Offline Mode For Stack

[sanya...@gmail.com]

Hello!

I am extremely interested int the Project-"Offline Mode for Stack" for Google Summer Of Code. 

I have gone through the previous attempts on the same topic on github.

 Please guide me further as to what should I do next as I am a little confused about how to break down the problem into pieces and base my proposal on.

Soliciting a prompt and positive response.

Thanking you

Sanya

 

[Emanuel Borsboom]

Here are my thoughts on the steps involved:

- Go through all code that does Internet access, make sure it can be disabled

- Add a way to download all required files (snapshots, package source, etc.) into an offline archive

- Ensure the offline archive can be incrementally updated (e.g. if a snapshot or extra-dep is updated, the new files can be added to the existing archive)

- Ensure the offline archive can also be used from an HTTP(S) server on a corporate intranet (note that actually uploading the archive to that server is out of scope since there are too many variables in how these servers could be set up)

- Add an easy way to reference the offline archive in stack.yaml.

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[bktso...@gmail.com]

Thanks for sharing your thoughts Emanuel, I have also interested with this and would like to work on it.

[Jan von Löwenstein]

Isn't the "offline archive" pretty much what can be done via extensible snapshots? What would be in such an archive that would not be in a snapshot. 

To view this discussion on the web visit https://groups.google.com/d/msgid/haskell-stack/0A7500A4-8222-4787-BD3A-039355BC374A%40fpcomplete.com.

[IC Rainbow]

It may be. But that requires tooling support nevertheless.

"Done" here means (for me) you run `stack offline-snapshot` and get a directory or tarball that you can distribute to developers, add to containers etc.

To view this discussion on the web visit https://groups.google.com/d/msgid/haskell-stack/CAJtP4w6UixPMtu1SDj7Bmf5hv1C9aVt2W3YGkAH-696tioxikw%40mail.gmail.com.

[Jan von Löwenstein]

Sure. I was asking because I opened https://github.com/commercialhaskell/stack/issues/3813 to implement dependency vendoring for Stack projects. 

Not sure if and when I would get to PR that myself, so I wouldn't mind if the topic gets picked up as GSoC project. Would be great if the use cases in above issue would be supported. 

I have a partially working PoC for the scenario, implemented outside of stack (using turtle, shelling out to stack) to verify such a snapshot would fulfill the scenarios. It's not on github yet but I could put it there for reference. 

Best

Jan