Licensing issue with non root user

[Mythique]

If I run the editor in batch mode, and set the user parameter, I end up with this error :

[Licensing::Module] Trying to connect to existing licensing client channel...
[Licensing::IpcConnector] Connection attempt to the License Client on channel: "LicenseClient-" failed because channel doesn't exist; code: "0x80000002"
[Licensing::Module] Successfully launched the LicensingClient (PId: 9)
[Licensing::IpcConnector] Connection attempt to the License Client on channel: "LicenseClient-" failed because channel doesn't exist; code: "0x80000002"
[Licensing::Module] Timed-out after 60.00s, waiting for channel: "LicenseClient-"
IPC channel to LicensingClient doesn't exist; aborting

This is the command that was started:

docker run --user 10000:1004 --rm --volume "pathToUnityProject":/app --workdir /app unityci/editor:ubuntu-2020.3.48f1-android-3.0.1 /bin/bash -c "./AnotherScript.sh"

Here is the content of ./AnotherScript.sh:

/opt/unity/Editor/Unity -batchmode -nographics -quit -projectPath /app  -logFile logAndroid.txt -noUpm -username 'username'  -password 'password' -serial SERIAL -executeMethod AssetBundleCreator.BuildAsset

If I try to run the same command without specifying a user, Unity is started properly and the BuildAsset method is executed.

Unfortunately, having the possibility to run as another user would solve one of my issue. I'll explain it briefly, just to show my use case:

• A program will write files, as the user 10000.
• Unity will read this files and generate new ones. By default they are written with root as the owner.
• The program will read this file after the process, but won't be able to modify or delete them because of the ownership.

There's of course other ways to fix my issue, but I'm surprised that I can not run the program as another user. I don't know if it is a bug with Unity, your docker image, or maybe a misunderstanding from my part.

[NoTuxNoBux]

My use case is slightly different, but I would also find it beneficial to have at least one non-root user in the default images. I've currently extended them to add the following:

RUN useradd -ms /bin/bash default

USER default

The reason is I'm working in a very constrained enterprise Jenkins environment, currently, and I may not do anything that requires root nor have any public internet access. With this setup I've gotten Unity to start as user and can use a non-root user home folder instead.

I've also learned that you must run as a UID that has a username assigned, or the UnityHub, at least in 6000.1.2f1, will crash with a .NET exception trying to figure out the username, then fail, and then try to use a root folder for its cache and other folders. root of course works, but you can't just select a non-existent UID for example (which is fine for Kubernetes, but not for Unity).

Of course extending is straightforward, but it's difficult in my case because to extend an image, docker must first push the base image layers as well (once), so that means the whole base image gets pushed as well. This in turn is hitting Azure Application Gateway upload limit in our customer's enterprise environment, which is 4 GB at most (and cannot be upped at the time of writing). I'm hitting these limits even with the base image. The only fix is to bypass the gateway or to split up the base image COPY <Unity> <Image> into multiple layers - hardly the fault of these images, of course, but rather Unity for shipping too much in their distributions, I'm just mentioning it for completeness to indicate that even extending is difficult for me and needs to happen again for every Unity version update or variant (as the base image layer hash changes).

EDIT: In case someone else is constrained like me, it is possible to abuse the sync user in the base images for this purpose. It's not optimal, but you can basically:

1. Start the container image with UID 65534 (sync user).
2. Set HOME=/tmp/sync (it's /bin by default, which needs root to write to).
3. mkdir -p $HOME.
4. Do things you need as user, such as expand ~ in bash, place your license file in ~/.local/share/unity3d/Unity, and so on.