extract ova files from an archive
$ tar -xvf vmName.ova
modify ovf for some invalid tag
$ vi vmName.ovf
re-calculate sha1 from vmName.ovf, then modify the hash value of vmName.mf
$ sha1sum vmName.ovf
$ vi vmName.mf
package to ova which source files from [vmName.ovf, vmName-disk1.vmdk, vmName.mf]
$ tar -cvf vmName-NEW.ova vmName.ovf vmName-disk1.vmdk vmName.mf
tar -cvf vmName-NEW.ova vmName.ovf vmName-disk1.vmdk vmName.mf
- no comma needed