major refactoring for setup.sh (#1590) (#1595)

* major refactoring for setup.sh (#1590)

* `set -u` stopped dkim generation from defaulting

* changed to bash and implemented simple error logging

* fixed $VOLUME not being set and refactored README as well due to markdownlint showing (valid) complaints

* setup.sh more consistent with braces, return codes, un-setting of variables and error reports and (importantly) test

README.md

@@ -2,7 +2,6 @@
 
 [![Build Status](https://travis-ci.org/tomav/docker-mailserver.svg?branch=master)](https://travis-ci.org/tomav/docker-mailserver) [![Docker Pulls](https://img.shields.io/docker/pulls/tvial/docker-mailserver.svg)](https://hub.docker.com/r/tvial/docker-mailserver/) [![Docker layers](https://images.microbadger.com/badges/image/tvial/docker-mailserver.svg)](https://microbadger.com/images/tvial/docker-mailserver) [![Github Stars](https://img.shields.io/github/stars/tomav/docker-mailserver.svg?label=github%20%E2%98%85)](https://github.com/tomav/docker-mailserver/) [![Github Stars](https://img.shields.io/github/contributors/tomav/docker-mailserver.svg)](https://github.com/tomav/docker-mailserver/) [![Github Forks](https://img.shields.io/github/forks/tomav/docker-mailserver.svg?label=github%20forks)](https://github.com/tomav/docker-mailserver/) [![Gitter](https://img.shields.io/gitter/room/tomav/docker-mailserver.svg)](https://gitter.im/tomav/docker-mailserver)
 
-
 A fullstack but simple mail server (smtp, imap, antispam, antivirus...).
 Only configuration files, no SQL database. Keep it simple and versioned.
 Easy to deploy and upgrade.
@@ -13,13 +12,13 @@ At this point we have merged the next branch based on Debian Buster into master.
 That means the docker image latest uses Buster. The change may break things!
 
 The following possibly breaking changes are known:
+
 - Filebeat is removed and should be handled by another container, see [Wiki](https://github.com/tomav/docker-mailserver/wiki/).
 - Dovecot will be downgraded a little bit (same major version) so that we can use the official Debian version.
 
 If you want to stick to the old version a while longer, either switch to stable or to a specific version.
 If you run into problems, please raise issues and ask for help. Don't forget to provide details.
 
-
 Includes:
 
 - [Postfix](http://www.postfix.org) with smtp or ldap auth
@@ -50,11 +49,13 @@ Before you open an issue, please have a look this `README`, the [Wiki](https://g
 ## Requirements
 
 Recommended:
+
 - 1 CPU
 - 1-2GB RAM
 - Swap enabled for the container
 
 Minimum:
+
 - 1 CPU
 - 512MB RAM
 
@@ -62,14 +63,11 @@ Minimum:
 
 ## Usage
 
-#### Get latest image
+### Get the tools
-
-    docker pull tvial/docker-mailserver:latest
-
-#### Get the tools
 
 Download the docker-compose.yml, the .env and the setup.sh files:
 
+``` SH
 curl -o setup.sh https://raw.githubusercontent.com/tomav/docker-mailserver/master/setup.sh; chmod a+x ./setup.sh
 
 curl -o docker-compose.yml https://raw.githubusercontent.com/tomav/docker-mailserver/master/docker-compose.yml.dist
@@ -77,8 +75,9 @@ Download the docker-compose.yml, the .env and the setup.sh files:
 curl -o .env https://raw.githubusercontent.com/tomav/docker-mailserver/master/.env.dist
 
 curl -o env-mailserver https://raw.githubusercontent.com/tomav/docker-mailserver/master/env-mailserver.dist
+```
 
-#### Create a docker-compose environment
+### Create a docker-compose environment
 
 - Edit the files `.env` and `env-mailserver` to your liking:
   - `.env` contains the configuration for docker-compose
@@ -90,24 +89,35 @@ Download the docker-compose.yml, the .env and the setup.sh files:
 
 **Note:** If you want to use a bare domain (host name equals domain name) see [FAQ](https://github.com/tomav/docker-mailserver/wiki/FAQ-and-Tips#can-i-use-nakedbare-domains-no-host-name).
 
