Running mock in a docker container

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1

For reasons, I’m trying to run mock in a Fedora container, running in docker on Ubuntu. When I do, mock fails with:

ERROR: Command failed: 
 # /bin/mount -n -t tmpfs -o rprivate tmpfs /var/lib/mock/fedora-38-x86_64-bootstrap/root/proc

I did a little web searching, and found a fedora-devel thread from 2020 that indicates certain Linux capabilities need to be added to the container. I’ve added SYS_ADMIN as suggested in the thread, and that succeeded in eliminating an earlier, non-fatal warning in mock’s output about unsharing a namespace. However, the attempt to mount tmpfs still fails. Is there another capability that needs to be added to the container to allow this mount to succeed?

2

The container also needed to run with the --privileged flag.

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3

What’s the full command/setup you use?