Pipeline: Question: poll-based change detection for Git?

[evgf]

In a GitOps project, we are trying to implement the poll-based change detection of the Git Repo using Tekton. (We cannot fully rely on WebHooks since they offer no guaranteed delivery)
I scanned through the Tekton Pipeline / Trigger documentation but did not find any sample of this use case.
If this possible, without implementing our own status caching / change-detection?
If yes, could you point me to the right direction?

[vdemeester]

/kind question

[dlorenc]

One approach might be to use a cronjob to check the status of a git repo, and if it has changed trigger a build.

You can find some info here: https://github.com/tektoncd/triggers/tree/master/examples/cron

[evgf]

Thank you @dlorenc, what we miss is the change tracking logic like in ArgoCD or Jenkins.
Even with Triggers, I need to keep track of the commits already processed and not processed.
Do you know, if there is anything we can start with?

[bobcatfish]

I think it would make sense to have something like this! But I think it would make sense to add this feature to tektoncd/triggers instead - apologies for the delayed response @evgf but would you be open to creating an issue over there? :pray:

• @dibyom @wlynch

[bobcatfish]

I've opened https://github.com/tektoncd/triggers/issues/480 and am closing this for now.

[ngtuna]

Hi this issue hit me. Our system can't receive git webhook thus we need to rely on poll. Do you know the plan for poll-based support ? Any timeline/design made?