-#### Start Container
+### Starting the Container
+
+``` BASH
 docker-compose up -d mail
+```
 
-#### Create your mail accounts
+### Create your mail accounts
 
+``` BASH
 ./setup.sh email add <user@domain> [<password>]
+```
 
-#### Generate DKIM keys
+### Generate DKIM keys
 
+``` BASH
 ./setup.sh config dkim
+```
 
 Now the keys are generated, you can configure your DNS server by just pasting the content of `config/opendkim/keys/domain.tld/mail.txt` in your `domain.tld.hosts` zone.
 
+### Miscellaneous
+
 #### Restart and update the container
 
+``` BASH
 docker-compose down
 docker pull tvial/docker-mailserver:latest
 docker-compose up -d mail
+```
 
 You're done!
 
@@ -117,7 +127,7 @@ And don't forget to have a look at the remaining functions of the `setup.sh` scr
 
 If you got any problems with SPF and/or forwarding mails, give [SRS](https://github.com/roehling/postsrsd/blob/master/README.md) a try. You enable SRS by setting `ENABLE_SRS=1`. See the variable description for further information.
 
-#### For informational purposes:
+#### For informational purposes
 
 Your config folder will be mounted in `/tmp/docker-mailserver/`. To understand how things work on boot, please have a look at [start-mailserver.sh](https://github.com/tomav/docker-mailserver/blob/master/target/start-mailserver.sh)
 
@@ -125,10 +135,10 @@ Your config folder will be mounted in `/tmp/docker-mailserver/`. To understand h
 
 #### Exposed ports
 
-| Protocol | Opt-in Encryption<sup>1</sup> | Enforced Encryption | Purpose              |
+| Protocol | Opt-in Encryption &#185; | Enforced Encryption | Purpose        |
-|----------|-------------------------------|---------------------|----------------------|
+| :------: | :----------------------: | :-----------------: | :------------: |
-| SMTP     | 25                            | N/A                 | Transfer<sup>2</sup> |
+| SMTP     | 25                       | N/A                 | Transfer&#178; |
-| ESMTP    | 587                           | 465<sup>3</sup>     | Submission           |
+| ESMTP    | 587                      | 465&#179;           | Submission     |
 | POP3     | 110                      | 995                 | Retrieval      |
 | IMAP4    | 143                      | 993                 | Retrieval      |
 
@@ -138,7 +148,9 @@ Your config folder will be mounted in `/tmp/docker-mailserver/`. To understand h
 
 See the [wiki](https://github.com/tomav/docker-mailserver/wiki) for further details and best practice advice, especially regarding security concerns.
 
-##### Examples with just the relevant environmental variables:
+### Examples
+
+#### Just the relevant environmental variables
 
 ```yaml
 version: '2'
@@ -180,9 +192,9 @@ volumes:
     driver: local
 ```
 
-__for ldap setup__:
+#### LDAP setup
 
-```yaml
+``` YAML
 version: '2'
 
