fix(firefox-android): Support abstract sockets for RDB (#1391)

New versions of firefox-android (>= 63) appear to use abstract unix sockets instead of filesystem sockets for the debugging connection. 

This change ensures support for both the original filesystem namespace and also the abstract namespace.

Author: Andrew Miller

src/extension-runners/firefox-android.js

@@ -578,9 +578,13 @@ export class FirefoxAndroidExtensionRunner {
     // to connect the Firefox DevTools to the Firefox for Android instance).
     log.info(`You can connect to this Android device on TCP port ${tcpPort}`);
 
+    const forwardSocketSpec = this.selectedRDPSocketFile.startsWith('@') ?
+      `localabstract:${this.selectedRDPSocketFile.substr(1)}`
+      : `localfilesystem:${this.selectedRDPSocketFile}`;
+
     await adbUtils.setupForward(
       selectedAdbDevice,
-      `localfilesystem:${this.selectedRDPSocketFile}`,
+      forwardSocketSpec,
       `tcp:${tcpPort}`
     );
 

tests/unit/test-extension-runners/test.firefox-android.js

@@ -43,6 +43,10 @@ const fakeRDPUnixSocketFile = (
   '/data/data/org.mozilla.firefox/firefox-debugger-socket'
 );
 
+const fakeRDPUnixAbstractSocketFile = (
+  '@org.mozilla.firefox/firefox-debugger-socket'
+);
+
 type PrepareParams = {
   params?: Object,
   debuggerPort?: number,
@@ -101,7 +105,8 @@ function prepareExtensionRunnerParams({
   };
 }
 
-function prepareSelectedDeviceAndAPKParams(overriddenProperties = {}) {
+function prepareSelectedDeviceAndAPKParams(
+  overriddenProperties = {}, adbOverrides = {}) {
   const fakeADBUtils = {
     discoverDevices: sinon.spy(() => Promise.resolve([
       'emulator-1', 'emulator-2',
@@ -124,6 +129,7 @@ function prepareSelectedDeviceAndAPKParams(overriddenProperties = {}) {
     clearArtifactsDir: sinon.spy(() => Promise.resolve()),
     setUserAbortDiscovery: sinon.spy(() => {}),
     ensureRequiredAPKRuntimePermissions: sinon.spy(() => Promise.resolve()),
+    ...adbOverrides,
   };
 
   const {params} = prepareExtensionRunnerParams({
@@ -397,6 +403,36 @@ describe('util/extension-runners/firefox-android', () => {
          );
        });
 
+    it('discovers the RDP abstract unix socket and forward it on',
+       async () => {
+         const {
+           params, fakeADBUtils,
+         } = prepareSelectedDeviceAndAPKParams({}, {
+           discoverRDPUnixSocket: sinon.spy(
+             () => Promise.resolve(fakeRDPUnixAbstractSocketFile)
+           )});
+
+         const runnerInstance = new FirefoxAndroidExtensionRunner(params);
+         await runnerInstance.run();
+
+         sinon.assert.calledWithMatch(
+           fakeADBUtils.discoverRDPUnixSocket,
+           'emulator-1', 'org.mozilla.firefox'
+         );
+
+         sinon.assert.calledWithMatch(
+           fakeADBUtils.setupForward,
+           'emulator-1',
+           'localabstract:org.mozilla.firefox/firefox-debugger-socket',
+           `tcp:${runnerInstance.selectedTCPPort}`,
+         );
+
+         sinon.assert.callOrder(
+           fakeADBUtils.discoverRDPUnixSocket,
+           fakeADBUtils.setupForward
+         );
+       });
+
     it('installs the build extension as a temporarily installed addon',
        async () => {
          const {