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[Launchpad Bug Tracker <1405950@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/wily-proposed/software-properties

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https://bugs.launchpad.net/bugs/1405950

Title:
  sudo apt-add-repository ppa: results in IndexError: string index out
  of range

Status in One Hundred Papercuts:
  Confirmed
Status in software-properties package in Ubuntu:
  Confirmed

Bug description:
  $ sudo apt-add-repository ppa
  Error: 'ppa' invalid

  Just saying ppa without a user- or ppa name fails gracefully and
  informs the user it doesn't work. However, if we add the ':'
  separator, it attempts and fails to parse the string:

  $ sudo apt-add-repository ppa:
  Traceback (most recent call last):
    File "/usr/bin/apt-add-repository", line 119, in <module>
      shortcut = shortcut_handler(line)
    File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 837, in shortcut_handler
      ret = factory(shortcut)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 382, in shortcut_handler
      return PPAShortcutHandler(shortcut)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 345, in __init__
      self.shortcut = mangle_ppa_shortcut(shortcut)
    File "/usr/lib/python3/dist-packages/softwareproperties/ppa.py", line 133, in mangle_ppa_shortcut
      if (user[0] == "~"):
  IndexError: string index out of range

  This should handle the error more gracefully and display a similar
  error message to the user as above.

  (See also bug 1405951 which is unrelated but similar)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: software-properties-common 0.96.1
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.15.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Dec 27 15:06:46 2014
  InstallationDate: Installed on 2014-12-19 (7 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141211)
  PackageArchitecture: all
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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