mmdebstrap/tests/error-if-stdout-is-tty

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#!/bin/sh
set -eu
export LC_ALL=C.UTF-8
ret=0
script -qfec "{{ CMD }} --mode={{ MODE }} --variant=apt {{ DIST }} - {{ MIRROR }}" /dev/null || ret=$?
if [ "$ret" = 0 ]; then
echo expected failure but got exit $ret >&2
exit 1
fi