auto-restart.sh - Enable Email Alerts (#984)

Adds email alert functionality to auto-restart.sh

Emails are disabled by default so if a user does not want emails, nothing changes. They can copy the file into their working directory normally and they are done. 

If they want email alerts every time Trunk-Recorder crashes/fails to restart, those can be enabled and configured as needed. 

Sleep time has been updated to 120 by default to reduce alerts/spam

examples/auto-restart.sh

@@ -1,6 +1,99 @@
 #!/bin/bash
 
-until ./trunk-recorder; do
-    echo "Server 'myserver' crashed with exit code $?.  Respawning.." >&2
-    sleep 5
+##############################CONFIGURATION##############################
+enable_email_alerts="false" #Choose whether to enable email alerts when Trunk-Recorder Crashes ("true" or "false") 
+email_address="" #Email address alerts should be sent to (if enabled)
+
+# Email alerts are disabled by default. If you don't want to use them, no further action is needed.
+# If email alerts are enabled, make sure to configure your system's email service (e.g., Mutt, Mail, Postfix, Sendmail, or an SMTP relay service like Gmail).
+# This script uses "mutt" email service by default. Adjust accordingly if you use another service.
+# If emails are enabled, I recommend increasing the 'sleep' time (line 98). This will send an alert every time trunk-recorder fails to restart. (If set to 120 seconds, you could get an email every 2 minutes)
+##############################CONFIGURATION##############################
+
+##START OF SCRIPT##
+
+# Get the directory of the current script (used for locating your config)
+script_dir="$(cd "$(dirname "$0")" && pwd)"
+
+# Path to the config.json file
+config_file="$script_dir/config.json"
+
+# Function to parse JSON and extract a value for a given key
+get_json_value() {
+    local key=$1
+    jq -r ".$key // empty" "$config_file"
+}
+
+# Parse the config.json file
+if [[ -f "$config_file" ]]; then
+    log_file_enabled=$(get_json_value "logFile")
+    log_dir=$(get_json_value "logDir")
+else
+    log_file_enabled="false"
+fi
+
+# Determine the log directory (used to attach the most recent log file when TR crashes)
+if [[ "$log_file_enabled" == "true" ]]; then
+    if [[ -n "$log_dir" ]]; then
+        # Use the specified logDir location
+        log_path="$log_dir"
+    else
+        # Use the default /logs directory within the script's directory
+        log_path="$script_dir/logs"
+    fi
+else
+    log_path=""
+fi
+
+# Infinite loop to keep the script running
+while true; do
+    # Run trunk-recorder
+    ./trunk-recorder
+
+    # Capture the exit code
+    exit_code=$?
+
+    # Log the crash information to the console
+    echo "Trunk-Recorder crashed with exit code $exit_code. Respawning.." >&2
+
+    # Check if emails are enabled
+    if [[ "$enable_email_alerts" == "true" ]]; then
+        # Check if logs are enabled
+        if [[ "$log_file_enabled" == "true" && -n "$log_path" ]]; then
+            # Find the most recent log file in the log directory
+            recent_log=$(ls -t "$log_path" 2>/dev/null | head -n 1)
+            recent_log_path="$log_path/$recent_log"
+
+            # Check if the most recent log file exists
+            if [[ -f "$recent_log_path" ]]; then
+                # Convert the log file to a plain text file
+                converted_log="${recent_log_path}.txt"
+                cp "$recent_log_path" "$converted_log"
+
+                # Get the last 10 lines of the log file
+                last_lines=$(tail -n 10 "$recent_log_path")
+
+                # Send an email with the text file attached and the last 10 lines in the body using mutt
+                echo -e "Trunk-Recorder crashed!\n\nExit Code: $exit_code.\n\nLast 10 log entries:\n$last_lines" | \
+                mutt -e "set content_type=text/plain" -s "Trunk-Recorder crashed!" -a "$converted_log" -- "$email_address"
+
+                # Clean up the temporary text file
+                rm -f "$converted_log"
+            else
+                # If no log file exists, send an email without an attachment using mutt
+                echo -e "Trunk-Recorder crashed!.\n\nExit Code: $exit_code.\n\n No logs attached (No logs found!)" | \
+                mutt -e "set content_type=text/plain" -s "Trunk-Recorder crashed!" -- "$email_address"
+            fi
+        else
+            # Logs are not enabled, send an email without an attachment using mutt
+            echo -e "Trunk-Recorder crashed!.\n\nExit Code: $exit_code.\n\n No logs available to attach (logging is disabled)" | \
+            mutt -e "set content_type=text/plain" -s "Trunk-Recorder crashed!" -- "$email_address"
+        fi
+    else
+        # Emails are disabled, just log to console and try to restart
+        echo "Trunk-Recorder crashed with exit code $exit_code. Respawning without sending an email."
+    fi
+
+    # Wait for the configured duration before restarting the program
+    sleep 120
 done