[Bug 2055239] Re: Warning: The unit file, source configuration file or drop-ins of {apt-news, esm-cache}.service changed on disk. Run 'systemctl daemon-reload' to reload units.

Wed Jul 31 19:59:18 UTC 2024

This issue can be seen with any actual unit after e.g. enabling or
disabling a non-existent unit. For example,

root at n:~# systemctl status ssh.socket
● ssh.socket - OpenBSD Secure Shell server socket
     Loaded: loaded (/usr/lib/systemd/system/ssh.socket; enabled; preset: enabled)
     Active: active (listening) since Wed 2024-07-31 19:51:18 UTC; 5min ago
   Triggers: ● ssh.service
     Listen: [::]:22 (Stream)
     CGroup: /system.slice/ssh.socket

Jul 31 19:55:15 n systemd[1]: ssh.socket: Trying to enqueue job ssh.socket/start/replace
Jul 31 19:55:15 n systemd[1]: ssh.socket: Installed new job ssh.socket/start as 734
Jul 31 19:55:15 n systemd[1]: ssh.socket: Enqueued job ssh.socket/start as 734
Jul 31 19:55:15 n systemd[1]: ssh.socket: Job 734 ssh.socket/start finished, result=done
Jul 31 19:55:53 n systemd[1]: ssh.socket: Changed dead -> listening
Jul 31 19:56:05 n systemd[1]: ssh.socket: Trying to enqueue job ssh.socket/start/replace
Jul 31 19:56:05 n systemd[1]: ssh.socket: Installed new job ssh.socket/start as 825
Jul 31 19:56:05 n systemd[1]: ssh.socket: Enqueued job ssh.socket/start as 825
Jul 31 19:56:05 n systemd[1]: ssh.socket: Job 825 ssh.socket/start finished, result=done
Jul 31 19:56:20 n systemd[1]: ssh.socket: Changed dead -> listening

root at n:~# systemctl enable fdfldakfjdklfjdaljfa.service
Failed to enable unit: Unit file fdfldakfjdklfjdaljfa.service does not exist.

root at n:~# systemctl status ssh.socket
Warning: The unit file, source configuration file or drop-ins of ssh.socket changed on disk. Run 'systemctl daemon-reload' to reload units.
● ssh.socket - OpenBSD Secure Shell server socket
     Loaded: loaded (/usr/lib/systemd/system/ssh.socket; enabled; preset: enabled)
     Active: active (listening) since Wed 2024-07-31 19:51:18 UTC; 5min ago
   Triggers: ● ssh.service
     Listen: [::]:22 (Stream)
     CGroup: /system.slice/ssh.socket

Jul 31 19:55:15 n systemd[1]: ssh.socket: Trying to enqueue job ssh.socket/start/replace
Jul 31 19:55:15 n systemd[1]: ssh.socket: Installed new job ssh.socket/start as 734
Jul 31 19:55:15 n systemd[1]: ssh.socket: Enqueued job ssh.socket/start as 734
Jul 31 19:55:15 n systemd[1]: ssh.socket: Job 734 ssh.socket/start finished, result=done
Jul 31 19:55:53 n systemd[1]: ssh.socket: Changed dead -> listening
Jul 31 19:56:05 n systemd[1]: ssh.socket: Trying to enqueue job ssh.socket/start/replace
Jul 31 19:56:05 n systemd[1]: ssh.socket: Installed new job ssh.socket/start as 825
Jul 31 19:56:05 n systemd[1]: ssh.socket: Enqueued job ssh.socket/start as 825
Jul 31 19:56:05 n systemd[1]: ssh.socket: Job 825 ssh.socket/start finished, result=done
Jul 31 19:56:20 n systemd[1]: ssh.socket: Changed dead -> listening

I have tested [1] in a PPA build, and the issue goes away.

It may have already been pointed out, but the reason this is seen with
apt-news.service and esm-cache.service specifically is because of the
hook defined in /etc/apt/apt.conf.d/20apt-esm-hook.conf which starts
these services. Besides that, there is nothing special about them which
makes this bug appear.

[1]
https://github.com/systemd/systemd/pull/32610/commits/d69cba3bfffc7b1e3197e2a34b459db13b1e1cb7

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https://bugs.launchpad.net/bugs/2055239

Title:
  Warning: The unit file, source configuration file or drop-ins of {apt-
  news,esm-cache}.service changed on disk. Run 'systemctl daemon-reload'
  to reload units.

Status in snapd:
  New
Status in systemd package in Ubuntu:
  Fix Released
Status in ubuntu-advantage-tools package in Ubuntu:
  Invalid
Status in systemd source package in Noble:
  Triaged
Status in ubuntu-advantage-tools source package in Noble:
  Invalid

Bug description:
  I recently started seeing the following warning messages when I run
  `apt update`.

  $ sudo apt update
  Warning: The unit file, source configuration file or drop-ins of apt-news.service changed on disk. Run 'systemctl daemon-reload' to reload units.
  Warning: The unit file, source configuration file or drop-ins of esm-cache.service changed on disk. Run 'systemctl daemon-reload' to reload units.
  ...

  apt-news.service for example is in /lib/systemd/system/apt-
  news.service and it's a static file managed by the package. Does the
  package maintenance script call systemd related hooks to reload the
  config whenever the package gets updated?

  $ systemctl cat apt-news.service
  # /usr/lib/systemd/system/apt-news.service
  # APT News is hosted at https://motd.ubuntu.com/aptnews.json and can include
  # timely information related to apt updates available to your system.
  ...

  $ dpkg -S /lib/systemd/system/apt-news.service
  ubuntu-pro-client: /lib/systemd/system/apt-news.service

  ProblemType: BugDistroRelease: Ubuntu 24.04
  Package: ubuntu-pro-client 31.1
  ProcVersionSignature: Ubuntu 6.6.0-14.14-generic 6.6.3
  Uname: Linux 6.6.0-14-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.28.0-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 28 13:06:35 2024
  InstallationDate: Installed on 2024-01-08 (51 days ago)
  InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Daily amd64 (20240104)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>SourcePackage: ubuntu-advantage-tools
  UpgradeStatus: No upgrade log present (probably fresh install)
  apparmor_logs.txt:

  cloud-id.txt-error:
   Failed running command 'cloud-id' [exit(2)]. Message: REDACTED config part /etc/cloud/cloud.cfg.d/99-installer.cfg, insufficient permissions
   REDACTED config part /etc/cloud/cloud.cfg.d/90-installer-network.cfg, insufficient permissions
   REDACTED config part /etc/cloud/cloud.cfg.d/99-installer.cfg, insufficient permissions
   REDACTED config part /etc/cloud/cloud.cfg.d/90-installer-network.cfg, insufficient permissions
  livepatch-status.txt-error: Invalid command specified '/snap/bin/canonical-livepatch status'.
  uaclient.conf:
   contract_url: https://contracts.canonical.com
   log_level: debug

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