[Bug 201300] Let jexec execute shell if no command is issued.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201300

Jamie Gritton <jamie at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jamie at FreeBSD.org
             Status|New                         |In Progress
           Assignee|freebsd-bugs at FreeBSD.org    |jamie at FreeBSD.org

--- Comment #1 from Jamie Gritton <jamie at FreeBSD.org> ---
Created attachment 158629
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158629&action=edit
alternate patch, including -l option

I've kept to the spirit of your patch, but reworked it with a few changes. 
Instead of hard-coding a username "root", I default to leaving the environment
along unless a user (or -l) is specified.  In the absence of a specified user,
I run the current environment's shell instead of root's.  I run the shell with
the "-i" argument, as chroot does.

I've also added a "-l" argument for a "clean" environment, same as jail(8)'s
"exec.clean" parameter.

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