Created attachment 327908 [details]
screnshot of yucky dialog

Description of problem:
Ugly message in tiny error box, if PackageKit fills the disk while trying to check for updates.

Version-Release number of selected component (if applicable):
gnome-packagekit-0.3.12-3.fc9.i386

How reproducible:
Yes.

Steps to Reproduce:
1. Almost completely fill your disk where yum cache hides.
2. Let PK do it's background checking for updates.
  
Actual results:
Tiny non-expandable dialog: containing when details clicked:
Error Type: <type 'exceptions.IOError'>
Error Value: [Errno 28] No space left on device
  File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2280, in <module>
    main()
  File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 2277, in main
    backend.dispatcher(sys.argv[1:])

Expected results:
1. Perhaps there is already out of disk space style error dialogs available elsewhere in gnome/freedesktop/fedora, that could be triggered. If not maybe such a general thing would be a general enhancement in the future.

2. Specifically trap the exception, and provide a dialog with a nice message like "
Package detected an error:
While attempting to retrieve the list of available updates, the device containing the update cache [/var/cache/x] reported no disk space left.
PackageKit can resume normal operation once some action is taken to reduce the disk usage on that device."