haskell - change devcontainer to use GHCup (#1478)

containers/haskell/.devcontainer/Dockerfile

@@ -1,25 +1,49 @@
-# Use the [Choice] comment to indicate option arguments that should appear in VS Code UX
-#
-# [Choice] Haskell version: 9, 8
-ARG VARIANT=8
-FROM haskell:${VARIANT}
+FROM debian:bullseye-slim
+
+ENV LANG C.UTF-8
 
-# Use the [Option] comment to specify true/false arguments that should appear in VS Code UX
-#
 # [Option] Install zsh
 ARG INSTALL_ZSH="true"
 # [Option] Upgrade OS packages to their latest versions
 ARG UPGRADE_PACKAGES="false"
 
-# Install needed packages and setup non-root user. Use a separate RUN statement to add your own dependencies
+# Install needed packages and setup non-root user.
+# Use a separate RUN statement to add your own dependencies
 ARG USERNAME=vscode
 ARG USER_UID=1000
 ARG USER_GID=$USER_UID
 COPY library-scripts/*.sh /tmp/library-scripts/
-RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+RUN apt-get update \
+    && export DEBIAN_FRONTEND=noninteractive \
     && /bin/bash /tmp/library-scripts/common-debian.sh "${INSTALL_ZSH}" "${USERNAME}" "${USER_UID}" "${USER_GID}" "${UPGRADE_PACKAGES}" "true" "true"\
-    && apt-get autoremove -y && apt-get clean -y && rm -rf /var/lib/apt/lists/* /tmp/library-scripts
+    && rm -rf /tmp/library-scripts \
+    && apt-get install -y --no-install-recommends \
+        dpkg-dev \
+        gcc \
+        libc6-dev \
+        libffi-dev \
+        libgmp-dev \
+        libnuma-dev \
+        libtinfo-dev \
+        zlib1g-dev \
+    && apt-get autoremove -y && apt-get clean -y && rm -rf /var/lib/apt/lists/*
+
+# Install latest GHCup in the non-root user home
+USER $USERNAME
+
+RUN mkdir -p "$HOME/.ghcup/bin" \
+    && curl -LJ "https://downloads.haskell.org/~ghcup/x86_64-linux-ghcup" -o "$HOME/.ghcup/bin/ghcup" \
+    && chmod +x "$HOME/.ghcup/bin/ghcup"
+ENV PATH="/home/$USERNAME/.cabal/bin:/home/$USERNAME/.ghcup/bin:$PATH"
+
+# [Choice] GHC version: recommended, latest, 9.2, 9.0, 8.10, 8.8, 8.6
+ARG GHC_VERSION="recommended"
 
-# [Optional] Uncomment this section to install additional OS packages.
-# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-#     && apt-get -y install --no-install-recommends <your-package-list-here>
+# Use GHCup to install versions of main utilities
+# If you prefer to let the Haskell extension install everything on demand,
+# comment out the lines below. In that case, you may need to manually run "cabal update""."
+RUN ghcup install ghc "${GHC_VERSION}" --set \
+    && ghcup install cabal recommended --set \
+    && ghcup install stack recommended --set \
+    && ghcup install hls recommended --set \
+    && cabal update

containers/haskell/.devcontainer/devcontainer.json

@@ -1,33 +1,26 @@
 {
   "name": "Haskell (Community)",
-
-  // Update the 'dockerfile' property if you aren't using the standard 'Dockerfile' filename.
   "build": {
-          "dockerfile": "Dockerfile",
-          "args": {
-            // Update 'VARIANT' to pick a Haskell version: 9, 8
-            "VARIANT": "8"
-          }
+    "dockerfile": "Dockerfile",
+    "args": {
+      // Update 'GHC_VERSION' to pick a GHC version: recommended, latest, 9.2, 9.0, 8.10, 8.8, 8.6
+      "GHC_VERSION": "recommended"
+    }
+  },
+  // Configure tool-specific properties.
+  "customizations": {
+    // Configure properties specific to VS Code.
+    "vscode": {
+      // Set *default* container specific settings.json values on container create.
+      "settings": {
+        "haskell.manageHLS": "GHCup"
+      },
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "haskell.haskell"
+      ]
+    }
   },
-
-	// Configure tool-specific properties.
-	"customizations": {
-		// Configure properties specific to VS Code.
-		"vscode": {
-			// Add the IDs of extensions you want installed when the container is created.
-			"extensions": [
-				"haskell.haskell"
-			]
-		}
-	},
-
-  // Use 'forwardPorts' to make a list of ports inside the container available locally.
-  // "forwardPorts": [],
-
-  // Use 'postCreateCommand' to run commands after the container is created.
-  // "postCreateCommand": "uname -a",
-
-
   // Comment out to connect as root instead. To add a non-root user, see: https://aka.ms/vscode-remote/containers/non-root.
   "remoteUser": "vscode"
 }

containers/haskell/README.md

@@ -9,7 +9,7 @@ _This definition will hopefully get you going quickly with Haskell running as a
 
 | Metadata                    | Value                                                                        |
 |---------------------------- | -----------------------------------------------------------------------------|
-| *Contributors*              | [Stuart Pike](https://github.com/stuartpike), [Javier Neira](https://github.com/jneira), [eitsupi](https://github.com/eitsupi) |
+| *Contributors*              | [Stuart Pike](https://github.com/stuartpike), [Javier Neira](https://github.com/jneira), [eitsupi](https://github.com/eitsupi), [gusbicalho](https://github.com/gusbicalho) |
 | *Categories*                | Community, Haskell |
 | *Definition type*           | Dockerfile |
 | *Works in Codespaces*       | Yes |
@@ -20,13 +20,15 @@ _This definition will hopefully get you going quickly with Haskell running as a
 
 ## Using this definition
 
-While the definition itself works unmodified, you can select the version of Haskell the container uses by updating the `VARIANT` arg in the included `.devcontainer/devcontainer.json` file.
+This definition builds a container with the latest version of [GHCup](https://www.haskell.org/ghcup/). GHCup is then used to install the **recommended** (as defined by GHCup) version of GHC, cabal and stack.
+
+You can choose a different GHC version to start with by setting the GHC_VERSION option in `.devcontainer/devcontainer.json`. Alternatively, you can use the `ghcup` command in a running container to manage GHC versions.
 
 ```json
 "build": {
     "dockerfile": "Dockerfile",
     "args": {
-        "VARIANT": "9"
+        "GHC_VERSION": "9.2"
     }
 }
 ```