mirror of
https://github.com/kuhyx/steam-backlog-enforcer.git
synced 2026-11-11 12:47:32 +01:00
Krzysztof kuhy Rudnicki
aecfd1a3a0
Extract only functions that call nothing else in the module: the iptables/DNS layer and the /etc/hosts protection helpers. A two-way split here does not work -- block_store calls _reblock_hosts while _unblock_hosts calls is_store_blocked, so cutting between them makes the import circular. Choosing the leaf set instead keeps every import one-way and needed almost no test churn, where the earlier attempt cascaded into a dozen patch-target fixes. 1347 tests, 100% coverage. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016A1EYiv7e7HGhET84oa9M3
115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
"""Toggling the protected/immutable flag on /etc/hosts around edits.
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Leaf helpers: they call nothing else in the blocker, so extracting them
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introduces no cycle. Split to keep both files under the 250-line cap.
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"""
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from __future__ import annotations
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import logging
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from pathlib import Path
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import shutil
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import subprocess
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from steam_backlog_enforcer.config import (
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BLOCKED_DOMAINS,
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HOSTS_FILE,
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)
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logger = logging.getLogger(__name__)
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# Path to the hosts install script. _REPO_ROOT resolves to $HOME (this
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# module lives two levels below it); the script itself is in the
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# linux_configuration checkout under testsAndMisc, not directly under $HOME.
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_REPO_ROOT = Path(__file__).resolve().parents[2]
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HOSTS_INSTALL_SCRIPT = (
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_REPO_ROOT
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/ "testsAndMisc"
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/ "linux_configuration"
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/ "scripts"
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/ "periodic_background"
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/ "hosts"
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/ "install.sh"
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)
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# iptables chain name for our blocking rules.
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IPTABLES_CHAIN = "STEAM_ENFORCER"
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# Resolved absolute paths for executables (avoids S607 partial-path warnings).
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_SUDO = shutil.which("sudo") or "/usr/bin/sudo"
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_IPTABLES = shutil.which("iptables") or "/usr/sbin/iptables"
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_BASH = shutil.which("bash") or "/usr/bin/bash"
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_GUARDCTL = shutil.which("guardctl") or "/usr/local/bin/guardctl"
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_TEE = shutil.which("tee") or "/usr/bin/tee"
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# IP address used in /etc/hosts for blocking domains.
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_HOSTS_REDIRECT_IP = ".".join(["0"] * 4)
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def _disable_hosts_protection() -> None:
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"""Temporarily unlock /etc/hosts so its content can be edited.
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Guard-lib: stop watcher, collapse bind mount, chattr -i.
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"""
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subprocess.run(
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[_SUDO, _GUARDCTL, "file-guard", "pacman-unlock", "hosts"],
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capture_output=True,
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timeout=10,
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check=False,
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)
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def _enable_hosts_protection() -> None:
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"""Re-lock /etc/hosts, adopting its current content as the new canonical.
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Guard-lib: chattr +i, reapply bind mount, restart watcher.
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"""
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subprocess.run(
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[_SUDO, _GUARDCTL, "file-guard", "sync", "hosts"],
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capture_output=True,
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timeout=10,
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check=False,
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)
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def _sudo_write_hosts(content: str) -> None:
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"""Write *content* to /etc/hosts via ``sudo tee``."""
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subprocess.run(
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[_SUDO, _TEE, str(HOSTS_FILE)],
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input=content.encode(),
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stdout=subprocess.DEVNULL,
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timeout=10,
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check=True,
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)
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def _reblock_hosts() -> bool:
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"""Uncomment Steam Store entries in /etc/hosts."""
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try:
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_disable_hosts_protection()
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content = HOSTS_FILE.read_text(encoding="utf-8")
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new_lines = []
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changed = False
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for line in content.splitlines(keepends=True):
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stripped = line.strip()
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if stripped.startswith("# ") and any(
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d in stripped for d in BLOCKED_DOMAINS
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):
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# Remove the '# ' prefix.
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uncommented = line.replace("# ", "", 1)
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new_lines.append(uncommented)
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changed = True
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else:
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new_lines.append(line)
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if changed:
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_sudo_write_hosts("".join(new_lines))
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logger.info("Re-enabled Steam Store entries in /etc/hosts.")
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_enable_hosts_protection()
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except OSError:
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logger.exception("Failed to modify /etc/hosts")
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return False
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else:
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return True
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