feat: make gotify optional (#16)

Reviewed-on: #16
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

src/backup.sh

@@ -1,6 +1,20 @@
 #!/bin/bash
 set -euo pipefail
 
+#######################################
+# Date format for logging.
+#######################################
+LOG_DATE_FORMAT="%Y-%m-%dT%T"
+
+#######################################
+# Log a message with a timestamp.
+# Arguments:
+#   Message to log.
+#######################################
+log() {
+    echo "$(date +"$LOG_DATE_FORMAT") - $*"
+}
+
 #######################################
 # Determine backup mode from the environment only.
 # Valid values: "directory" or "postgres".
@@ -18,7 +32,7 @@ fi
 
 for cmd in "${REQUIRED_CMDS[@]}"; do
     if ! command -v "$cmd" &>/dev/null; then
-        echo "Error: Required command '$cmd' is not installed." >&2
+        log "Error: Required command '$cmd' is not installed."
         exit 1
     fi
 done
@@ -26,10 +40,17 @@ done
 #######################################
 # Validate common required environment variables.
 #######################################
-# Gotify notification settings.
-: "${GOTIFYHOST:?Environment variable GOTIFYHOST is not set}"
-: "${GOTIFYTOKEN:?Environment variable GOTIFYTOKEN is not set}"
-: "${GOTIFYTOPIC:?Environment variable GOTIFYTOPIC is not set}"
+# Gotify notification settings (optional).
+# Set ENABLE_GOTIFY to "true" to enable notifications, any other value or unset disables them.
+ENABLE_GOTIFY="${ENABLE_GOTIFY:-true}"
+
+if [ "$ENABLE_GOTIFY" = "true" ]; then
+    : "${GOTIFYHOST:?Environment variable GOTIFYHOST is not set (required when ENABLE_GOTIFY=true)}"
+    : "${GOTIFYTOKEN:?Environment variable GOTIFYTOKEN is not set (required when ENABLE_GOTIFY=true)}"
+    : "${GOTIFYTOPIC:?Environment variable GOTIFYTOPIC is not set (required when ENABLE_GOTIFY=true)}"
+else
+    log "Gotify notifications disabled. Backup status will be logged to console only."
+fi
 
 # Restic encryption password.
 : "${RESTIC_PASSWORD:?Environment variable RESTIC_PASSWORD is not set}"
@@ -62,23 +83,11 @@ case "$BACKUP_MODE" in
 esac
 
 #######################################
-# Build the Gotify URL.
+# Build the Gotify URL (only if Gotify is enabled).
 #######################################
-GOTIFYURL="${GOTIFYHOST}/message?token=${GOTIFYTOKEN}"
-
-#######################################
-# Date format for logging.
-#######################################
-LOG_DATE_FORMAT="%Y-%m-%dT%T"
-
-#######################################
-# Log a message with a timestamp.
-# Arguments:
-#   Message to log.
-#######################################
-log() {
-    echo "$(date +"$LOG_DATE_FORMAT") - $*"
-}
+if [ "$ENABLE_GOTIFY" = "true" ]; then
+    GOTIFYURL="${GOTIFYHOST}/message?token=${GOTIFYTOKEN}"
+fi
 
 #######################################
 # Send a notification via Gotify.
@@ -87,6 +96,13 @@ log() {
 #######################################
 send_notification() {
     local message="$1"
+    
+    # Only send notification if Gotify is enabled
+    if [ "$ENABLE_GOTIFY" != "true" ]; then
+        log "$message"
+        return 0
+    fi
+    
     if ! curl -s -X POST "$GOTIFYURL" -F "title=${GOTIFYTOPIC}" -F "message=${message}" >/dev/null; then
         log "Warning: Failed to send notification with message: ${message}"
     fi