selfprivacy-rest-api/selfprivacy_api/services/generic_service_mover.py

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Python
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"""Generic handler for moving services"""
import subprocess
import time
import pathlib
import shutil
from pydantic import BaseModel
from selfprivacy_api.jobs import Job, JobStatus, Jobs
from selfprivacy_api.utils.huey import huey
from selfprivacy_api.utils.block_devices import BlockDevice
from selfprivacy_api.utils import ReadUserData, WriteUserData
from selfprivacy_api.services.service import Service, ServiceStatus
class FolderMoveNames(BaseModel):
name: str
bind_location: str
owner: str
group: str
@huey.task()
def move_service(
service: Service,
volume: BlockDevice,
job: Job,
folder_names: list[FolderMoveNames],
userdata_location: str,
):
"""Move a service to another volume."""
job = Jobs.get_instance().update(
job=job,
status_text="Performing pre-move checks...",
status=JobStatus.RUNNING,
)
service_name = service.get_display_name()
with ReadUserData() as user_data:
if not user_data.get("useBinds", False):
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error="Server is not using binds.",
)
return
# Check if we are on the same volume
old_volume = service.get_location()
if old_volume == volume.name:
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error=f"{service_name} is already on this volume.",
)
return
# Check if there is enough space on the new volume
if int(volume.fsavail) < service.get_storage_usage():
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error="Not enough space on the new volume.",
)
return
# Make sure the volume is mounted
if volume.name != "sda1" and f"/volumes/{volume.name}" not in volume.mountpoints:
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error="Volume is not mounted.",
)
return
# Make sure current actual directory exists and if its user and group are correct
for folder in folder_names:
if not pathlib.Path(f"/volumes/{old_volume}/{folder.name}").exists():
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error=f"{service_name} is not found.",
)
return
if not pathlib.Path(f"/volumes/{old_volume}/{folder.name}").is_dir():
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error=f"{service_name} is not a directory.",
)
return
if (
not pathlib.Path(f"/volumes/{old_volume}/{folder.name}").owner()
== folder.owner
):
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error=f"{service_name} owner is not {folder.owner}.",
)
return
# Stop service
Jobs.get_instance().update(
job=job,
status=JobStatus.RUNNING,
status_text=f"Stopping {service_name}...",
progress=5,
)
service.stop()
# Wait for the service to stop, check every second
# If it does not stop in 30 seconds, abort
for _ in range(30):
if service.get_status() not in (
ServiceStatus.ACTIVATING,
ServiceStatus.DEACTIVATING,
):
break
time.sleep(1)
else:
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error=f"{service_name} did not stop in 30 seconds.",
)
return
# Unmount old volume
Jobs.get_instance().update(
job=job,
status_text="Unmounting old folder...",
status=JobStatus.RUNNING,
progress=10,
)
for folder in folder_names:
try:
subprocess.run(
["umount", folder.bind_location],
check=True,
)
except subprocess.CalledProcessError:
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error="Unable to unmount old volume.",
)
return
# Move data to new volume and set correct permissions
Jobs.get_instance().update(
job=job,
status_text="Moving data to new volume...",
status=JobStatus.RUNNING,
progress=20,
)
current_progress = 20
folder_percentage = 50 // len(folder_names)
for folder in folder_names:
shutil.move(
f"/volumes/{old_volume}/{folder.name}",
f"/volumes/{volume.name}/{folder.name}",
)
Jobs.get_instance().update(
job=job,
status_text="Moving data to new volume...",
status=JobStatus.RUNNING,
progress=current_progress + folder_percentage,
)
Jobs.get_instance().update(
job=job,
status_text=f"Making sure {service_name} owns its files...",
status=JobStatus.RUNNING,
progress=70,
)
for folder in folder_names:
try:
subprocess.run(
[
"chown",
"-R",
f"{folder.owner}:f{folder.group}",
f"/volumes/{volume.name}/{folder.name}",
],
check=True,
)
except subprocess.CalledProcessError as error:
print(error.output)
Jobs.get_instance().update(
job=job,
status=JobStatus.RUNNING,
error=f"Unable to set ownership of new volume. {service_name} may not be able to access its files. Continuing anyway.",
)
# Mount new volume
Jobs.get_instance().update(
job=job,
status_text=f"Mounting {service_name} data...",
status=JobStatus.RUNNING,
progress=90,
)
for folder in folder_names:
try:
subprocess.run(
[
"mount",
"--bind",
f"/volumes/{volume.name}/{folder.name}",
folder.bind_location,
],
check=True,
)
except subprocess.CalledProcessError as error:
print(error.output)
Jobs.get_instance().update(
job=job,
status=JobStatus.ERROR,
error="Unable to mount new volume.",
)
return
# Update userdata
Jobs.get_instance().update(
job=job,
status_text="Finishing move...",
status=JobStatus.RUNNING,
progress=95,
)
with WriteUserData() as user_data:
if userdata_location not in user_data:
user_data[userdata_location] = {}
user_data[userdata_location]["location"] = volume.name
# Start service
service.start()
Jobs.get_instance().update(
job=job,
status=JobStatus.FINISHED,
result=f"{service_name} moved successfully.",
status_text=f"Starting {service_name}...",
progress=100,
)