feature(services): allow moving uninitialized services

selfprivacy_api/services/service.py

@@ -2,6 +2,7 @@
 
 from abc import ABC, abstractmethod
 from typing import List, Optional
+from os.path import exists
 
 from selfprivacy_api import utils
 from selfprivacy_api.services.config_item import ServiceConfigItem
@@ -237,6 +238,16 @@ class Service(ABC):
             storage_used += get_storage_usage(folder)
         return storage_used
 
+    @classmethod
+    def has_folders(cls) -> int:
+        """
+        If there are no folders on disk, moving is noop
+        """
+        for folder in cls.get_folders():
+            if exists(folder):
+                return True
+        return False
+
     @classmethod
     def get_dns_records(cls, ip4: str, ip6: Optional[str]) -> List[ServiceDnsRecord]:
         subdomain = cls.get_subdomain()
@@ -358,7 +369,10 @@ class Service(ABC):
         binds = self.binds()
         if binds == []:
             raise MoveError("nothing to move")
-        check_binds(current_volume_name, binds)
+
+        # It is ok if service is uninitialized, we will just reregister it
+        if self.has_folders():
+            check_binds(current_volume_name, binds)
 
     def do_move_to_volume(
         self,
@@ -401,7 +415,18 @@ class Service(ABC):
         service_name = self.get_display_name()
 
         report_progress(0, job, "Performing pre-move checks...")
+
         self.assert_can_move(volume)
+        if not self.has_folders():
+            self.set_location(volume)
+            Jobs.update(
+                job=job,
+                status=JobStatus.FINISHED,
+                result=f"{service_name} moved successfully(no folders).",
+                status_text=f"NOT starting {service_name}",
+                progress=100,
+            )
+            return job
 
         report_progress(5, job, f"Stopping {service_name}...")
         assert self is not None

selfprivacy_api/services/test_service/__init__.py

@@ -5,6 +5,7 @@ import subprocess
 
 from typing import List
 from os import path
+from pathlib import Path
 
 # from enum import Enum
 
@@ -73,8 +74,11 @@ class DummyService(Service):
     @classmethod
     def status_file(cls) -> str:
         dir = cls.folders[0]
-        # we do not REALLY want to store our state in our declared folders
-        return path.join(dir, "..", "service_status")
+        # We do not want to store our state in our declared folders
+        # Because they are moved and tossed in tests wildly
+        parent = Path(dir).parent
+
+        return path.join(parent, "service_status")
 
     @classmethod
     def set_status(cls, status: ServiceStatus):

tests/test_graphql/test_services.py

@@ -2,7 +2,7 @@ import pytest
 import shutil
 
 from typing import Generator
-from os import mkdir
+from os import mkdir, rmdir
 
 from selfprivacy_api.utils.block_devices import BlockDevices
 
@@ -605,6 +605,11 @@ def test_graphql_move_service_without_folders_on_old_volume(
     mock_lsblk_devices,
     dummy_service: DummyService,
 ):
+    """
+    Situation when you have folders in the filetree but they are not mounted
+    but just folders
+    """
+
     target = "sda1"
     BlockDevices().update()
     assert BlockDevices().get_block_device(target) is not None
@@ -618,6 +623,59 @@ def test_graphql_move_service_without_folders_on_old_volume(
     assert "sda2/test_service is not found" in data["message"]
 
 
+def test_move_empty(
+    authorized_client, generic_userdata, mock_check_volume, dummy_service, fp
+):
+    """
+    A reregister of uninitialized service with no data.
+    No binds in place yet, and no rebuilds should happen.
+    """
+
+    origin = "sda1"
+    target = "sda2"
+    assert BlockDevices().get_block_device(target) is not None
+    assert BlockDevices().get_block_device(origin) is not None
+
+    dummy_service.set_drive(origin)
+    dummy_service.set_simulated_moves(False)
+    dummy_service.disable()
+
+    unit_name = "sp-nixos-rebuild.service"
+    rebuild_command = ["systemctl", "start", unit_name]
+    prepare_nixos_rebuild_calls(fp, unit_name)
+
+    # We will NOT be mounting and remounting folders
+    mount_command = ["mount", fp.any()]
+    unmount_command = ["umount", fp.any()]
+    fp.pass_command(mount_command, 2)
+    fp.pass_command(unmount_command, 2)
+
+    # We will NOT be changing ownership
+    chown_command = ["chown", fp.any()]
+    fp.pass_command(chown_command, 2)
+
+    # We have virtual binds encapsulating our understanding where this should go.
+    assert len(dummy_service.binds()) == 2
+
+    # Remove all folders
+    for folder in dummy_service.get_folders():
+        shutil.rmtree(folder)
+
+    # They are virtual and unaffected by folder removal
+    assert len(dummy_service.binds()) == 2
+
+    mutation_response = api_move(authorized_client, dummy_service, target)
+
+    data = get_data(mutation_response)["services"]["moveService"]
+    assert_ok(data)
+    assert data["service"] is not None
+
+    assert fp.call_count(rebuild_command) == 0
+    assert fp.call_count(mount_command) == 0
+    assert fp.call_count(unmount_command) == 0
+    assert fp.call_count(chown_command) == 0
+
+
 def test_graphql_move_service(
     authorized_client, generic_userdata, mock_check_volume, dummy_service_with_binds, fp
 ):