#!/bin/sh

# pressure-vessel-unruntime — undo the Steam Runtime's environment
#
# Copyright © 2017-2022 Collabora Ltd.
#
# SPDX-License-Identifier: MIT
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

set -e
set -u

me="$0"
me="$(readlink -f "$0")"
here="${me%/*}"
me="${me##*/}"

default_path="/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"

# Undo any weird environment before we start running external
# executables. We put it back before running the actual app/game.
# We prepend options to "$@" because that's the only array available
# in generic POSIX /bin/sh, and bash is not always practical to use.

if [ -n "${LD_LIBRARY_PATH-}" ]; then
    set -- "--env-if-host=LD_LIBRARY_PATH=$LD_LIBRARY_PATH" "$@"
fi

if [ -n "${LD_AUDIT-}" ]; then
    set -- "--env-if-host=LD_AUDIT=$LD_AUDIT" "$@"
    set -- "--ld-audits=$LD_AUDIT" "$@"
fi

if [ -n "${LD_PRELOAD-}" ]; then
    set -- "--env-if-host=LD_PRELOAD=$LD_PRELOAD" "$@"
    set -- "--ld-preloads=$LD_PRELOAD" "$@"
fi

if [ -n "${PATH-}" ]; then
    set -- "--env-if-host=PATH=$PATH" "$@"
fi

if [ -n "${STEAM_RUNTIME-}" ]; then
    set -- "--env-if-host=STEAM_RUNTIME=$STEAM_RUNTIME" "$@"
fi

unset LD_AUDIT
unset LD_LIBRARY_PATH
unset LD_PRELOAD
PATH="$default_path"
unset STEAM_RUNTIME

if [ -n "${SYSTEM_LD_LIBRARY_PATH+set}" ]; then
    set -- "--env-if-host=SYSTEM_LD_LIBRARY_PATH=$SYSTEM_LD_LIBRARY_PATH" "$@"
    # This has been superseeded by the new $PRESSURE_VESSEL_APP_LD_LIBRARY_PATH
    # environment variable. When we are sure that we are always using the new
    # _v2-entry-point with $PRESSURE_VESSEL_APP_LD_LIBRARY_PATH support, the
    # following export can be removed
    export LD_LIBRARY_PATH="$SYSTEM_LD_LIBRARY_PATH"
fi

if [ -n "${SYSTEM_LD_PRELOAD+set}" ]; then
    set -- "--env-if-host=SYSTEM_LD_PRELOAD=$SYSTEM_LD_PRELOAD" "$@"
    export LD_PRELOAD="$SYSTEM_LD_PRELOAD"
fi

if [ -n "${STEAM_RUNTIME_LIBRARY_PATH+set}" ]; then
    set -- "--env-if-host=STEAM_RUNTIME_LIBRARY_PATH=$STEAM_RUNTIME_LIBRARY_PATH" "$@"
fi

if [ -n "${SYSTEM_PATH+set}" ]; then
    set -- "--env-if-host=SYSTEM_PATH=$SYSTEM_PATH" "$@"
    export PATH="$SYSTEM_PATH"
fi

unset SYSTEM_LD_LIBRARY_PATH
unset SYSTEM_LD_PRELOAD
unset SYSTEM_PATH

if [ -n "${PRESSURE_VESSEL_APP_LD_LIBRARY_PATH+set}" ]; then
    set -- "--env-if-host=PRESSURE_VESSEL_APP_LD_LIBRARY_PATH=$PRESSURE_VESSEL_APP_LD_LIBRARY_PATH" "$@"
    export LD_LIBRARY_PATH="$PRESSURE_VESSEL_APP_LD_LIBRARY_PATH"
fi

unset PRESSURE_VESSEL_APP_LD_LIBRARY_PATH

exec "$here/pressure-vessel-wrap" "$@"

# vim:set sw=4 sts=4 et: