mirror of
https://github.com/the-djmaze/snappymail.git
synced 2024-09-20 15:45:55 +08:00
114 lines
3.1 KiB
Bash
114 lines
3.1 KiB
Bash
#!/bin/bash
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# ----------------------------------------------------------------------
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# Simple script to invoke logrotate at regular intervals
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# ----------------------------------------------------------------------
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# from https://github.com/misho-kr/docker-appliances/blob/master/nginx-nodejs/logrotate-loop.sh
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LOGROTATE_BIN="logrotate"
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STATE="$HOME/logrotate.state"
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CONF="/etc/logrotate.d/snappymail"
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export LOGROTATE_BIN STATE CONF
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RUN_INTERVAL="3600" # every hour
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# helper functions for logging
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export FMT="%a %b %d %Y %H:%M:%S GMT%z (%Z)"
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function log_date() {
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echo "$(date +"$FMT"): $*"
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}
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# ----------------------------------------------------------------------
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# Main loop of the logrotate service:
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#
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# while True:
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# sleep N seconds
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# run logrotate
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#
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# ----------------------------------------------------------------------
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function logrotate_loop() {
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trap on_terminate TERM INT
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local interval="${1}"
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log_date "===================================================="
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log_date
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log_date "logrotate service starting (pid=$$)"
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log_date "logrotate process will run every ${interval} seconds"
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while true; do
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current_time=$(date "+%s")
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next_run_time=$(( current_time + interval ))
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while (( current_time < next_run_time ))
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do
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logrotate_sleep $(( next_run_time - current_time ))
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current_time=$(date "+%s")
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done
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logrotate_run
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done
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}
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# helper function to execute logrotate and pass it the right parameters
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function logrotate_run() {
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log_date "logrotate will run now"
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${LOGROTATE_BIN} -s ${STATE} ${CONF}
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}
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# ----------------------------------------------------------------------
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# Procedure to idle the execution for a number of seconds
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#
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# There are two requirements:
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#
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# - export the PID of the sleep command so that it can be terminated
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# in case the logrotate service is being shutdown
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# - keep this (bash) process responsive to SIGTERM while in sleep
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# mode (normally the signal will be masked and will not be delivered
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# until the subprocess completes)
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# ----------------------------------------------------------------------
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proc_sleep_pid=""
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function logrotate_sleep() {
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local sleep_interval=${1}
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log_date "logrotate will sleep for ${sleep_interval} seconds"
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( exec -a "logrotate: sleep" sleep ${sleep_interval} )&
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proc_sleep_pid=$!
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wait ${proc_sleep_pid}
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}
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# ----------------------------------------------------------------------
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# Signal handler for logrotate service to make sure the process exits:
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#
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# - properly by terminating the sleep process that is used to idle
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# the service
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# - gracefully by writing a message in the log
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# ----------------------------------------------------------------------
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function on_terminate() {
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log_date "logrotate will terminate"
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log_date
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kill -TERM ${proc_sleep_pid}
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exit 0
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}
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# ----------------------------------------------------------------------
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# main
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# ----------------------------------------------------------------------
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logrotate_loop ${1:-RUN_INTERVAL}
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