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#!/bin/bash -p
###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
# text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2025 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.app/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################
set -e
readonly defaultPath="/etc/brltty.conf"
readonly programPrefix="brltty-"
programName="${0##*/}"
[ "${programName#${programPrefix}}" = "${programName}" ] && programName="${programPrefix}${programName}"
readonly programName
programMessage() {
local message="${1}"
local level="${2}"
logger -p "daemon.${level:-info}" -t "${programName}" -- "${1}" &&
[ ! -t 2 ] ||
echo >&2 "${programName}: ${message}"
}
errorMessage() {
local message="${1}"
local code="${2}"
programMessage "${message}" err
exit "${code:-1}"
}
syntaxError() {
local message="${1}"
errorMessage "${message}" 2
}
semanticError() {
local message="${1}"
errorMessage "${message}" 3
}
instancePath="${BRLTTY_SYSTEMD_INSTANCE:-${defaultPath}}"
[ "${instancePath#/}" = "${instancePath}" ] && instancePath="/${instancePath}"
readonly instancePath
if [ "${instancePath#/sys/}" != "${instancePath}" ]
then
isDeviceInstance=true
udevOption="path"
elif [ -c "${instancePath}" ]
then
isDeviceInstance=true
udevOption="name"
elif [ -f "${instancePath}" ]
then
isDeviceInstance=false
elif [ -e "${instancePath}" ]
then
semanticError "unsupported instance path: ${instancePath}"
else
semanticError "instance path not found: ${instancePath}"
fi
if "${isDeviceInstance}"
then
isUdevManaged=false
while read line
do
if [[ "${line}" =~ ^'N: ' ]]
then
isUdevManaged=true
elif [[ "${line}" =~ ^'E: '([^ =]+)=(.*) ]]
then
name="${BASH_REMATCH[1]}"
value="${BASH_REMATCH[2]}"
[[ "${name}" =~ ^'BRLTTY_' ]] || continue
[ -z "${!name}" ] || continue
export "${name}=${value}"
fi
done < <((udevadm info --"${udevOption}"="${instancePath}" --export 2>/dev/null))
"${isUdevManaged}" || semanticError "instance path not managed by udev: ${instancePath}"
else
export BRLTTY_CONFIGURATION_FILE="${instancePath}"
fi
set -- "${BRLTTY_EXECUTABLE_PATH:-brltty}" -E ${BRLTTY_EXECUTABLE_ARGUMENTS} "${@}"
programMessage "executing command: ${*}" info
exec "${@}"
exit "${?}"
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