daggo

daggo

Trying dagger with Go and GHA.

This README will serve as a guide and check list for things I had to figure out on my own, missing documentation or things I had to search in discord.

Initializing dagger

[!WARNING] These steps are required as to not inject dagger's dependencies in the root go.mod file while dagger/dagger#8095 isn't merged. Once merged and released, a simple call to dagger init will work as intended. Target fixed version: v0.12.5

$ mkdir dagger
$ cd dagger
$ go mod init github.com/depado/daggo/dagger
$ cd ..
$ dagger init --sdk=go --source=dagger/

Migrating from Dockerfile

[!WARNING] As far as I understand, Dockerfile's ENTRYPOINT and CMD combo instructions don't really make sense in OCI. Use only WithEntrypoint([]string{binPath}) with all the expected arguments instead.

• Check if there isn't something missing here.

Thoughts & notes

[!WARNING]

Documentation

Dagger seems to have fundamentaly changed in the past few months (stopped using the CUE language for instance), which mean most online resources (tutorials, articles, and even some on dagger's website/blog) are outdated.

[!WARNING]

Cache

Dagger pushes its caching capabilities as a way to greatly speed up build times and indeed, locally it works great. But once you want to use your own CI, things get messy because the only way (for now) to use dagger's caching ability is to use Dagger Cloud's paid plan to benefit from their experimental distributed cache. The community is actively trying to figure out how to achieve this on GitHub and Discord: dagger/dagger#6911.

That being said, initiatives are in progress to enable caching to work with other distributed cache providers: dagger/dagger#8004.

It has also been suggested to take a look at buildkit-cache-dance to cache buildx caches with GHA.