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docker-entrypoint.sh
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docker-entrypoint.sh
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#!/usr/bin/env bash
set -Eeuo pipefail
# usage: file_env VAR [DEFAULT]
# ie: file_env 'XYZ_DB_PASSWORD' 'example'
# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
# "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets
# feature)
file_env() {
local var="$1"
local fileVar="${var}_FILE"
local def="${2:-}"
if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
printf >&2 'error: both %s and %s are set (but are exclusive)\n' "$var" "$fileVar"
exit 1
fi
local val="$def"
if [ "${!var:-}" ]; then
val="${!var}"
elif [ "${!fileVar:-}" ]; then
val="$(< "${!fileVar}")"
fi
export "$var"="$val"
unset "$fileVar"
}
function docker_setup_env() {
# TODO
:
}
# is this file is being run or sourced from another script
_is_sourced() {
# https://unix.stackexchange.com/a/215279
[ "${#FUNCNAME[@]}" -ge 2 ] \
&& [ "${FUNCNAME[0]}" = '_is_sourced' ] \
&& [ "${FUNCNAME[1]}" = 'source' ]
}
function _main() {
# if the first arg looks like a flag, assume it's for Gunicorn
if [ "${1:0:1}" = '-' ]; then
set -- gunicorn "$@"
fi
if [ "$1" = 'gunicorn' ]; then
docker_setup_env
exec "$@"
fi
exec "$@"
}
if ! _is_sourced; then
_main "$@"
fi