Merge "init: Support custom shutdown actions"

am: c1bc4241f8

Change-Id: I6bb1789dbc5edbb10f2f4d712e9ca83e6302fdf4

init/action.cpp

@@ -326,6 +326,13 @@ void ActionManager::DumpState() const {
     }
 }
 
+void ActionManager::ClearQueue() {
+    // We are shutting down so don't claim the oneshot builtin actions back
+    current_executing_actions_ = {};
+    event_queue_ = {};
+    current_command_ = 0;
+}
+
 bool ActionParser::ParseSection(std::vector<std::string>&& args, const std::string& filename,
                                 int line, std::string* err) {
     std::vector<std::string> triggers(args.begin() + 1, args.end());

init/action.h

@@ -104,6 +104,7 @@ class ActionManager {
     void ExecuteOneCommand();
     bool HasMoreCommands() const;
     void DumpState() const;
+    void ClearQueue();
 
   private:
     ActionManager(ActionManager const&) = delete;

init/builtins.cpp

@@ -119,7 +119,7 @@ static int reboot_into_recovery(const std::vector<std::string>& options) {
         LOG(ERROR) << "failed to set bootloader message: " << err;
         return -1;
     }
-    DoReboot(ANDROID_RB_RESTART2, "reboot", "recovery", false);
+    property_set("sys.powerctl", "reboot,recovery");
     return 0;
 }
 

init/init.cpp

@@ -94,6 +94,7 @@ static int epoll_fd = -1;
 static std::unique_ptr<Timer> waiting_for_prop(nullptr);
 static std::string wait_prop_name;
 static std::string wait_prop_value;
+static bool shutting_down;
 
 void DumpState() {
     ServiceManager::GetInstance().DumpState();
@@ -158,21 +159,31 @@ bool start_waiting_for_property(const char *name, const char *value)
     return true;
 }
 
+void ResetWaitForProp() {
+    wait_prop_name.clear();
+    wait_prop_value.clear();
+    waiting_for_prop.reset();
+}
+
 void property_changed(const std::string& name, const std::string& value) {
     // If the property is sys.powerctl, we bypass the event queue and immediately handle it.
     // This is to ensure that init will always and immediately shutdown/reboot, regardless of
     // if there are other pending events to process or if init is waiting on an exec service or
     // waiting on a property.
-    if (name == "sys.powerctl") HandlePowerctlMessage(value);
+    // In non-thermal-shutdown case, 'shutdown' trigger will be fired to let device specific
+    // commands to be executed.
+    if (name == "sys.powerctl") {
+        if (HandlePowerctlMessage(value)) {
+            shutting_down = true;
+        }
+    }
 
     if (property_triggers_enabled) ActionManager::GetInstance().QueuePropertyChange(name, value);
 
     if (waiting_for_prop) {
         if (wait_prop_name == name && wait_prop_value == value) {
-            wait_prop_name.clear();
-            wait_prop_value.clear();
             LOG(INFO) << "Wait for property took " << *waiting_for_prop;
-            waiting_for_prop.reset();
+            ResetWaitForProp();
         }
     }
 }
@@ -1166,7 +1177,7 @@ int main(int argc, char** argv) {
             am.ExecuteOneCommand();
         }
         if (!(waiting_for_prop || sm.IsWaitingForExec())) {
-            restart_processes();
+            if (!shutting_down) restart_processes();
 
             // If there's a process that needs restarting, wake up in time for that.
             if (process_needs_restart_at != 0) {

init/init.h

@@ -44,6 +44,8 @@ bool start_waiting_for_property(const char *name, const char *value);
 
 void DumpState();
 
+void ResetWaitForProp();
+
 }  // namespace init
 }  // namespace android
 

init/reboot.cpp

@@ -49,6 +49,7 @@
 #include <private/android_filesystem_config.h>
 
 #include "capabilities.h"
+#include "init.h"
 #include "property_service.h"
 #include "service.h"
 
