selfprivacy-rest-api/selfprivacy_api/utils/block_devices.py

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"""A block device API wrapping lsblk"""
from __future__ import annotations
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import subprocess
import json
import typing
from pydantic import BaseModel
from selfprivacy_api.utils import WriteUserData
from selfprivacy_api.utils.singleton_metaclass import SingletonMetaclass
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def get_block_device(device_name):
"""
Return a block device by name.
"""
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# TODO: remove the function and related tests: dublicated by singleton
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lsblk_output = subprocess.check_output(
[
"lsblk",
"-J",
"-b",
"-o",
"NAME,PATH,FSAVAIL,FSSIZE,FSTYPE,FSUSED,MOUNTPOINTS,LABEL,UUID,SIZE,MODEL,SERIAL,TYPE",
f"/dev/{device_name}",
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]
)
lsblk_output = lsblk_output.decode("utf-8")
lsblk_output = json.loads(lsblk_output)
return lsblk_output["blockdevices"][0]
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def resize_block_device(block_device) -> bool:
"""
Resize a block device. Return True if successful.
"""
resize_command = ["resize2fs", block_device]
try:
subprocess.check_output(resize_command, shell=False)
except subprocess.CalledProcessError:
return False
return True
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class BlockDevice:
"""
A block device.
"""
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def __init__(self, device_dict: dict):
self.update_from_dict(device_dict)
def update_from_dict(self, device_dict: dict):
self.name = device_dict["name"]
self.path = device_dict["path"]
self.fsavail = str(device_dict["fsavail"])
self.fssize = str(device_dict["fssize"])
self.fstype = device_dict["fstype"]
self.fsused = str(device_dict["fsused"])
self.mountpoints = device_dict["mountpoints"]
self.label = device_dict["label"]
self.uuid = device_dict["uuid"]
self.size = str(device_dict["size"])
self.model = device_dict["model"]
self.serial = device_dict["serial"]
self.type = device_dict["type"]
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self.locked = False
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self.children: typing.List[BlockDevice] = []
if "children" in device_dict.keys():
for child in device_dict["children"]:
self.children.append(BlockDevice(child))
def all_children(self) -> typing.List[BlockDevice]:
result = []
for child in self.children:
result.extend(child.all_children())
result.append(child)
return result
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def __str__(self):
return self.name
def __repr__(self):
return f"<BlockDevice {self.name} of size {self.size} mounted at {self.mountpoints}>"
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def __eq__(self, other):
return self.name == other.name
def __hash__(self):
return hash(self.name)
def is_root(self) -> bool:
"""
Return True if the block device is the root device.
"""
return "/" in self.mountpoints
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def stats(self) -> typing.Dict[str, typing.Any]:
"""
Update current data and return a dictionary of stats.
"""
device = get_block_device(self.name)
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self.update_from_dict(device)
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return {
"name": self.name,
"path": self.path,
"fsavail": self.fsavail,
"fssize": self.fssize,
"fstype": self.fstype,
"fsused": self.fsused,
"mountpoints": self.mountpoints,
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"label": self.label,
"uuid": self.uuid,
"size": self.size,
"model": self.model,
"serial": self.serial,
"type": self.type,
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}
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def is_usable_partition(self):
# Ignore devices with type "rom"
if self.type == "rom":
return False
if self.fstype == "ext4":
return True
return False
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def resize(self):
"""
Resize the block device.
"""
if not self.locked:
self.locked = True
resize_block_device(self.path)
self.locked = False
def mount(self) -> bool:
"""
Mount the block device.
"""
with WriteUserData() as user_data:
if "volumes" not in user_data:
user_data["volumes"] = []
# Check if the volume is already mounted
for volume in user_data["volumes"]:
if volume["device"] == self.path:
return False
user_data["volumes"].append(
{
"device": self.path,
"mountPoint": f"/volumes/{self.name}",
"fsType": self.fstype,
}
)
return True
def unmount(self) -> bool:
"""
Unmount the block device.
"""
with WriteUserData() as user_data:
if "volumes" not in user_data:
user_data["volumes"] = []
# Check if the volume is already mounted
for volume in user_data["volumes"]:
if volume["device"] == self.path:
user_data["volumes"].remove(volume)
return True
return False
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# TODO: SingletonMetaclass messes with tests and is able to persist state
# between them. If you have very weird test crosstalk that's probably why
# I am not sure it NEEDS to be SingletonMetaclass
class BlockDevices(metaclass=SingletonMetaclass):
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"""Singleton holding all Block devices"""
def __init__(self):
self.block_devices = []
self.update()
def update(self) -> None:
"""
Update the list of block devices.
"""
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devices = BlockDevices.lsblk_devices()
children = []
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for device in devices:
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children.extend(device.all_children())
devices.extend(children)
valid_devices = [device for device in devices if device.is_usable_partition()]
self.block_devices = valid_devices
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def get_block_device(self, name: str) -> typing.Optional[BlockDevice]:
"""
Return a block device by name.
"""
for block_device in self.block_devices:
if block_device.name == name:
return block_device
return None
def get_block_devices(self) -> typing.List[BlockDevice]:
"""
Return a list of block devices.
"""
return self.block_devices
def get_block_devices_by_mountpoint(
self, mountpoint: str
) -> typing.List[BlockDevice]:
"""
Return a list of block devices with a given mountpoint.
"""
block_devices = []
for block_device in self.block_devices:
if mountpoint in block_device.mountpoints:
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block_devices.append(block_device)
return block_devices
def get_root_block_device(self) -> BlockDevice:
"""
Return the root block device.
"""
for block_device in self.block_devices:
if "/" in block_device.mountpoints:
return block_device
raise RuntimeError("No root block device found")
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@staticmethod
def lsblk_device_dicts() -> typing.List[dict]:
lsblk_output_bytes = subprocess.check_output(
[
"lsblk",
"-J",
"-b",
"-o",
"NAME,PATH,FSAVAIL,FSSIZE,FSTYPE,FSUSED,MOUNTPOINTS,LABEL,UUID,SIZE,MODEL,SERIAL,TYPE",
]
)
lsblk_output = lsblk_output_bytes.decode("utf-8")
return json.loads(lsblk_output)["blockdevices"]
@staticmethod
def lsblk_devices() -> typing.List[BlockDevice]:
devices = []
for device in BlockDevices.lsblk_device_dicts():
devices.append(device)
return [BlockDevice(device) for device in devices]