Consolidate the wait in recovery's reboot

After a reboot function call, we should always wait for it to finish
without executing other instructions.

Bug: 151110322
Test: build
Change-Id: I1dda291a0835ff96df7eaf42eba1a38267a3beeb
(cherry picked from commit 00c4aba9bf428717fc00e26a03e97401eca76ee8)

otautil/include/otautil/sysutil.h

@@ -103,7 +103,7 @@ class MemMapping {
 
 // Reboots the device into the specified target, by additionally handling quiescent reboot mode.
 // All unknown targets reboot into Android.
-bool Reboot(std::string_view target);
+[[noreturn]] void Reboot(std::string_view target);
 
 // Triggers a shutdown.
 bool Shutdown(std::string_view target);

otautil/sysutil.cpp

@@ -219,14 +219,18 @@ MemMapping::~MemMapping() {
   ranges_.clear();
 }
 
-bool Reboot(std::string_view target) {
+void Reboot(std::string_view target) {
   std::string cmd = "reboot," + std::string(target);
   // Honor the quiescent mode if applicable.
   if (target != "bootloader" && target != "fastboot" &&
       android::base::GetBoolProperty("ro.boot.quiescent", false)) {
     cmd += ",quiescent";
   }
-  return android::base::SetProperty(ANDROID_RB_PROPERTY, cmd);
+  if (!android::base::SetProperty(ANDROID_RB_PROPERTY, cmd)) {
+    LOG(FATAL) << "Reboot failed";
+  }
+
+  while (true) pause();
 }
 
 bool Shutdown(std::string_view target) {

recovery.cpp

@@ -781,13 +781,7 @@ Device::BuiltinAction start_recovery(Device* device, const std::vector<std::stri
           ui->Print("Retry attempt %d\n", retry_count);
 
           // Reboot back into recovery to retry the update.
-          if (!Reboot("recovery")) {
-            ui->Print("Reboot failed\n");
-          } else {
-            while (true) {
-              pause();
-            }
-          }
+          Reboot("recovery");
         }
         // If this is an eng or userdebug build, then automatically
         // turn the text display on if the script fails so the error

recovery_ui/ui.cpp

@@ -375,9 +375,6 @@ void RecoveryUI::ProcessKey(int key_code, int updown) {
       case RecoveryUI::REBOOT:
         if (reboot_enabled) {
           Reboot("userrequested,recovery,ui");
-          while (true) {
-            pause();
-          }
         }
         break;
 

updater/install.cpp

@@ -733,7 +733,6 @@ Value* RebootNowFn(const char* name, State* state, const std::vector<std::unique
 
   Reboot(property);
 
-  sleep(5);
   return ErrorAbort(state, kRebootFailure, "%s() failed to reboot", name);
 }