DrDaveD

I haven't been able to reproduce those unsquashfs errors, but I have been able to reproduce the fact that uids/gids are not preserved from a base SIF image. It makes...

None of the regular contributors use nix as far as I am aware, so I'm afraid you'll need to track down the cause for this yourself and submit a PR.

I believe that message is coming from the go `os/user` error [`UnknownUserIdError`](https://cs.opensource.google/go/go/+/master:src/os/user/user.go;l=70?q=unknownuseriderror&ss=go%2Fgo). You can look for that symbol in the apptainer source code. I would also compare the `-d` output...

Without the overlay, apptainer would need to modify the sandbox and create the mount points itself, and probably leave them behind when it is done. That's contrary to the behavior...

That is a good question. Now that I think about it, there is an explanation although it is not obvious. With the normal `--writable` sandbox case, no overlayfs is used...

We would not be able to do the second idea reliably, too many things could go wrong, so I would not be in favor of that. I think the first...

I have not been able to reproduce the problem on my el9 VM. What type of filesystem are you trying to build into? When you build with `--sandbox` it unpacks...

Is this a new problem? Does it work with an older version of apptainer?

> If I pull the container from container registry first and then build with 'localimage' bootstrap it works Ok that goes along with what I was saying, that there's different...

Removing 1.4.2 milestone since I haven't had any response to my questions.