Add power_off command in standby extension

This commit adds a new command power_off to
standby extension which runs shutdown -h now
on the system. This commit also adds mappings
for /proc and /sys in cloud-config.yml for the
agent service spawned.

Partial-Bug: #1451310
Change-Id: I2a5f984af26bbbe03002bb8c367c8c6af8d91434

imagebuild/coreos/oem/cloud-config.yml

@@ -58,6 +58,8 @@ coreos:
                                           --machine=ironic_python_agent \
                                           --bind=/dev:/dev \
                                           --bind=/dev/pts:/dev/pts \
+                                          --bind=/proc:/proc \
+                                          --bind=/sys:/sys \
                                           --bind=/usr/share/oem:/mnt \
                                           --user=root \
                                           --keep-unit \

ironic_python_agent/extensions/standby.py

@@ -238,13 +238,21 @@ class StandbyExtension(base.BaseAgentExtension):
         return 'image ({0}) written to device {1}'.format(image_info['id'],
                                                           device)
 
-    @base.async_command('run_image')
-    def run_image(self):
-        script = _path_to_script('shell/reboot.sh')
-        LOG.info('Rebooting system')
-        command = ['/bin/bash', script]
+    def _run_shutdown_script(self, parameter):
+        script = _path_to_script('shell/shutdown.sh')
+        command = ['/bin/bash', script, parameter]
         # this should never return if successful
         try:
             stdout, stderr = utils.execute(*command, check_exit_code=[0])
         except processutils.ProcessExecutionError as e:
             raise errors.SystemRebootError(e.exit_code, e.stdout, e.stderr)
+
+    @base.async_command('run_image')
+    def run_image(self):
+        LOG.info('Rebooting system')
+        self._run_shutdown_script('-r')
+
+    @base.async_command('power_off')
+    def power_off(self):
+        LOG.info('Powering off system')
+        self._run_shutdown_script('-h')

ironic_python_agent/shell/shutdown.sh

@@ -22,4 +22,8 @@ set -e
 echo "1" > /proc/sys/kernel/sysrq
 
 echo "s" > /proc/sysrq-trigger
-echo "b" > /proc/sysrq-trigger
+if [[ $1 = '-h' ]]; then
+    echo "o" > /proc/sysrq-trigger
+elif [[ $1 = '-r' ]]; then
+    echo "b" > /proc/sysrq-trigger
+fi

ironic_python_agent/tests/extensions/standby.py

@@ -451,8 +451,8 @@ class TestStandbyExtension(test_base.BaseTestCase):
 
     @mock.patch('ironic_python_agent.utils.execute', autospec=True)
     def test_run_image(self, execute_mock):
-        script = standby._path_to_script('shell/reboot.sh')
-        command = ['/bin/bash', script]
+        script = standby._path_to_script('shell/shutdown.sh')
+        command = ['/bin/bash', script, '-r']
         execute_mock.return_value = ('', '')
 
         success_result = self.agent_extension.run_image()
@@ -474,3 +474,25 @@ class TestStandbyExtension(test_base.BaseTestCase):
     def test_path_to_script(self):
         script = standby._path_to_script('shell/reboot.sh')
         self.assertTrue(script.endswith('extensions/../shell/reboot.sh'))
+
+    @mock.patch('ironic_python_agent.utils.execute', autospec=True)
+    def test_power_off(self, execute_mock):
+        script = standby._path_to_script('shell/shutdown.sh')
+        command = ['/bin/bash', script, '-h']
+        execute_mock.return_value = ('', '')
+
+        success_result = self.agent_extension.power_off()
+        success_result.join()
+
+        execute_mock.assert_called_once_with(*command, check_exit_code=[0])
+        self.assertEqual('SUCCEEDED', success_result.command_status)
+
+        execute_mock.reset_mock()
+        execute_mock.return_value = ('', '')
+        execute_mock.side_effect = processutils.ProcessExecutionError
+
+        failed_result = self.agent_extension.power_off()
+        failed_result.join()
+
+        execute_mock.assert_called_once_with(*command, check_exit_code=[0])
+        self.assertEqual('FAILED', failed_result.command_status)