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On our continuous integration environment (Windows server + Mac Mini), more than 30% of our Xamarin.Ios project build fails randomly.
1. Have a MsBuild script with a target to build a solution containing a Xamarin iOs project like:
<Target Name="BuildIOS" Condition=" '$(SkipIOSBuild)' == 'false' ">
<!-- Build iOS package (IPA) -->
<MSBuild Projects="$(IOSProjectPath)" Targets="$(IOSMsbuildTargets)" Properties="$(IOSMsbuildProperties)" />
2. Script is launched periodically, typically on each commit (we're using CCNet for this)
Randomly we get the following message:
The Build Agent 'Build 18.104.22.1683' is not running on the Mac. Please ensure that the assembly versions between the XMA Agents and the XMA clients matches. A compatible Build Agent is needed in order to finish the build.
Statistically, about 30% of our builds fails which is huge.
100% of the build shoud pass except if we have a real compilation error.
On the Mac build log, here is what we get:
Xamarin.Messaging.Build.BuildAgent: Information: 0: Stopping Agent: Build: 2018-01-09 10:12:44Z
System.Net.Mqtt.Sdk.MqttClientImpl: Error: 0: No session has been found for the client
at System.Net.Mqtt.Sdk.MqttClientImpl.CloseClientSession () [0x00098] in <65aadb65fa...>
at System.Net.Mqtt.Sdk.MqttClientImpl+d__34.MoveNext () [0x00035] in <65aadb65fa...>
System.Net.Mqtt.Sdk.MqttClientImpl: Information: 0: Client - Disposing. Reason: Error:
Extracted from the Windows build log:
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\iOS\Xamarin.iOS.Windows.After.targets(63,5): warning : Failed to execute 'which mono64': ExitStatus = 1
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\iOS\Xamarin.iOS.Windows.After.targets(63,5): error : The Build Agent 'Build 22.214.171.1243' is not running on the Mac. Please ensure that the assembly versions between the XMA Agents and the XMA clients matches. A compatible Build Agent is needed in order to finish the build.
Xamarin.iOS.Windows.After.targets line 63 runs the following MSBuild target:
So it looks like SayHello MSBuild task randomly fails even tough the connection to the Mac is alive and running.