7003845: README-builds document proper location of forest extension, provide alternatives

Reviewed-by: robilad

README

 README:
-  This file should be located at the top of the OpenJDK Mercurial repository
-  forest. This top or enclosing repository will include a "make" directory,
-  and a Makefile at the very top of the repository.
-  It should also include the 6 repositories: "jdk", "hotspot", "langtools",
-  "corba", "jaxws"  and "jaxp".
+  This file should be located at the top of the OpenJDK Mercurial root
+  repository. This root repository will include a "make" directory,
+  and a Makefile for building the entire OpenJDK.
+  A full OpenJDK repository set (forest) should also include the following
+  6 nested repositories:
+    "jdk", "hotspot", "langtools", "corba", "jaxws"  and "jaxp".
+  There are also several source downloads for the jax* repositories that
+  will be needed.
+
+  This one root repository can be obtained with something like:
+    hg clone http://hg.openjdk.java.net/jdk7/jdk7 openjdk7
+  To make sure you have all the nested repositories, you can run:
+    cd openjdk7 && sh ./get_source.sh
+  (This is identical to using the Mercurial Forest Extension command 
+   'hg fclone http://hg.openjdk.java.net/jdk7/jdk7 openjdk7').
+  People unfamiliar with Mercurial should read the first few chapters of
+  the Mercurial book: http://hgbook.red-bean.com/read/
 
   See http://openjdk.java.net/ for more information about the OpenJDK.
 
 Simple Build Instructions:
+  
+  0. Get the necessary system software/packages installed on your system, see
+     http://hg.openjdk.java.net/jdk7/build/raw-file/tip/README-builds.html
 
-  1. Download and install a JDK 6 from
+  1. If you don't have a jdk6 installed, download and install a JDK 6 from
      http://java.sun.com/javase/downloads/index.jsp
-     Set the environment variable ALT_BOOTDIR to the location of this JDK 6.
+     Set the environment variable ALT_BOOTDIR to the location of JDK 6.
 
-  2. Download and install the Binary Plugs for the most recent JDK7 from
-     http://download.java.net/openjdk/jdk7/
-     Set the environment variable ALT_BINARY_PLUGS_PATH to the location of
-     these binary plugs.
-     
-  3. Check the sanity of doing a build with the current machine:
+  2. Check the sanity of doing a build with your current system:
        gnumake sanity
      See README-builds.html if you run into problems.
   
-  4. Do a complete build of the jdk:
+  3. Do a complete build of the OpenJDK:
        gnumake all
      The resulting JDK image should be found in build/*/j2sdk-image
 

get_source.sh

+#!/bin/sh
+
+#
+# Copyright (c) 2010, 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
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.  Oracle designates this
+# particular file as subject to the "Classpath" exception as provided
+# by Oracle in the LICENSE file that accompanied this code.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#
+
+# Get clones of all nested repositories
+sh ./make/scripts/hgforest.sh clone
+
+# Update all existing repositories to the latest sources
+sh ./make/scripts/hgforest.sh pull -u
+

make/scripts/hgforest.sh

+#!/bin/sh
+
+#
+# Copyright (c) 2009, 2010, 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
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#
+
+# Shell script for a fast parallel forest command
+
+tmp=/tmp/forest.$$
+rm -f -r ${tmp}
+mkdir -p ${tmp}
+
+# Remove tmp area on A. B. Normal termination
+trap 'rm -f -r ${tmp}' KILL
+trap 'rm -f -r ${tmp}' EXIT
+
+# Only look in specific locations for possible forests (avoids long searches)
+pull_default=""
+if [ "$1" = "clone" -o "$1" = "fclone" ] ; then
+  subrepos="corba jaxp jaxws langtools jdk hotspot"
+  if [ -f .hg/hgrc ] ; then
+    pull_default=`hg paths default`
+  fi
+  if [ "${pull_default}" = "" ] ; then
+    echo "ERROR: Need initial clone with 'hg paths default' defined"
+    exit 1
+  fi
+  repos=""
+  for i in ${subrepos} ; do
+    if [ ! -f ${i}/.hg/hgrc ] ; then
+      repos="${repos} ${i}"
+    fi
+  done
+  at_a_time=2
+else
+  hgdirs=`ls -d ./.hg ./*/.hg ./*/*/.hg ./*/*/*/.hg ./*/*/*/*/.hg 2>/dev/null`
+  # Derive repository names from the .hg directory locations
+  repos=""
+  for i in ${hgdirs} ; do
+    repos="${repos} `echo ${i} | sed -e 's@/.hg$@@'`"
+  done
+  at_a_time=8
+fi
+
+# Any repos to deal with?
+if [ "${repos}" = "" ] ; then
+  echo "No repositories to process."
+  exit
+fi
+
+# Echo out what repositories we will process
+echo "# Repos: ${repos}"
+
+# Run the supplied command on all repos in parallel, save output until end
+n=0
+for i in ${repos} ; do
+  echo "Starting on ${i}"
+  n=`expr ${n} '+' 1`
+  (
+    (
+      if [ "$1" = "clone" -o "$1" = "fclone" ] ; then
+        cline="hg $* ${pull_default}/${i} ${i}"
+        echo "# ${cline}"
+        ( eval "${cline}" )
+      else
+        cline="hg $*"
+        echo "# cd ${i} && ${cline}"
+        ( cd ${i} && eval "${cline}" )
+      fi
+      echo "# exit code $?"
+    ) > ${tmp}/repo.${n} 2>&1 ; cat ${tmp}/repo.${n} ) &
+  if [ `expr ${n} '%' ${at_a_time}` -eq 0 ] ; then
+    sleep 5
+  fi
+done
+
+# Wait for all hg commands to complete
+wait
+
+# Cleanup
+rm -f -r ${tmp}
+
+# Terminate with exit 0 all the time (hard to know when to say "failed")
+exit 0
+