mirror of
https://github.com/docker-mailserver/docker-mailserver.git
synced 2024-01-19 02:48:50 +00:00
ede2b2394a
* get rid of subshell + exec
The new way of executing `sha512sum` should work as well as the old way
but without the clutter and possible problems the usage of subshells +
exec incurs.
Moreover, there was a misconception about array expansion. Using `""`
around an expanding array (`${ARRAY[@]}`) is quite fine (and actually
the preffered way), not because it makes the expansion _one_ string
(this would be `${ARRAY[*]}`), but it makes sure when elements are
expanded, each element has `""` around them so to speak, i.e. there is
no re-splitting of these elements.
* removed old concerns in comments
* increase test and check for changes sleep duration
139 lines
4.7 KiB
Bash
Executable file
139 lines
4.7 KiB
Bash
Executable file
#! /bin/bash
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# TODO: Adapt for compatibility with LDAP
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# Only the cert renewal change detection may be relevant for LDAP?
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# shellcheck source=./helper-functions.sh
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. /usr/local/bin/helper-functions.sh
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function _log_date
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{
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date +"%Y-%m-%d %H:%M:%S"
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}
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LOG_DATE=$(_log_date)
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_notify 'task' "${LOG_DATE} Start check-for-changes script."
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# ? --------------------------------------------- Checks
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cd /tmp/docker-mailserver || exit 1
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# check postfix-accounts.cf exist else break
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if [[ ! -f postfix-accounts.cf ]]
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then
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_notify 'inf' "${LOG_DATE} postfix-accounts.cf is missing! This should not run! Exit!"
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exit 0
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fi
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# verify checksum file exists; must be prepared by start-mailserver.sh
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if [[ ! -f ${CHKSUM_FILE} ]]
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then
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_notify 'err' "${LOG_DATE} ${CHKSUM_FILE} is missing! Start script failed? Exit!"
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exit 0
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fi
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# ? --------------------------------------------- Actual script begins
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# determine postmaster address, duplicated from start-mailserver.sh
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# this script previously didn't work when POSTMASTER_ADDRESS was empty
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_obtain_hostname_and_domainname
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PM_ADDRESS="${POSTMASTER_ADDRESS:=postmaster@${DOMAINNAME}}"
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_notify 'inf' "${LOG_DATE} Using postmaster address ${PM_ADDRESS}"
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# Change detection delayed during startup to avoid conflicting writes
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sleep 10
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_notify 'inf' "$(_log_date) check-for-changes is ready"
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while true
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do
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# get chksum and check it, no need to lock config yet
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_monitored_files_checksums >"${CHKSUM_FILE}.new"
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cmp --silent -- "${CHKSUM_FILE}" "${CHKSUM_FILE}.new"
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# cmp return codes
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# 0 – files are identical
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# 1 – files differ
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# 2 – inaccessible or missing argument
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if [[ ${?} -eq 1 ]]
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then
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_notify 'inf' "$(_log_date) Change detected"
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create_lock # Shared config safety lock
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CHANGED=$(grep -Fxvf "${CHKSUM_FILE}" "${CHKSUM_FILE}.new" | sed 's/^[^ ]\+ //')
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# TODO Perform updates below conditionally too
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# Also note that changes are performed in place and are not atomic
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# We should fix that and write to temporary files, stop, swap and start
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# `acme.json` is only relevant to Traefik, and is where it stores the certificates it manages.
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# When a change is detected it's assumed to be a possible cert renewal that needs to be
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# extracted for `docker-mailserver` services to adjust to.
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if [[ ${CHANGED} =~ /etc/letsencrypt/acme.json ]]
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then
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_notify 'inf' "'/etc/letsencrypt/acme.json' has changed, extracting certs.."
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# This breaks early as we only need the first successful extraction.
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# For more details see the `SSL_TYPE=letsencrypt` case handling in `setup-stack.sh`.
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#
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# NOTE: HOSTNAME is set via `helper-functions.sh`, it is not the original system HOSTNAME ENV anymore.
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# TODO: SSL_DOMAIN is Traefik specific, it no longer seems relevant and should be considered for removal.
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FQDN_LIST=("${SSL_DOMAIN}" "${HOSTNAME}" "${DOMAINNAME}")
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for CERT_DOMAIN in "${FQDN_LIST[@]}"
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do
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_notify 'inf' "Attempting to extract for '${CERT_DOMAIN}'"
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if _extract_certs_from_acme "${CERT_DOMAIN}"
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then
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# Prevent an unnecessary change detection from the newly extracted cert files by updating their hashes in advance:
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CERT_DOMAIN=$(_strip_wildcard_prefix "${CERT_DOMAIN}")
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ACME_CERT_DIR="/etc/letsencrypt/live/${CERT_DOMAIN}"
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sed -i "\|${ACME_CERT_DIR}|d" "${CHKSUM_FILE}.new"
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sha512sum "${ACME_CERT_DIR}"/*.pem >> "${CHKSUM_FILE}.new"
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break
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fi
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done
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fi
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# If monitored certificate files in /etc/letsencrypt/live have changed and no `acme.json` is in use,
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# They presently have no special handling other than to trigger a change that will restart Postfix/Dovecot.
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# TODO: That should be all that's required, unless the cert file paths have also changed (Postfix/Dovecot configs then need to be updated).
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# regenerate postfix accounts
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[[ ${SMTP_ONLY} -ne 1 ]] && _create_accounts
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_rebuild_relayhost
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# regenerate postix aliases
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_create_aliases
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# regenerate /etc/postfix/vhost
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# NOTE: If later adding support for LDAP with change detection and this method is called,
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# be sure to mimic `setup-stack.sh:_setup_ldap` which appends to `/tmp/vhost.tmp`.
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_create_postfix_vhost
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if find /var/mail -maxdepth 3 -a \( \! -user 5000 -o \! -group 5000 \) | read -r
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then
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chown -R 5000:5000 /var/mail
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fi
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_notify 'inf' "Restarting services due to detected changes.."
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supervisorctl restart postfix
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# prevent restart of dovecot when smtp_only=1
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[[ ${SMTP_ONLY} -ne 1 ]] && supervisorctl restart dovecot
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remove_lock
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_notify 'inf' "$(_log_date) Completed handling of detected change"
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fi
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# mark changes as applied
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mv "${CHKSUM_FILE}.new" "${CHKSUM_FILE}"
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sleep 2
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done
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exit 0
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