Use extension to check running in container

The runningInContainer check is now run through the extension.

Removed the old code that made the checks using JS.

packages/nodejs-ext/.changesets/runningincontainer-function-is-now-available-from-the-extension.md

@@ -3,5 +3,5 @@ bump: "patch"
 type: "add"
 ---
 
-RunningInContainer function is now available from the extension. It checks if the agent is running
-in a container.
+Implement the `RunningInContainer` function available in the extension. It is
+used to check if the agent is running in a container.

packages/nodejs/.changesets/extension-now-checks-running-in-container.md

@@ -0,0 +1,7 @@
+---
+bump: "patch"
+type: "change"
+---
+
+The extension is now responsible of determining if the process is running in a container. This check
+was previously made by the Node.js integration code.

packages/nodejs/src/diagnose.ts

@@ -86,10 +86,7 @@ export class DiagnoseTool {
       language_version: process.versions.node,
       heroku,
       root: process.getuid() === 0,
-      // @TODO: this is pretty much just a guess right now
-      // it assumes docker. no jails, lxc etc.
-      // we'll need to adjust this a little later
-      running_in_container: hasDockerEnv() || hasDockerCGroup() || heroku
+      running_in_container: this.#extension.runningInContainer()
     }
   }
 
@@ -327,24 +324,3 @@ function readFileOptions(path: string, bytesToRead: number) {
     }
   }
 }
-
-/**
- * the following lines are borrowed from https://github.com/sindresorhus/is-docker/
- * thanks sindre! <3
- */
-function hasDockerEnv(): boolean {
-  try {
-    fs.statSync("/.dockerenv")
-    return true
-  } catch (_) {
-    return false
-  }
-}
-
-function hasDockerCGroup(): boolean {
-  try {
-    return fs.readFileSync("/proc/self/cgroup", "utf8").includes("docker")
-  } catch (_) {
-    return false
-  }
-}

packages/nodejs/src/extension.ts

@@ -66,4 +66,11 @@ export class Extension {
       return {}
     }
   }
+
+  /**
+   * Determines if the app is running inside a container
+   */
+  public runningInContainer(): boolean {
+    return extension.runningInContainer()
+  }
 }