diff --git a/common/bin/hgforest.sh b/common/bin/hgforest.sh
index 2282c3239ca0426728628179d50c2e7f5051afaf..13e9142ada4e0243b432554113b3df8a5fe84faa 100644
--- a/common/bin/hgforest.sh
+++ b/common/bin/hgforest.sh
@@ -1,7 +1,6 @@
 #!/bin/sh
-
 #
-# Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -23,165 +22,375 @@
 # questions.
 #
 
-# Shell script for a fast parallel forest command
-command="$1"
-pull_extra_base="$2"
+# Shell script for a fast parallel forest/trees command
+
+usage() {
+      echo "usage: $0 [-h|--help] [-q|--quiet] [-v|--verbose] [-s|--sequential] [--] <command> [commands...]" > ${status_output}
+      echo "Environment variables which modify behaviour:"
+      echo "   HGFOREST_QUIET      : (boolean) If 'true' then standard output is redirected to /dev/null"
+      echo "   HGFOREST_VERBOSE    : (boolean) If 'true' then Mercurial asked to produce verbose output"
+      echo "   HGFOREST_SEQUENTIAL : (boolean) If 'true' then repos are processed sequentially. Disables concurrency"
+      echo "   HGFOREST_GLOBALOPTS : (string, must begin with space) Additional Mercurial global options"
+      echo "   HGFOREST_REDIRECT   : (file path) Redirect standard output to specified file"
+      echo "   HGFOREST_FIFOS      : (boolean) Default behaviour for FIFO detection. Does not override FIFOs disabled"
+      echo "   HGFOREST_CONCURRENCY: (positive integer) Number of repos to process concurrently"
+      echo "   HGFOREST_DEBUG      : (boolean) If 'true' then temp files are retained"
+      exit 1
+}
+
+global_opts="${HGFOREST_GLOBALOPTS:-}"
+status_output="${HGFOREST_REDIRECT:-/dev/stdout}"
+qflag="${HGFOREST_QUIET:-false}"
+vflag="${HGFOREST_VERBOSE:-false}"
+sflag="${HGFOREST_SEQUENTIAL:-false}"
+while [ $# -gt 0 ]
+do
+  case $1 in
+    -h | --help )
+      usage
+      ;;
+
+    -q | --quiet )
+      qflag="true"
+      ;;
 
-if [ "" = "$command" ] ; then
-  echo No command to hg supplied!
-  exit 1
+    -v | --verbose )
+      vflag="true"
+      ;;
+
+    -s | --sequential )
+      sflag="true"
+      ;;
+
+    '--' ) # no more options
+      shift; break
+      ;;
+
+    -*)  # bad option
+      usage
+      ;;
+
+     * )  # non option
+      break
+      ;;
+  esac
+  shift
+done
+
+# silence standard output?
+if [ ${qflag} = "true" ] ; then
+  global_opts="${global_opts} -q"
+  status_output="/dev/null"
+fi
+
+# verbose output?
+if [ ${vflag} = "true" ] ; then
+  global_opts="${global_opts} -v"
+fi
+
+# Make sure we have a command.
+if [ $# -lt 1 -o -z "${1:-}" ] ; then
+  echo "ERROR: No command to hg supplied!"
+  usage
 fi
 
+command="$1"; shift
+command_args="${@:-}"
+
 # Clean out the temporary directory that stores the pid files.
 tmp=/tmp/forest.$$
 rm -f -r ${tmp}
 mkdir -p ${tmp}
 
+
+if [ "${HGFOREST_DEBUG:-false}" = "true" ] ; then
+  echo "DEBUG: temp files are in: ${tmp}"
+fi
+
+# Check if we can use fifos for monitoring sub-process completion.
+echo "1" > ${tmp}/read
+while_subshell=1
+while read line; do
+  while_subshell=0
+  break;
+done < ${tmp}/read
+rm ${tmp}/read
+
+on_windows=`uname -s | egrep -ic -e 'cygwin|msys'`
+
+if [ ${while_subshell} = "1" -o ${on_windows} = "1" ]; then
+  # cygwin has (2014-04-18) broken (single writer only) FIFOs
+  # msys has (2014-04-18) no FIFOs.
+  # older shells create a sub-shell for redirect to while
+  have_fifos="false"
+else
+  have_fifos="${HGFOREST_FIFOS:-true}"
+fi
+
 safe_interrupt () {
   if [ -d ${tmp} ]; then
     if [ "`ls ${tmp}/*.pid`" != "" ]; then
-      echo "Waiting for processes ( `cat ${tmp}/*.pid | tr '\n' ' '`) to terminate nicely!"
+      echo "Waiting for processes ( `cat ${tmp}/.*.pid ${tmp}/*.pid 2> /dev/null | tr '\n' ' '`) to terminate nicely!" > ${status_output}
       sleep 1
       # Pipe stderr to dev/null to silence kill, that complains when trying to kill
       # a subprocess that has already exited.
       kill -TERM `cat ${tmp}/*.pid | tr '\n' ' '` 2> /dev/null
       wait
-      echo Interrupt complete!
+      echo "Interrupt complete!" > ${status_output}
     fi
+    rm -f -r ${tmp}
   fi
-  rm -f -r ${tmp}
-  exit 1
+  exit 130
 }
 
