Revert "Merge fileutils-1.1.0."

This reverts commit 99da3d2570e110d3024039102205f6d64174bf5e.
The change caused the following build failure:

```
.../ruby/lib/fileutils.rb:88:in `require': cannot load such file -- rbconfig (LoadError)
uncommon.mk:987: recipe for target 'encdb.h' failed
make: *** [encdb.h] Error 1
```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63428 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/fileutils.gemspec

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
-
 Gem::Specification.new do |s|
   s.name = "fileutils"
-  s.version = '1.1.0'
+  s.version = '1.0.2'
+  s.date = '2017-12-22'
   s.summary = "Several file utility methods for copying, moving, removing, etc."
   s.description = "Several file utility methods for copying, moving, removing, etc."
 
   s.require_path = %w{lib}
   s.files = [".gitignore", ".travis.yml", "Gemfile", "LICENSE.txt", "README.md", "Rakefile", "bin/console", "bin/setup", "fileutils.gemspec", "lib/fileutils.rb"]
-  s.required_ruby_version = ">= 2.3.0"
+  s.required_ruby_version = ">= 2.4.0"
 
   s.authors = ["Minero Aoki"]
   s.email = [nil]

lib/fileutils.rb

@@ -85,11 +85,9 @@
 # <tt>:verbose</tt> flags to methods in FileUtils.
 #
 
-require 'rbconfig'
-
 module FileUtils
 
-  VERSION = "1.1.0"
+  VERSION = "1.0.2"
 
   def self.private_module_function(name)   #:nodoc:
     module_function name
@@ -121,9 +119,8 @@ module FileUtils
   #
   def cd(dir, verbose: nil, &block) # :yield: dir
     fu_output_message "cd #{dir}" if verbose
-    result = Dir.chdir(dir, &block)
+    Dir.chdir(dir, &block)
     fu_output_message 'cd -' if verbose and block
-    result
   end
   module_function :cd
 
@@ -544,7 +541,7 @@ module FileUtils
   module_function :move
 
   def rename_cannot_overwrite_file?   #:nodoc:
-    /emx/ =~ RbConfig::CONFIG['host_os']
+    /emx/ =~ RUBY_PLATFORM
   end
   private_module_function :rename_cannot_overwrite_file?
 
@@ -684,38 +681,22 @@ module FileUtils
     unless parent_st.sticky?
       raise ArgumentError, "parent directory is world writable, FileUtils#remove_entry_secure does not work; abort: #{path.inspect} (parent directory mode #{'%o' % parent_st.mode})"
     end
-
     # freeze tree root
     euid = Process.euid
-    dot_file = fullpath + "/."
-    begin
-      File.open(dot_file) {|f|
-        unless fu_stat_identical_entry?(st, f.stat)
-          # symlink (TOC-to-TOU attack?)
-          File.unlink fullpath
-          return
-        end
-        f.chown euid, -1
-        f.chmod 0700
-      }
-    rescue EISDIR # JRuby in non-native mode can't open files as dirs
-      File.lstat(dot_file).tap {|fstat|
-        unless fu_stat_identical_entry?(st, fstat)
-          # symlink (TOC-to-TOU attack?)
-          File.unlink fullpath
-          return
-        end
-        File.chown euid, -1, dot_file
-        File.chmod 0700, dot_file
-      }
-    end
-
-    unless fu_stat_identical_entry?(st, File.lstat(fullpath))
-      # TOC-to-TOU attack?
-      File.unlink fullpath
-      return
-    end
-
+    File.open(fullpath + '/.') {|f|
+      unless fu_stat_identical_entry?(st, f.stat)
+        # symlink (TOC-to-TOU attack?)
+        File.unlink fullpath
+        return
+      end
+      f.chown euid, -1
+      f.chmod 0700
+      unless fu_stat_identical_entry?(st, File.lstat(fullpath))
+        # TOC-to-TOU attack?
+        File.unlink fullpath
+        return
+      end
+    }
     # ---- tree root is frozen ----
     root = Entry_.new(path)
     root.preorder_traverse do |ent|
@@ -816,15 +797,8 @@ module FileUtils
   #
   def compare_stream(a, b)
     bsize = fu_stream_blksize(a, b)
-
-    if RUBY_VERSION > "2.4"
-      sa = String.new(capacity: bsize)
-      sb = String.new(capacity: bsize)
-    else
-      sa = String.new
-      sb = String.new
-    end
-
+    sa = String.new(capacity: bsize)
+    sb = String.new(capacity: bsize)
     begin
       a.read(bsize, sa)
       b.read(bsize, sb)
@@ -1149,7 +1123,7 @@ module FileUtils
     private
 
     def fu_windows?
-      /mswin|mingw|bccwin|emx/ =~ RbConfig::CONFIG['host_os']
+      /mswin|mingw|bccwin|emx/ =~ RUBY_PLATFORM
     end
 
     def fu_copy_stream0(src, dest, blksize = nil)   #:nodoc:

test/fileutils/test_fileutils.rb

@@ -233,7 +233,7 @@ class TestFileUtils < Test::Unit::TestCase
 
   def test_assert_output_lines
     assert_raise(MiniTest::Assertion) {
-      Timeout.timeout(0.5) {
+      Timeout.timeout(0.1) {
         assert_output_lines([]) {
           Thread.current.report_on_exception = false
           raise "ok"
@@ -834,15 +834,13 @@ class TestFileUtils < Test::Unit::TestCase
     check_singleton :ln_s
 
     TARGETS.each do |fname|
-      begin
-        fname = "../#{fname}"
-        lnfname = 'tmp/lnsdest'
-        ln_s fname, lnfname
-        assert FileTest.symlink?(lnfname), 'not symlink'
-        assert_equal fname, File.readlink(lnfname)
-      ensure
-        rm_f lnfname
-      end
+      fname = "../#{fname}"
+      lnfname = 'tmp/lnsdest'
+      ln_s fname, lnfname
+      assert FileTest.symlink?(lnfname), 'not symlink'
+      assert_equal fname, File.readlink(lnfname)
+    ensure
+      rm_f lnfname
     end
   end if have_symlink? and !no_broken_symlink?
 
@@ -1615,10 +1613,6 @@ class TestFileUtils < Test::Unit::TestCase
     check_singleton :cd
   end
 
-  def test_cd_result
-    assert_equal 42, cd('.') { 42 }
-  end
-
   def test_chdir
     check_singleton :chdir
   end