Allow setting permission on CopyFile helper

[xiaokangwang]

This is a security enhancement that avoid unsafe by default permission that allow read from other users.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.61%. Comparing base (cc79bbe) to head (0c2d590).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2921      +/-   ##
==========================================
- Coverage   35.61%   35.61%   -0.01%     
==========================================
  Files         729      729              
  Lines       41550    41550              
==========================================
- Hits        14799    14798       -1     
- Misses      25115    25116       +1     
  Partials     1636     1636              

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