[Bug 852003] Re: USC fails to launch in non-admin user account if there's a private PPA

[Łukasz Czyżykowski]

<mvo> lukasz: right, well, libapt supports building its cache entirely in memory and that should work. I agree its not ideal that it would be inconsistent - a alternative is to use the /etc/apt/auth file to store the credentials but that would require some additional work and testing but its defeinitely a good idea
<lukasz> mvo, so what would be a proposed solution? update libapt so for in-memory cache it ignored unreadable files?
<mvo> lukasz: that will help, but it seems like the cleaner solution is to teach aptsources in python-apt to write passwords in a debline to /etc/apt/auth.conf - that file is in netrc style and can be mode 0600. it should be honored by all http/https/ftp methods of apt. but that needs testing and I'm not sure if the libapt support for this file is bugfree as this is not featured used much yet

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https://bugs.launchpad.net/bugs/852003

Title:
  USC fails to launch in non-admin user account if there's a private PPA

Status in “python-apt” package in Ubuntu:
  Confirmed
Status in “software-center” package in Ubuntu:
  Triaged

Bug description:
  Ubuntu Software Center 4.1.23.2, Ubuntu 11.10 beta 1
  Ubuntu Software Center 5.0.1.4, Ubuntu 11.10

  1. Subscribe to a private PPA. (For example, purchase some software.)
  2. Close USC and relaunch it.
  3. Switch to a guest account (or any non-admin account), and launch USC.

  What happens:
  2. USC opens.
  3. USC fails to open, with this traceback:
  ------------
  Traceback (most recent call last):
    File "/usr/bin/software-center", line 151, in <module>
      app = SoftwareCenterAppGtk3(datadir, xapian_base_path, options, args)
    File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 206, in __init__
      self.cache.open()
    File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 209, in open
      self._cache = apt.Cache(GtkMainIterationProgress())
    File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 93, in __init__
      self.open(progress)
    File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 140, in open
      self._list.read_main_list()
  SystemError: E:Opening /etc/apt/sources.list.d/private-ppa.launchpad.net_whatever_ubuntu.list - ifstream::ifstream (13: Permission denied)
  ------------

  What should happen:
  3. USC should launch.

  Bug 746625 (currently marked Invalid) is the equivalent bug in apt.

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