#!/bin/sh
### ====================================================================== ###
##                                                                          ##
##  This is the main entry point for the build system.                      ##
##                                                                          ##
##  Users should execute this file rather than 'mvn' to ensure              ##
##  the correct version is being used with the correct configuration.       ##
##                                                                          ##
### ====================================================================== ###

# $Id: build.sh 91007 2009-07-09 14:39:25Z pgier $

PROGNAME=`basename $0`
DIRNAME=`dirname $0`
GREP="grep"
ROOT="/"

# Ignore user's MAVEN_HOME if it is set
MAVEN_HOME=""

# the default search path for maven
MAVEN_SEARCH_PATH="\
    tools
    tools/maven \
    tools/apache/maven \
    maven"

# the default arguments
MVN_OPTIONS=""

# Use the maximum available, or set MAX_FD != -1 to use that
MAX_FD="maximum"

# OS specific support (must be 'true' or 'false').
cygwin=false;
darwin=false;
case "`uname`" in
    CYGWIN*)
        cygwin=true
        ;;

    Darwin*)
        darwin=true
        ;;
esac

#
# Helper to complain.
#
die() {
    echo "${PROGNAME}: $*"
    exit 1
}

#
# Helper to complain.
#
warn() {
    echo "${PROGNAME}: $*"
}

#
# Helper to source a file if it exists.
#
maybe_source() {
    for file in $*; do
	if [ -f "$file" ]; then
	    . $file
	fi
    done
}

search() {
    search="$*"
    for d in $search; do
	MAVEN_HOME="`pwd`/$d"
	MVN="$MAVEN_HOME/bin/mvn"
	if [ -x "$MVN" ]; then
	    # found one
	    echo $MAVEN_HOME
	    break
	fi
    done
}

#
# Main function.
#
main() {
    # if there is a build config file. then source it
    maybe_source "$DIRNAME/build.conf" "$HOME/.build.conf"

    # Increase the maximum file descriptors if we can
    if [ $cygwin = "false" ]; then
	MAX_FD_LIMIT=`ulimit -H -n`
	if [ $? -eq 0 ]; then
	    if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ]; then
		# use the system max
		MAX_FD="$MAX_FD_LIMIT"
	    fi

	    ulimit -n $MAX_FD
	    if [ $? -ne 0 ]; then
		warn "Could not set maximum file descriptor limit: $MAX_FD"
	    fi
	else
	    warn "Could not query system maximum file descriptor limit: $MAX_FD_LIMIT"
	fi
    fi

    # try the search path
    MAVEN_HOME=`search $MAVEN_SEARCH_PATH`

    # try looking up to root
    if [ "x$MAVEN_HOME" = "x" ]; then
	target="build"
	_cwd=`pwd`

	while [ "x$MAVEN_HOME" = "x" ] && [ "$cwd" != "$ROOT" ]; do
	    cd ..
	    cwd=`pwd`
	    MAVEN_HOME=`search $MAVEN_SEARCH_PATH`
	done

	# make sure we get back
	cd $_cwd

	if [ "$cwd" != "$ROOT" ]; then
	    found="true"
	fi

	# complain if we did not find anything
	if [ "$found" != "true" ]; then
	    die "Could not locate Maven; check \$MVN or \$MAVEN_HOME."
	fi
    fi

    # make sure we have one
    MVN=$MAVEN_HOME/bin/mvn
    if [ ! -x "$MVN" ]; then
	die "Maven file is not executable: $MVN"
    fi

    # need to specify planet57/buildmagic protocol handler package
    MVN_OPTS="-Djava.protocol.handler.pkgs=org.jboss.net.protocol"

    # setup some build properties
    MVN_OPTS="$MVN_OPTS -Dbuild.script=$0"

    # change to the directory where the script lives so users are not forced
    # to be in the same directory as build.xml
    cd $DIRNAME

    MVN_GOAL=$@
    if [ -z "$MVN_GOAL" ]; then
      MVN_GOAL="install"
    fi
    
    # export some stuff for maven
    export MVN MAVEN_HOME MVN_OPTS MVN_GOAL

    
    # execute in debug mode, or simply execute
    if [ "x$MVN_DEBUG" != "x" ]; then
	  /bin/sh -x $MVN $MVN_OPTIONS $MVN_GOAL
    else
	  exec $MVN $MVN_OPTIONS $MVN_GOAL
    fi
}

##
## Bootstrap
##

main "$@"
