docker-entrypoint

#!/bin/bash
# Author: Satish Gaikwad <satish@satishweb.com>
set -e

if [ -f /run/secrets/DEBUG ]; then
    export DEBUG=$(cat $i)
fi

if [ "$DEBUG" = "1" ]; then
    set -x
    BASH_CMD_FLAGS='-x'
fi

DOH_CONFIG_SAMPLE_FILE=/server/doh-server.sample.conf
DOH_CONFIG_FILE=/server/doh-server.conf
DOH_CONFIG_CUSTOM_FILE=/server-custom/doh-server.conf

printf "|---------------------------------------------------------------------------------------------\n";
printf "| Starting DNS Over HTTP Service \n"



if [ -f "${DOH_CONFIG_CUSTOM_FILE}" ]; then
    printf "| ENTRYPOINT: \033[0;31mUse custom server config...\033[0m\n"
    cat "${DOH_CONFIG_CUSTOM_FILE}" > "${DOH_CONFIG_FILE}"
else
    # Load env vars
    printf "| ENTRYPOINT: \033[0;31mLoading docker secrets if found...\033[0m\n"
    for i in $(env|grep '/run/secrets'); do
        varName=$(echo $i|awk -F '[=]' '{print $1}'|sed 's/_FILE//')
        varFile=$(echo $i|awk -F '[=]' '{print $2}')
        exportCmd="export $varName=$(cat $varFile)"
        echo "${exportCmd}" >> /etc/profile
        eval "${exportCmd}"
        printf "| ENTRYPOINT: Exporting var: $varName\n"
    done

    # lets generate config file by replacing all variables inside of it.
    TMP_FILE=/tmp/doh-server.conf
    cp ${DOH_CONFIG_SAMPLE_FILE} ${TMP_FILE}
    DOLLAR='$' envsubst < /tmp/doh-server.conf > ${DOH_CONFIG_FILE}
    rm ${TMP_FILE}
fi

# Check if app-config is present
if [ -f /app-config ]; then
    # We expect that app-config handles the launch of app command
    echo "| ENTRYPOINT: Executing app-config..."
    . /app-config "$@"
else
    # Let default CMD run if app-config is missing
    echo "| ENTRYPOINT: app-config was not available, running given parameters or default CMD..."
    exec $@
fi