[Bug 1827753] Re: udev package doesn't mark as a configuration file fbdev-blacklist.conf

[Balint Reczey]

@chaitrex, IMO the workaround proposed by @ddstreet in #2 is the simplest solution, overriding default configuration by placing a configuration in /etc and this also follows the general concept of how systems should be configured.
The big miss here is not having the behavior documented in modprobe.d(5).

Since the file in /lib/modprobe.d can be overridden by placing an identically named file in /etc i don't think that making the file shipped in /lib/modprobe.d is necessary or desired.
Also we would like to go in the direction of not shipping files in /etc by default, so moving the file to /etc would be a step back.

As a side note in similar situation the system administrator can use
dpkg-divert to keep a file from being overwritten by a package upgrade.


** Also affects: kmod (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: kmod (Ubuntu)
   Importance: Undecided => Wishlist

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

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

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

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https://bugs.launchpad.net/bugs/1827753

Title:
  udev package doesn't mark as a configuration file fbdev-blacklist.conf

Status in kmod package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  Opinion

Bug description:
  System information
  ====================

      $ lsb_release -rd
      Description:	Ubuntu 18.04.2 LTS
      Release:	18.04

      $ apt-cache policy udev
      udev:
        Installed: 237-3ubuntu10.21
        Candidate: 237-3ubuntu10.21
        Version table:
       *** 237-3ubuntu10.21 500
              500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
              100 /var/lib/dpkg/status
           237-3ubuntu10.19 500
              500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
           237-3ubuntu10 500
              500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

   Problem
  =========

  The `udev` package includes `/lib/modprobe.d/fbdev-blacklist.conf`, a
  configuration file blacklisting several kernel modules. It's not
  listed as a configuration file in the package, though:

      $ cat /var/lib/dpkg/info/udev.conffiles
      /etc/init.d/udev
      /etc/udev/udev.conf

  This means that, if I want to go ahead and use the `sisfb` kernel
  module, for example, I unblacklist it in the two files it's
  blacklisted in. However, any updated version of `udev` that's
  installed will throw away my changes to `/lib/modprobe.d/fbdev-
  blacklist.conf` by simply overwriting the file and again blacklist the
  kernel module, which doesn't work well when the system is being used
  by someone very new to computers.

  I can't avoid that by simply telling APT to leave configuration files
  alone because the `.conf` file here technically isn't a configuration
  file. Also, `chattr +i /lib/modprobe.d/fbdev-blacklist.conf` causes
  APT to require someone with technical knowledge to take extra effort
  to repair things when the end user agrees to an install in the weekly
  GUI reminder of new software.

   Request
  =========

  Please mark `/lib/modprobe.d/fbdev-blacklist.conf` as a configuration
  file in `udev`.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: udev 237-3ubuntu10.21
  ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
  Uname: Linux 4.15.0-47-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: XFCE
  CustomUdevRuleFiles: 70-snap.core.rules 70-snap.cnctsun.rules 70-snap.cncra2yr.rules 70-snap.cncra.rules 60-vboxdrv.rules
  Date: Sat May  4 21:51:42 2019
  InstallationDate: Installed on 2018-12-27 (128 days ago)
  InstallationMedia: Xubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 020: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9360
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-47-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=1
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/27/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.10.0
  dmi.board.name: 0839Y6
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr2.10.0:bd09/27/2018:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0839Y6:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9360
  dmi.sys.vendor: Dell Inc.

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