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clcagefs.py

# -*- coding: utf-8 -*-

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc
# 2010-2018 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
#

import os
import re
import subprocess

CAGEFS_MP_FILENAME = "/etc/cagefs/cagefs.mp"
CAGEFSCTL_TOOL = "/usr/sbin/cagefsctl"

class CagefsMpConflict(Exception):
    def __init__(self, new_item, existing_item):
        self._msg = (
            "Conflict in adding '%s' to %s because of pre-existing "
            "alternative specification: '%s'"
            % (new_item, CAGEFS_MP_FILENAME, existing_item)
        )

def __str__(self):
        return self._msg

class CagefsMpItem:
    PREFIX_LIST = b"@!%"
    _PREFIX_MOUNT_RW = b""
    _PREFIX_MOUNT_RO = b"!"

def __init__(self, arg):
        """Constructor

:param arg: Is either path to add to cagefs.mp or a raw line is read
        from cagefs.mp
        :param prefix: The same as adding prefix '!' to arg before passing it
        to ctor"""

if arg[:1] == b"#":  # is a comment? then init as dummy
            self._path_spec = None
        elif arg.strip() == b"":  # init as dummy for empty lines
            self._path_spec = None
        else:
            self._path_spec = arg

def mode(self, mode):
        """Specify mode as in fluent constructor"""

if self.prefix() == b"@" and mode is not None:
            self._path_spec = b"%s,%03o" % (self._path_spec, mode)

return self

def __str__(self):
        return os.fsdecode(self._path_spec)

@staticmethod
    def _add_slash(path):
        if path == b"":
            return b"/"
        if path[-1] != b"/"[0]:
            return path + b"/"
        return path

def pre_exist_in(self, another):
        adopted = CagefsMpItem._adopt(another)

# overkill: just to keep strictly to comparing NULL objects principle
        if self.is_dummy() or adopted.is_dummy():
            return False

this_path = CagefsMpItem._add_slash(self.path())
        test_preexist_in_path = CagefsMpItem._add_slash(adopted.path())
        return this_path.startswith(test_preexist_in_path)

def is_compatible_by_prefix_with(self, existing):
        adopted = CagefsMpItem._adopt(existing)

# overkill: just to keep strictly to comparing NULL objects principle
        if self.is_dummy() or adopted.is_dummy():
            return False

if self.prefix() == adopted.prefix():
            return True

prefix_compatibility_map = {
            CagefsMpItem._PREFIX_MOUNT_RW: [CagefsMpItem._PREFIX_MOUNT_RO]
        }
        null_options = []

return self.prefix() in prefix_compatibility_map.get(
            adopted.prefix(), null_options
        )

def is_dummy(self):
        return self._path_spec is None

@staticmethod
    def _adopt(x):
        if isinstance(x, CagefsMpItem):
            return x
        else:
            return CagefsMpItem(x)

@staticmethod
    def _cut_off_mode(path_spec):
        """Cut off mode from path spec like @/var/run/screen,777

Only one comma per path spec is allowed ;-)"""

return path_spec.split(b",")[0]

@staticmethod
    def _cut_off_prefix(path_spec):
        return path_spec.lstrip(CagefsMpItem.PREFIX_LIST)

def path(self):
        return CagefsMpItem._cut_off_prefix(
            CagefsMpItem._cut_off_mode(self._path_spec)
        )

def prefix(self):
        if self._path_spec != self.path():
            return self._path_spec[0:1]
        else:
            return b""

def spec(self):
        return self._path_spec

def is_cagefs_present():
    return os.path.exists(CAGEFSCTL_TOOL)

def _mk_mount_dir_setup_perm(path, mode=0o755, owner_id=None, group_id=None):
    # -1 means 'unchanged'
    if group_id is None:
        group_id = -1
    if owner_id is None:
        owner_id = -1

if not os.path.isdir(path):
        os.mkdir(path)

if mode is not None:
        os.chmod(path, mode)

os.chown(path, owner_id, group_id)

def setup_mount_dir_cagefs(
    path,
    added_by,
    mode=0o755,
    owner_id=None,
    group_id=None,
    prefix=b"",
    remount_cagefs=True,
):
    """
    Add mount point to /etc/cagefs/cagefs.mp

:param path: Directory path to be added in cagefs.mp and mounted
                 from within setup_mount_dir_cagefs().
                 If this directory does not exist, then it is created.

