Devcontainer setup for HLS

Author: Porges

.devcontainer/Dockerfile

@@ -5,6 +5,19 @@ ARG VARIANT="focal"
 FROM mcr.microsoft.com/vscode/devcontainers/base:0-${VARIANT}
 
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-    && apt-get -y install --no-install-recommends gcc libc6-dev libffi-dev libgmp-dev make xz-utils zlib1g-dev libtinfo-dev
+    && apt-get -y install --no-install-recommends \
+    build-essential curl libffi-dev libffi7 libgmp-dev libgmp10 libncurses-dev libncurses5 libtinfo5 \
+    gcc libc6-dev make xz-utils zlib1g-dev libtinfo-dev
 
-RUN curl -sSL https://get.haskellstack.org/ | sh
+USER vscode
+
+RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | \
+    BOOTSTRAP_HASKELL_MINIMAL=1 \
+    BOOTSTRAP_HASKELL_NONINTERACTIVE=1 \
+    BOOTSTRAP_HASKELL_VERBOSE=1 \
+    BOOTSTRAP_HASKELL_ADJUST_BASHRC=1 \
+    GHCUP_PROFILE_FILE=/home/vscode/.bashrc \
+    MY_SHELL=bash \
+    sh
+
+USER root

.devcontainer/devcontainer.json

@@ -8,20 +8,14 @@
 		"args": { "VARIANT": "focal" }
 	},
 
-	// Set *default* container specific settings.json values on container create.
 	"settings": {},
 
-	// 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": [],
+	"onCreateCommand": "ghcup install hls && ghcup install stack",
+	"updateContentCommand": "stack build --test --only-dependencies",
 
-	// Use 'postCreateCommand' to run commands after the container is created.
-	"postCreateCommand": "stack setup",
-
-	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "vscode"
 }

stack.yaml

@@ -3,4 +3,4 @@ extra-package-dbs: []
 packages:
 - '.'
 extra-deps: []
-resolver: lts-20.1
+resolver: lts-19.33 

stack.yaml.lock

@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    sha256: b73b2b116143aea728c70e65c3239188998bac5bc3be56465813dacd74215dc5
-    size: 648424
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/1.yaml
-  original: lts-20.1
+    sha256: 6d1532d40621957a25bad5195bfca7938e8a06d923c91bc52aa0f3c41181f2d4
+    size: 619204
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/33.yaml
+  original: lts-19.33