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#!/bin/bash
#
# Script to clean binary files.
#
# JPackage Project <http://www.jpackage.org/>
#

# Import java functions
[ -r "/usr/share/java-utils/java-functions" ] \
 &&  . "/usr/share/java-utils/java-functions" || exit 1

# Prints help message
usage() {
	cat >&2 << EOF_USAGE

Usage: $0 {[-f {-, instructions_file}], [-e exclusion_file] [-l]} [-a archive_file] [-d custom_jar_map] [-n] [-p] [-s] 

Options:
	-f - The instructions file, specifying which files to keep and which
	     to remove
	-e - The exclusions file, specifying special binary files that are to
	     be preserved, or non-binary files that are to be removed.
	-l - Only list instructions (to put in instructions file), do not delete anything.
	-a - Archive file on which actions will be performed, as opposed to 
	     current directory
	-d - A custom jar map file (has priority over the generic one).
	-n - No symlinks (i.e. only clean jars, don't run build-jar-repository afterwards)
	-p - Preserve original file names (-p to build-jar-repository)
	-s - Silent mode. Won't output commands during cleanup
EOF_USAGE
	exit 2
}

[ "$1" = "--help" ] && usage

[ "$#" = 0 ] && usage

set_javacmd || exit 3
check_java_env || exit 4
set_jvm_dirs || exit 5

# Directory in which script was invoked
_WORKING_DIR=`pwd`

# Default jar map
_JAR_MAP_FILE="/usr/share/java-utils/jarname-jpp-map"

# Variables used for comparing file lists
_TEMP_COMPARISON_FILE=/tmp/_temp_comparison_file.$$
_KEEP_REMOVE_FILELIST=/tmp/_kr_file.$$
_ON_DISK_FILELIST=/tmp/_fnlist_file.$$
_FILELIST_DIFF=/tmp/_filelist_diff_file.$$
rm -f $_KEEP_REMOVE_FILELIST $_ON_DISK_FILELIST $_FILELIST_DIFF

# Temporary instructions file
_TEMP_INSTRUCTIONS_FILE=/tmp/_temp_instruction_file.$$

# Directory where archive is extracted, if we are working with one
_ARCHIVE_EXTRACTION_DIR=/tmp/_cbr_archive_dir.$$

# MODE can be list, list_and_delete, or delete
_MODE="list_and_delete"

# Run-time variables
_ARCHIVE_FILE=""
_INSTRUCTIONS_FILE=""
_EXCEPTIONS_FILE=""
_KEEP_LIST=""
_PRESERVE_BINARY_NAMES=0
_REMOVE_LIST=""
_SILENT_MODE=0
_CREATE_SYMLINKS=1
_CUSTOM_JAR_MAP_FILE=""

# Adds to the appropriate (keep/remove) list
add_to_keep_or_remove_list() {

	if [ $1 = "keep" ]; then

		shift

		if [ -z "$_KEEP_LIST" ]; then
			_KEEP_LIST=$*
		else
			_KEEP_LIST=${_KEEP_LIST}"|"$*
		fi
	else

		shift

		if [ -z "$_REMOVE_LIST" ]; then
			_REMOVE_LIST=$*
		else
			_REMOVE_LIST=${_REMOVE_LIST}"|"$*
		fi
	fi
}

# Function to check against exclusion generate the 
# keep/remove command
check_and_generate_command() {

	_old_ifs=$IFS
	IFS='|'

	echo $1 | grep -E "\\.jar$" >& /dev/null
	if [ $? -eq 0 ]; then

		# Check if the item is in the exclusion list
		_exclude=0

		for excluded in $_KEEP_LIST; do
			if [ "$1" = "$excluded" ]; then
				_exclude=1
				break
			fi
		done

		if [ $_exclude -eq 0 ]; then
			output_command "remove $1"
		else
			output_command "keep $1"
		fi
	fi

	IFS=$_old_ifs
}

# Function to delete files
delete_and_replace_file() {

	rm -f "$1"
	print "rm -f \"$1\""

	# Now find the appropriate jar in the map, and output the 
	# build-jar-repository command
	execute_bjr_command $1
}

# Ensures that the file exists
ensure_exclusion_files_exist() {

	rm -f $_ON_DISK_FILELIST
	touch $_ON_DISK_FILELIST

	# Generate a list of binary files on disk

	_filter="\\.jar$"

	if [ ! "$_KEEP_LIST" = "" ]; then
		_filter="$_filter|$_KEEP_LIST"
	fi

	if [ ! "$_REMOVE_LIST" = "" ]; then
		_filter="$_filter|$_REMOVE_LIST"
	fi

	find . | sed -e s:^./::g | grep -E "$_filter" | sort -u > $_ON_DISK_FILELIST

	_old_ifs=$IFS
	IFS='|'
	
	for filename in $_KEEP_LIST; do
		grep ^$filename $_ON_DISK_FILELIST >& /dev/null
		if [ $? -gt 0 ]; then
			echo "Cannot find file $filename from exclusions list. Aborting."

