Pre-Export Method Failure with no details

Unity Services
1

I attempted an iOS build using Unity Cloud Build successfully. I then attempted to add in a Pre-Export Method, but it keeps failing with no explanation.

29602: [Unity] ERROR: preExportMethod 'UnityCloudBuild.OnPreExportIOS' failed, aborting.

After reading previous topics related to this, I believe the reason may be because the method can’t be found, but I’m not sure why that is. I don’t receive any of the Debug logs I manually added, which is another reason I think it can’t be found.

My code is as follows:

using UnityEngine;
using UnityEditor;

public class UnityCloudBuild : MonoBehaviour
{
    public static void OnPreExportIOS()
    {
        Debug.Log("UnityCloudBuild - OnPreExportIOS started");

        FileUtil.DeleteFileOrDirectory("Assets/StreamingAssets/Bundles");
        FileUtil.DeleteFileOrDirectory("Assets/StreamingAssets/Bundles.meta");
        Debug.Log("UnityCloudBuild - Going to Refresh");
        AssetDatabase.Refresh();
    }
}

This is saved within a script in my project, under Assets/Scripts/UnityCloudBuild/UnityCloudBuild.cs

And in the Advanced Options > Pre-Export I enter it as: UnityCloudBuild.OnPreExportIOS

The build has failed after about 2 hours both times, so it’s a bit frustrating not knowing why. Any suggestions would be great.

2

As noted in the docs (Unity Build Automation) the script needs to exist in an Editor/ folder.

1 Like
3

Thank you. That was my exact error. Not sure how I missed that when reading through the documentation!

4

The docs also state that you optionally can add a parameter of type “UnityEngine.CloudBuild.BuildManifestObject”,
But i cant seem to be able to use that CloudBuild namespace. Any news about this?
On the cloud build page it uses the same example, which is a bit irritating.

5

You need to wrap the whole class in a compiler directive, the BuildManifestObject is only available on the cloud build servers apparently.

For example

#if UNITY_CLOUD_BUILD
using UnityEngine;
using UnityEditor;
using System;

public class CloudBuildHelper : MonoBehaviour
{
public static void PreExport(UnityEngine.CloudBuild.BuildManifestObject manifest)
{
PlayerSettings.bundleVersion = $“1.0.{manifest.GetValue(“buildNumber”, “unknown”)}”;
}
}
#endif

1 Like
6

Hi friends, does that manifest provide the build number specifically listed in the cloud build history? Or is it whatever is set within the project. I would prefer to automatically use the cloud build numbering system.

7

Yes the manifest provides the build number that will match the number in the Unity Cloud Build history. It’s available as “buildNumber” in the manifest.

1 Like
8

Just going to assume assembly definition files don’t work with this. Because that would appear to be the case.

Edit: Actually nevermind, cloud build just randomly failed, building again succeeded

9

Hi friends, I attempted to add Pre-Export method to retrieve the build number from the cloud build. But I keep receiving build failed.

Below are the errors

6839474--795983--upload_2021-2-15_21-1-30.png
6839474--795983--upload_2021-2-15_21-1-30.png954×37 10.1 KB

6839474--795986--upload_2021-2-15_21-2-7.png
6839474--795986--upload_2021-2-15_21-2-7.png811×21 6.13 KB

In both iOS and android
Advanced Options > Pre-Export I enter it as: AutoIncrementVersionCodeInCloudBuild.PreExport

Below are my codes

#if UNITY_CLOUD_BUILD
using System;
using UnityEngine;
using UnityEditor;
using System.Collections;
using System.Collections.Generic;

public class AutoIncrementVersionCodeInCloudBuild : MonoBehaviour
{
    public static void PreExport(UnityEngine.CloudBuild.BuildManifestObject manifest)
    {
        string buildNumber = "";
        buildNumber = manifest.GetValue<String>("buildNumber");
        Debug.LogWarning("Prebuild launched build number to " + buildNumber);
        DebugTool.ClientLog("Setting build number to " + buildNumber);
    }
}
#endif

Any suggestions would be appreciate.

10

Your pre-export function can’t be in a class that’s derived from a MonoBehaviour. If you remove the MonoBehaviour part it should work ok.

UCB PreExport method no longer working
11

Thanks for the advice, I also remove the DebugTool.ClientLog, and the build can work fine without having any errors

1 Like