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scripts: add wrapper to update Postfix configuration safely (follow up) (#3503)

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Casper 2023-08-27 23:40:24 +02:00 committed by GitHub
parent f89cbac21c
commit 43a122fe18
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2 changed files with 16 additions and 11 deletions
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26
target/scripts/helpers/postfix.sh
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@ -92,39 +92,43 @@ function _vhost_ldap_support() {
# /etc/aliases is handled by `alias.sh` and uses `postalias` to update the Postfix alias database. No need for `postmap`.
# http://www.postfix.org/postalias.1.html
# Add an key with an value to Postfix's main configuration file
# Add a key with a value to Postfix's main configuration file
# or update an existing key. An already existing key can be updated
# by either appending to the existing value (default) or by prepending.
#
# @param ${1} = key name in Postfix's main configuration file
# @param ${2} = new value (appended or prepended)
# @param ${3} = "append" (default) or "prepend" [OPTIONAL]
# @param ${3} = action "append" (default) or "prepend" [OPTIONAL]
function _add_to_or_update_postfix_main() {
local KEY=${1:?Key name is required}
local NEW_VALUE=${2:?New value is required}
local ACTION=${3:-append}
local CURRENT_VALUE
# If entry does not exist, add it - otherwise update with ACTION:
if ! grep -q -E "^${KEY}" /etc/postfix/main.cf; then
# Get current value from /etc/postfix/main.cf
_adjust_mtime_for_postfix_maincf
CURRENT_VALUE=$(postconf -h "${KEY}" 2>/dev/null)
# If key does not exist or value is empty, add it - otherwise update with ACTION:
if [[ -z ${CURRENT_VALUE} ]]; then
postconf "${KEY} = ${NEW_VALUE}"
else
KEY=$(_escape_for_sed "${KEY}")
NEW_VALUE=$(_escape_for_sed "${NEW_VALUE}")
local SED_STRING
# If $NEW_VALUE is already present --> nothing to do, skip.
if [[ " ${CURRENT_VALUE} " == *" ${NEW_VALUE} "* ]]; then
return 0
fi
case "${ACTION}" in
('append')
SED_STRING="/${NEW_VALUE}/! s|^(${KEY} *=.*)|\1 ${NEW_VALUE}|g"
postconf "${KEY} = ${CURRENT_VALUE} ${NEW_VALUE}"
;;
('prepend')
SED_STRING="/${NEW_VALUE}/! s|^(${KEY}) *= *(.*)|\1 = ${NEW_VALUE} \2|g"
postconf "${KEY} = ${NEW_VALUE} ${CURRENT_VALUE}"
;;
(*)
_log 'error' "Action '${3}' in _add_to_or_update_postfix_main is unknown"
return 1
;;
esac
sed -i -E "${SED_STRING}" /etc/postfix/main.cf
fi
}

1
target/scripts/helpers/utils.sh
View file

@ -4,6 +4,7 @@ function _escape() {
echo "${1//./\\.}"
}
# TODO: Not in use currently. Maybe in the future: https://github.com/docker-mailserver/docker-mailserver/pull/3484/files#r1299410851
# Replaces a string so that it can be used inside
# `sed` safely.
#