Created attachment 754282 [details]
attached Screenshot for Diagnostic page

Description of problem:
Clean install ovirt-node-iso-3.0.0-0.999.999.20130528151650git2f8c3a1.2330.fc18.iso,then enter into Diagnostics page.
Select the "parted -l" diagnostic tool,the Diagnostics page will hang, didn't show command Output Dialog.

Press "F2" to drop into shell and execute command "parted -l" by manually.
[root@dhcp-10-111 admin]# parted -l
Error: The backup GPT table is corrupt, but the primary appears OK, so that will
be used.
OK/Cancel?

Version-Release number of selected component (if applicable):
ovirt-node-iso-3.0.0-0.999.999.20130528151650git2f8c3a1.2330.fc18.iso

How reproducible:
100%

Steps to Reproduce:

Actual results:
After selected the "parted -l" diagnostic tool,the Diagnostics page will hang, didn't show command Output Dialog.

Expected results:
After selected the "parted -l" diagnostic tool,the Diagnostics page will show command Output Dialog.

Additional info:
workaround: chang the follow code in diagnostics_page.py

 80     def __diagnostics(self):
 81         return [("multipath", "multipath -ll"),
 82                 ("fdisk", "fdisk -l"),
-83                 ("parted", "parted -l")
+83                 ("parted", "echo ok |parted -l"),
 84                 ("lsblk", "lsblk")]