[Bug 849736] Re: apt-cache policy silently shows inaccurate information when any file in /etc/apt/sources.list.d is unreadable

[Torsten Spindler]

A modified version of the patch, adding "ignore the apt-get update warning below" to the output. Background is, that if any error is detected during cachefile.cc pkgCacheFile::BuildCaches, apt will print the warning:
W: You may want to run apt-get update to correct these problems
In the case of an unreadable source list this is misleading.

The code printing the apt-get update warning:
   /* This sux, remove it someday */
   if (ErrorWasEmpty == true && _error->empty() == false)
      _error->Warning(_("You may want to run apt-get update to correct these problems"));


** Patch added: "apt-unreadable_sources.patch"
   https://bugs.launchpad.net/ubuntu/+source/apt/+bug/849736/+attachment/2796483/+files/apt-unreadable_sources.patch

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https://bugs.launchpad.net/bugs/849736

Title:
  apt-cache policy silently shows inaccurate information when any file
  in /etc/apt/sources.list.d is unreadable

Status in “apt” package in Ubuntu:
  Triaged

Bug description:
  Version: 0.8.16~exp5ubuntu8
  Release:	11.10

  I've noticed some odd behaviour from apt-cache policy where it
  pretends, without protest, that package versions in PPAs don't exist.

  The trigger seems to be a newly-added source whose .list file I set up
  to be only readable by root (it contains authentication information).

  When any file in /etc/apt/sources.list.d is unreadable, apt-cache
  won't try to read further files, and it also apparently discards
  information from any of the files it did manage to read.  (Assuming it
  reads them as it goes — I was only tracing calls to open(2).)

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