[Bug 1289597] [NEW] bash: words: bad array subscript

[Barry Warsaw]

Public bug reported:

cd to your $HOME and without entering anything at the prompt, hit TAB.
I get the error in the Subject.

The bug seems obvious: in /usr/share/bash-completion/bash_completion,
line 710 you have:

    [[ $cword -eq 0 ]] && return 1

but `set -x` in a bash and doing the above shows $cword to be -1, thus
the following line (711):

    prev=${words[cword-1]}

fails with the error.

The fix is easy.  s/-eq/-le/ on 710.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: bash-completion 1:2.1-2ubuntu2 [modified: usr/share/bash-completion/bash_completion]
ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
Uname: Linux 3.13.0-16-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Mar  7 16:37:37 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-12-06 (91 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: bash-completion
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: bash-completion (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1289597

Title:
  bash: words: bad array subscript

Status in “bash-completion” package in Ubuntu:
  New

Bug description:
  cd to your $HOME and without entering anything at the prompt, hit TAB.
  I get the error in the Subject.

  The bug seems obvious: in /usr/share/bash-completion/bash_completion,
  line 710 you have:

      [[ $cword -eq 0 ]] && return 1

  but `set -x` in a bash and doing the above shows $cword to be -1, thus
  the following line (711):

      prev=${words[cword-1]}

  fails with the error.

  The fix is easy.  s/-eq/-le/ on 710.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: bash-completion 1:2.1-2ubuntu2 [modified: usr/share/bash-completion/bash_completion]
  ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
  Uname: Linux 3.13.0-16-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Mar  7 16:37:37 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-12-06 (91 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  PackageArchitecture: all
  SourcePackage: bash-completion
  UpgradeStatus: No upgrade log present (probably fresh install)

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