			rm -f $_ON_DISK_FILELIST
			IFS=$_old_ifs

			exit 7
		fi
	done

	for filename in $_REMOVE_LIST; do
		grep ^$filename $_ON_DISK_FILELIST >& /dev/null
		if [ $? -gt 0 ]; then
			echo "Cannot find file $filename from exclusions list. Aborting."

			rm -f $_ON_DISK_FILELIST
			IFS=$_old_ifs

			exit 7
		fi
	done

	rm -f $_ON_DISK_FILELIST
	IFS=$_old_ifs
}

# Ensures that files in kee/remove list exist on disk, and vice-versa
ensure_files_exist() {
	rm -f $_TEMP_COMPARISON_FILE
	touch $_TEMP_COMPARISON_FILE

	_old_ifs=$IFS
	IFS='|'

	for filename in $_REMOVE_LIST; do
		echo $filename >> $_TEMP_COMPARISON_FILE
	done

	for filename in $_KEEP_LIST; do
		echo $filename >> $_TEMP_COMPARISON_FILE
	done

	IFS=$_old_ifs

	sort -u --output=$_KEEP_REMOVE_FILELIST $_TEMP_COMPARISON_FILE
	rm -f $_TEMP_COMPARISON_FILE

	# We have a list of keep/remove items. Now generate a list of
	# binary files on disk

	_filter="\\.jar$"

	if [ ! "$_KEEP_LIST" = "" ]; then
		_filter="$_filter|$_KEEP_LIST"
	fi

	if [ ! "$_REMOVE_LIST" = "" ]; then
		_filter="$_filter|$_REMOVE_LIST"
	fi

	find . | sed -e s:^./::g | grep -E "$_filter" | sort -u > $_ON_DISK_FILELIST

	# Now compare the two
	diff -c $_KEEP_REMOVE_FILELIST $_ON_DISK_FILELIST > $_FILELIST_DIFF
	rm -f $_KEEP_REMOVE_FILELIST $_ON_DISK_FILELIST

	if [ -s $_FILELIST_DIFF ]; then
		echo "ERROR: Extraneous files were found."
		echo ""
		echo "Files in keep/remove list, but not on disk/archive:"
		cat $_FILELIST_DIFF | grep "^- " | sed -e s:"^- "::g

		echo ""
		echo "Binary files in on disk/archive, but not in keep/remove list:"
		cat $_FILELIST_DIFF | grep "^+ " | sed -e s:"^+ "::g

		echo ""
		echo "Indistinguishable files:"
		cat $_FILELIST_DIFF | grep "^\! " | sed -e s:"^\! "::g

		rm -f $_FILELIST_DIFF
		exit 7
	fi

	rm -f $_FILELIST_DIFF
}

# Executes the build-jar-repository command
execute_bjr_command() {

	if [ $_CREATE_SYMLINKS -eq 0 ]; then
		return 0;
	fi

	echo $1 | grep -E "\\.jar$" >& /dev/null
	if [ ! $? -eq 0 ]; then
		return 0
	fi

	# Strip version and extention. e.g. abc-2.1-api-1.0.4.jar -> abc-2.1-api
	_jar_filename=`basename $1`
	_search_name=`basename $1`
	_search_name=`echo $_search_name | sed -r -e s/-[[:digit:].]*\\\.jar//g | sed -r -e s/\\\.jar$//g`

	_mapped_jar_name=""
	_final_name=""

	# Search in custom jar map first
	if [ ! "$_CUSTOM_JAR_MAP_FILE" = "" ] && [ -f $_CUSTOM_JAR_MAP_FILE ]; then
		# echo "grep -E \"^$_search_name.jar \" $_CUSTOM_JAR_MAP_FILE | awk '{print $2}'"
		_mapped_jar_name=`grep -E "^$_search_name\\.jar " $_CUSTOM_JAR_MAP_FILE | awk '{print $2}'`

		if [ "$_mapped_jar_name" = "" ]; then
			_mapped_jar_name=`grep -E "^$_jar_filename " $_CUSTOM_JAR_MAP_FILE | awk '{print $2}'`
		fi
	fi