 nice_exit () {
   if [ -d ${tmp} ]; then
-    if [ "`ls ${tmp}`" != "" ]; then
+    if [ "`ls -A ${tmp} 2> /dev/null`" != "" ]; then
       wait
     fi
+    if [ "${HGFOREST_DEBUG:-false}" != "true" ] ; then
+      rm -f -r ${tmp}
+    fi
   fi
-  rm -f -r ${tmp}
 }
 
 trap 'safe_interrupt' INT QUIT
 trap 'nice_exit' EXIT
 
+subrepos="corba jaxp jaxws langtools jdk hotspot nashorn"
+subrepos_extra="jdk/src/closed jdk/make/closed jdk/test/closed hotspot/make/closed hotspot/src/closed hotspot/test/closed deploy install sponsors pubs"
+
 # Only look in specific locations for possible forests (avoids long searches)
 pull_default=""
 repos=""
 repos_extra=""
-if [ "${command}" = "clone" -o "${command}" = "fclone" ] ; then
-  subrepos="corba jaxp jaxws langtools jdk hotspot nashorn"
-  if [ -f .hg/hgrc ] ; then
-    pull_default=`hg paths default`
-    if [ "${pull_default}" = "" ] ; then
-      echo "ERROR: Need initial clone with 'hg paths default' defined"
-      exit 1
-    fi
+if [ "${command}" = "clone" -o "${command}" = "fclone" -o "${command}" = "tclone" ] ; then
+  # we must be a clone
+  if [ ! -f .hg/hgrc ] ; then
+    echo "ERROR: Need initial repository to use this script" > ${status_output}
+    exit 1
   fi
+
+  # the clone must know where it came from (have a default pull path).
+  pull_default=`hg paths default`
   if [ "${pull_default}" = "" ] ; then
-    echo "ERROR: Need initial repository to use this script"
+    echo "ERROR: Need initial clone with 'hg paths default' defined" > ${status_output}
     exit 1
   fi
+
+  # determine which sub repos need to be cloned.
   for i in ${subrepos} ; do
     if [ ! -f ${i}/.hg/hgrc ] ; then
       repos="${repos} ${i}"
     fi
   done
-  if [ "${pull_extra_base}" != "" ] ; then
-    subrepos_extra="jdk/src/closed jdk/make/closed jdk/test/closed hotspot/make/closed hotspot/src/closed hotspot/test/closed deploy install sponsors pubs"
-    pull_default_tail=`echo ${pull_default} | sed -e 's@^.*://[^/]*/\(.*\)@\1@'`
-    pull_extra="${pull_extra_base}/${pull_default_tail}"
+
+  pull_default_tail=`echo ${pull_default} | sed -e 's@^.*://[^/]*/\(.*\)@\1@'`
+
+  if [ -n "${command_args}" ] ; then
+    # if there is an "extra sources" path then reparent "extra" repos to that path
+    if [ "x${pull_default}" = "x${pull_default_tail}" ] ; then
+      echo "ERROR: Need initial clone from non-local source" > ${status_output}
+      exit 1
+    fi
+    pull_extra="${command_args}/${pull_default_tail}"
+
+    # determine which extra subrepos need to be cloned.
     for i in ${subrepos_extra} ; do
       if [ ! -f ${i}/.hg/hgrc ] ; then
         repos_extra="${repos_extra} ${i}"
       fi
     done
+  else
+    if [ "x${pull_default}" = "x${pull_default_tail}" ] ; then
+      # local source repo. Clone the "extra" subrepos that exist there.
+      for i in ${subrepos_extra} ; do
+        if [ -f ${pull_default}/${i}/.hg/hgrc -a ! -f ${i}/.hg/hgrc ] ; then
+          # sub-repo there in source but not here
+          repos_extra="${repos_extra} ${i}"
+        fi
+      done
+    fi
   fi
-  at_a_time=2
+
   # Any repos to deal with?
   if [ "${repos}" = "" -a "${repos_extra}" = "" ] ; then
+    echo "No repositories to process." > ${status_output}
     exit
   fi
+
+  # Repos to process concurrently. Clone does better with low concurrency.
+  at_a_time="${HGFOREST_CONCURRENCY:-2}"
 else
-  hgdirs=`ls -d ./.hg ./*/.hg ./*/*/.hg ./*/*/*/.hg ./*/*/*/*/.hg 2>/dev/null`
-  # Derive repository names from the .hg directory locations
-  for i in ${hgdirs} ; do
-    repos="${repos} `echo ${i} | sed -e 's@/.hg$@@'`"
-  done
-  for i in ${repos} ; do
-    if [ -h ${i}/.hg/store/lock -o -f ${i}/.hg/store/lock ] ; then
-      locked="${i} ${locked}"
+  # Process command for all of the present repos
+  for i in . ${subrepos} ${subrepos_extra} ; do
+    if [ -d ${i}/.hg ] ; then
+      repos="${repos} ${i}"
     fi
   done
-  at_a_time=8
+
   # Any repos to deal with?
   if [ "${repos}" = "" ] ; then
-    echo "No repositories to process."
+    echo "No repositories to process." > ${status_output}
     exit
   fi
+
+  # any of the repos locked?
+  locked=""
+  for i in ${repos} ; do
+    if [ -h ${i}/.hg/store/lock -o -f ${i}/.hg/store/lock ] ; then
+      locked="${i} ${locked}"
+    fi
+  done
   if [ "${locked}" != "" ] ; then
-    echo "These repositories are locked: ${locked}"
-    exit
+    echo "ERROR: These repositories are locked: ${locked}" > ${status_output}
+    exit 1
   fi
+
+  # Repos to process concurrently.
+  at_a_time="${HGFOREST_CONCURRENCY:-8}"
 fi
 