 services:
@@ -242,13 +254,15 @@ volumes:
     driver: local
 ```
 
-# Environment variables
+## Environment variables
 
 Please check [how the container starts](https://github.com/tomav/docker-mailserver/blob/master/target/start-mailserver.sh) to understand what's expected. Also if an option doesn't work as documented here, check if you are running the latest image!
 
 Value in **bold** is the default value.
 
-## General
+### Assignments
+
+#### General
 
 ##### DMS_DEBUG
 
@@ -277,8 +291,10 @@ Value in **bold** is the default value.
 
 If you enable Fail2Ban, don't forget to add the following lines to your `docker-compose.yml`:
 
+``` BASH
 cap_add:
   - NET_ADMIN
+```
 
 Otherwise, `iptables` won't be able to ban IPs.
 
@@ -303,21 +319,26 @@ Please read [the SSL page in the wiki](https://github.com/tomav/docker-mailserve
 - **empty** => modern
 - modern => Enables TLSv1.2 and modern ciphers only. (default)
 - intermediate => Enables TLSv1, TLSv1.1 and TLSv1.2 and broad compatibility ciphers.
-  - old => NOT implemented. If you really need it, then customize the TLS ciphers overriding postfix and dovecot settings [ wiki](https://github.com/tomav/docker-mailserver/wiki/
+- old => NOT implemented. If you really need it, then customize the TLS ciphers overriding postfix and dovecot settings [wiki](https://github.com/tomav/docker-mailserver/wiki/)
 
 ##### SPOOF_PROTECTION
+
 Configures the handling of creating mails with forged sender addresses.
+
 - **empty** => Mail address spoofing allowed. Any logged in user may create email messages with a forged sender address. See also [Wikipedia](https://en.wikipedia.org/wiki/Email_spoofing)(not recommended, but default for backwards compatibility reasons)
 - 1 => (recommended) Mail spoofing denied. Each user may only send with his own or his alias addresses. Addresses with [extension delimiters](http://www.postfix.org/postconf.5.html#recipient_delimiter) are not able to send messages.
 
 ##### ENABLE_SRS
+
 Enables the Sender Rewriting Scheme. SRS is needed if your mail server acts as forwarder. See [postsrsd](https://github.com/roehling/postsrsd/blob/master/README.md#sender-rewriting-scheme-crash-course) for further explanation.
+
 - **0** => Disabled
 - 1 => Enabled
 
 ##### PERMIT_DOCKER
 
 Set different options for mynetworks option (can be overwrite in postfix-main.cf) **WARNING**: Adding the docker network's gateway to the list of trusted hosts, e.g. using the `network` or `connected-networks` option, can create an [**open relay**](https://en.wikipedia.org/wiki/Open_mail_relay), [for instance](https://github.com/tomav/docker-mailserver/issues/1405#issuecomment-590106498) if IPv6 is enabled on the host machine but not in Docker.
+
 - **empty** => localhost only
 - host => Add docker host (ipv4 only)
 - network => Add the docker default bridge network (172.16.0.0/12); **WARNING**: `docker-compose` might use others (e.g. 192.168.0.0/16) use `PERMIT_DOCKER=connected-networks` in this case
@@ -328,8 +349,8 @@ Note: you probably want to [set `POSTFIX_INET_PROTOCOLS=ipv4`](#postfix_inet_pro
 ##### VIRUSMAILS_DELETE_DELAY
 
 Set how many days a virusmail will stay on the server before being deleted
-  - **empty** => 7 days
 
+- **empty** => 7 days
 
 ##### ENABLE_POSTFIX_VIRTUAL_TRANSPORT
 
@@ -344,7 +365,7 @@ Enabled by ENABLE_POSTFIX_VIRTUAL_TRANSPORT. Specify the final delivery of postf
 
 - **empty**: fail
 - `lmtp:unix:private/dovecot-lmtp` (use socket)
