Revert "frontend: properly handle option processing"

This reverts commit 6b7c8ed4bf15175299729355f04d60dcbac1aded as it's
breaking multi-value space-separated parameters.

3 files changed, 27 insertions, 92 deletions

diff --git a/functions/arguments.sh b/functions/arguments.sh
index b10a82532..c40bab4ca 100755
--- a/functions/arguments.sh
+++ b/functions/arguments.sh
@@ -11,84 +11,23 @@
 
 Arguments ()
 {
-	# This function is used for handling arguments both at the frontend (`lb`)
-	# level and at the command level, since both accept almost the same basic
-	# argument set, with little difference in response to them.
-	#
-	# We enlist the help of getopt here which takes care of some of the
-	# intricacies of parsing for us. Note that getopt does not itself
-	# understand the concept of "command" arguments, and the behaviour of it
-	# shuffling non-options (those arguments that are not options or option
-	# values) to the end of the argument list would present a difficulty, if it
-	# were not for the fact that you can control this behaviour with use of the
-	# `POSIXLY_CORRECT` environment variable; setting this variable causes
-	# getopt to stop parsing arguments once it encounters the first non-option,
-	# treating all remaining arguments as being non-options. Note also that
-	# getopt always outputs a `--` separator argument between option (including
-	# option value) arguments and non-option arguments.
-	#
-	# At the frontend we need getopt to only parse options up to the point of
-	# a command. A command as far as getopt is concerned is simply a
-	# "non-option" argument. Using the above mentioned `POSIXLY_CORRECT`
-	# environment variable when parsing for the frontend, we can thus have
-	# getopt process options up to the first non-option, if given, which should
-	# be our command. We can then pass back any remaining arguments including
-	# the command argument, for a second command-stage handling. If no command
-	# is given, this is trivial to handle. If an invalid option is used before
-	# a command, this is caught by getopt.
-	#
-	# When a command is run, it is passed all remaining arguments, with most
-	# scripts then passing them to this function, with argument parsing then
-	# occurring in command-context, which just so happens to use almost the same
-	# set of arguments for most scripts (the config command is a notable
-	# exception).
-	#
-	# It is true that many of the common options have no effect in the frontend
-	# currently, but some do, such as colour control, and others could do in
-	# future or during development.
-	#
-	# Note, do not worry about options unavailable in frontend mode being
-	# handled in the case statement, they will never reach there if used for the
-	# frontend (i.e. before a command), they will result in an invalid option
-	# error!
-
-	local LONGOPTS="breakpoints,color,debug,help,no-color,quiet,usage,verbose,version"
-	local SHORTOPTS="huv"
-
-	local IS_FRONTEND="false"
-	if [ "${1}" = "frontend" ]; then
-		shift
-		IS_FRONTEND="true"
-	else
-		LONGOPTS="${LONGOPTS},force"
-	fi
-
-	local GETOPT_ARGS="--name=${PROGRAM} --shell sh --longoptions $LONGOPTS --options $SHORTOPTS"
-
 	local ARGUMENTS
 	local ERR=0
-	if [ "${IS_FRONTEND}" = "true" ]; then
-		ARGUMENTS="$(export POSIXLY_CORRECT=1; getopt $GETOPT_ARGS -- "${@}")" || ERR=$?
-	else
-		ARGUMENTS="$(getopt $GETOPT_ARGS -- "${@}")" || ERR=$?
-	fi
+	ARGUMENTS="$(getopt --longoptions breakpoints,color,debug,force,help,no-color,quiet,usage,verbose,version --name=${PROGRAM} --options huv --shell sh -- "${@}")" || ERR=$?
 
 	if [ $ERR -eq 1 ]; then
-		Echo_error "Invalid argument(s)"
+		Echo_error "invalid arguments"
 		exit 1
 	elif [ $ERR -ne 0 ]; then
 		Echo_error "getopt failure"
 		exit 1
 	fi
 
-	# Replace arguments with result of getopt processing (e.g. with non-options shuffled to end)
-	# Note that this only affects this function's parameter set, not the calling function's or
-	# calling script's argument set.
 	eval set -- "${ARGUMENTS}"
 
-	local ARG
-	for ARG in "$@"; do
-		case "${ARG}" in
+	while true
+	do
+		case "${1}" in
 			--breakpoints)
 				_BREAKPOINTS="true"
 				shift
@@ -119,16 +58,8 @@ Arguments ()
 				;;
 
 			-h|--help)
-				if [ $(which man) ]; then
-					if [ "${IS_FRONTEND}" = "true" ]; then
-						man ${PROGRAM}
-					else
-						man ${PROGRAM} $(basename ${0})
-					fi
-					exit 0
-				elif [ "${IS_FRONTEND}" = "true" ]; then
-					Usage --exit
-				fi
+				Man
+				shift
 				;;
 
 			--quiet)
@@ -157,17 +88,9 @@ Arguments ()
 				;;
 
 			*)
-				if [ "${IS_FRONTEND}" = "true" ]; then
-					# We have handled all frontend options up to what we assume to be a command
-					break
-				fi
-				Echo_error "Internal error, unhandled option: %s" "${ARG}"
+				Echo_error "internal error %s" "${0}"
 				exit 1
 				;;
 		esac
 	done
-
-	# Return remaining args
-	# Much more simple than trying to deal with command substitution.
-	REMAINING_ARGS="$@"
 }
diff --git a/functions/init.sh b/functions/init.sh
index c9927492e..1fbbd9308 100755
--- a/functions/init.sh
+++ b/functions/init.sh
@@ -25,14 +25,7 @@ Auto_build_config ()
 
 Init_config_data ()
 {
-	# Here we ignore the consumption of option arguments, we would have to return REMAINING_ARGS
-	# for use in a `set -- $REMAINING_ARGS` (or `eval set -- "$REMAINING_ARGS"`) if we wanted to
-	# remove them from the set of args for calling scripts to make use of, in which case we might
-	# as well just move use of the function out of here. Note that currently scripts taking args
-	# like `$_PASS` do so as the first arg to the script, thus then just ignore any following
-	# option args (and capture them before arg processing takes place).
 	Arguments "${@}"
-	unset REMAINING_ARGS
 
 	Read_conffiles $(Common_config_files)
 	Prepare_config
diff --git a/functions/man.sh b/functions/man.sh
new file mode 100755
index 000000000..06b51a7d4
--- /dev/null
+++ b/functions/man.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+## live-build(7) - System Build Scripts
+## Copyright (C) 2016-2020 The Debian Live team
+## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
+##
+## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
+## This is free software, and you are welcome to redistribute it
+## under certain conditions; see COPYING for details.
+
+
+Man ()
+{
+	if [ $(which man) ]
+	then
+		man ${PROGRAM} $(basename ${0})
+		exit 0
+	fi
+}