Add linkup command to improve link functionality

src/node/link.ts

@@ -0,0 +1,22 @@
+import { logger } from "@coder/logger"
+import { spawn } from "child_process"
+import path from "path"
+
+export function startLink(port: number): Promise<void> {
+  logger.debug(`running link targetting ${port}`)
+
+  const agent = spawn(path.resolve(__dirname, "../../lib/linkup"), ["--devurl", `code:${port}:code-server`], {
+    shell: false,
+  })
+  return new Promise((res, rej) => {
+    agent.on("error", rej)
+    agent.on("close", (code) => {
+      if (code !== 0) {
+        return rej({
+          message: `Link exited with ${code}`,
+        })
+      }
+      res()
+    })
+  })
+}

src/node/main.ts

@@ -8,6 +8,7 @@ import { createApp, ensureAddress } from "./app"
 import { AuthType, DefaultedArgs, Feature } from "./cli"
 import { coderCloudBind } from "./coder_cloud"
 import { commit, version } from "./constants"
+import { startLink } from "./link"
 import { register } from "./routes"
 import { humanPath, isFile, open } from "./util"
 
@@ -129,6 +130,15 @@ export const runCodeServer = async (args: DefaultedArgs): Promise<http.Server> =
     logger.info("  - Connected to cloud agent")
   }
 
+  try {
+    const port = parseInt(serverAddress.split(":").pop() as string, 10)
+    startLink(port).catch((ex) => {
+      logger.debug("Link daemon exited!", field("error", ex))
+    })
+  } catch (ex) {
+    logger.debug("Failed to start link daemon!", ex)
+  }
+
   if (args.enable && args.enable.length > 0) {
     logger.info("Enabling the following experimental features:")
     args.enable.forEach((feature) => {