-- `lmtps:inet:<host>:<port>` (secure lmtp with starttls, take a look at https://sys4.de/en/blog/2014/11/17/sicheres-lmtp-mit-starttls-in-dovecot/)
+- `lmtps:inet:<host>:<port>` (secure lmtp with starttls, take a look at <https://sys4.de/en/blog/2014/11/17/sicheres-lmtp-mit-starttls-in-dovecot/>)
 - `lmtp:<kopano-host>:2003` (use kopano as mailstore)
 - etc.
 
@@ -354,7 +375,6 @@ Set the mailbox size limit for all users. If set to zero, the size will be unlim
 
 - **empty** => 0 (no limit)
 
-
 ##### ENABLE_QUOTAS
 
 - **1** => Dovecot quota is enabled
@@ -383,7 +403,6 @@ Set the message size limit for all users. If set to zero, the size will be unlim
 - **empty** => postmaster@domain.com
 - => Specify the postmaster address
 
-
 ##### POSTSCREEN_ACTION
 
 - **enforce** => Allow other tests to complete. Reject attempts to deliver mail with a 550 SMTP reply, and log the helo/sender/recipient information. Repeat this test the next time the client connects.
@@ -404,13 +423,14 @@ This option has been added in November 2019. Using other format than Maildir is
 - ipv4 => Use only IPv4 traffic. Most likely you want this behind Docker.
 - ipv6 => Use only IPv6 traffic.
 
-Note: More details in http://www.postfix.org/postconf.5.html#inet_protocols
+Note: More details in <http://www.postfix.org/postconf.5.html#inet_protocols>
 
-## Reports
+#### Reports
 
 ##### PFLOGSUMM_TRIGGER
 
 Enables regular pflogsumm mail reports.
+
 - **not set** => No report
 - daily_cron => Daily report for the previous day
 - logrotate => Full report based on the mail log when it is rotated
@@ -421,18 +441,21 @@ If this is not set and reports are enabled with the old options, logrotate will
 ##### PFLOGSUMM_RECIPIENT
 
 Recipient address for pflogsumm reports.
+
 - **not set** => Use REPORT_RECIPIENT or POSTMASTER_ADDRESS
 - => Specify the recipient address(es)
 
 ##### PFLOGSUMM_SENDER
 
 From address for pflogsumm reports.
+
 - **not set** => Use REPORT_SENDER or POSTMASTER_ADDRESS
 - => Specify the sender address
 
 ##### LOGWATCH_INTERVAL
 
 Interval for logwatch report.
+
 - **none** => No report is generated
 - daily => Send a daily report
 - weekly => Send a report every week
@@ -440,12 +463,14 @@ If this is not set and reports are enabled with the old options, logrotate will
 ##### LOGWATCH_RECIPIENT
 
 Recipient address for logwatch reports if they are enabled.
+
 - **not set** => Use REPORT_RECIPIENT or POSTMASTER_ADDRESS
 - => Specify the recipient address(es)
 
 ##### REPORT_RECIPIENT (deprecated)
 
 Enables a report being sent (created by pflogsumm) on a regular basis.
+
 - **0** => Report emails are disabled unless enabled by other options
 - 1 => Using POSTMASTER_ADDRESS as the recipient
 - => Specify the recipient address
@@ -453,12 +478,14 @@ If this is not set and reports are enabled with the old options, logrotate will
 ##### REPORT_SENDER (deprecated)
 
 Change the sending address for mail report
+
 - **empty** => mailserver-report@hostname
 - => Specify the report sender (From) address
 
 ##### REPORT_INTERVAL (deprecated)
 
-  changes the interval in which logs are rotated and a report is being sent (deprecated).
+Changes the interval in which logs are rotated and a report is being sent (deprecated).
+
 - **daily** => Send a daily report
 - weekly => Send a report every week
 - monthly => Send a report every month
@@ -470,6 +497,7 @@ the logs.
