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# Copyright 2018 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
# Unmount a directory, including any mount points under that
# directory. If /mnt/foo is given, and /mnt/foo/bar is also mounted,
# unmount /mnt/foo/bar first, and /mnt/foo then. Look for sub-mounts
# in /proc/mounts.
import logging
import subprocess
def unmount(what, mounts=None, real_unmount=None):
logging.debug("Unmounting {} and everything on top of it".format(what))
if mounts is None: # pragma: no cover
mounts = _read_proc_mounts()
if real_unmount is None: # pragma: no cover
real_unmount = _real_unmount
mounts = _parse_proc_mounts(mounts)
dirnames = _find_what_to_unmount(mounts, what)
for dirname in dirnames:
real_unmount(dirname)
logging.debug("Finished unmounting {}".format(what))
def _read_proc_mounts(): # pragma: no cover
with open("/proc/mounts") as f:
return f.read()
def _real_unmount(what): # pragma: no cover
try:
subprocess.check_call(["umount", what])
except subprocess.CalledProcessError as e:
logging.info("unmount failed, but ignoring that: %s", e)
def _parse_proc_mounts(text):
return [line.split()[:2] for line in text.splitlines()]
def _find_what_to_unmount(mounts, what):
dirname = _find_mount_point(mounts, what)
dirnameslash = dirname + "/"
to_unmount = [
point
for dev, point in mounts
if point == dirname or point.startswith(dirnameslash)
]
return list(reversed(sorted(to_unmount)))
def _find_mount_point(mounts, what):
for dev, point in mounts:
if what in (dev, point):
return point
raise NotMounted(what)
class NotMounted(Exception):
def __init__(self, what):
super().__init__("Not mounted: {}".format(what))
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