'skaffold debug' should support build triggers

[bmcustodio]

skaffold debug is awesome, but as far as I understand it doesn't support "redeploy-on-change"—meaning that to debug a change one has to stop and restart skaffold debug, which may be a bit awkward. It would be great if skaffold debug would behave a bit more like skaffold dev. Thoughts?

[bmcustodio]

BTW, I am not sure whether this is this a duplicate of #2351 or not—sorry if it is indeed.

[balopat]

Hi @bmcstdio - thanks for opening this!

Yes, this was intentional from the get-go because we didn't have a clean separation between file sync and debug, and the whole filewatcher is turned off for debug:
https://github.com/GoogleContainerTools/skaffold/blob/master/cmd/skaffold/app/cmd/debug.go#L39
@briandealwis can share a bit more about the plans, but I think this should be possible.

[briandealwis]

Hi @bmcstdio. debug disables the file watcher because it's really awkward have a process call stack in the debugger be torn down because you saved a change (triggering a rebuild and redeploy, causing the container and process being killed).

debug should use the newer mechanisms to disable the auto build so that it can be overridden or triggered externally though. I'll repurpose this bug for that.

[tstromberg]

@briandealwis - are you aware of any progress on this?

[briandealwis]

Yeah, I have to write a test. In progress.