termux-packages/scripts/build/termux_step_install_service...

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termux_step_install_service_scripts() {
array_length=${#TERMUX_PKG_SERVICE_SCRIPT[@]}
if [ $array_length -eq 0 ]; then return; fi
# TERMUX_PKG_SERVICE_SCRIPT should have the structure =("daemon name" 'script to execute')
if [ $(( $array_length & 1 )) -eq 1 ]; then
termux_error_exit "TERMUX_PKG_SERVICE_SCRIPT has to be an array of even length"
fi
mkdir -p $TERMUX_PREFIX/var/service
cd $TERMUX_PREFIX/var/service
for ((i=0; i<${array_length}; i+=2)); do
mkdir -p ${TERMUX_PKG_SERVICE_SCRIPT[$i]}
# We unlink ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run if it exists to
# allow it to be overwritten through TERMUX_PKG_SERVICE_SCRIPT
if [ -L "${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run" ]; then
unlink "${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run"
fi
echo "#!$TERMUX_PREFIX/bin/sh" > ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run
echo -e ${TERMUX_PKG_SERVICE_SCRIPT[$((i + 1))]} >> ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run
# Do not add service script to CONFFILES if it already exists there
if [[ $TERMUX_PKG_CONFFILES != *${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run* ]]; then
TERMUX_PKG_CONFFILES+=" var/service/${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run"
fi
chmod +x ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/run
# Avoid creating service/<service>/log/log/
if [ "${TERMUX_PKG_SERVICE_SCRIPT[$i]: -4}" != "/log" ]; then
touch ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/down
TERMUX_PKG_CONFFILES+=" var/service/${TERMUX_PKG_SERVICE_SCRIPT[$i]}/down"
mkdir -p ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/log
ln -sf $TERMUX_PREFIX/share/termux-services/svlogger ${TERMUX_PKG_SERVICE_SCRIPT[$i]}/log/run
TERMUX_PKG_CONFFILES+="
var/service/${TERMUX_PKG_SERVICE_SCRIPT[$i]}/log/run
var/service/${TERMUX_PKG_SERVICE_SCRIPT[$i]}/log/down
"
fi
done
}