#!/bin/sh

for d in /bin /sbin /lib /lib32 /libo32 /libx32 /lib64; do
  linkname="$(readlink $d)"
  if [ "$linkname" = "usr$d" ] || [ "$linkname" = "/usr$d" ]; then
    echo "This system uses merged-usr-via-aliased-dirs, going behind dpkg's" >&3
    echo "back, breaking its core assumptions. This can cause silent file" >&3
    echo "overwrites and disappearances, and its general tools misbehavior." >&3
    echo "See <https://wiki.debian.org/Teams/Dpkg/FAQ#broken-usrmerge>." >&3
    break
  fi
done