gogocron - one second crontab daemon

Cron daemon with crontab syntax, small interval and execution timeout for each task. Report bugs here 21h@blindage.org.

Features

• 1 second minimal interval
• 10 ms precision
• run command as other user
• batch of commands
• timeout for whole task
• your own ENV variables
• traditional crontab syntax
• SIGHUP process to reload config files

Install

You can find binary code in Releases tab or build code yourself.

Requires:

• root user privileges to run su command
• available su command in $PATH

Installation:

$ wget https://git.blindage.org/attachments/b02e74bf-b000-4a62-978e-97f91c7f2a64 -O gogocron.deb
$ dpkg -i gogocron.deb
$ systemctl enable gogocron
$ systemctl start gogocron

Build code yourself

This is a Go code. Install required libraries and build:

go get github.com/kr/pty
go get gopkg.in/yaml.v2
go build

Interval

Use traditional crontab syntax

runsecond // second
runminute // minute
runhour   // hour
rundom    // day of month
runmonth  // month
rundow    // day of week

Timeout

• 1s - one second
• 1m10s - one minute and 10 seconds

timeout: 3h12m4s

ENV variables

Syntax:

env:
  - TESTVAR="test variable"

Commands

Syntax:

commands: 
  - whoami
  - sleep 3
  - head -c 20 /dev/urandom |base64
  - ls
  - echo $TESTVAR

Logging of task

logtype can accept:

• info (default, logging only fact of run)
• full (log fact of run and stdout/stderr, useful for debugging)
• disabled (completely disable logs)

Sample config file

---
name: "Print base64 of 20 random symbols"
runsecond: "*/5"
timeout: 10s
user: vlad
env:
  - TESTVAR="test variable"
commands: 
  - whoami
  - sleep 3
  - head -c 20 /dev/urandom |base64
  - ls
  - echo $TESTVAR