install_postfix_base.sh: add default values if configuration file is not present or some values not set.

install_postfix_base.sh

@@ -1,27 +1,15 @@
 #!/usr/bin/env bash
 
+script_dir="$(dirname $(realpath $0))"
+script_name="$(basename "$0")"
+
+conf_dir=$(dirname $0)/conf
+conf_file="${conf_dir}/install_postfix_base.conf"
+
 _TLS_CERT_DIR=/etc/postfix/ssl
 _TLS_CERT_FILE="${_TLS_CERT_DIR}/mailserver.crt"
 _TLS_KEY_FILE="${_TLS_CERT_DIR}/mailserver.key"
-#
 _TLS_CA_FILE=/etc/ssl/certs/ca-certificates.crt
-#
-#
-#_HOSTNAME=o15.oopen.de
-#_IPV4=83.223.86.96
-#_EXT_IF_IP=83.223.86.96
-#
-### - Leave empty, if no IPv6 should be supported
-### -
-#_IPV6=2a01:30:0:13:5054:ff:fe09:2318
-##_IPV6=
-#
-#_ADMIN_EMAIL=admin@oopen.de
-#
-#_SASL_AUTH=false
-#_RELAY_HOST=b.mx.oopen.de
-#_SASL_USER=anw-urb
-#_SASL_PASS='OhPie2aethei'
 
 
 # -------------
@@ -81,6 +69,15 @@ echo_skipped() {
 }
 
 
+# -------------
+# --- Some default settings
+# -------------
+
+DEFAULT_ADMIN_EMAIL="argus@oopen.de"
+DEFAULT_RELAY_HOST="b.mx.oopen.de"
+DEFAULT_SASL_AUTH=false
+
+
 # - Is this a systemd system?
 # -
 if [[ "X`which systemd`" = "X" ]]; then
@@ -91,13 +88,27 @@ fi
 
 echo ""
 
-conf_dir=$(dirname $0)/conf
+# - Read Configuration File if exists
-conf_file="${conf_dir}/install_postfix_base.conf"
+# -
-
 if [[ -f "$conf_file" ]]; then
    source $conf_file
 fi
 
+
+# -------------
+# --- Set default values for some non existent variables (i.e. no configuration file is present)
+# -------------
+
+[[ -z "$_ADMIN_EMAIL" ]] && _ADMIN_EMAIL="$DEFAULT_ADMIN_EMAIL"
+[[ -z "$_SASL_AUTH" ]] && _SASL_AUTH="$DEFAULT_SASL_AUTH"
+
+if [[ -z "$_HOSTNAME" ]] ; then
+   _HOSTNAME="$(hostname -f)"
+   _HOSTNAME_SHORT="$(hostname)"
+   [[ "$_HOSTNAME" = "$_HOSTNAME_SHORT" ]] && _HOSTNAME=""
+fi
+
+
 clear
 echo -e "\033[21G\033[32mInstallation script for Postfix basic mailsystem \033[m"
 echo
@@ -124,6 +135,24 @@ else
    done
 fi
 
+
+# -------------
+# --- Some further default values depending on Hostname
+# -------------
+
+# - Set default values for ipv4- and ipv6-address
+# -
+if [[ -z $_IPV4 ]] && [[ -n "$_HOSTNAME" ]] && [[ -x "$(which dig)" ]]; then
+   _IPV4="$(dig +short "$_HOSTNAME" A)"
+fi
+if [[ -z $_IPV6 ]] && [[ -n "$_HOSTNAME" ]] && [[ -x "$(which dig)" ]]; then
+   _IPV6="$(dig +short "$_HOSTNAME" AAAA)"
+fi
+if [[ -z $_IPV6 ]]; then
+	_IPV6=None
+fi
+
+
 IPV4=
 echo ""
 echo -e "\033[32m--\033[m"
@@ -239,6 +268,21 @@ else
       fi
    done
 fi
+
+
+# -------------
+# --- Some further default values depending on sasl authentification
+# -------------
+
+# - Set default value for relay host if sasl authentification should be
+# - supported and value for _RELAY_HOST not given
+# -
+if [[ "$SASL_AUTH" = "yes" ]] || $SASL_AUTH ; then
+   [[ -z "$_RELAY_HOST" ]] && _RELAY_HOST="$DEFAULT_RELAY_HOST"
+fi
+
+
+
 if [[ "$SASL_AUTH" = "yes" ]] || $SASL_AUTH ; then
    SASL_AUTH=true