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#! /usr/bin/env bash
# Flatten a multi-line PXELINUX config file ignoring comments/blank lines.
#
# The text that appears after the 'append' clause in PXELINUX config files
# must all be on a single line. There is no support even for line
# continuation. This makes managing complex configurations a pain.
#
# To help with this situation, this script will take a milti-line file (or
# stdin if none is specified) and write flattened, single line output into
# stdout ignoring #-comments and blank lines while at it.
#
# If you have prepared your PXELINUX config file so that the 'append' clause
# is the last line without a trailing newline (and without a trailing space),
# then you can do:
#
# pxeflatten pxeconfig >>pxelinux.cfg/default
#
# Options:
#
# -n
# Don't write trailing newline (useful for appending multiple configs).
#
usage="usage: $0 [-n] [<file>]"
owd="$(pwd)"
trap "{ cd '$owd'; exit 1; }" ERR
set -o errtrace # Trap in functions.
function info () { echo "$*" 1>&2; }
function error () { info "$*"; exit 1; }
nl=true
while [ "$#" -gt 0 ]; do
case "$1" in
-n)
nl=
shift
;;
-*)
error "unknown option: $1"
;;
--)
shift
break
;;
*)
break
;;
esac
done
if [ -z "$1" ]; then
input="-"
else
input="$1"
fi
l=
while read l || [ -n "$l" ]; do
echo -n " $l"
done < <(sed -e '/^\s*#/d;/^\s*$/d;s/\s\s*/ /g' "$input")
# Final newline.
#
if [ "$nl" ]; then
echo
fi
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