docker-baseimage-ubuntu/root/etc/cont-init.d/01-envfile

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#! /bin/bash
if [[ "$(ls /var/run/s6/container_environment/ | xargs)" == *"FILE__"* ]]; then
for FILENAME in /var/run/s6/container_environment/*; do
if [[ "${FILENAME##*/}" == "FILE__"* ]]; then
SECRETFILE=$(cat ${FILENAME})
if [[ -f ${SECRETFILE} ]]; then
FILESTRIP=${FILENAME//FILE__/}
cat ${SECRETFILE} > ${FILESTRIP}
echo "[env-init] ${FILESTRIP##*/} set from ${FILENAME##*/}"
else
echo "[env-init] cannot find secret in ${FILENAME##*/}"
fi
fi
done
fi