docker-mailserver/target/scripts/helpers/change-detection.sh
2023-05-24 09:06:59 +02:00

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#!/bin/bash
# This helper supports the changedetector service. Used by:
# - check-for-changes.sh
# - test/test_helper/common.bash:wait_for_changes_to_be_detected_in_container()
# - test/test_helper.bats
# - start-mailserver.sh --> setup-stack.sh:_setup (to initialize the CHKSUM_FILE state)
# Global checksum file used to track when monitored files have changed in content:
# shellcheck disable=SC2034
CHKSUM_FILE=/tmp/docker-mailserver-config-chksum
# Once container startup scripts complete, take a snapshot of
# the config state via storing a list of files content hashes.
function _prepare_for_change_detection
{
_log 'debug' 'Setting up configuration checksum file'
_log 'trace' "Creating '${CHKSUM_FILE}'"
_monitored_files_checksums >"${CHKSUM_FILE}"
}
# Returns a list of changed files, each line is a value pair of:
# <SHA-512 content hash> <changed file path>
function _monitored_files_checksums
{
# If a wildcard path pattern (or an empty ENV) would yield an invalid path
# or no results, `shopt -s nullglob` prevents it from being added.
shopt -s nullglob
declare -a STAGING_FILES CHANGED_FILES
# Supported user provided configs:
local DMS_DIR=/tmp/docker-mailserver
if [[ -d ${DMS_DIR} ]]; then
STAGING_FILES+=(
"${DMS_DIR}/postfix-accounts.cf"
"${DMS_DIR}/postfix-virtual.cf"
"${DMS_DIR}/postfix-regexp.cf"
"${DMS_DIR}/postfix-aliases.cf"
"${DMS_DIR}/postfix-relaymap.cf"
"${DMS_DIR}/postfix-sasl-password.cf"
"${DMS_DIR}/dovecot-quotas.cf"
"${DMS_DIR}/dovecot-masters.cf"
)
fi
# SSL certs:
if [[ ${SSL_TYPE:-} == 'manual' ]]; then
# When using "manual" as the SSL type,
# the following variables may contain the certificate files
STAGING_FILES+=(
"${SSL_CERT_PATH:-}"
"${SSL_KEY_PATH:-}"
"${SSL_ALT_CERT_PATH:-}"
"${SSL_ALT_KEY_PATH:-}"
)
elif [[ ${SSL_TYPE:-} == 'letsencrypt' ]]; then
# React to any cert changes within the following LetsEncrypt locations:
STAGING_FILES+=(
/etc/letsencrypt/acme.json
/etc/letsencrypt/live/"${SSL_DOMAIN}"/*.pem
/etc/letsencrypt/live/"${HOSTNAME}"/*.pem
/etc/letsencrypt/live/"${DOMAINNAME}"/*.pem
)
fi
# If the file actually exists, add to CHANGED_FILES
# and generate a content hash entry:
for FILE in "${STAGING_FILES[@]}"
do
[[ -f "${FILE}" ]] && CHANGED_FILES+=("${FILE}")
done
if [[ -n ${CHANGED_FILES:-} ]]; then
sha512sum -- "${CHANGED_FILES[@]}"
fi
}