From 6ca16dd2008fe3bcea533904eb39202bdabdaebd Mon Sep 17 00:00:00 2001
From: Roberto Hueso Gómez <rhueso@soleta.eu>
Date: Fri, 8 May 2020 17:34:41 +0200
Subject: Poweroff when no VM and no jobs are running

This patch calls poweroff in virtual mode when no VM is running and no jobs are
being executed. This is useful when the guest OS shutdowns so that the host OS
does not continue to run.
---
 src/ogRest.py               | 15 ++++++++++++++-
 src/virtual/ogOperations.py | 26 ++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/ogRest.py b/src/ogRest.py
index fed998e..abe05c1 100644
--- a/src/ogRest.py
+++ b/src/ogRest.py
@@ -19,7 +19,7 @@ import signal
 from src.restRequest import *
 
 from src.linux.ogOperations import OgLinuxOperations
-from src.virtual.ogOperations import OgVirtualOperations
+from src.virtual.ogOperations import OgVirtualOperations, OgVM
 
 class ThreadState(Enum):
 	IDLE = 0
@@ -97,6 +97,17 @@ class ogThread():
 
 		ogRest.state = ThreadState.IDLE
 
+	def check_vm_state_loop(ogRest):
+		POLLING_WAIT_TIME = 3
+		while True:
+			state = ogRest.operations.check_vm_state()
+			installed_os = ogRest.operations.get_installed_os()
+			if state == OgVM.State.STOPPED and \
+			   ogRest.state == ThreadState.IDLE and \
+			   len(installed_os) > 0:
+				ogRest.operations.poweroff_host()
+			time.sleep(POLLING_WAIT_TIME)
+
 	def poweroff(ogRest):
 		time.sleep(2)
 		ogRest.operations.poweroff()
@@ -242,6 +253,8 @@ class ogRest():
 			self.operations = OgLinuxOperations()
 		elif self.mode == 'virtual':
 			self.operations = OgVirtualOperations()
+			threading.Thread(target=ogThread.check_vm_state_loop,
+					 args=(self,)).start()
 		else:
 			raise ValueError('Mode not supported.')
 
diff --git a/src/virtual/ogOperations.py b/src/virtual/ogOperations.py
index b13aeb4..1b4a871 100644
--- a/src/virtual/ogOperations.py
+++ b/src/virtual/ogOperations.py
@@ -19,12 +19,17 @@ import pathlib
 import re
 import math
 import sys
+import enum
 
 class OgVM:
     DEFAULT_CPU = 'host'
     DEFAULT_VGA = 'std'
     DEFAULT_QMP_PORT = 4444
 
+    class State(enum.Enum):
+        STOPPED = 0
+        RUNNING = 1
+
     def __init__(self,
                  partition_path,
                  memory=None,
@@ -134,6 +139,7 @@ class OgVirtualOperations:
         self.OG_PATH = os.path.dirname(os.path.realpath(sys.argv[0]))
         self.OG_IMAGES_PATH = f'{self.OG_PATH}/images'
         self.OG_PARTITIONS_PATH = f'{self.OG_PATH}/partitions'
+        self.OG_PARTITIONS_CFG_PATH = f'{self.OG_PATH}/partitions.json'
 
         if not os.path.exists(self.OG_IMAGES_PATH):
             os.mkdir(self.OG_IMAGES_PATH, mode=0o755)
@@ -168,6 +174,26 @@ class OgVirtualOperations:
         except:
             pass
 
+    def check_vm_state(self):
+        try:
+            qmp = OgQMP(self.IP, self.VIRTUAL_PORT)
+            qmp.disconnect()
+            return OgVM.State.RUNNING
+        except:
+            return OgVM.State.STOPPED
+
+    def get_installed_os(self):
+        installed_os = {}
+        try:
+            with open(self.OG_PARTITIONS_CFG_PATH, 'r') as f:
+                cfg = json.loads(f.read())
+            for part in cfg['partition_setup']:
+                if len(part['os']) > 0:
+                    installed_os[part['os']] = (part['disk'], part['partition'])
+        except:
+            pass
+        return installed_os
+
     def execCMD(self, request, ogRest):
         # TODO Implement.
         raise NotImplementedError
-- 
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