	# Search in global jar map ONLY IF things were not found in the custom map
	if [ -f $_JAR_MAP_FILE ] && [ "$_mapped_jar_name" = "" ]; then
		# echo "grep -E \"^$_search_name.jar \" $_JAR_MAP_FILE | awk '{print $2}'"
		_mapped_jar_name=`grep -E "^$_search_name\\.jar " $_JAR_MAP_FILE | awk '{print $2}'`
	fi

	if [ "$_mapped_jar_name" = "" ]; then
		_final_name=$_search_name
	else
		_final_name=$_mapped_jar_name
	fi

	_preserve_name_flag=""
	if [ $_PRESERVE_BINARY_NAMES = 1 ]; then
		_preserve_name_flag="-p"
	fi

	_target_dir=`dirname $1`

	_old_ifs=$IFS
	IFS='
'

	for jppname in $_final_name; do
		print "build-jar-repository -s $_preserve_name_flag $_target_dir $jppname"
		build-jar-repository -s $_preserve_name_flag $_target_dir $jppname
	done

	IFS=$_old_ifs

}

# Outputs command to either STDOUT, or to a temp file, depending on what is required
output_command() {
	if [ $_MODE = "list" ]; then
		echo $*
	elif [ $_MODE = "list_and_delete" ]; then
		echo $* >> $_TEMP_INSTRUCTIONS_FILE
	fi
}

# Outputs to STDOUT (depending on whether or not we are in silent mode)
print() {
	if [ $_SILENT_MODE -eq 0 ]; then
		echo $*
	fi
}

## BEGIN EXECUTION

# Get the command line options and set up appropriate parameters
while [ $# -gt 0 ] ; do
	case "$1" in
		-e) # Exclusion list (LIST MODE)

			if [ ! -f $2 ] ; then
				echo "$0: ERROR: Could not find exclusions file!"
				exit 6;
			fi

			while read line; do

				echo $line | grep ^% >& /dev/null
				if [ $? -eq 0 ] || [ "$line" = "" ]; then
					continue
				fi

 				_type=`echo $line | awk '{print $1}'`
 				_value=`echo $line | awk '{ printf "%s", $2; for (i = 3; i <= NF; i=i+1) printf " %s", $i }'`

 				if [ $_type = "keep" ]; then
 					if [ -z "$_KEEP_LIST" ]; then
 						_KEEP_LIST=$_value
 					else
 						_KEEP_LIST=${_KEEP_LIST}"|"$_value
 					fi
 				else
 					if [ -z "$_REMOVE_LIST" ]; then
 						_REMOVE_LIST=$_value
 					else
 						_REMOVE_LIST=${_REMOVE_LIST}"|"$_value
 					fi
 				fi

			done < $2


			if [ ! "$_MODE" = "list" ]; then

				# If program had previously crashed, the temp file could be there. Remove it
				rm -f $_TEMP_INSTRUCTIONS_FILE

				_MODE="list_and_delete"
			fi

			if [ ! "$_INSTRUCTIONS_FILE" = "" ]; then
				echo "ERROR: -e and -f are mutually exclusive options"
				exit 6
			fi

			_EXCEPTIONS_FILE=$2

			shift
		;;
		-f) # Instruction file (DELETE MODE)

			if [ $2 == "-" ]; then

				while read command; do

					_type=`echo $command | awk '{print $1}'`
					_value=`echo $command | awk '{ printf "%s", $2; for (i = 3; i <= NF; i=i+1) printf " %s", $i }'`

					add_to_keep_or_remove_list $_type $_value

				done

			else

				if [ ! -f $2 ] ; then
					echo "$0: ERROR: Could not find instructions file!"
					exit 6;
				fi


				while read line; do

					echo $line | grep ^% >& /dev/null
					if [ $? -eq 0 ] || [ "$line" = "" ]; then
						continue
					fi

					_type=`echo $line | awk '{print $1}'`
					_value=`echo $line | awk '{ printf "%s", $2; for (i = 3; i <= NF; i=i+1) printf " %s", $i }'`

					add_to_keep_or_remove_list $_type $_value

				done < $2

				_INSTRUCTIONS_FILE=$2

			fi

			if [ "$_MODE" = "list" ]; then
				echo "ERROR: -f and -l are mutually exclusive options"
				exit 6
			fi

			if [ ! "$_EXCEPTIONS_FILE" = "" ]; then
				echo "ERROR: -e and -f are mutually exclusive options"
				exit 6
			fi

			_MODE=delete

			shift
		;;
		-l)

			if [ "$_MODE" = "delete" ]; then
				echo "ERROR: -f and -l are mutually exclusive options"
				exit 6
			fi

