How to debug bundler cache (cache seems to be growing very large)

[Fryguy]

Our bundler cache seems to continually grow very large (right now it's at 8GB) and I'm trying to debug why.

Is there a way to manually download the cache file so I can see what's inside?

---

My gut is telling that it's because we use git-based gems, and it's probably not "cleaning" the old git histories, but I want to prove it first before opening a ticket

[MSP-Greg]

Is there a way to manually download the cache file so I can see what's inside?

I don't believe there is. The cache files are placed within vendor/bundle in the repo. You could add some Actions steps to log the contents...

Our bundler cache seems to continually grow very large (right now it's at 8GB)

Is that the total, or the size of a single cache? Note that bundle clean is run after bundle install

I don't recall where I saw the info, but I think GHA limits caches to a total of 10GB, it will then flush the older caches to stay within that limit. Not.sure.

[Fryguy]

That's the size of a single cache.

Note that bundle clean is run after bundle install

My current theory is that bundle clean doesn't clean up any old git repositories references, but I need to prove that first.

[Fryguy]

Here's a screenshot of the caches (not sure if this is publicly visible hence the screenshot)

I'd roughly expect closer to ~600MB which is what I see locally after doing a bundle clean --force, and you can see that value in some of the other caches.

[eregon]

I think you should be able to see caches and download them at https://github.com/owner/repo/actions/caches

[eregon]

Ah that doesn't allow to download it, unfortunate.
But you can add https://github.com/actions/upload-artifact or so to upload the vendor/bundle.

[Fryguy]

Oh that's an interesting approach. Is there a limit to the size of the uploaded artifact?

(Asking because I didn't see anything in https://github.com/actions/upload-artifact?tab=readme-ov-file#limitations, but I'd be surprised if there wasn't some limitation)