[Bug 1845529] Re: bash completion shows `awk: line 18: function gensub never defined` on `umount /dev/<Tab>`

[Mauricio Faria de Oliveira]

Looked at the remaining autopkgtest failures for util-linux/eoan [1]:

util-linux
Regression in autopkgtest for sbd (i386): test log
Regression in autopkgtest for gfs2-utils (i386): test log
Regression in autopkgtest for network-manager (ppc64el): test log

- sbd/i386:
  passed with retries [2]

- network-manager/ppc64el:
  passed with retries [3]

- gfs2-utils/i386:
  failure is unrelated to this change.

  there's an ioctl() failing w/ ENOTTY from the kernel (see strace below)
  so it's unrelated to this change to bash autocompletion.

  it's reproducible w/ util-linux from eoan-updates,
  thus not a regression from eoan-proposed.

  i'll try to look at this, 
  but this should not block this SRU any longer.

root at autopkgtest:~# strace -e ioctl gfs2_jadd -j 1 /mnt2
ioctl(5, FS_IOC32_GETFLAGS or FS_IOC_GETFLAGS, 0xffb9d568) = -1 ENOTTY (Inappropriate ioctl for device)
ioctl(6, TCGETS, {B9600 opost isig icanon echo ...}) = 0
GETFLAGS: Inappropriate ioctl for device
+++ exited with 1 +++

root at autopkgtest:~# dpkg -s util-linux | grep -i version:
Version: 2.34-0.1ubuntu2

cheers,
Mauricio


[1] https://people.canonical.com/~ubuntu-archive/pending-sru.html

[2] https://autopkgtest.ubuntu.com/packages/sbd/eoan/i386
sbd [eoan/i386]
1.4.0-18-g5e3283c-1ubuntu1 	util-linux/2.34-0.1ubuntu2.1 	2020-01-14 13:02:27 UTC 	0h 16m 07s 	mfo 	pass

[3] https://autopkgtest.ubuntu.com/packages/network-manager/eoan/ppc64el
network-manager [eoan/ppc64el]
1.20.4-2ubuntu2 	util-linux/2.34-0.1ubuntu2.1 	2020-01-14 13:06:12 UTC 	0h 20m 00s 	mfo 	pass

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https://bugs.launchpad.net/bugs/1845529

Title:
  bash completion shows `awk: line 18: function gensub never defined` on
  `umount /dev/<Tab>`

Status in bash-completion package in Ubuntu:
  Invalid
Status in ubuntu-meta package in Ubuntu:
  Invalid
Status in util-linux package in Ubuntu:
  Fix Released
Status in bash-completion source package in Eoan:
  Invalid
Status in gawk source package in Eoan:
  Invalid
Status in mawk source package in Eoan:
  Invalid
Status in ubuntu-meta source package in Eoan:
  Invalid
Status in util-linux source package in Eoan:
  Fix Committed
Status in bash-completion source package in Focal:
  Invalid
Status in gawk source package in Focal:
  Invalid
Status in mawk source package in Focal:
  Invalid
Status in ubuntu-meta source package in Focal:
  Invalid
Status in util-linux source package in Focal:
  Fix Released
Status in Debian:
  Confirmed

Bug description:
  [Impact]
  Any user attempting to tab-complete from "umount /dev/" when running the bash shell.

  [Test cases]
  Steps to reproduce:
  1. Install Ubuntu MATE 19.10 using minimal desktop option
  2. Open terminal and enter `umount /dev/s` and then hit <Tab>

  Expected result:
  * bash completion works as expected

  Actual results:
  * bash completion does not work :

  $ umount /dev/awk: line 18: function gensub never defined
  awk: line 18: function gensub never defined
  awk: line 18: function gensub never defined
  awk: line 18: function gensub never defined

  $ umount /meawk: line 18: function gensub never defined
  awk: line 18: function gensub never defined
  awk: line 18: function gensub never defined
  awk: line 18: function gensub never defined

  
  [Regression potential]
  Since it is limited to a single file (/usr/share/bash-completion/completions/umount) and affects only it, as well as given that it currently does not work, I estimate this as a low risk change. Things to look out for as a regression would be if another previously-working completion would fail to work (ie. what if mount stops completing correctly, and works again if the fix is backed out?).

  ---

  
  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: bash-completion 1:2.9-1ubuntu1
  ProcVersionSignature: Ubuntu 5.3.0-10.11-generic 5.3.0-rc8
  Uname: Linux 5.3.0-10-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Thu Sep 26 18:46:59 2019
  Dependencies:

  InstallationDate: Installed on 2019-09-26 (0 days ago)
  InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Beta amd64 (20190926.1)
  PackageArchitecture: all
  SourcePackage: bash-completion
  UpgradeStatus: No upgrade log present (probably fresh install)

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