mirror of
https://github.com/docker-mailserver/docker-mailserver.git
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115 lines
4.5 KiB
Bash
115 lines
4.5 KiB
Bash
#!/bin/bash
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# Docs - Config:
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# https://www.fetchmail.info/fetchmail-man.html#the-run-control-file
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# Docs - CLI:
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# https://www.fetchmail.info/fetchmail-man.html#general-operation
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# https://www.fetchmail.info/fetchmail-man.html#daemon-mode
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function _setup_fetchmail() {
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if [[ ${ENABLE_FETCHMAIL} -eq 1 ]]; then
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_log 'trace' 'Enabling and configuring Fetchmail'
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local CONFIGURATION FETCHMAILRC
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CONFIGURATION='/tmp/docker-mailserver/fetchmail.cf'
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FETCHMAILRC='/etc/fetchmailrc'
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# Create `/etc/fetchmailrc` with default global config, optionally appending user-provided config:
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if [[ -f ${CONFIGURATION} ]]; then
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cat /etc/fetchmailrc_general "${CONFIGURATION}" >"${FETCHMAILRC}"
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else
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cat /etc/fetchmailrc_general >"${FETCHMAILRC}"
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fi
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chmod 700 "${FETCHMAILRC}"
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chown fetchmail:root "${FETCHMAILRC}"
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else
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_log 'debug' 'Fetchmail is disabled'
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fi
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}
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# NOTE: This feature is only actually relevant for entries polling via IMAP (to support leveraging the "IMAP IDLE" extension):
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# - With either the `--idle` CLI or `idle` config option present
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# - With a constraint on one fetchmail instance per server polled (and only for a single mailbox folder to monitor from that poll entry)
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# - Reference: https://otremba.net/wiki/Fetchmail_(Debian)#Immediate_Download_via_IMAP_IDLE
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function _setup_fetchmail_parallel() {
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if [[ ${FETCHMAIL_PARALLEL} -eq 1 ]]; then
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_log 'trace' 'Enabling and configuring Fetchmail parallel'
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mkdir /etc/fetchmailrc.d/
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# Extract the content of `/etc/fetchmailrc` into:
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# - Individual `/etc/fetchmailrc.d/fetchmail-*.rc` files, one per server (`poll` entries)
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# - Global config options temporarily to `/etc/fetchmailrc.d/defaults`, which is prepended to each `fetchmail-*.rc` file
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function _fetchmailrc_split() {
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local FETCHMAILRC='/etc/fetchmailrc'
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local FETCHMAILRCD='/etc/fetchmailrc.d'
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local DEFAULT_FILE="${FETCHMAILRCD}/defaults"
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if [[ ! -r ${FETCHMAILRC} ]]; then
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_log 'warn' "File '${FETCHMAILRC}' not found"
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return 1
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fi
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if [[ ! -d ${FETCHMAILRCD} ]]; then
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if ! mkdir "${FETCHMAILRCD}"; then
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_log 'warn' "Unable to create folder '${FETCHMAILRCD}'"
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return 1
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fi
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fi
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# Scan through the config:
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# 1. Extract the global fetchmail config lines (before any poll entry is configured).
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# 2. Once a poll entry line is found, create a new config with the global config and append the poll entry config.
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# 3. Repeat step 2 when another poll entry is found, until reaching the end of `/etc/fetchmailrc`.
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local COUNTER=0 SERVER=0
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while read -r LINE; do
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if [[ ${LINE} =~ poll ]]; then
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# Signal that global config has been captured (only remaining poll entry configs needs to be parsed):
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SERVER=1
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# Create a new fetchmail config for this poll entry:
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COUNTER=$(( COUNTER + 1 ))
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cat "${DEFAULT_FILE}" >"${FETCHMAILRCD}/fetchmail-${COUNTER}.rc"
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echo "${LINE}" >>"${FETCHMAILRCD}/fetchmail-${COUNTER}.rc"
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elif [[ ${SERVER} -eq 0 ]]; then
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# Until the first poll entry is encountered, all lines are captured as global config:
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echo "${LINE}" >>"${DEFAULT_FILE}"
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else
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# Otherwise until a new poll entry is encountered, all lines are captured for the current poll config:
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echo "${LINE}" >>"${FETCHMAILRCD}/fetchmail-${COUNTER}.rc"
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fi
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done < <(_get_valid_lines_from_file "${FETCHMAILRC}")
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rm "${DEFAULT_FILE}"
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}
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_fetchmailrc_split
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# Create supervisord service files for each instance:
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# `--idfile` is intended for supporting POP3 with UIDL cache (requires either `--uidl` for CLI, or `uidl` setting in config)
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local COUNTER=0
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for RC in /etc/fetchmailrc.d/fetchmail-*.rc; do
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COUNTER=$(( COUNTER + 1 ))
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cat >"/etc/supervisor/conf.d/fetchmail-${COUNTER}.conf" << EOF
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[program:fetchmail-${COUNTER}]
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startsecs=0
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autostart=false
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autorestart=true
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stdout_logfile=/var/log/supervisor/%(program_name)s.log
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stderr_logfile=/var/log/supervisor/%(program_name)s.log
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user=fetchmail
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command=/usr/bin/fetchmail --fetchmailrc ${RC} --verbose --nodetach --daemon %(ENV_FETCHMAIL_POLL)s --idfile /var/lib/fetchmail/.fetchmail-UIDL-cache --pidfile /var/run/fetchmail/%(program_name)s.pid
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EOF
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chmod 700 "${RC}"
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chown fetchmail:root "${RC}"
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done
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supervisorctl reread
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supervisorctl update
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else
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_log 'debug' 'Fetchmail parallel is disabled'
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fi
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}
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