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Building and distributing binaries
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this post was submitted on 31 May 2024
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Flatpak absolutely does use containers for sandboxing. Bubblewrap is wrapper for Linux namespaces. Containers is just another name for the underlying kernel technology called namespaces. Same goes for Docker, LXC, Podman, systemd-nspawn, Firejail, etc. It's all just userland frontends for kernel namespaces.
man bwrap, you can also use the genericunshareto create them andnsenterto enter those same namespaces. It's cool technology, it's very easy to use, a simple flag on your exec or opening of an existing fd is all that is required. I used to work on one of the many userland frontend, even have gotten a couple PRs from Jess Fraz who was one of the core Docker devs. Userns still scares the shit out of me (pretty much every single escape has come from them).Here's a fun experiment for you: create a root fs using debootstrap and then enter it using unshare and chroot! Tada! Container!
I don't believe a chroot is a container. You are just switching root for the process. The same thing happens when you boot with a initramfs
It also might just be a terminology difference
No a chroot is indeed not a container/namespace. I'm not sure what you're getting at here. Flatpak isn't a chroot and what I suggest you try isn't either.