Add dry_run flag

1 files changed, 13 insertions, 3 deletions

@@ -9,10 +9,11 @@ usage()
 {
         cat <<-END
         mrgrctrnl: make magic ssh tunnels
-        usage: mrgrctrnl [-h] [-c CONF]
+        usage: mrgrctrnl [-h] [-c CONF] [-d]
 
         -h              show this help
         -c CONF use config file CONF.
+        -d              do a dry run: don't actually tunnel
         .               default: \$XDG_CONFIG_HOME/mrgrctrnl/config
 
         END
@@ -32,11 +33,13 @@ die()
 
 config="${XDG_CONFIG_HOME:=$HOME/.config}/mrgrctrnl/config"
 pidf=/tmp/mrgrctrnl.pid
+dry_run=false;
 
-while getopts hc: opt; do
+while getopts hc:d opt; do
         case "$opt" in
                 h) usage ;;
                 c) config="$OPTARG" ;;
+                d) dry_run=true ;;
                 \?) usage 2 ;;
                 *) usage 2 ;;
         esac
@@ -44,7 +47,7 @@ done
 shift "$((OPTIND - 1))"
 
 [ -f "$config" ] || die "Need a config! Edit $config"
-[ -e "$pidf" ] && {
+[ -e "$pidf" ] && ! "$dry_run" && {
         while read -r pid; do
                 kill "$pid"
         done < "$pidf"
@@ -54,6 +57,13 @@ shift "$((OPTIND - 1))"
 awk '{sub(/#.*$/,"");print}' "$config" |
 while read -r machine user local remote
 do
+        [ -z "$machine" ] || [ -z "$user" ] || 
+        [ -z "$local" ] || [ -z "$remote" ] &&
+        continue
+
+        echo ssh -N "$user@$machine" -L "$local:$remote"
+
+        $dry_run || 
         while :
         do
                 ssh -N "$user@$machine" -L "$local:$remote"