 # Echo out what repositories we do a command on.
-echo "# Repositories: ${repos} ${repos_extra}"
-echo
-
-# Run the supplied command on all repos in parallel.
-n=0
-for i in ${repos} ${repos_extra} ; do
-  n=`expr ${n} '+' 1`
-  repopidfile=`echo ${i} | sed -e 's@./@@' -e 's@/@_@g'`
-  reponame=`echo ${i} | sed -e :a -e 's/^.\{1,20\}$/ &/;ta'`
-  pull_base="${pull_default}"
-  for j in $repos_extra ; do
-      if [ "$i" = "$j" ] ; then
-          pull_base="${pull_extra}"
-      fi
-  done
+echo "# Repositories: ${repos} ${repos_extra}" > ${status_output}
+
+if [ "${command}" = "serve" ] ; then
+  # "serve" is run for all the repos as one command.
   (
     (
-      if [ "${command}" = "clone" -o "${command}" = "fclone" ] ; then
-        pull_newrepo="`echo ${pull_base}/${i} | sed -e 's@\([^:]/\)//*@\1@g'`"
-        echo hg clone ${pull_newrepo} ${i}
-        path="`dirname ${i}`"
-        if [ "${path}" != "." ] ; then
-          times=0
-          while [ ! -d "${path}" ]   ## nested repo, ensure containing dir exists
-          do
-            times=`expr ${times} '+' 1`
-            if [ `expr ${times} '%' 10` -eq 0 ] ; then
-              echo ${path} still not created, waiting...
+      cwd=`pwd`
+      serving=`basename ${cwd}`
+      (
+        echo "[web]"
+        echo "description = ${serving}"
+        echo "allow_push = *"
+        echo "push_ssl = False"
+
+        echo "[paths]"
+        for i in ${repos} ; do
+          if [ "${i}" != "." ] ; then
+            echo "/${serving}/${i} = ${i}"
+          else
+            echo "/${serving} = ${cwd}"
+          fi
+        done
+      ) > ${tmp}/serve.web-conf
+
+      echo "serving root repo ${serving}" > ${status_output}
+
+      echo "hg${global_opts} serve" > ${status_output}
+      (PYTHONUNBUFFERED=true hg${global_opts} serve -A ${status_output} -E ${status_output} --pid-file ${tmp}/serve.pid --web-conf ${tmp}/serve.web-conf; echo "$?" > ${tmp}/serve.pid.rc ) 2>&1 &
+    ) 2>&1 | sed -e "s@^@serve:   @" > ${status_output}
+  ) &
+else
+  # Run the supplied command on all repos in parallel.
+
+  # n is the number of subprocess started or which might still be running.
+  n=0
+  if [ ${have_fifos} = "true" ]; then
+    # if we have fifos use them to detect command completion.
+    mkfifo ${tmp}/fifo
+    exec 3<>${tmp}/fifo
+  fi
+
+  # iterate over all of the subrepos.
+  for i in ${repos} ${repos_extra} ; do
+    n=`expr ${n} '+' 1`
+    repopidfile=`echo ${i} | sed -e 's@./@@' -e 's@/@_@g'`
+    reponame=`echo ${i} | sed -e :a -e 's/^.\{1,20\}$/ &/;ta'`
+    pull_base="${pull_default}"
+
+    # regular repo or "extra" repo?
+    for j in ${repos_extra} ; do
+      if [ "${i}" = "${j}" ] ; then
+        # it's an "extra"
+        pull_base="${pull_extra}"
+      fi
+    done
+
+    # remove trailing slash
+    pull_base="`echo ${pull_base} | sed -e 's@[/]*$@@'`"
+
+    # execute the command on the subrepo
+    (
+      (
+        if [ "${command}" = "clone" -o "${command}" = "fclone" -o "${command}" = "tclone" ] ; then
