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

1 files changed, 20 insertions, 46 deletions

diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 7cbc6f46fa..88e28f29d5 100644
--- a/lib/fileutils.rb
+++ b/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: