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Always use /proc/sys/kernel/random/boot_id to confirm reboot on Linux (#47017)

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* Always use /proc/sys/kernel/random/boot_id to confirm reboot on Linux

/proc/sys/kernel/random/boot_id is available since kernel 2.3.16 and
should be safe to rely on.

The previously used method by checking the system boot time using who -b
turned out to be unreliable: Some systems lacking an RTC report the Unix
epoch as boot time, but the code trying to detect that did't always
work.

Closes #46562

* Change DEFAULT_BOOT_TIME_COMMAND

- change to usinsg /proc by default
- add BOOT_TIME_COMMANDS for BSD, Solaris, and macOS
This commit is contained in:
Stefan Siegel 2018-11-08 15:54:58 +01:00 committed by Sam Doran
parent e2bba149d6
commit ae7b9ea8cd
2 changed files with 8 additions and 19 deletions
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2
changelogs/fragments/reboot-change-default-boot-command.yaml Normal file
View file

@ -0,0 +1,2 @@
bugfixes:
- reboot - change default reboot time command to prevent hanging on certain systems (https://github.com/ansible/ansible/issues/46562)

25
lib/ansible/plugins/action/reboot.py
View file

@ -35,7 +35,7 @@ class ActionModule(ActionBase):
DEFAULT_PRE_REBOOT_DELAY = 0
DEFAULT_POST_REBOOT_DELAY = 0
DEFAULT_TEST_COMMAND = 'whoami'
DEFAULT_BOOT_TIME_COMMAND = 'who -b'
DEFAULT_BOOT_TIME_COMMAND = 'cat /proc/sys/kernel/random/boot_id'
DEFAULT_REBOOT_MESSAGE = 'Reboot initiated by Ansible'
DEFAULT_SHUTDOWN_COMMAND = 'shutdown'
DEFAULT_SUDOABLE = True
@ -43,15 +43,18 @@ class ActionModule(ActionBase):
DEPRECATED_ARGS = {}
BOOT_TIME_COMMANDS = {
'openbsd': "/sbin/sysctl kern.boottime",
'openbsd': '/sbin/sysctl kern.boottime',
'freebsd': '/sbin/sysctl kern.boottime',
'sunos': 'who -b',
'darwin': 'who -b',
}
SHUTDOWN_COMMANDS = {
'linux': DEFAULT_SHUTDOWN_COMMAND,
'freebsd': DEFAULT_SHUTDOWN_COMMAND,
'openbsd': DEFAULT_SHUTDOWN_COMMAND,
'sunos': '/usr/sbin/shutdown',
'darwin': '/sbin/shutdown',
'openbsd': DEFAULT_SHUTDOWN_COMMAND,
}
SHUTDOWN_COMMAND_ARGS = {
@ -110,22 +113,6 @@ class ActionModule(ActionBase):
boot_time_command = self.BOOT_TIME_COMMANDS.get(distribution, self.DEFAULT_BOOT_TIME_COMMAND)
command_result = self._low_level_execute_command(boot_time_command, sudoable=self.DEFAULT_SUDOABLE)
# For single board computers, e.g., Raspberry Pi, that lack a real time clock and are using fake-hwclock
# launched by systemd, the update of utmp/wtmp is not done correctly.
# Fall back to using uptime -s for those systems.
# https://github.com/systemd/systemd/issues/6057
if '1970-01-01 00:00' in command_result['stdout']:
stdout += command_result['stdout']
stderr += command_result['stderr']
command_result = self._low_level_execute_command('uptime -s', sudoable=self.DEFAULT_SUDOABLE)
# This is a last resort for bare Linux systems (e.g. OpenELEC) where 'who -b' or 'uptime -s' are not supported.
# Other options like parsing /proc/uptime or default uptime output are less reliable than this
if command_result['rc'] != 0:
stdout += command_result['stdout']
stderr += command_result['stderr']
command_result = self._low_level_execute_command('cat /proc/sys/kernel/random/boot_id', sudoable=self.DEFAULT_SUDOABLE)
if command_result['rc'] != 0:
stdout += command_result['stdout']
stderr += command_result['stderr']