potiuk commented on pull request #21145:
URL: https://github.com/apache/airflow/pull/21145#issuecomment-1039144587


   > @potiuk I am not very clear about this part of the code too. How does this 
command helps to find the deleted files.
   
   You can do it in python by simply trying if a file exist before attempting 
to run chmod. 
   
   This one is "bash-y" way of handling the case that you had a file in git, 
but you just deleted it in your commit. In this case it will be present in the 
`git ls-files` output, but it will not be physically there so running "chmod" 
will fail :). 
   


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