[Bug]: Haskell: `globalPackages` option installs no libraries

[klezm]

Feature id and version

ghcr.io/devcontainers-contrib/features/haskell:2

Devcontainer base Image

mcr.microsoft.com/devcontainers/base:jammy

What happened?

Packages (e.g. hspec) passed to globalPackages are only installed as executables and not as libraries, which often is necessary. For them to be accessible as libraries the --lib flag is missing in the cabal install command here: https://github.com/devcontainers-contrib/features/blob/9a1d24b27b2d1ea8916ebe49c9ce674375dced27/src/haskell/install.sh#L89

For more info on cabal install --lib and the difference between libraries and executables see: https://github.com/haskell/cabal/issues/6481 and cabal.readthedocs.io [1], [2]

Maybe an additional option (e.g. globalLibraries) for this feature would be the best.

Relevant log output

No response

[klezm]

My workaround for the moment is to add the cabal install --lib at the onCreateCommand. This will move the time consuming build process to the image creation (which is favorable for prebuilding devcontainers). But, if the build of a package fails the onCreateCommand fails as well which renders the image useless! Another alternative is to use another feature bash-command.

{
    "name": "Ubuntu",
    "image": "mcr.microsoft.com/devcontainers/base:jammy",

    "features": {
        "ghcr.io/devcontainers-contrib/features/haskell:2": {
            "globalPackages": "hspec hspec-contrib"
        },
                // Alternative 1
        "ghcr.io/devcontainers-contrib/features/bash-command:1": {
            "command": "echo \\\"cabal install --lib hspec hspec-contrib\\\" | sudo -iu $_REMOTE_USER"
        }
    },
        // Or without using another feature, you can just install the libraries using onCreateCommand
        // Alternative 2
    "onCreateCommand": "cabal install --lib hlint hspec hspec-contrib"
}