[Bug 266270] freebsd-update cron corrupts freebsd-update upgrade's in progress

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266270

--- Comment #2 from Peter Eriksson <pen@lysator.liu.se> ---
> If a crontab(5) utilizing the features of freebsd-update(8) exists, 
> it must be disabled before upgrading the operating system.

Then perhaps a simple:

if crontab -l | grep -v '^#' | grep 'freebsd-update.*cron'; then
    echo "$0: WARNING: Cron-enabled 'freebsd-update cron' detected, please
disable before running freebsd-update upgrade (see the manual for more
details)"
    exit 1
fi

could be added to the upgrade part of freebsd-update in order to save other
users (not always reading the manuals and/or remembering this warning) from
running into the same issue that is a pain to recover from...

Just a suggestion.

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