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✏️ Editing: libhooks.py

# -*- coding: utf-8 -*-
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2025 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
"""Hook integration functions for crontab operations."""

import logging
import shlex
import subprocess

from clcommon.cpapi import userdomains

from .constants import ISOLATION_WRAPPER
from .parser import parse_crontab_structure, write_crontab_structure
from .structure import ParsedCrontabLine

CRONTAB_BIN = "/usr/bin/crontab"

logger = logging.getLogger(__name__)

def migrate_crontab_docroot(
    username: str,
    old_docroot: str,
    new_docroot: str,
) -> bool:
    """
    Migrate crontab entries from old document root to new document root.

When a document root path changes (e.g., domain rename, docroot move),
    this function updates all crontab entries that reference the old path
    to use the new path instead.

Args:
        username: Unix username whose crontab to migrate
        old_docroot: Previous document root path
        new_docroot: New document root path

Returns:
        bool: True if migration was successful, False if no changes needed or error

Raises:
        Exception: If crontab operations fail critically
    """
    if '\n' in old_docroot or '\r' in old_docroot:
        raise ValueError(f'Invalid old_docroot: {old_docroot!r}')
    if '\n' in new_docroot or '\r' in new_docroot:
        raise ValueError(f'Invalid new_docroot: {new_docroot!r}')

# Get current crontab for the user
    list_result = subprocess.run(
        [CRONTAB_BIN, "-u", username, "-l"],
        capture_output=True,
    )

# No existing crontab - nothing to migrate
    if list_result.returncode != 0:
        logger.debug(
            "No crontab to migrate for user %s (returncode: %d)",
            username,
            list_result.returncode,
        )
        return False

existing_data = list_result.stdout
    if not existing_data:
        logger.debug("Empty crontab for user %s, nothing to migrate", username)
        return False

# Parse existing crontab into structure
    structure = parse_crontab_structure(existing_data)

# Check if old docroot section exists
    if old_docroot not in structure.docroot_sections:
        logger.debug(
            "No crontab entries found for old docroot %s for user %s",
            old_docroot,
            username,
        )
        return False

# Migrate: move entries from old docroot to new docroot
    old_entries = structure.docroot_sections.pop(old_docroot)

# Update wrapper commands in the entries to use new docroot
    migrated_entries = []
    for entry in old_entries:
        if isinstance(entry, ParsedCrontabLine):
            # Get the clean command (without wrapper)
            clean_command = entry.get_clean_command()
            has_newline = clean_command.endswith(b"\n")
            command_str = clean_command.rstrip(b"\n").decode("utf-8", errors="replace")

# Rebuild with new docroot
            quoted_command = shlex.quote(command_str)
            prefix_parts = shlex.join([ISOLATION_WRAPPER, new_docroot, "bash", "-c"])
            wrapped_command_str = f"{prefix_parts} {quoted_command}"
            wrapped_command = wrapped_command_str.encode("utf-8")
            if has_newline:
                wrapped_command += b"\n"

migrated_entries.append(
                ParsedCrontabLine(schedule=entry.schedule, command=wrapped_command)
            )
        else:
            # Keep comments as-is
            migrated_entries.append(entry)

# Add migrated entries to new docroot section (merge with existing if any)
    if new_docroot in structure.docroot_sections:
        structure.docroot_sections[new_docroot].extend(migrated_entries)
    else:
        structure.docroot_sections[new_docroot] = migrated_entries

# Write updated crontab
    modified_data = write_crontab_structure(structure)

save_result = subprocess.run(
        [CRONTAB_BIN, "-u", username, "-"],
        input=modified_data,
        capture_output=True,
    )

if save_result.returncode != 0:
        logger.error(
            "Failed to save migrated crontab for user %s: %s",
            username,
            save_result.stderr.decode("utf-8", errors="replace"),
        )
        return False

logger.info(
        "Successfully migrated crontab entries for user %s from %s to %s",
        username,
        old_docroot,
        new_docroot,
    )
    return True

def cleanup_stale_crontab_sections(
    username: str,
) -> bool:
    """
    Remove crontab sections for docroots that no longer exist.

After a domain is deleted, this function cleans up crontab entries
    for docroots that are no longer valid (not in the current domain list).

Args:
        username: Unix username whose crontab to clean up

Returns:
        bool: True if cleanup was performed, False if no changes needed

Raises:
        Exception: If crontab operations fail critically
    """
    # Get current valid docroots from userdomains
    valid_docroots = {docroot for _, docroot in userdomains(username)}

# Get current crontab for the user
    list_result = subprocess.run(
        [CRONTAB_BIN, "-u", username, "-l"],
        capture_output=True,
    )

# No existing crontab - nothing to clean
    if list_result.returncode != 0:
        logger.debug(
            "No crontab to clean for user %s (returncode: %d)",
            username,
            list_result.returncode,
        )
        return False

existing_data = list_result.stdout
    if not existing_data:
        logger.debug("Empty crontab for user %s, nothing to clean", username)
        return False

structure = parse_crontab_structure(existing_data)
    stale_docroots = [
        docroot for docroot in structure.docroot_sections.keys() if docroot not in valid_docroots
    ]

if not stale_docroots:
        logger.debug(
            "No stale crontab sections found for user %s",
            username,
        )
        return False

for stale_docroot in stale_docroots:
        logger.info(
            "Removing stale crontab section for user %s, docroot: %s",
            username,
            stale_docroot,
        )
        del structure.docroot_sections[stale_docroot]

modified_data = write_crontab_structure(structure)

save_result = subprocess.run(
        [CRONTAB_BIN, "-u", username, "-"],
        input=modified_data,
        capture_output=True,
    )

if save_result.returncode != 0:
        logger.error(
            "Failed to save cleaned crontab for user %s: %s",
            username,
            save_result.stderr.decode("utf-8", errors="replace"),
        )
        return False

logger.info(
        "Successfully cleaned up %d stale crontab section(s) for user %s: %s",
        len(stale_docroots),
        username,
        ", ".join(stale_docroots),
    )
    return True

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