56 lines
2.1 KiB
Diff
56 lines
2.1 KiB
Diff
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From 23a6123348f0a387768ebdfdaaded900a083039e Mon Sep 17 00:00:00 2001
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From: Todd Lewis <todd_lewis@unc.edu>
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Date: Wed, 16 Nov 2022 10:45:39 -0500
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Subject: [PATCH] Fix boot time derivation for systems with no rtc
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That addresses https://bugzilla.redhat.com/show_bug.cgi?id=2137935
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---
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plugins/needs_restarting.py | 24 +++++++++++++++++++++++-
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1 file changed, 23 insertions(+), 1 deletion(-)
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diff --git a/plugins/needs_restarting.py b/plugins/needs_restarting.py
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index 91dbe66..03831fa 100644
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--- a/plugins/needs_restarting.py
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+++ b/plugins/needs_restarting.py
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@@ -34,6 +34,7 @@ import functools
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import os
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import re
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import stat
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+import time
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# For which package updates we should recommend a reboot
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@@ -199,7 +200,28 @@ class ProcessStart(object):
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@staticmethod
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def get_boot_time():
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- return int(os.stat('/proc/1').st_mtime)
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+ """
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+ We have two sources from which to derive the boot time. These values vary
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+ depending on containerization, existence of a Real Time Clock, etc.
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+ For our purposes we want the latest derived value.
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+ - st_mtime of /proc/1
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+ Reflects the time the first process was run after booting
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+ This works for all known cases except machines without
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+ a RTC - they awake at the start of the epoch.
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+ - /proc/uptime
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+ Seconds field of /proc/uptime subtracted from the current time
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+ Works for machines without RTC iff the current time is reasonably correct.
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+ Does not work on containers which share their kernel with the
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+ host - there the host kernel uptime is returned
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+ """
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+
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+ proc_1_boot_time = int(os.stat('/proc/1').st_mtime)
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+ if os.path.isfile('/proc/uptime'):
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+ with open('/proc/uptime', 'rb') as f:
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+ uptime = f.readline().strip().split()[0].strip()
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+ proc_uptime_boot_time = int(time.time() - float(uptime))
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+ return max(proc_1_boot_time, proc_uptime_boot_time)
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+ return proc_1_boot_time
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@staticmethod
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def get_sc_clk_tck():
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--
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libgit2 1.3.2
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