nobu	2017-07-09 13:20:48 +0900 (Sun, 09 Jul 2017)

  New Revision: 59291

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59291

  Log:
    make-snapshot: generate ChangeLog iff not exist
    
    * tool/make-snapshot (package): ChangeLog had existed in pre-2.4
      revisions, but not doc/ChangeLog-YYYY.  fix for 2..3.

  Modified files:
    trunk/tool/make-snapshot
Index: tool/make-snapshot
===================================================================
--- tool/make-snapshot	(revision 59290)
+++ tool/make-snapshot	(revision 59291)
@@ -229,14 +229,16 @@ def package(vcs, rev, destdir, tmp = nil https://github.com/ruby/ruby/blob/trunk/tool/make-snapshot#L229
     v = v[0]
   end
 
-  # get last revision from previous ChangeLog archive
-  last_ChangeLog = Dir["#{v}/doc/ChangeLog-*"].grep(/-(\d+)\z/) {|n| [$1.to_i, n]}.max[1]
-  open(last_ChangeLog) do |f|
-    f.readline
-    unless /\Ar(\d+) / =~ f.readline
-      abort "#{File.basename $0}: Cannot find revision from '#{last_ChangeLog}'"
+  unless File.exist?("#{v}/ChangeLog")
+    # get last revision from previous ChangeLog archive
+    last_ChangeLog = Dir["#{v}/doc/ChangeLog-*"].grep(/-(\d+)\z/) {|n| [$1.to_i, n]}.max[1]
+    open(last_ChangeLog) do |f|
+      f.readline
+      unless /\Ar(\d+) / =~ f.readline
+        abort "#{File.basename $0}: Cannot find revision from '#{last_ChangeLog}'"
+      end
+      vcs.export_changelog(url, $1.to_i, revision.to_i, "#{v}/ChangeLog")
     end
-    vcs.export_changelog(url, $1.to_i, revision.to_i, "#{v}/ChangeLog")
   end
 
   open("#{v}/revision.h", "wb") {|f| f.puts "#define RUBY_REVISION #{revision}"}

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