#!/bin/sh

#

# Copyright (c) 2009, 2012, 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

command="$1"

pull_extra_base="$2"

# Python always buffers stdout significantly, thus we will not see any output from hg clone jdk,

# until a lot of time has passed! By passing -u to python, we get incremental updates

# on stdout. Much nicer.

whichhg="`which hg`"

if [ "${whichhg}" = "" ] ; then

  echo Cannot find hg!

  exit 1

fi

if [ "" = "$command" ] ; then

  echo No command to hg supplied!

  exit 1

fi

has_hash_bang="`head -n 1 "${whichhg}" | cut -b 1-2`"

python=""

bpython=""

if [ "#!" = "$has_hash_bang" ] ; then

   python="`head -n 1 ${whichhg} | cut -b 3-`"

   bpython="`basename "$python"`"

fi

if [ "python" = "$bpython" -a -x "$python" ] ; then

  hg="${python} -u ${whichhg}"

else

  echo Cannot find python from hg launcher. Running plain hg, which probably has buffered stdout.

  hg="hg"

fi

# Clean out the temporary directory that stores the pid files.

tmp=/tmp/forest.$$

rm -f -r ${tmp}

mkdir -p ${tmp}

safe_interrupt () {

  if [ -d ${tmp} ]; then

    if [ "`ls ${tmp}/*.pid`" != "" ]; then

      echo "Waiting for processes ( `cat ${tmp}/*.pid | tr '\n' ' '`) to terminate nicely!"

      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!

    fi

  fi

  rm -f -r ${tmp}

  exit 1

}

nice_exit () {

  if [ -d ${tmp} ]; then

    if [ "`ls ${tmp}`" != "" ]; then

      wait

    fi

  fi

  rm -f -r ${tmp}

}

trap 'safe_interrupt' INT QUIT

trap 'nice_exit' EXIT

# Only look in specific locations for possible forests (avoids long searches)

pull_default=""

repos=""

repos_extra=""

if [ "${command}" = "clone" -o "${command}" = "fclone" ] ; then

  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

  fi

  if [ "${pull_default}" = "" ] ; then

    echo "ERROR: Need initial repository to use this script"

    exit 1

  fi

  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}"

    for i in ${subrepos_extra} ; do

      if [ ! -f ${i}/.hg/hgrc ] ; then

        repos_extra="${repos_extra} ${i}"

      fi

    done

  fi

  at_a_time=2

  # Any repos to deal with?

  if [ "${repos}" = "" -a "${repos_extra}" = "" ] ; then

    exit

  fi

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}"

    fi

  done

  at_a_time=8

  # Any repos to deal with?

  if [ "${repos}" = "" ] ; then

    echo "No repositories to process."

    exit

  fi

  if [ "${locked}" != "" ] ; then

    echo "These repositories are locked: ${locked}"

    exit

  fi

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

  (

    (

      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...

            fi

            sleep 5

          done

        fi

        (${hg} clone ${pull_newrepo} ${i}; echo "$?" > ${tmp}/${repopidfile}.pid.rc )&

      else

        echo "cd ${i} && ${hg} $*"

        cd ${i} && (${hg} "$@"; echo "$?" > ${tmp}/${repopidfile}.pid.rc )&

      fi

      echo $! > ${tmp}/${repopidfile}.pid

    ) 2>&1 | sed -e "s@^@${reponame}:   @") &

  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

# Terminate with exit 0 only if all subprocesses were successful

ec=0

if [ -d ${tmp} ]; then

  for rc in ${tmp}/*.pid.rc ; do

    exit_code=`cat ${rc} | tr -d ' \n\r'`

    if [ "${exit_code}" != "0" ] ; then

      echo "WARNING: ${rc} exited abnormally."

      ec=1

    fi

  done

fi

exit ${ec}