[Bug 1679789] Re: Trailing slash missing from Dir::Cache in apt configuration

[Julian Andres Klode]

You need to specify /d at the end of an option name to get a directory
name (or /f for a file). Just using the option name is not​ correct, it
might ignore path components.

** Changed in: apt (Ubuntu)
       Status: New => Invalid

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Title:
  Trailing slash missing from Dir::Cache in apt configuration

Status in apt package in Ubuntu:
  Invalid

Bug description:
  The apt configuration database has some incompatible changes which
  break existing scripts.  It is not obvious that this was deliberate (I
  hope not).

  Prior to 16.10, the configured cache directory path(s) included a
  trailing slash.  Now they do not include the trailing slash.  This
  breaks existing scripts which combine bits from the configuration
  database.

  In 16.04:
    $ apt-config shell D Dir C Dir::Cache F Dir::Cache::pkgcache
    D='/'
    C='var/cache/apt/'
    F='pkgcache.bin'

    So if this output is eval'd in the shell, then
       path=${D}${C}${F}  produces "/var/cache/apt/pkgcache.bin"

  However in 16.10:
    $ apt-config shell D Dir C Dir::Cache F Dir::Cache::pkgcache
    D='/'
    C='var/cache/apt'
    F='pkgcache.bin'

    So existing shell code now breaks
      path=${D}${C}${F}  produces "/var/cache/aptpkgcache.bin"

  If this was a mistake, please fix ASAP.  
  If it was on purpose, please post (a link to) an explanation.

  Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: apt 1.3.4
  ProcVersionSignature: Ubuntu 4.8.0-46.49-generic 4.8.17
  Uname: Linux 4.8.0-46-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Apr  4 10:33:13 2017
  InstallationDate: Installed on 2016-05-06 (332 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160506)
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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