Bug #15649

Dir.glob regression with braces and Windows drive letters

Added by daniel-rikowski (Daniel Rikowski) over 1 year ago. Updated over 1 year ago.

Target version:
ruby -v:
ruby 2.6.1p33 (2019-01-30 revision 66950) [x64-mingw32]


I noticed that certain glob patterns involving braces and drive letters, which did work in Ruby 2.5.3, no longer work in Ruby 2.6.1.

Assume I have a directory C:\Projects and my current directory is C:\Windows. Using IRB I can observe the following results of Dir.glob:

Patterns working in 2.6.1 and 2.5.3:

Dir['c:'] => ['c:']
Dir['c:/'] => ['c:/']
Dir['c:/projects'] => ['c:/Projects']

Patterns broken in 2.6.1 (but working in 2.5.3)

Dir['{c:}'] => ['Windows']
Dir['{c:/}'] => ['Windows/']
Dir['{c:/projects}'] => []

Some background:
I noticed this problem first in Rails, where the file modification watcher tries to glob a pattern like {c:/dir1/**/*.{rb},c:/dir2/**/*.{rb},c:/dir3/**/*.{rb}}
Due to the bug above, the code reloading feature of Rails is broken using Ruby 2.6.1 on Windows. (Because the pattern is always resolved to an empty array)

Rubies tested:

  • ruby 2.5.3p105 (2018-10-18 revision 65156) [x64-mingw32]
  • ruby 2.6.1p33 (2019-01-30 revision 66950) [x64-mingw32]


0001-dir.c-fix-Dir.glob-starts-with-brace.patch (2.46 KB) 0001-dir.c-fix-Dir.glob-starts-with-brace.patch h.shirosaki (Hiroshi Shirosaki), 03/20/2019 01:32 AM

Updated by cfis (Charlie Savage) over 1 year ago

Seeing the same here. Seems like its the braces that are broken on Windows in Ruby 2.6. Rails autoloading feature combines a number of glob patterns into a string for reason, instead of passing in an array.

Note I also submitted to Rails -

Updated by h.shirosaki (Hiroshi Shirosaki) over 1 year ago

I created a patch for the bug.


Updated by Anonymous over 1 year ago

  • Status changed from Open to Closed

Applied in changeset trunk|r67332.

dir.c: fix Dir.glob starts with brace

  • dir.c (ruby_glob0): expand braces if a glob pattern starts with brace. [ruby-core:91728] [Bug #15649]

Updated by naruse (Yui NARUSE) over 1 year ago

  • Backport changed from 2.4: DONTNEED, 2.5: DONTNEED, 2.6: REQUIRED to 2.4: DONTNEED, 2.5: DONTNEED, 2.6: DONE

ruby_2_6 r67353 merged revision(s) 67332.

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