[Bug 854841] [NEW] add-apt-repository writes duplicate entries to /etc/apt/sources.list

[moma]

Public bug reported:

Hello,
Add-apt-repository command seems to add duplicate entries to sources list. Would it be possible to improve this utility it so it adds only unique entries?

Eg. This command, when runned twice, adds duplicate entries. 
$ sudo add-apt-repository "deb http://archive.canonical.com/ubuntu oneiric partner

$ grep -Ri partner /etc/apt/sources.list

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: python-software-properties 0.81.9
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
Date: Tue Sep 20 18:38:17 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110919)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric running-unity

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https://bugs.launchpad.net/bugs/854841

Title:
  add-apt-repository writes duplicate entries to /etc/apt/sources.list

Status in “software-properties” package in Ubuntu:
  New

Bug description:
  Hello,
  Add-apt-repository command seems to add duplicate entries to sources list. Would it be possible to improve this utility it so it adds only unique entries?

  Eg. This command, when runned twice, adds duplicate entries. 
  $ sudo add-apt-repository "deb http://archive.canonical.com/ubuntu oneiric partner

  $ grep -Ri partner /etc/apt/sources.list

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: python-software-properties 0.81.9
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  Date: Tue Sep 20 18:38:17 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110919)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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