Bug #16391: Dir.pwd, Dir[] pathname case inconsistency

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.6.5p114 (2019-10-01 revision 67812) [x64-mingw32]
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN

[dbuck (Dave Buck)]

Directory globbing case sensitivity is os-dependent
(https://ruby-doc.org/core-2.6.5/Dir.html, glob,
"Case sensitivity depends on your system");
On Windows 10, directory globbing is case insensitive,
and may return glob matches that do
not match the case of the query.
Unfortunately, File.fnmatch seems to be case sensitive,
so this is not a workaround.

Expected:
If Dir.pwd => 'C:/users/dave/Documents' (lower case for users)
then Dir[Dir.pwd+'/*'] => ['C:/users/dave/Documents/...',...]
(lower case for users), not [C:/Users/dave/Documents/...',...] (upper case Users)

Impact:
Rails 6.0 Activeview implementation has an assumption that
case in pwd will match that in glob

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)

Dir.pwd returns 'C:/Users/...', not 'C:/users/...' for me.

Unfortunately, File.fnmatch seems to be case sensitive,
so this is not a workaround.

File::Constants has two constants for File.fnmatch

• FNM_CASEFOLD:
  Makes File.fnmatch patterns case insensitive (but not Dir.glob patterns).

• FNM_SYSCASE:
  System default case insensitiveness, equals to FNM_CASEFOLD or 0.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|fb11e6089dbe9d995510977def038a21882bcffe.

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[DOC] Added File::FNM_SYSCASE example [Bug #16391] [ci skip]