[Bug 968756] Re: apt-add-repository fails while adding ppa

[prani_bobby]

This is a valid bug and needs to be fixed. A nice error message should
be sufficient rather than printing a stack trace.

My error log:

pranith at labdesk:~/virtualbox/tmp/virtualbox-4.1.12-dfsg$ sudo add-apt-repository ppa:bobby-prani/virtualbox-precise
You are about to add the following PPA to your system:
 
 More info: https://launchpad.net/~bobby-prani/+archive/virtualbox-precise
Press [ENTER] to continue or ctrl-c to cancel adding it

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 99, in run
    self.add_ppa_signing_key(self.ppa_path)
  File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 127, in add_ppa_signing_key
    if len(signing_key_fingerprint) < 160/8:
TypeError: object of type 'NoneType' has no len()


** Changed in: software-properties (Ubuntu)
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/968756

Title:
  apt-add-repository fails while adding ppa

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

Bug description:
  sudo apt-add-repository ppa:floaty-devs/ppa
  You are about to add the following PPA to your system:
   
   More info: https://launchpad.net/~floaty-devs/+archive/ppa
  Press [ENTER] to continue or ctrl-c to cancel adding it

  Exception in thread Thread-1:
  Traceback (most recent call last):
    File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
      self.run()
    File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 95, in run
      self.add_ppa_signing_key(self.ppa_path)
    File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 117, in add_ppa_signing_key
      "--recv", signing_key_fingerprint])
    File "/usr/lib/python2.7/subprocess.py", line 493, in call
      return Popen(*popenargs, **kwargs).wait()
    File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
      errread, errwrite)
    File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
      raise child_exception
  TypeError: execv() arg 2 must contain only strings

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: apt 0.8.16~exp12ubuntu6
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  Date: Fri Mar 30 01:38:13 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  ProcEnviron:
   TERM=xterm
   LANG=sk_SK.UTF-8
   SHELL=/bin/bash
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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