How to install/use a local version of package using Stack? - haskell

Question

The situation is, I am trying to install Netwire using Stack. However, there is a problem in the latest netwire 5.0.1, as reported by dhobbs: http://hub.darcs.net/ertes/netwire/issue/13
Since I don't know when the problem will ever be fixed, I downloaded the repo and made the change myself. However, I don't understand how to install such a locally patched version. stack install does not install that into ~/.stack. Does anyone have an idea?
Update
Now I am developing some other libraries using Stack. How do I make another project use that libraries? Hard coding a relative path looks incredibly ugly.

Answer 1

So you have a project where you want to use your locally patched Netwire version and in your project you have a stack.yml, as an example:
flags: {}
packages:
- '.'
extra-deps: {}
resolver: lts-3.7
You also have an dependency on netwire declared in your cabal file.
To use you patched Netwire in this project of yours you simply put the patched Netwire package in a subdirectory of your project, perhaps called netwire, and update your stack.yml as such:
flags: {}
packages:
- '.'
- netwire
extra-deps: {}
resolver: lts-3.7
Now stack build will build your project with the patched Netwire version.
You can also put the modified source online (if the license permits) and refer to the source using either a tarball URL
- https://example.com/netwire.tar.gz
or a git repository and commit reference:
- location:
git: git#example.com/netwire
commit: 6a86ee32e5b869a877151f74064572225e1a0398
(Check out the documentation for more info: https://docs.haskellstack.org/en/stable/yaml_configuration/#packages-and-extra-deps)