[Bug 228066] Jail hook missing between launch and exec.start

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228066

            Bug ID: 228066
           Summary: Jail hook missing between launch and exec.start
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: stefan at gronke.net

There currently is no jail launch hook available between the launch of a jail
and the internal execution of exec.start.

When there is a task that needs to be done on host side that requires the jail
to be running (or needs to know its JID), another hook is required.

Right now vnet.interface does only allow to specify one vnet interface that is
attached to the jail, but it would be need to have a generic hook that allows
adding them manually.

More tasks that require another jail hook on host-side:

- Attaching ZFS storage before the exec.start or command executes
- Attaching multiple VNET interfaces
- Configuring the firewall on the host

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