Support installing extensions

Author: DanielleMaywood

src/code-server/devcontainer-feature.json

@@ -15,6 +15,10 @@
         "args": {
             "type": "string",
             "default": ""
+        },
+        "extensions": {
+            "type": "string",
+            "default": ""
         }
     },
     "entrypoint": "/usr/local/bin/code-server-entrypoint",

src/code-server/install.sh

@@ -1,11 +1,19 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -e
 
 curl -fsSL https://code-server.dev/install.sh | sh
 
+IFS=',' read -ra extensions <<<"$EXTENSIONS"
+declare -p extensions
+
+for extension in "${extensions[@]}"
+do
+    code-server --install-extension "$extension"
+done
+
 cat > /usr/local/bin/code-server-entrypoint \
 << EOF
-#!/bin/sh
+#!/usr/bin/env bash
 set -e
 
 code-server --bind-addr "$HOST:$PORT" \$ARGS

test/code-server/code-server-extensions.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -e
+
+# Optional: Import test library bundled with the devcontainer CLI
+source dev-container-features-test-lib
+
+# Feature-specific tests
+check "code-server version" code-server --version
+check "code-server running" pgrep -f 'code-server/lib/node.*/code-server'
+check "code-server listening" sudo lsof -i "@0.0.0.0:8080"
+
+extensions=$(sudo code-server --list-extensions)
+
+check "code-server extensions [rust-lang.rust-analyzer]" grep 'rust-lang.rust-analyzer' <<<"$extensions"
+check "code-server extensions [ms-python.python]"        grep 'ms-python.python'        <<<"$extensions"
+
+# Report results
+reportResults

test/code-server/scenarios.json

@@ -14,5 +14,13 @@
                 "host": "0.0.0.0"
             }
         }
+    },
+    "code-server-extensions": {
+        "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+        "features": {
+            "code-server": {
+                "extensions": ["rust-lang.rust-analyzer", "ms-python.python"]
+            }
+        }
     }
 }