vcs.rb: dcommit for each commit

svn to git bridge on ci.ruby-lang.org sometimes stalls when
dcommitting some commits at once.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62059 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/vcs.rb

@@ -479,16 +479,18 @@ class VCS
       rev = cmd_read(%W"#{COMMAND} svn info"+[STDERR=>[:child, :out]])[/^Last Changed Rev: (\d+)/, 1]
       com = cmd_read(%W"#{COMMAND} svn find-rev r#{rev}").chomp
 
-      # TODO: dcommit necessary commits only with --add-author-from
-      same = true
-      cmd_pipe([COMMAND, "log", "--format=%ae %ce", "#{com}..@"], "rb") do |r|
-        r.each do |l|
-          same &&= /^(\S+) +\1$/ =~ l
-        end
+      commits = cmd_read([COMMAND, "log", "--reverse", "--format=%H %ae %ce", "#{com}..@"], "rb").split("\n")
+      commits.each_with_index do |l, i|
+        r, a, c = l.split
+        dcommit = [COMMAND, "svn", "dcommit"]
+        dcommit.insert(-2, "-n") if $DEBUG
+        dcommit << "--add-author-from" unless a == c
+        dcommit << r
+        system(*dcommit) or return false
+        system(COMMAND, "rebase") or return false
       end
-      ret = system(COMMAND, "svn", "dcommit", *(["--add-author-from"] unless same))
 
-      if ret and rev
+      if rev
         old = [cmd_read(%W"#{COMMAND} log -1 --format=%H").chomp]
         old << cmd_read(%W"#{COMMAND} svn reset -r#{rev}")[/^r#{rev} = (\h+)/, 1]
         3.times do
@@ -497,7 +499,7 @@ class VCS
           break unless old.include?(cmd_read(%W"#{COMMAND} log -1 --format=%H").chomp)
         end
       end
-      ret
+      true
     end
   end
 end