 ##### LOGROTATE_INTERVAL
 
 Defines the interval in which the mail log is being rotated.
+
 - **daily** => Rotate daily.
 - weekly => Rotate weekly.
 - monthly => Rotate monthly.
@@ -482,11 +510,10 @@ Also note that by default the logs are lost when the container is recycled. To k
 
 Finally the logrotate interval **may** affect the period for generated reports. That is the case when the reports are triggered by log rotation.
 
-## Spamassassin
+#### Spamassassin
 
 ##### ENABLE_SPAMASSASSIN
 
-
 - **0** => Spamassassin is disabled
 - 1 => Spamassassin is enabled
 
@@ -495,7 +522,6 @@ Use `SPAMASSASSIN_SPAM_TO_INBOX=1` for receiving spam messages.
 
 ##### SPAMASSASSIN_SPAM_TO_INBOX
 
-
 - **0** => Spam messages will be bounced (_rejected_) without any notification (_dangerous_).
 - 1 => Spam messages will be delivered to the inbox and tagged as spam using `SA_SPAM_SUBJECT`.
 
@@ -546,16 +572,18 @@ This will uncomment the respective line in ```/etc/spamassasin/local.cf```
 
 Note: activate this only if you are confident in your bayes database for identifying ham.
 
-## Fetchmail
+#### Fetchmail
 
 ##### ENABLE_FETCHMAIL
+
 - **0** => `fetchmail` disabled
 - 1 => `fetchmail` enabled
 
 ##### FETCHMAIL_POLL
+
 - **300** => `fetchmail` The number of seconds for the interval
 
-## LDAP
+#### LDAP
 
 ##### ENABLE_LDAP
 
@@ -616,7 +644,7 @@ Note: activate this only if you are confident in your bayes database for identif
 - **empty** => no
 - yes => LDAP over TLS enabled for Dovecot
 
-## Dovecot
+#### Dovecot
 
 The following variables overwrite the default values for ```/etc/dovecot/dovecot-ldap.conf.ext```.
 
@@ -644,7 +672,7 @@ The following variables overwrite the default values for ```/etc/dovecot/dovecot
 - Note: The left-hand value is the directory attribute, the right hand value is the dovecot variable.
 - More details on the [Dovecot Wiki](https://wiki.dovecot.org/AuthDatabase/LDAP/PasswordLookups)
 
-## Postgrey
+#### Postgrey
 
 ##### ENABLE_POSTGREY
 
@@ -675,7 +703,7 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 
 Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 
-## SASL Auth
+#### SASL Auth
 
 ##### ENABLE_SASLAUTHD
 
@@ -732,7 +760,7 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
 - **empty** => No sasl_passwd will be created
 - string => `/etc/postfix/sasl_passwd` will be created with the string as password
 
-## SRS (Sender Rewriting Scheme)
+#### SRS (Sender Rewriting Scheme)
 
 ##### SRS_SENDER_CLASSES
 
@@ -764,7 +792,7 @@ you to replace both instead of just the envelope sender.
 - **empty** => Derived from OVERRIDE_HOSTNAME, DOMAINNAME, or the container's hostname
 - Set this if auto-detection fails, isn't what you want, or you wish to have a separate container handle DSNs
 
-## Default Relay Host
+#### Default Relay Host
 
 #### DEFAULT_RELAY_HOST
 
@@ -773,7 +801,7 @@ you to replace both instead of just the envelope sender.
     Format: `[example.com]:587` (don't forget the brackets if you need this to
     be compatible with `$RELAY_USER` and `$RELAY_PASSWORD`, explained below).
 
-## Multi-domain Relay Hosts
+#### Multi-domain Relay Hosts
 
 #### RELAY_HOST
 

setup.sh

@@ -1,68 +1,70 @@
-#!/bin/sh
+#!/bin/bash
 
-##
+# Wrapper for various setup scripts
-# Wrapper for various setup scripts included in the docker-mailserver
+# included in the docker-mailserver
-#
 
+set -euEo pipefail
+trap '_report_err $_ $LINENO $?' ERR
+
+function _report_err()
+{
