cron-outage

cron-outage

Given an outage window, figure out which cron jobs would have run in that time.

cron-outage --start 2022-01-03T05:30:00Z --end 2022-01-03T11:30:00Z \
    --not-before 2022-01-03T19:30:00Z cron-file

Use --start and --end to specify the outage period.

Use --not-before to specify jobs to weed out because they will be executed regardless because they will be done soon. Set it to an hour or 2 after for example and that should weed out ones that run every few minutes or hours since they will get run normally anyway.

There's no point in trying to reschedule a job with a schedule like * * * * * once things are back up.

Building

To build and install:

git clone https://github.com/colinnewell/cron-outage.git
cd cron-outage
make
sudo make install

Bugs

The cron file parser is very happy path, and not cognisant of all cron formats. It may get in an infinite loop with bad input.