python3 - TypeError: 'str' does not support the buffer interface

[glennmatthews]

$ /ws/glmatthe-rtp/cot/bin/cot -f edit-hardware /nobackup/iosxrv-rp.ova -s 3
Traceback (most recent call last):
  File "/ws/glmatthe-rtp/cot/bin/cot", line 64, in <module>
    COT.cli.main()
  File "/ws/glmatthe-rtp/cot/COT/cli.py", line 228, in main
    args.func(args)
  File "/ws/glmatthe-rtp/cot/COT/edit_hardware.py", line 191, in edit_hardware
    vm.set_ide_subtype(args.ide_subtype, args.profiles)
  File "/ws/glmatthe-rtp/cot/COT/vm_context_manager.py", line 83, in __exit__
    self.obj.write()
  File "/ws/glmatthe-rtp/cot/COT/ovf.py", line 294, in write
    self.generate_manifest(ovf_file)
  File "/ws/glmatthe-rtp/cot/COT/ovf.py", line 1533, in generate_manifest
    .format(file=os.path.basename(ovf_file), sum=sha1sum))
TypeError: 'str' does not support the buffer interface

[glennmatthews]

Introduced by b52d7b0