:param added_by: package or component, mount dir relates to, or whatever
                     will stay in cagefs.mp with "# added by..." comment

:param mode: If is not None: Regardless of whether directory exists or not
                 prior this call, it's permissions will be set to mode.

:param owner_id: Regardless of whether directory exists or not prior this
                     call, it's owner id will be set to.
                     If None, the owner won't be changed.

:param group_id: Regardless of whether directory exists or not prior this
                     call, it's group id will be set to.
                     If None, the group won't be changed.

:param prefix: Mount point prefix. Default is mount as RW.
                   Pass '!' to add read-only mount point.
                   Refer CageFS section at http://docs.cloudlinux.com/
                   for more options.

:param remount_cagefs: If True, cagefs skeleton will be automatically
                           remounted to apply changes.

:returns: None

Propagates native EnvironmentError if no CageFS installed or something
    else goes wrong.

Raises CagefsMpConflict if path is already specified in cagefs.mp,
    but in a way which is opposite to mount_as_readonly param.
    """

_mk_mount_dir_setup_perm(path, mode, owner_id, group_id)

# Create cagefs.mp if absent. It will be merged when cagefsctl --init.
    if not os.path.exists(CAGEFS_MP_FILENAME):
        subprocess.call([CAGEFSCTL_TOOL, "--create-mp"])

subprocess.call([CAGEFSCTL_TOOL, "--check-mp"])
    # ^^
    # Hereafter we will not care if there was
    # 'no newline at the end of file'

cagefs_mp = open(CAGEFS_MP_FILENAME, "rb+")
    try:
        new_item = CagefsMpItem(prefix + path).mode(mode)

trim_nl_iter = (file_line.rstrip() for file_line in cagefs_mp)
        pre_exist_option = [
            x for x in trim_nl_iter if new_item.pre_exist_in(x)
        ]

if not pre_exist_option:
            cagefs_mp.seek(0, 2)  # 2: seek to the end of file

# no newline is allowed
            added_by = added_by.replace("\n", " ")

cagefs_mp.write(
                b"# next line is added by " + added_by.encode("utf-8") + b"\n"
            )
            cagefs_mp.write(new_item.spec() + b"\n")
            cagefs_mp.close()

if remount_cagefs:
                subprocess.call([CAGEFSCTL_TOOL, "--remount-all"])

elif not new_item.is_compatible_by_prefix_with(pre_exist_option[-1]):
            raise CagefsMpConflict(new_item, pre_exist_option[-1])

finally:
        cagefs_mp.close()

def _get_cagefs_mp_lines():
    with open(CAGEFS_MP_FILENAME, "rb") as f:
        return f.readlines()

def _write_cagefs_mp_lines(lines):
    with open(CAGEFS_MP_FILENAME, "wb") as f:
        return f.writelines(lines)

def remove_mount_dir_cagefs(path, remount_cagefs=True):
    """
    Remove mount points matching given path from cagefs.mp file
    :param str path: Path that should be removed from file.
    :param bool remount_cagefs: Remount cagefs skeleton or not
    :return: Nothing
    """
    lines = _get_cagefs_mp_lines()

r = re.compile(
        rb"^[%s]?%s(,\d+)?$" % (CagefsMpItem.PREFIX_LIST, re.escape(path))
    )
    lines_with_excluded_path = (line for line in lines if not r.match(line))

_write_cagefs_mp_lines(lines_with_excluded_path)
    if remount_cagefs:
        subprocess.call([CAGEFSCTL_TOOL, "--remount-all"])

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-11-16 07:53:35
..	dir	-	0755	2025-11-16 07:53:35
__pycache__	dir	-	0755	2025-11-16 07:53:35
features	dir	-	0755	2025-11-16 07:53:35
panels	dir	-	0755	2025-11-16 07:53:35
__init__.py	file	0 B	0644	2025-10-16 12:33:08
backup_systems.py	file	11.19 KB	0644	2025-10-16 12:33:08
clcagefs.py	file	7.79 KB	0644	2025-10-16 12:33:08
notifier.py	file	1.82 KB	0644	2025-10-16 12:33:08
persistent_state.py	file	1.88 KB	0644	2025-10-16 12:33:08
svcctl.py	file	8.67 KB	0644	2025-10-16 12:33:08
sysctl.py	file	379 B	0644	2025-10-16 12:33:08
systemd_notifier.py	file	1.58 KB	0644	2025-10-16 12:33:08
web_server.py	file	21.22 KB	0644	2025-10-16 12:33:08