Xcode Build Server failed. The devices configured for testing were not found

Question

Our Xcode Build Server fails and does not perform any tests anymore. Version 8.3 (8e162)

It simply fails with the Statement:

Build Service Issue

Error The devices configured for testing were not found.

When I do select "Fix it" one gets simply redirected to "Edit Bot" -> "Devices" in the bot's settings. Sometimes the iOS Device lists now loads way longer (~15seconds) than it used to be (immediately).

So, when the devices finally show up (if they even show up) and are selected, the following error prompt appears: Internal Error Updating Bot, please try configuring the bot again

The provided solutions here, was no issue for me, as I am logged in at the bot: xcode bots edit failed

Has anyone found

1. a reason for this, why this error seams to suddenly occur
2. a solution for this? Downgrading to an older xCode version is unfortunately no option for me as suggested here: https://forums.developer.apple.com/thread/76453 as I already got the version, to which the user downgraded.

Is something suddenly wrong with shared schemes or something or was misconfigured that might lead to the problem?

Before I do create the bot over again, I would really like to fix the bot, to keep the history of the builds etc.

Answer 1

Found a solution provided by user @juce on github. Link to original response in Apple Developer Forum

Here' is a link to github post explained a details by @juke:

Copy of script:

--- deviceClass.js  2017-05-05 07:10:40.000000000 -0700
+++ deviceClass.js.NEW  2017-05-05 07:13:36.000000000 -0700
@@ -12,6 +12,7 @@
     dbCoreClass = require('./dbCoreClass.js'),
     xcsutil = require('../util/xcsutil.js'),
     logger = require('../util/logger.js'),
+    fs = require('fs'),
     redisClass = require('./redisClass.js');

 /* XCSDeviceClass object */
@@ -141,12 +142,11 @@
         query.endkey = [unitTestUUID, {}];
     }

-    redisClass.getDynamicQuery(req, doc_type, function DEVListRedisGetDynamicQuery(err, docs) {
-        if (err) {
-            opFailed(err);
-        } else if (docs) {
+    var devicesFile = '/Library/Developer/XcodeServer/Logs/xcs_devices.json';
+    fs.readFile(devicesFile, 'utf8', function (err,docs) {
+        if (docs) {
             docs = JSON.parse(docs);
-            log.info('Found', docs.length, 'devices in Redis.');
+            log.info('Found', docs.length, 'devices in file-system cache.');
             opSucceeded(docs);
         } else {
             log.debug('No devices found in Redis. Falling back to CouchDB.');
@@ -167,9 +167,12 @@
                 } else {
                     log.info('Found', docs.length, 'devices in CouchDB.');

-                    redisClass.setDynamicQuery(req, doc_type, JSON.stringify(docs), function DEVListRedisSetDynamicQuery(err, wasSaved) {
-                        if (wasSaved) {
-                            log.debug('Successfully cached devices to Redis.');
+                    fs.writeFile(devicesFile, JSON.stringify(docs), 'utf8', function(err) {
+                        if (err) {
+                            log.debug('Problem saving devices into ' + devicesFile);
+                        }
+                        else {
+                            log.debug('Successfully cached devices to file.');
                         }
                         // Even if there's an error (i.e. Redis suddenly went down), we can still continue since
                         // the next request would be redirected to CouchDB.

How to apply. Download or copy this script, and path existing file like this:

[sudo] cd /Library/Developer/XcodeServer/CurrentXcodeSymlink/Contents/Developer/usr/share/xcs/xcsd/classes
    patch deviceClass.js /path/to/xcs-tweaks/xcs-devices-patch.diff

Then restart the simulator and possibly restart your machine (that was my case). Then check if it's working by: sudo xcrun xcscontrol --list-simulators

Big thanks @juke whoever you are :)