+  echo "ERROR occured :: source (hint) $1 ; line $2 ; exit code $3 ;;" >&2
+  _unset_vars
+}
+
+function _unset_vars()
+{
+  unset CDIR CRI INFO IMAGE_NAME CONTAINER_NAME DEFAULT_CONFIG_PATH
+  unset USE_CONTAINER WISHED_CONFIG_PATH CONFIG_PATH VOLUME USE_TTY
+}
+
+CDIR="$(cd "$(dirname "$(readlink -f "$0")")" && pwd)"
 CRI=
+INFO=
+IMAGE_NAME=
+CONTAINER_NAME='mail'
+DEFAULT_CONFIG_PATH="$CDIR/config"
+USE_CONTAINER=false
+WISHED_CONFIG_PATH=
+CONFIG_PATH=
+VOLUME=
+USE_TTY=
 
-_check_root() {
+function _check_root()
-  if [[ $EUID -ne 0 ]]; then
+{
+  if [[ $EUID -ne 0 ]]
+  then
     echo "Curently docker-mailserver doesn't support podman's rootless mode, please run this script as root user."
-    exit 1
+    return 1
   fi
 }
 
-if [ -z "$CRI" ]; then
+function _update_config_path()
-  if [ ! -z "$(command -v docker)" ]; then
+{
-    CRI=docker
+  if [[ -n $CONTAINER_NAME ]]
-  elif [ ! -z "$(command -v podman)" ]; then
+  then
-    CRI=podman
+    VOLUME=$(docker inspect "$CONTAINER_NAME" \
-    _check_root
-  else
-    echo "No Support Container Runtime Interface Detected."
-    exit 1
-  fi
-fi
-
-INFO=$($CRI ps \
-  --no-trunc \
-  --format "{{.Image}};{{.Names}}" \
-  --filter label=org.label-schema.name="docker-mailserver" | \
-  tail -1)
-
-IMAGE_NAME=${INFO%;*}
-CONTAINER_NAME=${INFO#*;}
-DEFAULT_CONFIG_PATH="$(pwd)/config"
-USE_CONTAINER=false
-
-_update_config_path() {
-  if [ ! -z "$CONTAINER_NAME" ]; then
-    VOLUME=$(docker inspect $CONTAINER_NAME \
       --format="{{range .Mounts}}{{ println .Source .Destination}}{{end}}" | \
       grep "/tmp/docker-mailserver$" 2>/dev/null)
   fi
 
-  if [ ! -z "$VOLUME" ]; then
+  if [[ -n $VOLUME ]]
-    CONFIG_PATH=$(echo $VOLUME | awk '{print $1}')
+  then
+    CONFIG_PATH=$(echo "$VOLUME" | awk '{print $1}')
   fi
 }
 
-if [ -z "$IMAGE_NAME" ]; then
+function _inspect()
-  if [ "$CRI" = "docker" ]; then
+{
-    IMAGE_NAME=tvial/docker-mailserver:latest
+  if _docker_image_exists "$IMAGE_NAME"
-  elif [ "$CRI" = "podman" ]; then
+  then
-    IMAGE_NAME=docker.io/tvial/docker-mailserver:latest
-  fi
-fi
-
-_inspect() {
-  if _docker_image_exists "$IMAGE_NAME"; then
     echo "Image: $IMAGE_NAME"
   else
     echo "Image: '$IMAGE_NAME' can’t be found."
   fi
-  if [ -n "$CONTAINER_NAME" ]; then
+
+  if [[ -n $CONTAINER_NAME ]]
+  then
     echo "Container: $CONTAINER_NAME"
     echo "Config mount: $CONFIG_PATH"
   else
@@ -70,7 +72,8 @@ _inspect() {
   fi
 }
 
-_usage() {
+function _usage()
+{
   echo "Usage: $0 [-i IMAGE_NAME] [-c CONTAINER_NAME] <subcommand> <subcommand> [args]
 
 OPTIONS:
@@ -121,226 +124,197 @@ SUBCOMMANDS:
     $0 debug inspect
     $0 debug login <commands>
 "
-  exit 1
+
+  return 1
 }
 
-_docker_image_exists() {
+function _docker_image_exists()
-  if ${CRI} history -q "$1" >/dev/null 2>&1; then
+{
+  if $CRI history -q "$1" >/dev/null 2>&1
+  then
     return 0
   else
     return 1
   fi
 }
 
-if tty -s ; then
+function _docker_image()
-  USE_TTY="-ti"
+{
-fi
+  if $USE_CONTAINER
-
+  then
-_docker_image() {
+    # reuse existing container specified on command line
-  if [ "$USE_CONTAINER" = true ]; then
+    $CRI exec "$USE_TTY" "$CONTAINER_NAME" "$@"
-    # Reuse existing container specified on command line
-    ${CRI} exec ${USE_TTY} "$CONTAINER_NAME" "$@"
   else
-    # Start temporary container with specified image
+    # start temporary container with specified image
-    if ! _docker_image_exists "$IMAGE_NAME"; then
