Comment 9 for bug 1806701

>Note that commit 530850f971e improves the situation on vmware to
>*not* do the grep if the filesystem has a label 'OVF ENV'. In some recent
>experience I've seen this label provided by vmware.

As Scott mentioned, got the label 'OVF ENV' when attached OVF cdrom which need enable vApp options on a VM.
While the vApp options are not enabled by default on a VMware VM, so can NOT reply on it to check if current is a VMware installation.
To solve this issue, checking size might be the best option, that grep entire cdrom size only if it's size is small (ex: <=10MB).
And to speed up VMware guest customization, could move if ovf_vmware_guest_customization check to be in front of "is_cdrom_ovf" in dsCheckOVF()? , see https://bugs.launchpad.net/cloud-init/+bug/1806701/comments/6

Copy Ryan and Dan on this.

*** An article on how to enable vApp options on a VM: https://www.virtuallyghetto.com/2012/06/ovf-runtime-environment.html