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In the rootless podman doc, it is stated that:

  • Can not use overlayfs driver, but does support fuse-overlayfs
    • Ubuntu supports non root overlay, but no other Linux distros do.

So overlayfs is not mountable in userspace in general, but ubuntu authorizes it, so it's not a technical difficulty (a setuid program could obviously do it).

So,

  • Why is overlayfs in general not mountable from userspace?
  • Why is not podman overriding this behavior to get an ubuntu-like behavior using a setuid program?

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