[Bug 1736965] Re: "netplan apply" does not set file mode, umask 077 causes systemd-networkd to be unable to start

[Steve Langasek]

** Changed in: netplan.io (Ubuntu Bionic)
       Status: Fix Released => Fix Committed

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https://bugs.launchpad.net/bugs/1736965

Title:
  "netplan apply" does not set file mode, umask 077 causes systemd-
  networkd to be unable to start

Status in netplan.io package in Ubuntu:
  Fix Released
Status in nplan package in Ubuntu:
  Confirmed
Status in netplan.io source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  Ubuntu users configuring a custom umask on their system

  [Test case]
  1) set UMASK in /etc/login.defs to 077
  2) Configure netplan to use the networkd renderer, run 'sudo netplan apply'.
  3) Verify that systemd-network applies the correct network configuration.

  [Regression potential]
  This enforces setting the umask for the netplan-gnerated configurations to a value that allows networkd to read the files for the configuration. If people rely on the umask, and have otherwise configured systemd-networkd to be able to get the configuration, this would defeat their umask change. The failure more for this is something that isn't supported.

  ---

  If you set your UMASK in /etc/login.defs to 077 then after running "netplan apply" systemd-networkd won't be able to read its configuration files and start:
  systemd-networkd[2826]: Could not load configuration files: Permission denied

  Annoyingly to report such a thing as bug you need a proper network
  connection with working DNS before you submit in ubuntu-bug or it will
  just quit and lose the report. A workaround seems to be to run
  "ubuntu-bug nplan" then in another terminal run "umask 022" then
  "netplan apply" before submitting.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: nplan 0.30
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  Uname: Linux 4.13.0-17-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.5
  Architecture: amd64
  Date: Thu Dec  7 10:20:37 2017
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=screen
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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