Print diff after edit

Signed-off-by: Georg <georg@lysergic.dev>

scripts/sh/pf.sh

@@ -3,11 +3,15 @@
 # Helps you edit a production packet filter configuration and reduces the risk of doing something really bad.
 # 
 # Author: Georg Pfuetzenreuter <georg@lysergic.dev>
-# Last edit: 02/11/2021
+# Created: 02/11/2021
+# Last edit: 05/12/2021
+# Version: 2.0
 #
 # This assumes .ssh/config being configured to ssh into your router with a user having write access to /tmp/* and $prodfile as well as having doas permissions for `pfctl -f $prodfile`.
 
-editor="$(which vim)"
+editor="$(which nvim)"
+difftool="/home/lysergic/lysergic-venv/bin/icdiff"
+diffargs=( -L "CURRENT CONFIGURATION" -L "YOUR CONFIGURATION" -N -U2 )
 prodfile="/etc/pf.conf"
 backupfile="/tmp/pf.conf.bak-$(date -u +%d%m%y-%H%M)"
 stagefile="/tmp/pf.conf-work-$USER-$(date -u +%d%m%y-%H%M)"
@@ -17,11 +21,14 @@ gethostaddress () {
 }
 
 init () {
-        hostaddress=$(gethostaddress)
-        if nc -nz $hostaddress 22 2>/dev/null; then
+        #hostaddress=$(gethostaddress) ##we no longer parse ssh_config and rely on functioning DNS lookups
+        hostaddress="$host"
+        if nc -z $hostaddress 22 2>/dev/null; then
                 workfile="/tmp/pf.conf.$host-$USER-$(date -u +%d%m%y-%H%M)"
                 ssh -q $host cp $prodfile $backupfile
                 scp -q $host:$prodfile $workfile
+                localbackupfile="${workfile}_original"
+                cp $workfile $localbackupfile
                 edit
         else
                 echo "Host not reachable."
@@ -54,7 +61,12 @@ check () {
         esac
 }
 
+render_diff () {
+        $difftool "${diffargs[@]}" $localbackupfile $workfile
+}
+
 edit_ok () {
+        render_diff
         echo "Syntax OK. Type YES to deploy changes or anything else to abort."
         read choice
         if [ "$choice" = "YES" ]; then
@@ -105,9 +117,8 @@ deploy () {
         result="$?"
         case $result in
                 0 )
-                ssh -q $host doas pfctl -f $prodfile
+                ssh -q $host "doas pfctl -f $prodfile && rm $stagefile"
                 echo "OK."
-                ssh -q $host rm $stagefile
                 rm $workfile
                 ;;
                 1 )