			_MODE=list
		;;
		-a)
			_ARCHIVE_FILE=$2
			shift
		;;
		-d)
			_CUSTOM_JAR_MAP_FILE=$2
			shift
		;;
		-n)
			_CREATE_SYMLINKS=0
		;;
		-p)
			_PRESERVE_BINARY_NAMES=1
		;;
		-s)
			_SILENT_MODE=1
		;;
		*)
			echo "ERROR: Unknown argument $1"
			exit 6
		;;
	esac
	shift
done

# Are basic arguments given?

if [ -z "$_EXCEPTIONS_FILE" ] && [ -z "$_INSTRUCTIONS_FILE" ]; then
	echo "ERROR: One of -f or -e is required!"
	exit 6
fi

# Now, carry out the actions

# If we are dealing with an archive file, we need to extract things somewhere, and do our actions in there
if [ ! -z $_ARCHIVE_FILE ]; then
	rm -rf $_ARCHIVE_EXTRACTION_DIR
	mkdir -p $_ARCHIVE_EXTRACTION_DIR
	pushd $_ARCHIVE_EXTRACTION_DIR >& /dev/null
	tar xf $_WORKING_DIR/`basename $_ARCHIVE_FILE`
fi

# If in delete mode, we need to clean up the binary files

if [ $_MODE = "delete" ]; then

	# First, ensure that files in keep/remove lists exist on disk, and vice-versa
	ensure_files_exist

	_old_ifs=$IFS
	IFS='|'

	for filename in $_REMOVE_LIST; do
		delete_and_replace_file $filename
	done

	IFS=$_old_ifs

else

	# Else, in list mode, we list the actions that will go into the instructions file

	# Ensure that files in both lists exist
	ensure_exclusion_files_exist

	# Generate a list of files, and subsequently, the commands

	_old_ifs=$IFS

	IFS='
'

	for filename in `find . | grep .jar$ | sed -e s:^./::g`; do
		check_and_generate_command $filename
	done

	IFS=$_old_ifs

	# Add all of the "remove" commands from the exclusion list
	_old_ifs=$IFS
	IFS='|'

	for filename in $_REMOVE_LIST; do
		output_command "remove $filename"
	done;

	IFS=$_old_ifs

	if [ $_MODE = "list_and_delete" ]; then

		_instructions_file_flag="-f"
		_instructions_file="$_TEMP_INSTRUCTIONS_FILE"

		_silent_mode_flag=""
		if [ $_SILENT_MODE = 1 ]; then
			_silent_mode_flag="-s"
		fi

		_preserve_names_flag=""
		if [ $_PRESERVE_BINARY_NAMES = 1 ]; then
			_preserve_names_flag="-p"
		fi

		_no_symlinks_flag=""
		if [ $_CREATE_SYMLINKS = 0 ]; then
			_no_symlinks_flag="-n"
		fi

		_custom_map_flag=""
		_custom_map=""
		if [ ! "$_CUSTOM_JAR_MAP_FILE" = "" ]; then
			_custom_map_flag="-d"
			_custom_map="$_CUSTOM_JAR_MAP_FILE"
		fi

		#echo "$0 $_instructions_file_flag $_instructions_file $_preserve_names_flag $_silent_mode_flag $_no_symlinks_flag $_custom_map_flag $_custom_map"
		#$0 $_instructions_file_flag $_instructions_file $_preserve_names_flag $_silent_mode_flag $_no_symlinks_flag $_custom_map_flag $_custom_map
		clean-binary-files $_instructions_file_flag $_instructions_file $_preserve_names_flag $_silent_mode_flag $_no_symlinks_flag $_custom_map_flag $_custom_map
		rm -f $_TEMP_INSTRUCTIONS_FILE
	fi

fi

if [ ! -z $_ARCHIVE_FILE ]; then
	_archive_basename=`basename $_ARCHIVE_FILE`
	_arch_name=${_archive_basename%%.*}
	_arch_ext=${_archive_basename#*.}

	_compression_flag=""

	echo $_ARCHIVE_FILE | grep gz$ >& /dev/null
	if [ $? -eq 0 ]; then
		_compression_flag=z
	fi

	echo $_ARCHIVE_FILE | grep bz2$ >& /dev/null
	if [ $? -eq 0 ]; then
		_compression_flag=f
	fi

	tar cf$_compression_flag $_WORKING_DIR/$_arch_name-clean.$_arch_ext *

	popd >& /dev/null

	rm -rf $_ARCHIVE_EXTRACTION_DIR
fi