Re: [Libguestfs] [PATCH 1/2] inspection: Set package manager to "unknown" if parsing major version failed (RHBZ#1332025).

In cases where parsing the release file failed and so we have an obviously incorrect major version number, don't try to infer the package manager from the major version number. In the bug report, parsing the /etc/redhat-release file of a CentOS 7.1 guest failed, so major version was set to 0, and the package manager was inferred as "up2date". virt-customize then failed with a peculiar error: virt-customize: sorry, don't know how to use --install with the 'up2date' package manager Instead this sets it to "unknown" which will cause virt-customize to fail with: virt-customize: --install is not supported for this guest operating system which is (only very slightly) better. Problem reported by novegin on IRC. ---