Add firmware updater scripts from the firmware repo and the dependent blhost binaries.

packages/usb/shared.js

@@ -0,0 +1,64 @@
+require('shelljs/global');
+
+function checkFirmwareImage(imagePath, extension) {
+    if (!imagePath) {
+        echo('No firmware image specified');
+        exit(1);
+    }
+
+    if (!imagePath.endsWith(extension)) {
+        echo(`Firmware image extension is not ${extension}`);
+        exit(1);
+    }
+
+    if (!test('-f', imagePath)) {
+        echo('Firmware image does not exist');
+        exit(1);
+    }
+}
+
+function getBlhostCmd(pid) {
+    let blhostPath;
+    switch (process.platform) {
+        case 'linux':
+            blhostPath = 'linux/amd64/blhost';
+            break;
+        case 'darwin':
+            blhostPath = 'mac/blhost';
+            break;
+        case 'win32':
+            blhostPath = 'win/blhost.exe';
+            break;
+        default:
+            echo('Your operating system is not supported');
+            exit(1);
+            break;
+    }
+
+    return `${__dirname}/blhost/${blhostPath} --usb 0x1d50,${pid}`;
+}
+
+function execRetry(command) {
+    let firstRun = true;
+    let remainingRetries = 3;
+    let code;
+    do {
+        if (!firstRun) {
+            console.log(`Retrying ${command}`)
+        }
+        config.fatal = !remainingRetries;
+        code = exec(command).code;
+        config.fatal = true;
+        firstRun = false;
+    } while(code && --remainingRetries);
+}
+
+const exp = {
+    checkFirmwareImage,
+    getBlhostCmd,
+    execRetry,
+}
+
+Object.keys(exp).forEach(function (cmd) {
+  global[cmd] = exp[cmd];
+});