feature(backups): copy cli logic to new restic backuper

selfprivacy_api/backup/restic_backuper.py

@@ -2,5 +2,27 @@ from selfprivacy_api.backup import AbstractBackuper
 
 
 class ResticBackuper(AbstractBackuper):
-    def __init__(self):
+    def __init__(self, login_flag: str, key_flag: str, type: str):
-        pass
+        self.login_flag = login_flag
+        self.key_flag = key_flag
+        self.type = type
+
+    def restic_repo(self, repository_name: str) -> str:
+        # https://restic.readthedocs.io/en/latest/030_preparing_a_new_repo.html#other-services-via-rclone
+        # https://forum.rclone.org/t/can-rclone-be-run-solely-with-command-line-options-no-config-no-env-vars/6314/5
+        return f"rclone::{self.type}:{self._repository_name}/sfbackup"
+
+    def rclone_args(self):
+        return "rclone.args=serve restic --stdio" + self.backend_rclone_args()
+
+    def backend_rclone_args(self, account: str, key: str):
+        return f"{self.login_flag} {account} {self.key_flag} {key}"
+
+    def restic_command(self, account: str, key: str, *args):
+        return [
+            "restic",
+            "-o",
+            self.rclone_args(),
+            "-r",
+            self.restic_repo(account, key),
+        ].extend(args)