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urbanslug / wai-devel

A development server for wai applications.
MIT License
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Overdependence on its environment. #3

Closed urbanslug closed 9 years ago

urbanslug commented 9 years ago

wai-devel depends on the environment variable GHC_PACKAGE_PATH and having the system ghc version be the one the application depends on.

The temporary fix for this is running wai-devel via stack exec. That is: stack exec wai-devel

A longer way and not recommended of doing this for yesod applications is setting the GHC_PACKAGE_PATH to: export GHC_PACKAGE_PATH=~/.stack/snapshots/x86_64-linux/lts-2.22/7.8.4/pkgdb: because that's the package path a fresh yesod scaffold currently looks for. Then have your system ghc version be 7.8.4 which can be done via: PATH=$PATH:/home/urbanslug/.stack/programs/x86_64-linux/ghc-7.8.4/bin
Have that come before other GHC versions being added to path.

This means wai-devel is very brittle and breaks when small environment changes occur. Stack have a way of getting around this. I will look at how they (stack developers) have implemented it and close this issue when fixed.

urbanslug commented 9 years ago

@haBuu Hey, have a look. I believe I have fixes this. If you approve I will close this issue. Again I appreciate your taking time to test this.

haBuu commented 9 years ago

It works now without stack exec.

urbanslug commented 9 years ago

Awesome :smile: