Added backup path-name generation.

openwrt_backup/utils.py

@@ -1,3 +1,4 @@
+import datetime
 from pathlib import Path
 from subprocess import list2cmdline
 from typing import Union
@@ -52,3 +53,21 @@ def exec_remote(client: paramiko.SSHClient, command: Union[str, list]):
         command = list2cmdline(command)
     stdin, stdout, stderr = client.exec_command(command)
     return stdout, stderr
+
+
+def get_next_number(backup_path: Path, hostname):
+    f_names = (path.name for path in backup_path.glob("*.tar.gz"))
+    f_names_fields = map(lambda s: s.split("__"), f_names)
+    f_names_fields_filtered = filter(
+        lambda fields: fields[1] == hostname, f_names_fields
+    )
+    try:
+        return max(int(fields[0]) for fields in f_names_fields_filtered) + 1
+    except ValueError:
+        return 0
+
+
+def get_new_backup_filepath(backup_path: Path, time_format, hostname):
+    next_number = get_next_number(backup_path, hostname)
+    dt = datetime.datetime.today()
+    return backup_path / f"{next_number}__{hostname}__{dt.strftime(time_format)}.tar.gz"