91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
|
"""
|
||
|
Copyright 2017 Oliver Smith
|
||
|
|
||
|
This file is part of pmbootstrap.
|
||
|
|
||
|
pmbootstrap 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.
|
||
|
|
||
|
pmbootstrap 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 pmbootstrap. If not, see <http://www.gnu.org/licenses/>.
|
||
|
"""
|
||
|
import os
|
||
|
import pmb.helpers.run
|
||
|
|
||
|
|
||
|
def ismount(folder):
|
||
|
"""
|
||
|
Ismount() implementation, that works for mount --bind.
|
||
|
Workaround for: https://bugs.python.org/issue29707
|
||
|
"""
|
||
|
folder = os.path.abspath(folder)
|
||
|
with open("/proc/mounts", "r") as handle:
|
||
|
for line in handle:
|
||
|
words = line.split()
|
||
|
if len(words) >= 2 and words[1] == folder:
|
||
|
return True
|
||
|
return False
|
||
|
|
||
|
|
||
|
def bind(args, source, destination, create_folders=True):
|
||
|
"""
|
||
|
Mount --bind a folder and create necessary directory structure.
|
||
|
"""
|
||
|
if ismount(destination):
|
||
|
return
|
||
|
|
||
|
# Check/create folders
|
||
|
for path in [source, destination]:
|
||
|
if os.path.exists(path):
|
||
|
continue
|
||
|
if create_folders:
|
||
|
pmb.helpers.run.root(args, ["mkdir", "-p", path])
|
||
|
else:
|
||
|
raise RuntimeError("Mount failed, folder does not exist: " +
|
||
|
path)
|
||
|
|
||
|
# Actually mount the folder
|
||
|
pmb.helpers.run.root(args, ["mount", "--bind", source, destination])
|
||
|
|
||
|
# Verify, that it has worked
|
||
|
if not ismount(destination):
|
||
|
raise RuntimeError("Mount failed: " + source + " -> " + destination)
|
||
|
|
||
|
# Mount a blockdevice
|
||
|
|
||
|
|
||
|
def bind_blockdevice(args, source, destination):
|
||
|
# Skip existing mountpoint
|
||
|
if ismount(destination):
|
||
|
return
|
||
|
|
||
|
# Create empty file
|
||
|
if not os.path.exists(destination):
|
||
|
pmb.helpers.run.root(args, ["touch", destination])
|
||
|
|
||
|
# Mount
|
||
|
pmb.helpers.run.root(args, ["mount", "--bind", source,
|
||
|
destination])
|
||
|
|
||
|
|
||
|
def umount_all(args, folder):
|
||
|
"""
|
||
|
Umount all folders, that are mounted inside a given folder.
|
||
|
"""
|
||
|
folder = os.path.abspath(folder)
|
||
|
with open("/proc/mounts", "r") as handle:
|
||
|
for line in handle:
|
||
|
words = line.split()
|
||
|
if len(words) < 2 or not words[1].startswith(folder):
|
||
|
continue
|
||
|
pmb.helpers.run.root(args, ["umount", words[1]])
|
||
|
if ismount(words[1]):
|
||
|
raise RuntimeError("Failed to umount: " + words[1])
|