From 1c4555e410a8f1dc0daeeeeb3b1cd9f84915ff5a Mon Sep 17 00:00:00 2001
From: Christoph <ckubu@oopen.de>
Date: Tue, 2 Jan 2018 10:43:49 +0100
Subject: [PATCH] Prevent installation to overwrithe existing postfix files. At
 least make a backup.

---
 install_postfix_advanced.sh | 47 +++++++++++++++++++++++++++++++++----
 1 file changed, 42 insertions(+), 5 deletions(-)

diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 699ca52..6597710 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -1059,6 +1059,20 @@ fi
 
 ## - /etc/aliases
 ## -
+
+echononl "   Backup existing file '/etc/aliases'"
+if [[ -f /etc/aliases ]] ; then
+   mv /etc/aliases "/etc/aliases.$backup_date" > $tmp_err_msg  2>&1
+	if [[ $? -eq 0 ]] ; then
+		echo_ok
+	else
+		echo_failed
+		error "$(cat $tmp_err_msg)"
+	fi
+else
+	echo_skipped
+fi
+
 echononl "   Adjust \"/etc/aliases\""
 cat << EOF > /etc/aliases
 # See man 5 aliases for format
@@ -1175,11 +1189,13 @@ fi
 ## - create files
 ## -
 echononl "   Create file \"access_recipient-rfc\""
-cat <<EOF > /etc/postfix/access_recipient-rfc
+if [[ ! -f /etc/postfix/access_recipient-rfc ]]; then
+	cat <<EOF > /etc/postfix/access_recipient-rfc
 # if destination is ok, permit
 /^postmaster\@/   permit_auth_destination
 /^abuse\@/        permit_auth_destination
 EOF
+fi
 postmap btree:/etc/postfix/access_recipient-rfc
 if [[ $? -eq 0 ]] ; then
    echo_ok
@@ -1197,11 +1213,13 @@ fi
 ## -    backup_anw-urban@oopen.de OK
 ## -    anonymous@bbb-server.b3-bornim.de OK
 echononl "   Create file \"access_sender\""
-cat <<EOF > /etc/postfix/access_sender
+if [[ ! -f /etc/postfix/access_sender ]]; then
+	cat <<EOF > /etc/postfix/access_sender
 # - bekannte Virus/Spam Absener blocken
 # -
 error@mailfrom.com   REJECT
 EOF
+fi
 postmap btree:/etc/postfix/access_sender
 if [[ $? -eq 0 ]] ; then
    echo_ok
@@ -1210,7 +1228,9 @@ else
 fi
 
 echononl "   Create file \"access_recipient\""
-echo > /etc/postfix/access_recipient
+if [[ ! -f /etc/postfix/access_recipient ]]; then
+	touch /etc/postfix/access_recipient
+fi
 postmap btree:/etc/postfix/access_recipient
 if [[ $? -eq 0 ]] ; then
    echo_ok
@@ -1219,7 +1239,8 @@ else
 fi
 
 echononl "   Create file \"transport\""
-cat <<EOF > /etc/postfix/transport
+if [[ ! -f /etc/postfix/transport ]]; then
+	cat <<EOF > /etc/postfix/transport
 # - Force sending through IPv4
 # -
 # - Take care your master.cf file (/etc/postfix/master.cf) contains:
@@ -1239,6 +1260,7 @@ cat <<EOF > /etc/postfix/transport
 #example.net   smtp-ipv6-only:
 
 EOF
+fi
 postmap btree:/etc/postfix/transport
 if [[ $? -eq 0 ]] ; then
    echo_ok
@@ -1246,8 +1268,11 @@ else
    echo_failed
 fi
 
+
 echononl "   Create file \"relay_domains\""
-echo > /etc/postfix/relay_domains
+if [[ ! -f /etc/postfix/relay_domains ]] ; then
+   touch /etc/postfix/relay_domains
+fi
 postmap btree:/etc/postfix/relay_domains
 if [[ $? -eq 0 ]] ; then
    echo_ok
@@ -1320,6 +1345,18 @@ else
          echo_skipped
       fi
 
+		echononl "   Backup existing file '/etc/postfix/sasl/smtpd.conf'"
+		if [[ -f /etc/postfix/sasl/smtpd.conf ]] ; then
+			mv /etc/postfix/sasl/smtpd.conf "/etc/postfix/sasl/smtpd.conf.$backup_date" > $tmp_err_msg 2>&1
+         if [[ $? -eq 0 ]] ; then
+            echo_ok
+         else
+            echo_failed
+				error "$(cat $tmp_err_msg)"
+         fi
+		else
+			echo_skipped
+		fi
       echononl "   Create file '/etc/postfix/sasl/smtpd.conf'.."
       cat <<EOF > /etc/postfix/sasl/smtpd.conf
 # - Take care only using provided login mechanisms. You can check this, by