docker-mailserver/target/bin/setquota

#! /bin/bash

# ? This is done to ignore the message "Make sure not to read and write
# ? the same file in the same pipeline", which is a result of ${DATABASE}
# ? being used below. (This disables the message file-wide.)
# shellcheck disable=SC2094

# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh

DATABASE='/tmp/docker-mailserver/dovecot-quotas.cf'
USER_DATABASE='/tmp/docker-mailserver/postfix-accounts.cf'

USER="${1}"
shift
QUOTA="${*}"

function __usage { echo 'Usage: setquota <user@domain> [<quota>]' ; }

[[ -z ${USER} ]] && { __usage ; _exit_with_error "No username specified" ; }
[[ ${USER} =~ .*\@.* ]] || { __usage ; _exit_with_error "Username must include the domain" ; }

grep -qE "^${USER}\|" "${USER_DATABASE}" || _exit_with_error "User '${USER}' does not exist"

if [[ -z ${QUOTA} ]]
then
  read -r -s 'Enter quota (e.g. 10M): ' QUOTA
  echo
  [[ -z "${QUOTA}" ]] && _exit_with_error 'Quota must not be empty (use 0 for unlimited quota)'
fi

# check quota
if ! grep -qE "^([0-9]+(B|k|M|G|T)|0)\$" <<< "${QUOTA}"
then
  __usage
  _exit_with_error 'Invalid quota format. e.g. 302M (B (byte), k (kilobyte), M (megabyte), G (gigabyte) or T (terabyte))'
fi

_create_lock # Protect config file with lock to avoid race conditions
touch "${DATABASE}"

delquota "${USER}"
echo "${USER}:${QUOTA}" >>"${DATABASE}"