Fixes to get the Docker image building again

Firstly Firefox 60 now throws an error if its run as root inside a
user's home path. Which is great because that revelead my naivety about
using `RUN su user` in the Dockerfile. So now Firefox is running as a
non-root user inside Docker which is what was always best.

Also it turns out that the crude 3 second wait at startup hoping that
Firefox's Marionette had started listening, wasn't good enough. So now
we're actually listening for a log message to know when it's started
now.

Finally make all startup methods use a the post-webext connection state
to send the startup URL to the browser, the other methods just seemed to
flakey.

Includes version bump to 1.0.9

Dockerfile

@@ -1,26 +1,26 @@
 FROM bitnami/minideb:stretch
 
-RUN install_packages xvfb libgtk-3-0 curl ca-certificates bzip2 libdbus-glib-1-2
+RUN install_packages xvfb libgtk-3-0 curl ca-certificates bzip2 libdbus-glib-1-2 procps
 
 # Logging client for Google's Stackdriver logging service.
 # NB Not used by default. Only used by the Browsh as a Service platform on the
 #    anonymous accounts.
 RUN curl -L -o /usr/local/bin/gcloud_logger https://github.com/tombh/gcloud_pipe_logger/releases/download/v0.0.5/gcloud_pipe_logger_0.0.5_linux_amd64
 RUN chmod a+x /usr/local/bin/gcloud_logger
 
-RUN useradd -m user
-RUN su user
-ENV HOME=/home/user
-WORKDIR $HOME
-
 RUN curl -o /etc/hosts https://raw.githubusercontent.com/StevenBlack/hosts/master/alternates/fakenews-gambling-porn-social/hosts
 
+RUN useradd -m user --home /app
+USER user
+ENV HOME=/app
+WORKDIR /app
+
 # These are needed to detect versions
 ADD .travis.yml .
 ADD ./webext/manifest.json .
 
 # Setup Firefox
-ENV PATH="/home/user/bin/firefox:${PATH}"
+ENV PATH="/app/bin/firefox:${PATH}"
 ADD ./interfacer/contrib/setup_firefox.sh .
 RUN ./setup_firefox.sh
 RUN rm ./setup_firefox.sh && rm .travis.yml
@@ -33,11 +33,11 @@ RUN ./setup_browsh.sh
 # that all future runs will be consistent.
 RUN TERM=xterm script \
       --return \
-      -c "/home/user/browsh" \
+      -c "/app/browsh" \
       /dev/null \
       >/dev/null & \
       sleep 10
 RUN rm ./setup_browsh.sh && rm manifest.json
 
-CMD ["/home/user/browsh"]
+CMD ["/app/browsh"]
 

interfacer/src/browsh/browsh.go

@@ -28,8 +28,9 @@ var (
 	isUseExistingFirefox = flag.Bool("use-existing-ff", false, "Whether Browsh should launch Firefox or not")
 	useFFProfile         = flag.String("ff-profile", "default", "Firefox profile to use")
 	isDebug              = flag.Bool("debug", false, "Log to ./debug.log")
-	StartupURL           = flag.String("startup-url", "https://google.com", "URL to launch at startup")
 	timeLimit            = flag.Int("time-limit", 0, "Kill Browsh after the specified number of seconds")
+	// StartupURL is the URL of the first tab at boot
+	StartupURL           = flag.String("startup-url", "https://google.com", "URL to launch at startup")
 	// IsHTTPServer needs to be exported for use in tests
 	IsHTTPServer         = flag.Bool("http-server", false, "Run as an HTTP service")
 	// HTTPServerPort also needs to be exported for use in tests

interfacer/src/browsh/comms.go

@@ -144,9 +144,7 @@ func webSocketServer(w http.ResponseWriter, r *http.Request) {
 	} else {
 		sendTtySize()
 	}
-	if IsTesting {
-		// For some reason, using Firefox's CLI arg `--url https://google.com` doesn't consistently
-		// work on Travis. So we do it here inse
-		sendMessageToWebExtension("/new_tab," + *StartupURL)
-	}
+	// For some reason, using Firefox's CLI arg `--url https://google.com` doesn't consistently
+	// work. So we do it here instead.
+	sendMessageToWebExtension("/new_tab," + *StartupURL)
 }

interfacer/src/browsh/firefox.go

@@ -10,6 +10,7 @@ import (
 	"os/exec"
 	"runtime"
 	"strings"
+	"regexp"
 	"time"
 
 	"github.com/gdamore/tcell"
@@ -18,6 +19,7 @@ import (
 
 var (
 	marionette     net.Conn
+	isMarionetteListening = false
 	ffCommandCount = 0
 	defaultFFPrefs = map[string]string{
 		"browser.startup.homepage":                "'https://www.google.com'",
@@ -52,6 +54,8 @@ var (
 )
 
 func startHeadlessFirefox() {
+	var isMarionette, isListening bool
+	checkIfFirefoxIsAlreadyRunning()
 	Log("Starting Firefox in headless mode")
 	ensureFirefoxBinary()
 	args := []string{"--marionette"}
@@ -77,10 +81,22 @@ func startHeadlessFirefox() {
 	}
 	in := bufio.NewScanner(stdout)
 	for in.Scan() {
+		isMarionette = strings.Contains(in.Text(), "Marionette")
+		isListening = strings.Contains(in.Text(), "Listening on port")
+		if isMarionette && isListening { isMarionetteListening = true }
 		Log("FF-CONSOLE: " + in.Text())
 	}
 }
 
+func checkIfFirefoxIsAlreadyRunning() {
+	if runtime.GOOS == "windows" { return }
+	processes := Shell("ps aux")
+	r, _ := regexp.Compile("firefox.*--headless")
+	if r.MatchString(processes) {
+		Shutdown(errors.New("A headless Firefox is already running"))
+	}
+}
+
 func ensureFirefoxBinary() {
 	if *firefoxBinary == "firefox" {
 		switch runtime.GOOS {
@@ -199,15 +215,6 @@ func sendFirefoxCommand(command string, args map[string]interface{}) {
 	readMarionette()
 }
 
-func loadHomePage() {
-	// Wait for the CLI websocket server to start listening
-	time.Sleep(200 * time.Millisecond)
-	args := map[string]interface{}{
-		"url": *StartupURL,
-	}
-	sendFirefoxCommand("get", args)
-}
-
 func setDefaultPreferences() {
 	for key, value := range defaultFFPrefs {
 		setFFPreference(key, value)
@@ -233,12 +240,19 @@ func setupFirefox() {
 	if (*timeLimit > 0) {
 		go beginTimeLimit()
 	}
-	// TODO: Do something better than just waiting
-	time.Sleep(3 * time.Second)
+	waitForMarionette()
 	firefoxMarionette()
 	setDefaultPreferences()
 	installWebextension()
-	go loadHomePage()
+}
+
+func waitForMarionette() {
+	start := time.Now()
+	for time.Since(start) < 60 * time.Second {
+		if isMarionetteListening { return }
+		time.Sleep(10 * time.Millisecond)
+	}
+	Shutdown(errors.New("Marionette didn't start within 60 seconds."))
 }
 
 func startFirefox() {

webext/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Browsh",
-  "version": "1.0.8",
+  "version": "1.0.9",
 
   "description": "Renders the browser as realtime, interactive, TTY-compatible text",