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Scheduler for laptops which aren't on 24/7
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README.md

scron

Scheduler for laptops which aren't on 24/7.

Install

Download scron v0.1.0 and place it in your $PATH. Configure cron to run it every two hours with:

$ crontab -e
0 */2 * * * scron

Usage

Configure jobs in $HOME/.scron. This example runs cmd arg1 arg2 at least once every 30 days.

30d cmd arg1 arg2

You can also specify lower bounds like day of week (Su, Mo, Tu, We, Th, Fr, Sa), day of month (23rd), or day of year (4/15):

Mo,Fr    cmd1
1st,23rd cmd2
4/15     cmd3

cmd1 will attempt to run on Monday and Friday. If your machine is off the entire day, it will run as soon as possible. Here's an example timeline:

  • Mo: machine is off, nothing happens
  • Tu: machine is on, cmd1 runs to make up for Monday
  • We: already ran, nothing happens
  • Th: already ran, nothing happens
  • Fr: machine is on, cmd1 runs

An exit status of 0 is considered a success. Anything else is considered a failure and scron will attempt to re-run it again in 2 hours.

$HOME/.scrondb keeps the timestamps of the last run commands.

$HOME/.scronlog has the stdout, timestamps, and exit status of last scheduled commands.

Development

Use make for common tasks:

make spec                    # to run all tests
make spec ARGS=path/to/spec  # to run a single test
make build                   # to create a release binary in the bin directory
make install                 # to copy release binary into system bin (uses $INSTALL_BIN)
make release                 # to build releases for darwin/linux (requires docker)
make clean                   # to remove build artifacts and bin directory
make run                     # to run locally
make run ARGS=-h             # to run with local arguments

License

Copyright 2020 Hugh Bien.

Released under BSD License, see LICENSE for details.

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