[Bug 202058] Installer - Disable dialog(3) for distfetch/checksum/distextract targets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202058

            Bug ID: 202058
           Summary: Installer - Disable dialog(3) for
                    distfetch/checksum/distextract targets
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ganael.laplanche at corp.ovh.com

Created attachment 159488
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=159488&action=edit
Patch against -HEAD

Hi,

While is it possible to use several installer targets in a fully unattended
way, distfetch, checksum and distextract targets always use dialog(3) to
display their status.

Find attached a patch proposal to prevent those targets from using dialog(3) if
the "nonInteractive" environment variable is set.

This would simplify scripting the installer, e.g. over SSH, where a TTY is not
always allocated.

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