Issue #17280 has been updated by Eregon (Benoit Daloze).


Currently, even `Dir[".*"]` and `Dir["{*,.*}"]` match `..`, which seems surprising.
The PR fixes those, and I think the resulting behavior is much more useful.

----------------------------------------
Bug #17280: Dir.glob with FNM_DOTMATCH matches ".." and "." and results in duplicated entries
https://bugs.ruby-lang.org/issues/17280#change-88698

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
```
% ruby -e 'p Dir.glob("**/*", File::FNM_DOTMATCH)'
[".", "bar", "bar/.", "bar/.baz", "bar/.baz/.", "bar/.baz/qux"]
% ruby -e 'p Dir.glob("**", File::FNM_DOTMATCH)' 
[".", "..", "bar"]
% ruby -e 'p Dir.glob("*", File::FNM_DOTMATCH)' 
[".", "..", "bar"]
```

I think `".."` was never intended by the user here, is it a bug?

Not sure about `"."`.

Note it also causes duplicated entries: `bar and bar/.baz` are twice in the Array!

I think `..` should always be ignored for glob purposes, it escapes the current directory.
And `.` seems useless and causing duplicates.

I think the intention of users of `File::FNM_DOTMATCH` is to match file/directories starting with a `.` like `.baz`.
Probably `Dir.glob("**/{*,.*}")` is a safer way to achieve that,
but still I think `FNM_DOTMATCH` should not produce such weird results.

From https://github.com/oracle/truffleruby/issues/2116
I could not figure out what was the intended semantics for FNM_DOTMATCH with regards to `.` and `..`.



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