Description of problem:

executing "yum clean all" as a user can lead to crashes caused by permission denials.

Version-Release number of selected component (if applicable):


How reproducible:

execute "yum clean all" with fastestmirror-plugin, which has stuff to clean up (for example /var/cache/yum/timedhosts.txt)
  
Actual results:

crash with python backtrace

Expected results:

yum handling the denial in a less dramatic way

Additional info:

traceback (language set to German):

$ yum clean all
Geladene Plugins: fastestmirror, keys, list-data, presto, refresh-packagekit, remove-with-leaves
Räume alles auf
Cleaning up list of fastest mirrors
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 254, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 109, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 356, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 538, in doCommand
    return base.cleanCli(extcmds)
  File "/usr/share/yum-cli/cli.py", line 902, in cleanCli
    self.plugins.run('clean')
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 177, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/fastestmirror.py", line 119, in clean_hook
    os.unlink(hostfilepath)
OSError: [Errno 13] Keine Berechtigung: '/var/cache/yum/timedhosts.txt'