#!/usr/bin/env sh

#

# Copyright (C) 2025 Igalia S.L.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# 1. Redistributions of source code must retain the above copyright notice, this

# list of conditions and the following disclaimer.

# 2. Redistributions in binary form must reproduce the above copyright notice,

# this list of conditions and the following disclaimer in the documentation

# and/or other materials provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR

# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

set -eu

SCRIPTPATH="$(realpath -- "${0}")"

SCRIPTDIR="$(dirname -- "${SCRIPTPATH}")"

WEBKITDIR="$(realpath -- "${SCRIPTDIR}/../..")"

WEBKIT_SOURCE_DIR="${WEBKIT_SOURCE_DIR:-${WEBKITDIR}}"

WEBKIT_SOURCE_DIR="$(realpath -m -- "${WEBKIT_SOURCE_DIR}")"

help() {

cat <<EOF

Usage: ${0} program-to-execute [arguments...]

${0} --create-symlink

This script is used by the WebKit tooling when running inside the

webkit-container-sdk for GTK/WPE port development. It enables building

WebKit and running tests inside a common path at /sdk/webkit.

Options:

-h, --help Show this help message

--create-symlink Create /sdk/webkit as a symlink to ${WEBKIT_SOURCE_DIR}

and exit. Useful for tools not executed through this

wrapper (like gdb) that need to resolve /sdk/webkit paths.

Default behavior:

Creates a private mount namespace where /sdk/webkit is a bind-mount

to ${WEBKIT_SOURCE_DIR}, then executes the specified program.

Examples:

${0} Tools/Scripts/build-webkit --wpe --release

${0} --create-symlink

EOF

exit 0

}

error() {

printf '%s\n' "${@}" 1>&2

exit 1

}

# If path starts with ${WEBKIT_SOURCE_DIR}, replace that prefix with /sdk/webkit.

maybe_replace_path_prefix_to_rootsdk() {

case "${1}" in

"${WEBKIT_SOURCE_DIR}"|"${WEBKIT_SOURCE_DIR}"/*)

printf '%s\n' "/sdk/webkit${1#"${WEBKIT_SOURCE_DIR}"}"

;;

*)

printf '%s\n' "${1}"

;;

esac

}

resolve_relpath_to_abs_if_outside() {

abs=$(realpath -m -- "${ORGPWD}/${1}")

case "${abs}" in

"${WEBKIT_SOURCE_DIR}"|"${WEBKIT_SOURCE_DIR}"/*)

# Inside the tree: keep original relative value

printf '%s\n' "${1}"

;;

*) # relative path outside the tree: make it absolute

printf '%s\n' "${abs}"

;;

esac

}

maybe_update_relpath_to_abs_if_outside() {

case "${1}" in

""|/*|*://*)

# do not touch if is empty or looks like an abs path or a URL

printf '%s\n' "${1}"

;;

.|..|./*|../*|*/*)

resolve_relpath_to_abs_if_outside "${1}"

;;

*)

if [ -L "${1}" ]; then

resolve_relpath_to_abs_if_outside "${1}"

else

printf '%s\n' "${1}"

fi

;;

esac

}

# Convert relative paths to absolute if they point outside ${WEBKIT_SOURCE_DIR}

args_maybe_update_outside_relpaths() {

for arg in "${@}"; do

case "${arg}" in

--*=*) # handle arguments like "--option=value"

key="${arg%%=*}"

val="${arg#*=}"

val="$(maybe_update_relpath_to_abs_if_outside "${val}")"

arg="${key}=${val}"

;;

*)

arg="$(maybe_update_relpath_to_abs_if_outside "${arg}")"

;;

esac

printf "'"

printf '%s' "${arg}" | sed "s/'/'\\\\''/g"

printf "' "

done

}

[ "$#" -ge 1 ] || help

[ "${1}" = "--help" ] && help

[ "${1}" = "-h" ] && help

[ -d "${WEBKIT_SOURCE_DIR}" ] || error "Can't find directory: ${WEBKIT_SOURCE_DIR}"

[ -d /sdk ] || error "Can't find /sdk directory"

[ -w /sdk ] || error "Directory /sdk is not writable for user $(whoami)"

case "${WEBKIT_SOURCE_DIR}" in

/sdk|/sdk/*) error "${0} should not be invoked with WEBKIT_SOURCE_DIR under /sdk directory" ;;

esac

if [ "${1}" = "--create-symlink" ]; then

[ "$#" -ge 2 ] && error "No extra arguments can be passed with --create-symlink"

if [ -L "/sdk/webkit" ]; then

CURSYMLINKDEST="$(realpath -m -- /sdk/webkit)"

if [ "${CURSYMLINKDEST}" != "${WEBKIT_SOURCE_DIR}" ]; then

rm -f "/sdk/webkit"

ln -s "${WEBKIT_SOURCE_DIR}" "/sdk/webkit"

echo "Symlink at /sdk/webkit changed from ${CURSYMLINKDEST} to ${WEBKIT_SOURCE_DIR}"

fi

elif ! [ -e "/sdk/webkit" ]; then

ln -s "${WEBKIT_SOURCE_DIR}" "/sdk/webkit"

else

error "ERROR: /sdk/webkit exists and is not a symlink. This is unexpected"

fi

exit 0

fi

CURUID="$(id -u)"

CURGID="$(id -g)"

ORGPWD="$(pwd)"

SDKPWD="$(maybe_replace_path_prefix_to_rootsdk "${ORGPWD}")"

# Try also with the realpath, just in case pwd is inside a symlinked dir.

if [ "${ORGPWD}" = "${SDKPWD}" ]; then

ORGPWD="$(realpath -- "${ORGPWD}")"

SDKPWD="$(maybe_replace_path_prefix_to_rootsdk "${ORGPWD}")"

fi

# When $(pwd) is inside ${WEBKIT_SOURCE_DIR}, switch (cd) to the equivalent bind-mount path

# under /sdk/webkit. Any relative path arguments that point outside ${WEBKIT_SOURCE_DIR} are

# converted to absolute paths first, since they wouldn't resolve correctly after the switch.

[ "${ORGPWD}" != "${SDKPWD}" ] && eval "set -- $(args_maybe_update_outside_relpaths "${@}")"

# Since util-linux 2.27 is not needed to execute mount --make-rprivate /

# because unshare does that automatically by default for new mount namespaces

exec unshare -rm sh -c '

set -eu

WEBKIT_SOURCE_DIR="${1}"

SDKPWD="${2}"

CURUID="${3}"

CURGID="${4}"

shift 4

mount -t tmpfs -o size=16M tmpfs /sdk

mkdir /sdk/webkit

mount --bind "${WEBKIT_SOURCE_DIR}" /sdk/webkit

cd "${SDKPWD}"

export WEBKIT_CONTAINER_SDK_INSIDE_MOUNT_NAMESPACE=1

exec unshare --map-user="${CURUID}" --map-group="${CURGID}" -- "${@}"

' -- "${WEBKIT_SOURCE_DIR}" "${SDKPWD}" "${CURUID}" "${CURGID}" "${@}"