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

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

# 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

# If UPSTREAM_DNS_SERVER contains a comma (i.e., multiple servers are provided)
if [[ "$UPSTREAM_DNS_SERVER" == *","* ]]; then
    # Convert the comma-separated list into a valid array for the config file
    upstream_servers=$(echo "$UPSTREAM_DNS_SERVER" | sed 's/,/","/g')
    upstream_servers="[\"$upstream_servers\"]"
else
    # If only a single DNS server is provided, use it as before
    upstream_servers="[\"$UPSTREAM_DNS_SERVER\"]"
fi

export upstream_servers

# 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}

# 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