Feature Request: Anacron support to allow for the device to be powered off without missing scans. #164
Description
Is your feature request related to a problem? Please describe.
If the time window indicated by the crontab entry generated by clamtk is missed, it won't get hit until next time.
This can be a problem when the frequency is set really low.
User story:
- Install and configure clamTK on something like a laptop, configured to run weekly, on saturday at lunchtime.
- Ensure computer is off during that time
- Clamtk won't run till next week at that time (idealy)
Describe the solution you'd like
Anacron Is an alternative to cron that "[u]nlike cron(8), it does not assume that the machine is running continuously. Hence, it can be used on machines that aren't running 24 hours a day, to control regular jobs as daily, weekly, and monthly jobs.
Here's why I think this would fix the problem:
For each job, Anacron checks whether this job has been executed in the last n days, where n is the period specified for that job. If not, Anacron runs the job's shell command, after waiting for the number of minutes specified as the delay parameter.
Describe alternatives you've considered
A startup script for each init system (systemd, runit, s6, OpenRC and SysV). Could be a heavy lift.
Additional context
I am aware that camtk currently isn't maintained. I'm requesting this feature in hopes that the next steward of the codebase would be available to consider this feature request.
I think that whether cron or anacron is used should be a choice presented to the user.
A downside to this is that the anacron script will increase the number of scripts running while the system starts.