ninedocker/misc/images/mta/containers/set-exim4-update-conf

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#!/usr/bin/env bash
set -Eeuo pipefail
conf='/etc/exim4/update-exim4.conf.conf'
args=()
while [ "$#" -gt 0 ]; do
key="$1"
value="$2"
shift 2
if ! grep -qE "^#?${key}=" "$conf"; then
echo >&2 "error: '$key' not found in '$conf'"
exit 1
fi
sed_escaped_value="$(sed -e 's/[\/&]/\\&/g' <<<"$value")"
args+=( -e "s/^#?(${key})=.*/\1='${sed_escaped_value}'/" )
done
if [ "${#args[@]}" -eq 0 ]; then
echo >&2 "error: nothing to do?"
exit 1
fi
set -x
sed -ri "${args[@]}" "$conf"
update-exim4.conf -v