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#!/bin/bash
# Dynamically modifies openssl config file
# ./inimodify.sh [header] [variable] [value] < openssl.cnf
# ./inimodify.sh "usr_cert" "extendedKeyUsage" "clientAuth, serverAuth" < openssl.cnf
#requires bash 4.0 regexes
set -x
set -e
[ -n "$1" ] && HEADER="$1" || exit 2
[ -n "$2" ] && VARIABLE="$2" || exit 3
[ -n "$3" ] && VALUE="$3" || exit 4
IFS=$'\n'
HEADER_STANZA=0
VARIABLE_MODIFIED=0
while read line; do
if [[ "$line" =~ ^\ *\[\ *"$HEADER"\ *\] ]]; then
HEADER_STANZA=1
echo "$line"
elif [ "$HEADER_STANZA" == 1 ] && [[ "$line" =~ ^\ *"$VARIABLE"\ *= ]]; then
echo -n "$line"
echo ", $VALUE"
VARIABLE_MODIFIED=1
elif [ "$HEADER_STANZA" == 1 ] && [[ "$line" =~ ^\ *\[\ .+\ \] ]]; then
if [ "$VARIABLE_MODIFIED" == 0 ]; then
echo "$VARIABLE = $VALUE"
echo
VARIABLE_MODIFIED=1
fi
HEADER_STANZA=0
echo "$line"
else
echo "$line"
fi
done
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