+          # some form of clone
+          clone_newrepo="${pull_base}/${i}"
+          parent_path="`dirname ${i}`"
+          if [ "${parent_path}" != "." ] ; then
+            times=0
+            while [ ! -d "${parent_path}" ] ; do  ## nested repo, ensure containing dir exists
+              if [ "${sflag}" = "true" ] ; then
+                # Missing parent is fatal during sequential operation.
+                echo "ERROR: Missing parent path: ${parent_path}" > ${status_output}
+                exit 1
+              fi
+              times=`expr ${times} '+' 1`
+              if [ `expr ${times} '%' 10` -eq 0 ] ; then
+                echo "${parent_path} still not created, waiting..." > ${status_output}
+              fi
+              sleep 5
+            done
+          fi
+          # run the clone command.
+          echo "hg${global_opts} clone ${clone_newrepo} ${i}" > ${status_output}
+          (PYTHONUNBUFFERED=true hg${global_opts} clone ${clone_newrepo} ${i}; echo "$?" > ${tmp}/${repopidfile}.pid.rc ) 2>&1 &
+        else
+          # run the command.
+          echo "cd ${i} && hg${global_opts} ${command} ${command_args}" > ${status_output}
+          cd ${i} && (PYTHONUNBUFFERED=true hg${global_opts} ${command} ${command_args}; echo "$?" > ${tmp}/${repopidfile}.pid.rc ) 2>&1 &
+        fi
+
+        echo $! > ${tmp}/${repopidfile}.pid
+      ) 2>&1 | sed -e "s@^@${reponame}:   @" > ${status_output}
+      # tell the fifo waiter that this subprocess is done.
+      if [ ${have_fifos} = "true" ]; then
+        echo "${i}" >&3
+      fi
+    ) &
+
+    if [ "${sflag}" = "true" ] ; then
+      # complete this task before starting another.
+      wait
+    else
+      if [ "${have_fifos}" = "true" ]; then
+        # check on count of running subprocesses and possibly wait for completion
+        if [ ${n} -ge ${at_a_time} ] ; then
+          # read will block until there are completed subprocesses
+          while read repo_done; do
+            n=`expr ${n} '-' 1`
+            if [ ${n} -lt ${at_a_time} ] ; then
+              # we should start more subprocesses
+              break;
             fi
-            sleep 5
-          done
+          done <&3
         fi
-        (PYTHONUNBUFFERED=true hg clone ${pull_newrepo} ${i}; echo "$?" > ${tmp}/${repopidfile}.pid.rc )&
       else
-        echo "cd ${i} && hg $*"
-        cd ${i} && (PYTHONUNBUFFERED=true hg "$@"; echo "$?" > ${tmp}/${repopidfile}.pid.rc )&
+        # Compare completions to starts
+        completed="`(ls -a1 ${tmp}/*.pid.rc 2> /dev/null | wc -l) || echo 0`"
+        while [ `expr ${n} '-' ${completed}` -ge ${at_a_time} ] ; do
+          # sleep a short time to give time for something to complete
+          sleep 1
+          completed="`(ls -a1 ${tmp}/*.pid.rc 2> /dev/null | wc -l) || echo 0`"
+        done
       fi
-      echo $! > ${tmp}/${repopidfile}.pid
-    ) 2>&1 | sed -e "s@^@${reponame}:   @") &
+    fi
+  done
+fi
 
