[Bug 2047975] Re: package systemd-resolved 253.5-1ubuntu7 failed to install/upgrade: installed systemd-resolved package post-installation script subprocess returned error exit status 1 [cp: '/etc/resolv.conf' and '/run/systemd/resolve/stub-resolv.conf' are the same file]

[Nick Rosbrook]

I got some information from a user on a more recent duplicate (bug
2063533). The problem seems to be that some users, when disabling the
stub-resolver, also create a symlink /etc/resolv.conf ->
/run/systemd/resolve/resolv.conf. This is not actually necessary because
systemd-resolved will make stub-resolv.conf a symlink to resolv.conf
when DNSStubListener=no.

Hence, the command

cp "${DPKG_ROOT}/etc/resolv.conf"
"${DPKG_ROOT}/run/systemd/resolve/stub-resolv.conf"

in systemd-resolved.postinst fails because the source and destination
are *both* symlinks to /run/systemd/resolve/resolv.conf.

** Also affects: systemd (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu Noble)
       Status: New => Triaged

** Changed in: systemd (Ubuntu Noble)
   Importance: Undecided => High

** Changed in: systemd (Ubuntu Noble)
     Assignee: (unassigned) => Nick Rosbrook (enr0n)

** Tags added: foundations-todo systemd-sru-next

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Title:
  package systemd-resolved 253.5-1ubuntu7 failed to install/upgrade:
  installed systemd-resolved package post-installation script subprocess
  returned error exit status 1 [cp: '/etc/resolv.conf' and
  '/run/systemd/resolve/stub-resolv.conf' are the same file]

Status in systemd package in Ubuntu:
  Confirmed
Status in systemd source package in Noble:
  Triaged

Bug description:
  upgraded from 22.04 -> 24.04

  ProblemType: Package
  DistroRelease: Ubuntu 24.04
  Package: systemd-resolved 253.5-1ubuntu7
  ProcVersionSignature: Ubuntu 6.2.0-39.40~22.04.1-generic 6.2.16
  Uname: Linux 6.2.0-39-generic x86_64
  ApportVersion: 2.27.0-0ubuntu6
  Architecture: amd64
  CasperMD5CheckResult: pass
  CloudArchitecture: x86_64
  CloudID: none
  CloudName: none
  CloudPlatform: none
  CloudSubPlatform: config
  Date: Wed Jan  3 21:06:55 2024
  ErrorMessage: installed systemd-resolved package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2023-02-27 (311 days ago)
  InstallationMedia: Ubuntu-Server 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809)
  Python3Details: /usr/bin/python3.11, Python 3.11.7, python3-minimal, 3.11.4-5
  PythonDetails: N/A
  RebootRequiredPkgs: Error: path contained symlinks.
  RelatedPackageVersions:
   dpkg 1.22.1ubuntu5
   apt  2.7.6
  SourcePackage: systemd
  Title: package systemd-resolved 253.5-1ubuntu7 failed to install/upgrade: installed systemd-resolved package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to noble on 2024-01-03 (0 days ago)
  mtime.conffile..etc.systemd.resolved.conf: 2023-02-27T21:16:55.869158

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