File: warn-outside-container

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#!/usr/bin/env sh
set -eu

target="${1:-}"

if [ "$target" != "help" ] && [ -z "${DISABLE_WARN_OUTSIDE_CONTAINER:-}" ]; then
    (
        echo
        echo
        echo "WARNING: you are not in a container."
        echo "Use \"make -f docker.Makefile $target\" or set"
        echo "DISABLE_WARN_OUTSIDE_CONTAINER=1 to disable this warning."
        echo
        echo "Press Ctrl+C now to abort."
        echo
    ) >&2
    sleep 10
fi