Add UID and GID as Environmental Variables

[Sn3ider]

With other ARR services I can define the UID and GID as variables so I don't have to create a YAML config file and on Synology container manager I can define the UID and GID during the initial setup.

[jorenn92]

I also commented this on the original issue, but I'll do it here as well:

@Sn3ider, sorry to bring this issue up again, but weren't you able to use Docker's built-in 'user' directive? We opted to support this mechanism instead of PUID and PGID at some point, as you still have to start the container as root using that approach.

With the user directive, the image is fully rootless from the start. The user you specify in this directive has access to the files and folders of the 'node' user, which is why the file ownership doesn't change.

[Sn3ider]

Gonna copy my answer from there too :)

@jorenn92 technically there is no default user in Synology Container Manager, or I did not find the default IDs on the Synology support side.

The UID and GID needs to be defined for every container upfront if I want the container to save on shared locations.
However, if I am not defining any IDs then the 1000:1000 user will be used. That is not a default user in my Synology NAS, but I could ssh and add the necessary permissions to the folders, but I don't want to provide accesses where I have no proper control over it.

[jorenn92]

So, if I get it right, does Synology Container Manager make you set a UID and GID as environment variables? Is there no way to use the 'user' directive directly? A quick Google search showed that you might be able to set it in the 'Environment' tab or use the 'Command' tab. But since I don't have access to a Synology system myself, I'm not entirely sure how it works.

[Sn3ider]

So, if I get it right, does Synology Container Manager make you set a UID and GID as environment variables? Is there no way to use the 'user' directive directly? A quick Google search showed that you might be able to set it in the 'Environment' tab or use the 'Command' tab. But since I don't have access to a Synology system myself, I'm not entirely sure how it works.

I can set the "user" only in a yaml config file so that is how I made this working.
But in the majority of the time you would just set the environmental variables and run the container. From the standard installation there is no option to change or set the "user" variable.