[GR-18163] Fix locale docs for Oracle Linux and fix test when run in Docker

ci.jsonnet

@@ -10,7 +10,7 @@
 # https://github.com/google/jsonnet/releases and compiled.
 
 # CONFIGURATION
-local overlay = "86462312c58551adf8993c7fbced4963751230d3";
+local overlay = "6f30aacf41a0c15262f890770972e3f74af187e7";
 
 # For debugging: generated builds will be restricted to those listed in
 # the array. No restriction is applied when it is empty.

doc/user/utf8-locale.md

@@ -21,6 +21,7 @@ Instead, all values should be `"en_US.UTF-8"` or other regions but still `.UTF-8
 ### Fedora-based: RHEL, Oracle Linux, etc
 
 ```bash
+sudo dnf install glibc-langpack-en
 export LANG=en_US.UTF-8
 ```
 

spec/truffle/include_all_c_header_spec.rb

@@ -10,8 +10,9 @@
 
 describe 'lib/cext/include/internal_all.h' do
   it 'includes each *.h file from lib/cext/include/internal/' do
-    filenames = Dir.glob('internal/**/*.h', base: 'lib/cext/include', sort: true)
-    content = File.read('lib/cext/include/internal_all.h')
+    ruby_home = RbConfig::CONFIG['prefix']
+    filenames = Dir.glob('internal/**/*.h', base: "#{ruby_home}/lib/cext/include", sort: true)
+    content = File.read("#{ruby_home}/lib/cext/include/internal_all.h")
 
     filenames.should_not be_empty
 
@@ -20,8 +21,9 @@
   end
 
   it 'includes each *.h file from lib/cext/include/stubs/internal/' do
-    filenames = Dir.glob('internal/**/*.h', base: 'lib/cext/include/stubs', sort: true)
-    content = File.read('lib/cext/include/internal_all.h')
+    ruby_home = RbConfig::CONFIG['prefix']
+    filenames = Dir.glob('internal/**/*.h', base: "#{ruby_home}/lib/cext/include/stubs", sort: true)
+    content = File.read("#{ruby_home}/lib/cext/include/internal_all.h")
 
     filenames.should_not be_empty
 

src/main/ruby/truffleruby/core/dir.rb

@@ -303,7 +303,7 @@ def glob(pattern, flags = 0, base: nil, sort: true, &block)
 
         total = matches.size
         while index < total
-          matches[index] = matches[index].encode(enc) unless matches[index].encoding == enc
+          matches[index] = matches[index].force_encoding(enc) unless matches[index].encoding == enc
           index += 1
         end
       end

src/main/ruby/truffleruby/core/env.rb

@@ -366,7 +366,11 @@ def set_encoding(value)
     if Encoding.default_internal && value.ascii_only?
       value = value.encode Encoding.default_internal, Encoding::LOCALE
     elsif value.encoding != Encoding::LOCALE
-      value = value.dup.force_encoding(Encoding::LOCALE)
+      if Encoding::LOCALE == Encoding::US_ASCII && !value.ascii_only?
+        value = value.b
+      else
+        value = value.dup.force_encoding(Encoding::LOCALE)
+      end
     end
     value.freeze
   end