DevTools: find and launch chrome in debug mode

third_party/WebKit/Source/devtools/scripts/chrome_debug_launcher/launch_chrome.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var childProcess = require("child_process");
+var fs = require("fs");
+var path = require("path");
+var shell = childProcess.execSync;
+
+var remoteDebuggingPort = parseInt(process.env.REMOTE_DEBUGGING_PORT, 10) || 9222;
+var serverPort = parseInt(process.env.PORT, 10) || 8090;
+
+var chromeArgs = [
+    `--remote-debugging-port=${remoteDebuggingPort}`,
+    `--no-first-run`,
+    `http://localhost:${remoteDebuggingPort}#http://localhost:${serverPort}/front_end/inspector.html?experiments=true`,
+    `https://devtools.chrome.com`
+].concat(process.argv.slice(2));
+
+if (process.platform === "win32") {
+    launchChromeWindows();
+    return;
+}
+if (process.platform === "darwin") {
+    launchChromeMac();
+    return;
+}
+if (process.platform === "linux") {
+    launchChromeLinux();
+    return;
+}
+
+throw new Error(`Unrecognized platform detected: ${process.platform}`);
+
+function launchChromeWindows()
+{
+    var chromeCanaryPath;
+    var suffix = "\\Google\\Chrome SxS\\Application\\chrome.exe";
+    var prefixes = [process.env.LOCALAPPDATA, process.env.PROGRAMFILES, process.env["PROGRAMFILES(X86)"]];
+    for (var i = 0; i < prefixes.length; i++) {
+        var prefix = prefixes[i];
+        try {
+            chromeCanaryPath = path.join(prefix, suffix);
+            fs.accessSync(chromeCanaryPath);
+            break;
+        } catch (e) {
+        }
+    }
+    launchChrome(chromeCanaryPath, chromeArgs);
+}
+
+function launchChromeMac()
+{
+    var lsregister = "/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister";
+    var chromeCanaryPath = shellOutput(`${lsregister} -dump | grep -i 'applications/google chrome canary.app$' | awk '{$1=""; print $0}' | head -n 1`);
+    var chromeCanaryExecPath = `${chromeCanaryPath}/Contents/MacOS/Google Chrome Canary`;
+    var tmpProfileDir = shellOutput("mktemp -d -t devtools");
+    chromeArgs.push(`--user-data-dir=${tmpProfileDir}`);
+    launchChrome(chromeCanaryExecPath, chromeArgs, () => shell(`rm -r ${tmpProfileDir}`));
+}
+
+function launchChromeLinux()
+{
+    var tmpProfileDir = shellOutput("mktemp -d -t devtools.XXXXXXXXXX");
+    chromeArgs.push(`--user-data-dir=${tmpProfileDir}`);
+    launchChrome(process.env.CHROMIUM_PATH, chromeArgs, () => shell(`rm -r ${tmpProfileDir}`));
+}
+
+function launchChrome(filePath, chromeArgs, cleanup)
+{
+    console.log(`Launching Chrome from ${filePath}`);
+    console.log("Chrome args:", chromeArgs.join(" "), "\n");
+    var child;
+    try {
+        child = childProcess.spawn(filePath, chromeArgs, {
+            stdio: "ignore",
+        });
+    } catch (error) {
+        onLaunchChromeError();
+    }
+    child.on("error", onLaunchChromeError);
+    child.on("exit", onExit);
+    function onExit(code)
+    {
+        if (cleanup)
+            cleanup();
+        console.log("Exited Chrome with code", code);
+    }
+}
+
+function onLaunchChromeError()
+{
+    if (process.platform !== "linux") {
+        console.log("Cannot find Chrome Canary on your computer");
+        console.log("Install Chome Canary at:");
+        console.log("https://www.google.com/chrome/browser/canary.html\n");
+    } else {
+        console.log("The environment variable CHROMIUM_PATH must be set to executable of a build of Chromium");
+        console.log("If you do not have a recent build of chromium, you can get one from:");
+        console.log("https://download-chromium.appspot.com/\n");
+    }
+}
+
+function print(buffer)
+{
+    var string = buffer.toString();
+    console.log(string);
+    return string;
+}
+
+function shellOutput(command)
+{
+    return shell(command).toString().trim();
+}