add_group
add_group(snapshot_code, file_path, file_type, file_range, use_handoff_dir=False, mode=None)
Add a file range to an already existing snapshot
param:
snapshot_code - the unique code identifier of a snapshot
file_path - path of the file to add to the snapshot
file_type - type of the file to be added.
file_range - range with format s-e/b
keyparam:
use_handoff_dir - use handoff dir to checkin file
mode - one of 'copy','move','preallocate'
return:
dictionary - the resulting snapshot