Minor improvement for SCP preserve flag: #680
Merged
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Problem:
When trying to SCP a file to a remote machine, where the file exists (overwrite) and the user you're using for SCP is not the owner of the file, you get error "set mode: Operation not permitted", whenever -p switch is specified.
Solution:
Added a boolean variable to toggle usage of -p switch when using SCPUploadClient.copy()
Since it's an extend, the default behavior is unchanged, omitting -p is optional and needs to be explicitly specified.