rawfile-localpv/declarative.py

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2020-06-13 23:47:32 +00:00
import os
from pathlib import Path
from util import run
def be_absent(path):
path = Path(path)
if not path.exists():
return
elif path.is_symlink() or path.is_file():
path.unlink()
elif path.is_dir():
path.rmdir()
# XXX: should we `shutil.rmtree(path)` instead?
else:
raise Exception("Unknown file type")
def be_symlink(path, to):
path = Path(path)
to = Path(to)
if path.exists():
if path.is_symlink():
if os.readlink(path) == str(to):
return
be_absent(path)
path.symlink_to(to)
def be_mounted(dev, mountpoint):
dev = Path(dev).resolve()
mountpoint = Path(mountpoint)
if mountpoint.is_mount():
if True: # TODO: verify that the right device is mounted
return
# noinspection PyUnreachableCode
be_unmounted(mountpoint)
run(f"mount {dev} {mountpoint}")
def be_unmounted(path):
path = Path(path)
while path.is_mount():
run(f"umount {path}")