@@ -490,6 +491,9 @@ bool HandlePowerctlMessage(const std::string& command) {
         }
     } else if (command == "thermal-shutdown") {  // no additional parameter allowed
         cmd = ANDROID_RB_THERMOFF;
+        // Do not queue "shutdown" trigger since we want to shutdown immediately
+        DoReboot(cmd, command, reboot_target, run_fsck);
+        return true;
     } else {
         command_invalid = true;
     }
@@ -498,7 +502,26 @@ bool HandlePowerctlMessage(const std::string& command) {
         return false;
     }
 
-    DoReboot(cmd, command, reboot_target, run_fsck);
+    LOG(INFO) << "Clear action queue and start shutdown trigger";
+    ActionManager::GetInstance().ClearQueue();
+    // Queue shutdown trigger first
+    ActionManager::GetInstance().QueueEventTrigger("shutdown");
+    // Queue built-in shutdown_done
+    auto shutdown_handler = [cmd, command, reboot_target,
+                             run_fsck](const std::vector<std::string>&) {
+        DoReboot(cmd, command, reboot_target, run_fsck);
+        return 0;
+    };
+    ActionManager::GetInstance().QueueBuiltinAction(shutdown_handler, "shutdown_done");
+
+    // Skip wait for prop if it is in progress
+    ResetWaitForProp();
+
+    // Skip wait for exec if it is in progress
+    if (ServiceManager::GetInstance().IsWaitingForExec()) {
+        ServiceManager::GetInstance().ClearExecWait();
+    }
+
     return true;
 }
 

init/service.cpp

@@ -1152,6 +1152,15 @@ void ServiceManager::ReapAnyOutstandingChildren() {
     }
 }
 
+void ServiceManager::ClearExecWait() {
+    // Clear EXEC flag if there is one pending
+    // And clear the wait flag
+    for (const auto& s : services_) {
+        s->UnSetExec();
+    }
+    exec_waiter_.reset();
+}
+
 bool ServiceParser::ParseSection(std::vector<std::string>&& args, const std::string& filename,
                                  int line, std::string* err) {
     if (args.size() < 3) {

init/service.h

@@ -89,6 +89,7 @@ class Service {
     void DumpState() const;
     void SetShutdownCritical() { flags_ |= SVC_SHUTDOWN_CRITICAL; }
     bool IsShutdownCritical() const { return (flags_ & SVC_SHUTDOWN_CRITICAL) != 0; }
+    void UnSetExec() { flags_ &= ~SVC_EXEC; }
 
     const std::string& name() const { return name_; }
     const std::set<std::string>& classnames() const { return classnames_; }
@@ -186,7 +187,7 @@ class Service {
 };
 
 class ServiceManager {
-public:
+  public:
     static ServiceManager& GetInstance();
 
     // Exposed for testing
@@ -208,8 +209,9 @@ public:
     void ReapAnyOutstandingChildren();
     void RemoveService(const Service& svc);
     void DumpState() const;
+    void ClearExecWait();
 
-private:
+  private:
     // Cleans up a child process that exited.
     // Returns true iff a children was cleaned up.
     bool ReapOneProcess();

init/util.cpp

@@ -370,6 +370,7 @@ bool expand_props(const std::string& src, std::string* dst) {
 
 void panic() {
     LOG(ERROR) << "panic: rebooting to bootloader";
+    // Do not queue "shutdown" trigger since we want to shutdown immediately
     DoReboot(ANDROID_RB_RESTART2, "reboot", "bootloader", false);
 }
 

rootdir/init.rc

@@ -678,6 +678,10 @@ on property:security.perf_harden=0
 on property:security.perf_harden=1
     write /proc/sys/kernel/perf_event_paranoid 3
 
+# on shutdown
+# In device's init.rc, this trigger can be used to do device-specific actions
+# before shutdown. e.g disable watchdog and mask error handling
+
 ## Daemon processes to be run by init.
 ##
 service ueventd /sbin/ueventd