Is it possible to see the next scheduled build for a job? (ie, when using the "H" / hash crontab option)

[Paul Molodowitch]

I'm a big fan of using the hash in scheduled builds - ie,

H H * * *

to run a job once a day.

The only downside is that it can be hard to know when a job will next build - is there any way to see that information?

Thanks,

 Paul

[Daniel Beck]

I don't think it's exposed anywhere on the UI (except indirectly, e.g. dates in polling logs and when previous builds were started).

However, you can access it via the Jenkins script console, if you're willing to work for the information.

Run the following script, replacing 'job-name' with the name of the job you're interested in:
---
Jenkins.instance.getItemByFullName('job-name').triggers.each { desc, trig ->
println desc.class.name
trig.tabs.tabs.each { it.bits.each { b -> println Long.toBinaryString(b) } }
println ""
}
return
---

This will print something like the following:
---
hudson.triggers.TimerTrigger$DescriptorImpl
1000000000000001000000000000001000000000000001
1000000000000000
1000000000000000
1111111111110

hudson.triggers.SCMTrigger$DescriptorImpl
1000000000000000000000000000000
10000000000
11111111111111111111111111111110
11111110000
---

One block per configured trigger, in this case one 'Build periodically' (TimerTrigger) and one 'Poll SCM' (SCMTrigger). The binary lines correspond to minutes, hours, day-of-month and month respectively. The bits which are set indicate when the trigger is set to trigger. The rightmost bit always represents '0' (which cannot be set for day-of-month and month). Day-of-week is special and missing here, left as an exercise to the reader.

In the first example, I used the cron expression 'H/15 H(12-18) 15 * *'. It is set to trigger on 15:(0,15,30,45) on the 15th of every month.

In the second example, I used the expression 'H 10 * 4-10 *'. H is effectively 31, polling SCM every day from April to October on 10:31.

This uses private members etc. and might break in future versions in Jenkins. Should be safe from breaking Jenkins though.

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[Paul Molodowitch]

Hmm... I was hoping for something in the UI itself... but thanks for the info, if I'm ever feeling not-lazy (hah!), or actually NEED to know, it will come in handy!

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