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.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59291 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 7 deletions

diff --git a/tool/make-snapshot b/tool/make-snapshot
index 96d8c1e950..3063f52deb 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -229,14 +229,16 @@ def package(vcs, rev, destdir, tmp = nil)
     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}"}