Add bash trap article

content/articles/2022/bash_les_pieges/files/troisieme_script.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+server="192.168.0.254 -i ~/.ssh/rick.epha.se.ed25519"
+user="ephase"
+
+# Reutilisons ce que nous avons créé lors du précédent article
+source ./message.sh
+
+ssh_sock="/tmp/$(mktemp -u XXXXXXXXXX)"
+
+connect() {
+    msg "Create SSH main connection wih socket ${ssh_sock}"
+    ssh -N -o ControlMaster=yes -o ControlPath="$ssh_sock" -f ${user}@${server} || {
+        error "Can't connect to $server";
+        exit 20;
+    }
+}
+
+launch_command() {
+    if [ -z "$1" ]
+    then
+        error "Launch command require 1 parameter"
+        exit 31
+    fi
+    local command
+    command="$1"
+    ssh -q -t -S "$ssh_sock" ${user}@${server} "$command" || {
+        error "";
+        exit 30;
+    }
+}
+
+cleanup() {
+    # close the master control connexion before
+    msg "Close SSH main connection"
+    ssh -q -o ControlPath="$ssh_sock" -O exit $server || {
+        error "Can't close SSH master connection, $ssh_sock remain";
+    }
+}
+
+process_int() {
+    error "Script interrupted by user (SIGINT)"
+    exit 255
+}
+
+check_conn() {
+    msg "Check connection on ${server}"
+    ssh -S "$ssh_sock" -O check $server
+    sleep 20
+}
+
+msg "Current PID: $$"
+connect
+trap cleanup EXIT
+trap process_int INT
+trap check_conn USR1
+
+if [ "$1" = "error" ]
+then
+    launch_command
+fi
+for (( i=1; i<=20; i++ ))
+do
+    launch_command "echo 'Message N°$i from $server'"
+    sleep 2
+done