Reboot and Poweroff fails with coreos IPA image

The CoreOS IPA images do not support poweroff/reboot due to running in a
chroot. For this case, we fall back to forcing poweroff or reboot via
sysrq commands

Change-Id: I75d68b6308beba299d043e43a5fa1671b6ef3ada
Closes-Bug: #1628367

3 files changed, 46 insertions, 4 deletions

diff --git a/ironic_python_agent/extensions/standby.py b/ironic_python_agent/extensions/standby.py
index 1ba396ea..637e4012 100644
--- a/ironic_python_agent/extensions/standby.py
+++ b/ironic_python_agent/extensions/standby.py
@@ -499,7 +499,15 @@ class StandbyExtension(base.BaseAgentExtension):
         except errors.CommandExecutionError as e:
             LOG.warning('Failed to sync file system buffers: % s', e)
         try:
-            utils.execute(command, check_exit_code=[0])
+            _, stderr = utils.execute(command, use_standard_locale=True,
+                                      check_exit_code=[0])
+            if 'ignoring request.' in stderr:
+                LOG.debug('%s command failed with error %s, '
+                          'falling back to sysrq-trigger.', command, stderr)
+                if command == 'poweroff':
+                    utils.execute("echo o > /proc/sysrq-trigger", shell=True)
+                elif command == 'reboot':
+                    utils.execute("echo b > /proc/sysrq-trigger", shell=True)
         except processutils.ProcessExecutionError as e:
             raise errors.SystemRebootError(e.exit_code, e.stdout, e.stderr)
 
diff --git a/ironic_python_agent/tests/unit/extensions/test_standby.py b/ironic_python_agent/tests/unit/extensions/test_standby.py
index b76dd596..6a98dd31 100644
--- a/ironic_python_agent/tests/unit/extensions/test_standby.py
+++ b/ironic_python_agent/tests/unit/extensions/test_standby.py
@@ -679,7 +679,34 @@ class TestStandbyExtension(test_base.BaseTestCase):
 
         self.agent_extension._run_shutdown_command('poweroff')
         calls = [mock.call('sync'),
-                 mock.call('poweroff', check_exit_code=[0])]
+                 mock.call('poweroff', use_standard_locale=True,
+                           check_exit_code=[0])]
+        execute_mock.assert_has_calls(calls)
+
+    @mock.patch('ironic_python_agent.utils.execute', autospec=True)
+    def test_run_shutdown_command_valid_poweroff_sysrq(self, execute_mock):
+        execute_mock.side_effect = [('', ''), ('',
+                                    'Running in chroot, ignoring request.'),
+                                    ('', '')]
+
+        self.agent_extension._run_shutdown_command('poweroff')
+        calls = [mock.call('sync'),
+                 mock.call('poweroff', use_standard_locale=True,
+                           check_exit_code=[0]),
+                 mock.call("echo o > /proc/sysrq-trigger", shell=True)]
+        execute_mock.assert_has_calls(calls)
+
+    @mock.patch('ironic_python_agent.utils.execute', autospec=True)
+    def test_run_shutdown_command_valid_reboot_sysrq(self, execute_mock):
+        execute_mock.side_effect = [('', ''), ('',
+                                    'Running in chroot, ignoring request.'),
+                                    ('', '')]
+
+        self.agent_extension._run_shutdown_command('reboot')
+        calls = [mock.call('sync'),
+                 mock.call('reboot', use_standard_locale=True,
+                           check_exit_code=[0]),
+                 mock.call("echo b > /proc/sysrq-trigger", shell=True)]
         execute_mock.assert_has_calls(calls)
 
     @mock.patch('ironic_python_agent.utils.execute', autospec=True)
@@ -689,7 +716,8 @@ class TestStandbyExtension(test_base.BaseTestCase):
         success_result = self.agent_extension.run_image()
         success_result.join()
         calls = [mock.call('sync'),
-                 mock.call('reboot', check_exit_code=[0])]
+                 mock.call('reboot', use_standard_locale=True,
+                           check_exit_code=[0])]
         execute_mock.assert_has_calls(calls)
         self.assertEqual('SUCCEEDED', success_result.command_status)
 
@@ -711,7 +739,8 @@ class TestStandbyExtension(test_base.BaseTestCase):
         success_result.join()
 
         calls = [mock.call('sync'),
-                 mock.call('poweroff', check_exit_code=[0])]
+                 mock.call('poweroff', use_standard_locale=True,
+                           check_exit_code=[0])]
         execute_mock.assert_has_calls(calls)
         self.assertEqual('SUCCEEDED', success_result.command_status)
 
diff --git a/releasenotes/notes/coreos_ipa_image_poweroff_reboot_in_chroot_by_sysrq-42447fc4cdd7dafe.yaml b/releasenotes/notes/coreos_ipa_image_poweroff_reboot_in_chroot_by_sysrq-42447fc4cdd7dafe.yaml
new file mode 100644
index 00000000..0d416f5a
--- /dev/null
+++ b/releasenotes/notes/coreos_ipa_image_poweroff_reboot_in_chroot_by_sysrq-42447fc4cdd7dafe.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - Fixes a bug in the CoreOS IPA images (where IPA runs in a chroot), where
+    IPA could not power off or reboot properly. In this case, it will now use
+    SYSRQ commands to forcefully reboot or power off.