v2.5.0: make backup names collision safe

lib/backup.sh

@@ -7,10 +7,24 @@ create_backup() {
     local output_dir="${2:-$BACKUP_DIR}"
     local timestamp
     timestamp=$(date +%Y%m%d_%H%M%S)
-    local backup_name="gotelegram_backup_${timestamp}"
-    local tmp_dir="/tmp/${backup_name}"
+    local backup_name tmp_dir suffix=0
 
-    mkdir -p "$tmp_dir" "$output_dir"
+    mkdir -p "$output_dir"
+    while true; do
+        if [ "$suffix" -eq 0 ]; then
+            backup_name="gotelegram_backup_${timestamp}"
+        else
+            backup_name="gotelegram_backup_${timestamp}_${suffix}"
+        fi
+        tmp_dir="/tmp/${backup_name}"
+        if [ ! -e "$tmp_dir" ] && \
+           [ ! -e "${output_dir}/${backup_name}.tar.gz" ] && \
+           [ ! -e "${output_dir}/${backup_name}.tar.gz.enc" ]; then
+            break
+        fi
+        suffix=$((suffix + 1))
+    done
+    mkdir -p "$tmp_dir"
 
     # Собираем файлы
     log_info "$(_t_or backup_collecting 'Собираю конфигурацию...')"