common.mk: ims=nil option

* common.mk (update-gems): use ims=nil option.

* tool/downloader.rb (Downloader.download): show the message if no
  need to download in verbose mode.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48497 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -893,7 +893,7 @@ update-gems: PHONY
 	    -I../tool -rdownloader -answ \
 	    -e 'gem, ver = *$$F' \
 	    -e 'gem = "#{gem}-#{ver}.gem"' \
-	    -e 'Downloader::RubyGems.download(gem)' \
+	    -e 'Downloader::RubyGems.download(gem, nil, nil)' \
 	    bundled_gems
 
 UPDATE_LIBRARIES = no

tool/downloader.rb

@@ -9,10 +9,6 @@ class Downloader
 
   class RubyGems < self
     def self.download(name, *rest)
-      if File.exist?(name)
-        $stdout.puts "#{name} already exists"
-        return
-      end
       super("https://rubygems.org/downloads/#{name}", name, *rest)
     end
   end
@@ -58,7 +54,13 @@ class Downloader
   #            'UnicodeData.txt', 'enc/unicode/data'
   def self.download(url, name, dir = nil, ims = true)
     file = dir ? File.join(dir, File.basename(name)) : name
-    return true if ims.nil? and File.exist?(file)
+    if ims.nil? and File.exist?(file)
+      if $VERBOSE
+        $stdout.puts "#{name} already exists"
+        $stdout.flush
+      end
+      return true
+    end
     url = URI(url)
     if $VERBOSE
       $stdout.print "downloading #{name} ... "