add trap protection, and option to force remplacement

profile.d/debug.sh

@@ -46,7 +46,7 @@ function backtrace()
             "${FUNCNAME[$i]}" "${BASH_SOURCE[$i]}" "${BASH_LINENO[$(( i-1 ))]}"
         ((i++))
     done
-    unset func i
+    unset i
     printf "==============================\n"
 }
 
@@ -69,30 +69,37 @@ settrace()
     #trap -p ERR
 
     local PARSED
-    PARSED=$(getopt -oh --long help,on,off,status -- "$@")
+    PARSED=$(getopt -oh --long help,on,off,status,force -- "$@")
     if [[ $? -ne 0 ]]; then
         disp E "Invalid options, use \"settrace --help\" to display usage."
         return 1
     fi
     eval set -- "$PARSED"
+    local force=0
     while true; do
         case $1 in
         -h|--help)
             printf "Try to activate backtrace display for script debugging.\n\n"
             printf "Options:\n"
             printf "\t--on\t\tActivate backtrace generation\n"
+            printf "\t--force\t\tForce replacement of existing trap (use with --on)\n"
             printf "\t--off\t\tDeactivate backtrace generation\n\n"
             printf "That function active a trap event on error. If the script you want to\n"
             printf "debug overload the ERR bash trap, it will not work.\n"
             return 0
             ;;
         --on)
-            if [[ ${status} == "on" ]]; then
-                disp W "ERR signal trap is already set, replacing previous trap!"
+            if [[ ${status} == "on" ]] && [[ $force -eq 0 ]]; then
+                disp E "ERR signal trap is already set. Use --force to replace it."
+                return 1
             fi
             trap "error" ERR
             shift
             ;;
+        --force)
+            force=1
+            shift
+            ;;
         --off)
             if [[ ${status} != "on" ]]; then
                 disp W "ERR signal trap is already unset!"
@@ -101,7 +108,7 @@ settrace()
             shift
             ;;
         --status)
-            disp "ERR trap signal is ${status}."
+            disp i "Trap signal is ${status}."
             shift
             ;;
         --)
@@ -114,7 +121,7 @@ settrace()
             ;; 
         esac
     done
-    unset status
+    unset status force
 }
 export -f settrace
 # ------------------------------------------------------------------------------