Add linkup command to improve link functionality

ci/build/build-code-server.sh

@@ -15,20 +15,29 @@ main() {
     chmod +x out/node/entry.js
   fi
 
+  # for arch; we do not use OS from lib.sh and get our own.
+  # lib.sh normalizes macos to darwin - but cloud-agent's binaries do not
+  source ./ci/lib.sh
+  OS="$(uname | tr '[:upper:]' '[:lower:]')"
+
   if ! [ -f ./lib/coder-cloud-agent ]; then
     echo "Downloading the cloud agent..."
 
-    # for arch; we do not use OS from lib.sh and get our own.
-    # lib.sh normalizes macos to darwin - but cloud-agent's binaries do not
-    source ./ci/lib.sh
-    OS="$(uname | tr '[:upper:]' '[:lower:]')"
-
     set +e
     curl -fsSL "https://github.com/cdr/cloud-agent/releases/latest/download/cloud-agent-$OS-$ARCH" -o ./lib/coder-cloud-agent
     chmod +x ./lib/coder-cloud-agent
     set -e
   fi
 
+  if ! [ -f ./lib/linkup ]; then
+    echo "Downloading Link agent..."
+
+    set +e
+    curl -fsSL "https://storage.googleapis.com/coder-link-releases/latest/linkup-$OS-$ARCH" -o ./lib/linkup
+    chmod +x ./lib/linkup
+    set -e
+  fi
+
   yarn browserify out/browser/register.js -o out/browser/register.browserified.js
   yarn browserify out/browser/pages/login.js -o out/browser/pages/login.browserified.js
   yarn browserify out/browser/pages/vscode.js -o out/browser/pages/vscode.browserified.js

ci/build/build-release.sh

@@ -61,6 +61,7 @@ EOF
     rsync node_modules/ "$RELEASE_PATH/node_modules"
     mkdir -p "$RELEASE_PATH/lib"
     rsync ./lib/coder-cloud-agent "$RELEASE_PATH/lib"
+    rsync ./lib/linkup "$RELEASE_PATH/lib"
   fi
 }
 

ci/build/npm-postinstall.sh

@@ -63,6 +63,12 @@ main() {
     echo "Failed to download cloud agent; --link will not work"
   fi
 
+  if curl -fsSL "https://storage.googleapis.com/coder-link-releases/latest/linkup-$OS-$ARCH" -o ./lib/linkup; then
+    chmod +x ./lib/linkup
+  else
+    echo "Failed to download Link agent; the Link extension will not work"
+  fi
+
   if ! vscode_yarn; then
     echo "You may not have the required dependencies to build the native modules."
     echo "Please see https://github.com/cdr/code-server/blob/master/docs/npm.md"