Update v-change-sys-hostname (#4030)

Update v-change-sys-hostname to replace current hostname in /etc/hosts instead of just add it

bin/v-change-sys-hostname

@@ -35,37 +35,60 @@ check_hestia_demo_mode
 #                       Action                             #
 #----------------------------------------------------------#
 
-hostname "$domain"
+current_hostname="$(hostname)"
+if [[ "$current_hostname" == "$domain" ]]; then
+        echo "Current hostname \"$current_hostname\" is the same as the new one you want to use"
+        echo "I'm not going to change it"
+        exit
+fi
 
+hostname "$domain"
 if [ -d "/etc/sysconfig" ]; then
-	# RHEL/CentOS/Amazon
-	touch /etc/sysconfig/network
-	if [ -z "$(grep HOSTNAME /etc/sysconfig/network)" ]; then
-		echo "HOSTNAME='$domain'" >> /etc/sysconfig/network
-	else
-		sed -i "s/HOSTNAME=.*/HOSTNAME='$domain'/" /etc/sysconfig/network
-	fi
+        # RHEL/CentOS/Amazon
+        touch /etc/sysconfig/network
+        if [ -z "$(grep HOSTNAME /etc/sysconfig/network)" ]; then
+                echo "HOSTNAME='$domain'" >>/etc/sysconfig/network
+        else
+                sed -i "s/HOSTNAME=.*/HOSTNAME='$domain'/" /etc/sysconfig/network
+        fi
 else
-	# Debian/Ubuntu
-	hostnamectl set-hostname "$domain"
-	echo "$domain" > /etc/hostname
+        # Debian/Ubuntu
+        hostnamectl set-hostname "$domain"
+        echo "$domain" >/etc/hostname
 fi
 
-# Update Roundcube password plugin configuration
+# Update webmail's password plugin configuration
 if [ -d /etc/roundcube/ ]; then
-	sed -i "/password_hestia_host/c\$rcmail_config['password_hestia_host'] = '$domain';" /etc/roundcube/plugins/password/config.inc.php
+        sed -i "/password_hestia_host/c\$rcmail_config['password_hestia_host'] = '$domain';" /etc/roundcube/plugins/password/config.inc.php
 fi
 if [ -d /etc/rainloop/ ]; then
-	sed -i "/hestia_host/c\hestia_host = \"$domain\"" /etc/rainloop/data/_data_/_default_/configs/plugin-hestia-change-password.ini
+        sed -i "/hestia_host/c\hestia_host = \"$domain\"" /etc/rainloop/data/_data_/_default_/configs/plugin-hestia-change-password.ini
 fi
 if [ -d /etc/snappymail/ ]; then
-	sed -i "/\"hestia_host\":/c\\\"hestia_host\": \"$domain\"," /etc/snappymail/data/_data_/_default_/configs/plugin-change-password.json
+        sed -i "/\"hestia_host\":/c\\\"hestia_host\": \"$domain\"," /etc/snappymail/data/_data_/_default_/configs/plugin-change-password.json
 fi
 
+# Update /etc/hosts
 if [ -f /etc/hosts ]; then
-	if ! cat /etc/hosts | grep $domain > /dev/null; then
-		echo "127.0.0.1 $domain" >> /etc/hosts
-	fi
+        if grep -q -E "^127\.0\.0\.1\s{1,}${current_hostname}$" /etc/hosts; then
+                sed -i -E "s/127\.0\.0\.1\s{1,}${current_hostname}/127\.0\.0\.1 ${domain}/" /etc/hosts
+        else
+                echo "127.0.0.1 $domain" >>/etc/hosts
+        fi
+        # Check whether hostname entries are duplicated and remove all but the last one
+        ndup_hosts="$(grep -c -E "^127\.0\.0\.1\s{1,}${domain}$" /etc/hosts)"
+        if [[ "${ndup_hosts}" -gt "1" ]]; then
+                nlines_to_del="$((ndup_hosts - 1))"
+                lines_to_del="$(grep -n -E "^127\.0\.0\.1\s{1,}${domain}$" /etc/hosts | head -n${nlines_to_del} | awk -F ':' '{print $1}')"
+                for i in $lines_to_del; do
+                        if [[ -z $list_lines ]]; then
+                                list_lines="${i}d"
+                        else
+                                list_lines+=";${i}d"
+                        fi
+                done
+                sed -i "${list_lines}" /etc/hosts
+        fi
 fi
 
 #----------------------------------------------------------#