#!/bin/sh
#
# OVERVIEW
#
#   System Sanity Check
#
# DESCRIPTION
#
#   This script is launched at the start of Makefile to detect if
#   binfmt_misc was tuned to launch 'MZ' shell scripts under WINE

if [ x`uname -s` != xLinux ]; then
  cat <<'EOF' >&2

ERROR

  Want Linux Build Environment

DETAILS

  Cosmopolitan builds binaries that run on all major platforms.
  You need to compile them on Linux, using any distro you like.
  Consider setting up Alpine, Debian, or Ubuntu in a VMWare VM.

EOF
  kill $1
  exit 1
fi

build/sanitycheck2
if [ $? -ne 123 ]; then
  cat <<'EOF' >&2

ERROR

  Thompson Shell Backwards Compatibility Issue Detected

DETAILS

  Actually Portable Executable assumes stock Linux configuration.
  Normal behavior is non-ELF files with x bit are run by /bin/sh.
  Linux lets people globally define arbitrary magic interpreters.
  Your computer couldve been tuned to run MZ scripts inside WINE.
  So if you use binfmt_misc you need to explicitly register this.

WORKAROUND

  sudo sh -c "echo ':APE:M::MZqFpD::/bin/sh:' >/proc/sys/fs/binfmt_misc/register"

SEE ALSO

  https://justine.storage.googleapis.com/ape.html

EOF
  kill $1
  exit 1
fi