nginx-proxy-manager/docker/rootfs/etc/cont-init.d/01_envfile.sh

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#! /bin/bash
# ref: https://github.com/linuxserver/docker-baseimage-alpine/blob/master/root/etc/cont-init.d/01-envfile
# in s6, environmental variables are written as text files for s6 to monitor
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# seach through full-path filenames for files ending in "__FILE"
for FILENAME in $(find /var/run/s6/container_environment/ | grep "__FILE$"); do
echo "[secret-init] Evaluating ${FILENAME##*/}"
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# set SECRETFILE to the contents of the full-path textfile
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SECRETFILE=$(cat ${FILENAME})
# SECRETFILE=${FILENAME}
echo "[secret-init] Setting SECRETFILE to ${SECRETFILE}..." # DEBUG - rm for prod!
# if SECRETFILE exists / is not null
if [[ -f ${SECRETFILE} ]]; then
# strip the appended "__FILE" from environmental variable name ...
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STRIPFILE=$(echo ${FILENAME} | sed "s/__FILE//g")
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echo "[secret-init] Set STRIPFILE to ${STRIPFILE}" # DEBUG - rm for prod!
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# ... and set value to contents of secretfile
# since s6 uses text files, this is effectively "export ..."
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cat $(${SECRETFILE} | xargs) > ${STRIPFILE}
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echo "[secret-init] Set ${STRIPFILE} to $(cat ${STRIPFILE})" # DEBUG - rm for prod!"
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echo "[secret-init] Success! ${STRIPFILE} set from ${FILENAME}"
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else
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echo "[secret-init] cannot find secret in ${FILENAME}"
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fi
done