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Unprivileged overlay (kernel supported)
Is your feature request related to a problem? Please describe.
Cannot use overlays when running SingularityCE unprivileged. However, newer kernels, including some backports to older distros, support this flow.
Describe the solution you'd like
Allow SingularityCE to use kernel support for unprivileged overlays.
This is usable from kernel 5.13 - ref -https://www.redhat.com/sysadmin/podman-rootless-overlay
We should implement this ASAP as it's basically just relaxing some checks and ensuring the flow is correct through the overlay attempts.