[Bug 234315] [patch] dump(8): Allow noninteractive multi-volume dumps

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234315

            Bug ID: 234315
           Summary: [patch] dump(8): Allow noninteractive multi-volume
                    dumps
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: noah.bergbauer at tum.de

Created attachment 200412
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200412&action=edit
Proposed patch

Right now dump(8) requires the user to type "yes" into the console whenever it
switches to a new volume. This makes sense for tape drives but is a problem
when one wants to invoke dump automatically/noninteractively, e.g. from
cron(8). The pipecommand (-P) option could be a great solution (just invoke a
script that handles all the heavy lifting) but there's no way to turn off the
questions. Not even yes(1) can solve this as dump(8) always explicitly reads
from /dev/tty instead of stdin.

This patch simply adds a flag to skip the query.

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