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

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You have been subscribed to a public bug by Sebastien Bacher (seb128):

Hello,
Add-apt-repository command allows one 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 run twice, adds duplicate entries.
$ sudo add-apt-repository "deb http://archive.canonical.com/ubuntu oneiric partner

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

ProblemType: BugDistroRelease: 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/bashSourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: software-properties (Ubuntu)
     Importance: Low
     Assignee: Michael Vogt (mvo)
         Status: Triaged


** Tags: amd64 apport-bug oneiric patch running-unity testcase
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add-apt-repository will write duplicate entries to /etc/apt/sources.list
https://bugs.launchpad.net/bugs/854841
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