Would `stack vendor-dependencies` be a valuable contribution to stack?

[Jan von Löwenstein]

Hi,

I have got two use cases where Haskell code will be compiled remotely and potentially without internet access. 

One being Bosh (https://bosh.io) releases and another Cloud Foundry (https://cloudfoundry.org) applications. 

I plan to solve the offline compilation capability by 1. providing a GHC out of band and `--system-ghc` and the new custom snapshot feature introduced with Stack 1.6 

Instead of creating a separate cli, say `hvendor`, I would prefer to put it into stack as an additional command. First and foremost I want to reuse the code for reading stack.yml files and calculating a projects dependencies (like e.g. `stack list-dependencies`). Especially since I want to calculate project dependencies with respect to a given snapshot (`stack vendor-dependencies lts-10.3`) while the projects stack.yml will reference the custom, vendored snapshot. 

What do you think of the idea in general and a potential contribution in particular? 

Is anybody else seeing more use cases for dependency vendoring? 

Should I open an issue for discussing this further?

Regards 

Jan

[Neil Mitchell]

Hi Jan,

What does vendor-dependencies do? Is the ultimate goal to use stack
offline? If so, https://github.com/ndmitchell/offline-stack might be
what you are looking for. Out the box Stack can be configured to work
with offline dependencies, but it's a pain. That site gives a precise
recipe for doing it, plus links to all the issues that stack has and
that fixing would be useful.

Thanks, Neil

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[Jan von Löwenstein]

Hi Neil,

The command would download all dependencies as source tarballs and create a custom snapshot pointing to all tarballs.

I want to build offline on a remote and rather ephemeral machine. E.g. Bosh starts up a vm for compliation on demand and tears it down right afterwards. That means putting a complete mirror there is just too much data to send over the wire again and again and again.
For cloudfoundry buildpacks it is similar.

Best
Jan

[Neil Mitchell]

Hi Jan,

That does indeed seem valuable - certainly it would simplify the offline story.

Thanks, Neil

On Fri, Jan 12, 2018 at 5:51 PM, Jan von Löwenstein

[Jan von Löwenstein]

Just opened https://github.com/commercialhaskell/stack/issues/3813 to discuss the feature and implementation.

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