaemonTimeoutMs), exit_code);
 }
@@ -129,20 +128,43 @@ DaemonControllerDelegateLinux::~DaemonControllerDelegateLinux() {
 }
 
 DaemonController::State DaemonControllerDelegateLinux::GetState() {
-  std::vector<std::string> args;
-  args.push_back("--check-running");
+  base::FilePath script_path;
+  if (!GetScriptPath(&script_path)) {
+    return DaemonController::STATE_NOT_IMPLEMENTED;
+  }
+  CommandLine command_line(script_path);
+  command_line.AppendArg("--get-status");
+
+  std::string status;
   int exit_code = 0;
-  if (!RunHostScript(args, &exit_code)) {
+  bool result =
+      base::GetAppOutputWithExitCode(command_line, &status, &exit_code);
+  if (!result) {
     // TODO(jamiewalch): When we have a good story for installing, return
     // NOT_INSTALLED rather than NOT_IMPLEMENTED (the former suppresses
     // the relevant UI in the web-app).
     return DaemonController::STATE_NOT_IMPLEMENTED;
   }
 
-  if (exit_code == 0) {
+  if (exit_code != 0) {
+    LOG(ERROR) << "Failed to run \"" << command_line.GetCommandLineString()
+               << "\". Exit code: " << exit_code;
+    return DaemonController::STATE_UNKNOWN;
+  }
+
+  TrimWhitespaceASCII(status, TRIM_ALL, &status);
+
+  if (status == "STARTED") {
     return DaemonController::STATE_STARTED;
-  } else {
+  } else if (status == "STOPPED") {
     return DaemonController::STATE_STOPPED;
+  } else if (status == "NOT_IMPLEMENTED") {
+    return DaemonController::STATE_NOT_IMPLEMENTED;
+  } else {
+    LOG(ERROR) << "Unknown status string returned from  \""
+               << command_line.GetCommandLineString()
+               << "\": " << status;
+    return DaemonController::STATE_UNKNOWN;
   }
 }