[Bug 1645815] Update Released

[Steve Langasek]

The verification of the Stable Release Update for apt has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1645815

Title:
  apt install of local debs does not tab-complete

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  Fix Committed
Status in apt source package in Yakkety:
  Fix Released

Bug description:
  [Impact]
  Previously apt's bash completion was such that, given

      $ mkdir xyzzz
      $ touch xyzzy.deb xyzzx.two.deb

  you'd get

      $ apt install xyzz<tab>
      xyzzx.two.deb  xyzzz/
      $ apt install /tmp/foo/xyzz<tab>
      xyzzx.two.deb  xyzzz/

  this is inconsistent (xyzzx.two.deb is listed but not xyzzy.deb), but
  worse than that it offered things that apt would not actually
  recognise as candidates for install:

      $ sudo apt install xyzzx.two.deb
      Reading package lists... Done
      Building dependency tree
      Reading state information... Done
      E: Unable to locate package xyzzx.two.deb
      E: Couldn't find any package by glob 'xyzzx.two.deb'
      E: Couldn't find any package by regex 'xyzzx.two.deb'

  [Test case]
  With this small (trival, really) change, apt's bash completion should
  only offer things apt understands, and won't recquire an aditional
  period in the filename to offer it:

      $ apt install xyzz<tab>^C
      $ # (no completions!)
      $ apt install ./xyzz<tab>
      xyzzx.two.deb  xyzzy.deb      xyzzz/
      $ apt install /tmp/foo/xyzz
      xyzzx.two.deb  xyzzy.deb      xyzzz/

  
  [Regression potential]
  Only the expansion of filenames in the completion is affected:
  -                _filedir "*.deb"
  +                if [[ "$cur" == ./* || "$cur" == /* ]]; then
  +                    _filedir "deb"
  +                fi
  so it's unlikely to introduce any regression.

  [Original bug report]

  this fails:

  $ touch xyzzy.deb
  $ apt install xyzzy<tab>

  because the completion support for install is using _filedir wrong.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: apt 1.2.15
  ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
  Uname: Linux 4.4.0-47-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Nov 29 17:51:57 2016
  InstallationDate: Installed on 2016-07-05 (147 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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