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

[Daniel Hartwig]

On 11 July 2012 02:48, David Ayers <ayers at fsfe.org> wrote:
>    ifstream F(File.c_str(),ios::in /*| ios::nocreate*/);
>    if (!F != 0)
>       return _error->Errno("ifstream::ifstream",_("Opening %s"),File.c_str());
>
> but the C++ documentation I found says:
> If the constructor is not successful in opening the file, the
> object is still created although no file is associated to the
> stream buffer and the stream's failbit is set (which can be
> checked with inherited member fail).
> http://www.cplusplus.com/reference/iostream/ifstream/ifstream/

The test is ok.  !F is equivalent to F.fail() [1], which effectively
makes the test:

 if (F.fail() != false)

[1] http://www.cplusplus.com/reference/iostream/ios/operatornot/

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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 “apt” package in Ubuntu:
  Confirmed
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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