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98 lines
3.2 KiB
Markdown
98 lines
3.2 KiB
Markdown
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---
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title: Solutions
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author: Funzi
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---
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# Solutions and Troubleshooting
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## `dnf` always claims to require a restart
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### Symptom
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Even though the system has been restarted recently, e.g., after a Kernel update, `dnf needs-restarting -r` always
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returns with exit code `1`.
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```
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# dnf needs-restarting -r
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Core libraries or services have been updated since boot-up:
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* dbus
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* dbus-daemon
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* glibc
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* linux-firmware
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* systemd
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Reboot is required to fully utilize these updates.
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More information: https://access.redhat.com/solutions/27943
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```
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**This affects both Rocky Linux 8 and 9.** However,
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a [patch for 9.3 is to be released soon](https://github.com/rpm-software-management/dnf-plugins-core/pull/468).
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### Cause
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The `dnf` plugin uses the `mtime` of `/proc/1` which is set to start of epoch due to lack of RTC on Raspberry Pi. The
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correct system time is set later at boot once network connectivity is established and an NTP server is reachable.
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Compared to 1970, every package update is after the last reboot which causes the wrong result.
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### Solution
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Until 9.3 is released, or if the system is still on
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8.x, [the patch](https://github.com/rpm-software-management/dnf-plugins-core/pull/468/commits/b8132e1e04fb44c9ef8ab7dbcea2d2b3b920be2c)
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can be manually applied to all versions.
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```
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# patch /usr/lib/python3.6/site-packages/dnf-plugins/needs_restarting.py <<EOF
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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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2.41.0
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EOF
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```
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It is advisable to `version-lock` the plugin version until it's fixed upstream. On 8.x, that might be the only solutions
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if the patch is not backported to 8.x upstream.
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**Use at your own risk!**
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```
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# dnf versionlock add python3-dnf-plugins-core
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```
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