+    if ! _docker_image_exists "$IMAGE_NAME"
+    then
       echo "Image '$IMAGE_NAME' not found. Pulling ..."
-      ${CRI} pull "$IMAGE_NAME"
+      $CRI pull "$IMAGE_NAME"
     fi
 
-    ${CRI} run \
+    ${CRI} run --rm \
-      --rm \
       -v "$CONFIG_PATH":/tmp/docker-mailserver \
-      ${USE_TTY} "$IMAGE_NAME" $@
+      "$USE_TTY" "$IMAGE_NAME" "$@"
   fi
 }
 
-_docker_container() {
+function _docker_container()
-  if [ -n "$CONTAINER_NAME" ]; then
+{
-    ${CRI} exec ${USE_TTY} "$CONTAINER_NAME" "$@"
+  if [[ -n $CONTAINER_NAME ]]
+  then
+    $CRI exec "$USE_TTY" "$CONTAINER_NAME" "$@"
   else
     echo "The docker-mailserver is not running!"
     exit 1
   fi
 }
 
-while getopts ":c:i:p:" OPT; do
+function main()
+{
+  if [[ -n $(command -v docker) ]]
+  then
+    CRI=docker
+  elif [[ -n $(command -v podman) ]]
+  then
+    CRI=podman
+    _check_root
+  else
+    echo "No supported Container Runtime Interface detected."
+    exit 1
+  fi
+
+  INFO=$($CRI ps \
+    --no-trunc \
+    --format "{{.Image}};{{.Names}}" \
+    --filter label=org.label-schema.name="docker-mailserver" | \
+    tail -1)
+
+  IMAGE_NAME=${INFO%;*}
+  CONTAINER_NAME=${INFO#*;}
+
+  if [[ -z $IMAGE_NAME ]]
+  then
+    if [[ $CRI == "docker" ]]
+    then
+      IMAGE_NAME=tvial/docker-mailserver:latest
+    elif [[ $CRI == "podman" ]]
+    then
+      IMAGE_NAME=docker.io/tvial/docker-mailserver:latest
+    fi
+  fi
+
+  if tty -s
+  then
+    USE_TTY="-ti"
+  fi
+
+  local OPTIND
+  while getopts ":c:i:p:" OPT
+  do
     case $OPT in
-    c)
+      c) CONTAINER_NAME="$OPTARG" ; USE_CONTAINER=true ;; # container specified, connect to running instance
-      CONTAINER_NAME="$OPTARG"
+      i) IMAGE_NAME="$OPTARG" ;;
-      USE_CONTAINER=true # Container specified, connect to running instance
-      ;;
-    i)
-      IMAGE_NAME="$OPTARG"
-      ;;
       p)
         case "$OPTARG" in
-      /*)
+          /*) WISHED_CONFIG_PATH="$OPTARG" ;;
-          WISHED_CONFIG_PATH="$OPTARG"
+          * ) WISHED_CONFIG_PATH="$CDIR/$OPTARG" ;;
-          ;;
-      *)
-          WISHED_CONFIG_PATH="$(pwd)/$OPTARG"
-          ;;
         esac
-      if [ ! -d "$WISHED_CONFIG_PATH" ]; then
+
+        if [[ ! -d $WISHED_CONFIG_PATH ]]
+        then
           echo "Directory doesn't exist"
           _usage
           exit 1
         fi
         ;;
-   \?)
+     *) echo "Invalid option: -$OPTARG" >&2 ;;
-     echo "Invalid option: -$OPTARG" >&2
-     ;;
     esac
   done
+  shift $((OPTIND-1))
 
-if [ ! -n "$WISHED_CONFIG_PATH" ]; then
+  if [[ -z $WISHED_CONFIG_PATH ]]
+  then
     # no wished config path
     _update_config_path
 
-  if [ ! -n "$CONFIG_PATH" ]; then
+    if [[ -z $CONFIG_PATH ]]
+    then
       CONFIG_PATH=$DEFAULT_CONFIG_PATH
     fi
   else
     CONFIG_PATH=$WISHED_CONFIG_PATH
   fi
 
-shift $((OPTIND-1))
 
-case $1 in
+  case ${1:-} in
 
     email)
-    shift
+      shift ; case ${1:-} in
-    case $1 in
+        add      ) shift ; _docker_image addmailuser "$@" ;;
-      add)
+        update   ) shift ; _docker_image updatemailuser "$@" ;;
-        shift
+        del      ) shift ; _docker_image delmailuser "$@" ;;
-        _docker_image addmailuser $@
+        restrict ) shift ; _docker_container restrict-access "$@" ;;
-        ;;
+        list     ) _docker_image listmailuser ;;
-      update)
+        *        ) _usage ;;
-        shift
-        _docker_image updatemailuser $@
-        ;;
-      del)
