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We need this so as not to confuse tmux, at least for desktop users. The problem is very rare, but it can be reproduced when using tmux on the host and you start/restart the jail (within the tmux session), so the vm-bhyve rc(8) script will try to start the virtual machine with the user's environment, confusing tmux, resulting in the error "error creating /tmp/tmux-<host user UID>/default (No such file or directory)" (which is not easily visible) and, worse, the virtual machine will not start unless it is started manually. Another alternative is the following patch: freebsd/vm-bhyve#25
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This patch uses a private (/var/run/vm-bhyve.sock) socket (and therefore tmux server process) when tmux is enabled rather than sharing with the root user. (For actions like tmux list or tmux attach.)
Note that this update requires shutting down and restarting VMs to be able to attach to them. (Since a running VM pre-update will still be sharing root's tmux server.)