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import pathlib, glob
import logging
from typing import Union
from .helpers import get_mount_info
from ..exceptions import DiskError
from ..general import SysCommand
from ..output import log
def mount_subvolume(installation, subvolume_location :Union[pathlib.Path, str], force=False) -> bool:
"""
This function uses mount to mount a subvolume on a given device, at a given location with a given subvolume name.
@installation: archinstall.Installer instance
@subvolume_location: a localized string or path inside the installation / or /boot for instance without specifying /mnt/boot
@force: overrides the check for weither or not the subvolume mountpoint is empty or not
"""
installation_mountpoint = installation.target
if type(installation_mountpoint) == str:
installation_mountpoint = pathlib.Path(installation_mountpoint)
# Set up the required physical structure
if type(subvolume_location) == str:
subvolume_location = pathlib.Path(subvolume_location)
target = installation_mountpoint / subvolume_location.relative_to(subvolume_location.anchor)
if not target.exists():
target.mkdir(parents=True)
if glob.glob(str(target/'*')) and force is False:
raise DiskError(f"Cannot mount subvolume to {target} because it contains data (non-empty folder target)")
log(f"Mounting {target} as a subvolume", level=logging.INFO)
# Mount the logical volume to the physical structure
mount_information, mountpoint_device_real_path = get_mount_info(target, traverse=True, return_real_path=True)
if mountpoint_device_real_path == str(target):
log(f"Unmounting non-subvolume {mount_information['source']} previously mounted at {target}")
SysCommand(f"umount {mount_information['source']}")
return SysCommand(f"mount {mount_information['source']} {target} -o subvol=@{subvolume_location}").exit_code == 0
def create_subvolume(installation, subvolume_location :Union[pathlib.Path, str]) -> bool:
"""
This function uses btrfs to create a subvolume.
@installation: archinstall.Installer instance
@subvolume_location: a localized string or path inside the installation / or /boot for instance without specifying /mnt/boot
"""
installation_mountpoint = installation.target
if type(installation_mountpoint) == str:
installation_mountpoint = pathlib.Path(installation_mountpoint)
# Set up the required physical structure
if type(subvolume_location) == str:
subvolume_location = pathlib.Path(subvolume_location)
target = installation_mountpoint / subvolume_location.relative_to(subvolume_location.anchor)
# Difference from mount_subvolume:
# We only check if the parent exists, since we'll run in to "target path already exists" otherwise
if not target.parent.exists():
target.parent.mkdir(parents=True)
if glob.glob(str(target/'*')) and force is False:
raise DiskError(f"Cannot create subvolume at {target} because it contains data (non-empty folder target)")
# Remove the target if it exists
if target.exists():
target.rmdir()
log(f"Creating a subvolume on {target}", level=logging.INFO)
if (cmd := SysCommand(f"btrfs subvolume create {target}")).exit_code != 0:
raise DiskError(f"Could not create a subvolume at {target}: {cmd}")
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