How to move the container image storage to the SD card on a Steam Deck?

[herzenschein]

Hi, I'd like to move my rootless podman images from my Steam Deck to an external SD card (/run/media/mmcblk0p1/podman/). I want to use it with latest podman.

Context about the Steam Deck: it's an immutable distro without sudo or root. Its default distrobox is too old, so I installed 1.7.1.0; the podman version is 4.5.1.

I am aware of both #20068 and #1916. I tried the following:

1. Running podman system reset

2. Creating a ~/.config/containers/storage.conf with the following contents:

[storage]
driver = "overlay"
graphroot = "/run/media/mmcblk0p1/podman"
rootless_storage_path = "/run/media/mmcblk0p1/podman"

It works for pulling images.

3. Running distrobox create --image <anyimage> which creates a new container

4. Running distrobox enter <anyimagename> to enter said container

Which fails with private: OCI permission denied. It is my understanding that this is a podman issue, not a distrobox issue. I'm asking this here because I found no proper documentation for this, only the aforementioned issues, so it's possible that I'm just missing something in my config file.

[rhatdan]

If this is an SELinux system, it is most likely SELinux settings.

https://github.com/containers/storage/blob/main/docs/containers-storage.conf.5.md#storage-table