AlexanderKaraberov opened a new pull request #1164: Fix: Proper error handling 
for file:open() call in couch_file.erl
   ## Overview
   According to Erlang's 
[file:open]( docs this function 
returns `{error, Reason}` in case of failure but inside `couch_file:sync` and 
`init` functions there are no checks for this in two places. Consequently when 
I received `{error, emfile}` kind of error, process crashed with `badmatch` 
instead of a proper error.
   ## Testing recommendations
   Simulate `{error, emfile}` conditions (e.g. decrease `ulimit` on your OS) 
and observe an error.
   ## Checklist
   - [ ] Code is written and works correctly;
   - [ ] Changes are covered by tests;
   - [ ] Documentation reflects the changes;

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