-  if [ `expr ${n} '%' ${at_a_time}` -eq 0 ] ; then
-    sleep 2
-    echo Waiting 5 secs before spawning next background command.
-    sleep 3
-  fi
-done
-# Wait for all hg commands to complete
+# Wait for all subprocesses to complete
 wait
 
 # Terminate with exit 0 only if all subprocesses were successful
 ec=0
 if [ -d ${tmp} ]; then
-  for rc in ${tmp}/*.pid.rc ; do
+  rcfiles="`(ls -a ${tmp}/*.pid.rc 2> /dev/null) || echo ''`"
+  for rc in ${rcfiles} ; do
     exit_code=`cat ${rc} | tr -d ' \n\r'`
     if [ "${exit_code}" != "0" ] ; then
-      echo "WARNING: ${rc} exited abnormally."
+      repo="`echo ${rc} | sed -e 's@^'${tmp}'@@' -e 's@/*\([^/]*\)\.pid\.rc$@\1@' -e 's@_@/@g'`"
+      echo "WARNING: ${repo} exited abnormally (${exit_code})" > ${status_output}
       ec=1
     fi
   done
diff --git a/get_source.sh b/get_source.sh
index f83a3766c1292dbedfe74189d093494b0e1226eb..5e874d1cb517005803da0046efaa65c0e181f827 100644
--- a/get_source.sh
+++ b/get_source.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -25,9 +25,76 @@
 # questions.
 #
 
-# Get clones of all nested repositories
-sh ./common/bin/hgforest.sh clone "$@" || exit 1
+to_stderr() {
+    echo "$@" >&2
+}
+
+error() {
+    to_stderr "ERROR: $1"
+    exit ${2:-126}
+}
+
+warning() {
+    to_stderr "WARNING: $1"
+}
+
+version_field() {
+  # rev is typically omitted for minor and major releases
+  field=`echo ${1}.0 | cut -f ${2} -d .`
+  if expr 1 + $field >/dev/null 2> /dev/null; then
+    echo $field
+  else
+    echo -1
+  fi
+}
+
+# Version check
+
+# required
+reqdmajor=1
+reqdminor=4
+reqdrev=0
+
+# requested
+rqstmajor=2
+rqstminor=6
+rqstrev=3
+
+
+# installed
+hgwhere="`command -v hg`"
+if [ "x$hgwhere" = "x" ]; then
+  error "Could not locate Mercurial command"
+fi
+
+hgversion="`hg --version 2> /dev/null | sed -n -e 's@^Mercurial Distributed SCM (version \([^+]*\).*)\$@\1@p'`"
+if [ "x${hgversion}" = "x" ] ; then
+  error "Could not determine Mercurial version of $hgwhere"
+fi
+
+hgmajor="`version_field $hgversion 1`"
+hgminor="`version_field $hgversion 2`"
+hgrev="`version_field $hgversion 3`"
+
+if [ $hgmajor -eq -1 -o $hgminor -eq -1 -o $hgrev -eq -1 ] ; then
+  error "Could not determine Mercurial version of $hgwhere from \"$hgversion\""
+fi
+
+
+# Require
+if [ $hgmajor -lt $reqdmajor -o \( $hgmajor -eq $reqdmajor -a $hgminor -lt $reqdminor \) -o \( $hgmajor -eq $reqdmajor -a $hgminor -eq $reqdminor -a $hgrev -lt $reqdrev \) ] ; then
+  error "Mercurial version $reqdmajor.$reqdminor.$reqdrev or later is required. $hgwhere is version $hgversion"
+fi
+
+
+# Request
+if [ $hgmajor -lt $rqstmajor -o \( $hgmajor -eq $rqstmajor -a $hgminor -lt $rqstminor \) -o \( $hgmajor -eq $rqstmajor -a $hgminor -eq $rqstminor -a $hgrev -lt $rqstrev \) ] ; then
+  warning "Mercurial version $rqstmajor.$rqstminor.$rqstrev or later is recommended. $hgwhere is version $hgversion"
+fi
+
+
+# Get clones of all absent nested repositories (harmless if already exist)
+sh ./common/bin/hgforest.sh clone "$@" || exit $?
 
 # Update all existing repositories to the latest sources
 sh ./common/bin/hgforest.sh pull -u
-