[daemon] Handle forced stop command

src/daemon/daemon.cpp

@@ -1806,6 +1806,8 @@ try // clang-format on
         std::function<grpc::Status(VirtualMachine&)> operation;
         if (request->cancel_shutdown())
             operation = std::bind(&Daemon::cancel_vm_shutdown, this, std::placeholders::_1);
+        else if (request->force_stop())
+            operation = std::bind(&Daemon::switch_off_vm, this, std::placeholders::_1);
         else
             operation = std::bind(&Daemon::shutdown_vm, this, std::placeholders::_1,
                                   std::chrono::minutes(request->time_minutes()));
@@ -2405,6 +2407,26 @@ grpc::Status mp::Daemon::shutdown_vm(VirtualMachine& vm, const std::chrono::mill
     return grpc::Status::OK;
 }
 
+grpc::Status mp::Daemon::switch_off_vm(VirtualMachine& vm)
+{
+    const auto& name = vm.vm_name;
+    const auto& state = vm.current_state();
+
+    using St = VirtualMachine::State;
+    const auto skip_states = {St::off, St::stopped};
+
+    if (std::none_of(cbegin(skip_states), cend(skip_states), [&state](const auto& st) { return state == st; }))
+    {
+        delayed_shutdown_instances.erase(name);
+
+        vm.stop(true);
+    }
+    else
+        mpl::log(mpl::Level::debug, category, fmt::format("instance \"{}\" does not need stopping", name));
+
+    return grpc::Status::OK;
+}
+
 grpc::Status mp::Daemon::cancel_vm_shutdown(const VirtualMachine& vm)
 {
     auto it = delayed_shutdown_instances.find(vm.vm_name);

src/daemon/daemon.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2017-2020 Canonical, Ltd.
+ * Copyright (C) 2017-2021 Canonical, Ltd.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -147,6 +147,7 @@ public slots:
                    std::promise<grpc::Status>* status_promise, bool start);
     grpc::Status reboot_vm(VirtualMachine& vm);
     grpc::Status shutdown_vm(VirtualMachine& vm, const std::chrono::milliseconds delay);
+    grpc::Status switch_off_vm(VirtualMachine& vm);
     grpc::Status cancel_vm_shutdown(const VirtualMachine& vm);
     grpc::Status cmd_vms(const std::vector<std::string>& tgts, std::function<grpc::Status(VirtualMachine&)> cmd);
     void install_sshfs(VirtualMachine* vm, const std::string& name);