-        shift
-        _docker_image delmailuser $@
-        ;;
-      restrict)
-        shift
-        _docker_container restrict-access $@
-        ;;
-      list)
-        _docker_image listmailuser
-        ;;
-      *)
-        _usage
-        ;;
       esac
       ;;
 
     alias)
-    shift
+      shift ; case ${1:-} in
-    case $1 in
+        add      ) shift ; _docker_image addalias "$@" ;;
-        add)
+        del      ) shift ; _docker_image delalias "$@" ;;
-          shift
+        list     ) shift ; _docker_image listalias "$@" ;;
-          _docker_image addalias $@
+        *        ) _usage ;;
-          ;;
-        del)
-          shift
-          _docker_image delalias $@
-          ;;
-        list)
-          shift
-          _docker_image listalias $@
-          ;;
-        *)
-          _usage
-          ;;
       esac
       ;;
 
     quota)
-    shift
+      shift ; case ${1:-} in
-    case $1 in
+        set      ) shift ; _docker_image setquota "$@" ;;
-        set)
+        del      ) shift ; _docker_image delquota "$@" ;;
-          shift
+        *        )   _usage ;;
-          _docker_image setquota $@
-          ;;
-        del)
-          shift
-          _docker_image delquota $@
-          ;;
-        *)
-          _usage
-          ;;
       esac
       ;;
 
     config)
-    shift
+      shift ; case ${1:-} in
-    case $1 in
+        dkim     ) _docker_image generate-dkim-config "${2:-2048}" ;;
-      dkim)
+        ssl      ) _docker_image generate-ssl-certificate "$2" ;;
-        _docker_image generate-dkim-config $2
+        *        ) _usage ;;
-        ;;
-      ssl)
-        _docker_image generate-ssl-certificate "$2"
-        ;;
-      *)
-        _usage
-        ;;
       esac
       ;;
 
     relay)
-    shift
+      shift ; case ${1:-} in
-    case $1 in
+        add-domain     ) shift ; _docker_image addrelayhost "$@" ;;
-      add-domain)
+        add-auth       ) shift ; _docker_image addsaslpassword "$@" ;;
-        shift
+        exclude-domain ) shift ; _docker_image excluderelaydomain "$@" ;;
-        _docker_image addrelayhost $@
+        *              ) _usage ;;
-        ;;
-      add-auth)
-        shift
-        _docker_image addsaslpassword $@
-        ;;
-      exclude-domain)
-        shift
-        _docker_image excluderelaydomain $@
-        ;;
-      *)
-        _usage
-        ;;
       esac
       ;;
 
     debug)
-    shift
+      shift ; case ${1:-} in
-    case $1 in
+        fetchmail      ) _docker_image debug-fetchmail ;;
-      fetchmail)
+        fail2ban       ) shift ; _docker_container fail2ban "$@" ;;
-        _docker_image debug-fetchmail
+        show-mail-logs ) _docker_container cat /var/log/mail/mail.log ;;
-        ;;
+        inspect        ) _inspect ;;
-      fail2ban)
-        shift
-        _docker_container fail2ban $@
-        ;;
-      show-mail-logs)
-        _docker_container cat /var/log/mail/mail.log
-        ;;
-      inspect)
-        _inspect
-        ;;
         login          )
           shift
-        if [ -z "$1" ]; then
+          if [[ -z ${1:-''} ]]
+          then
             _docker_container /bin/bash
           else
             _docker_container /bin/bash -c "$@"
           fi
           ;;
-      *)
+        *        ) _usage ;;
-        _usage
-        ;;
       esac
       ;;
 
-  *)
+    *            ) _usage ;;
-    _usage
-    ;;
   esac
+}
+
+main "$@"
+_unset_vars