Add something like `dokku git:sync --build-if-changes ...` flag

[kleutzinger]

Description of feature

Ask

As is, dokku git:sync --build always rebuilds an app. It could be nice to have another flag which only builds when the remote repo has new changes. Like --build-if-changes or something. This is mostly a nice-to have but it could make sense to me.

Workarounds

There's definitely a way to set this up myself by running something like dokku git:sync &> out.txt && **check out.txt somehow** || dokku git:sync --build but it's a bit long-winded.

Context

I have a cron job at /etc/cron.d/kevsync

59 10 * * * dokku dokku git:sync --build blog https://github.com/kleutzinger/lektor-blog.git

It rebuilds my static site https://kevbot.xyz/blog each night based on what's on the github repo. This is working fine, but it rebuilds each night regardless of upstream changes or not.

https://dokku.com/docs/deployment/methods/git/#initializing-an-app-repository-from-a-remote-repository

the relevant source code to git:sync is here-ish i believe.

https://github.com/dokku/dokku/blob/a77c27d088b76d7255e3a37586a00a2b1815611f/plugins/git/internal-functions#L211-L219

[josegonzalez]

The logic for this can be done as shown here.

Probably makes sense to exit 0 if there are no changes.

[josegonzalez]

Closing as there is a pull request open.

[josegonzalez]

As an aside, we have an official github action that can be used to autodeploy your github repositories.