The network layer was the wrong place for this. Tested remotely today: opening RethinkDNS and switching off its device blocklists un-blocked YouTube in a few taps, and no device owner API can stop that -- an on-device filter app always owns its own rules.
App hiding is different. 'pm unhide' from adb shell throws a SecurityException and the package stays hidden; only the device owner can reverse it, and reaching that costs a factory reset. So the block moves there, scoped to an explicit allowlist and the home geofence.
Both whitelists are rewritten from the apps that actually exist on this phone. The old ones described the rooted Blackview. Every browser is excluded now, so at home a link does not open at all -- confirmed as intended.
LAUNCHER_PACKAGE was still the Blackview's launcher, which is not installed here. The exporter refused to render the policy twice over it -- precisely what that check is for.
The network layer stays a soft deterrent by choice: pinned and uninstall-blocked, but without lockdown, and its blocklists remain switchable.
Private DNS is implemented but ships disabled. stunnel logged zero connections from the handset across two pin attempts, so the router does not forward 853.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014DqEd1uUhyT52KjaNeLanC
setup_hosts_guard.sh died partway on every run under `set -euo pipefail`,
which is why hosts-guard.path / hosts-bind-mount.service / nsswitch-guard.path
sat installed-but-disabled since 2026-02-02 and resolved-guard.path was never
installed at all — /etc/hosts had no watcher to restore it if tampered.
Two aborts, both silent:
1. `local_dot=$(grep -E '^\s*DNSOverTLS\s*=' ... | tail -1 | sed ...)` — grep
exits 1 when the key is absent, pipefail propagates, the assignment returns
1, set -e kills the script. DNSOverTLS is absent from a default
resolved.conf, so this fired on EVERY run, right before resolved-guard.path
was enabled. The fix-if-missing branch below it was unreachable because
detecting "missing" aborted first. Same trap on the ReadEtcHosts probe.
check_and_enable_services.sh already guarded its copy with `|| true`.
2. `systemctl restart systemd-resolved` — resolved is MASKED here (dnsmasq
serves DNS), so the restart failed and aborted the script on its last step,
after everything was already configured. Now skipped with a note.
Before: exit 1, resolved-guard disabled, nsswitch-guard start-limit-hit.
After: exit 0; hosts-guard.path, hosts-bind-mount.service, nsswitch-guard.path
and resolved-guard.path all enabled+active. DNS still resolves; getent ahosts
on doubleclick/googlesyndication/facebook returns 0.0.0.0; /etc/hosts still
immutable at 176888 lines.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JsCs1GUyiinA7bg68YvAh1
Immutable git-tracked files break git tooling. The pre-push ci-mirror gate
runs `pre-commit run --all-files`; end-of-file-fixer opens every file rb+
and dies with "PermissionError: Operation not permitted", so no push from a
normal checkout could ever succeed — every push had to be routed through a
throwaway worktree (a fresh checkout gets new, non-immutable inodes). The
same immutability also breaks pre-commit's unstaged-changes stash: the
`git checkout -- .` unlink fails, the restore never runs, and unrelated
unstaged edits are silently reverted.
Enforcement does not depend on these sources being locked: /etc/hosts is
itself chattr +i, hosts-guard.path watches and re-enforces it via
enforce-hosts.sh against the locked-hosts canonical snapshot, and
hosts-bind-mount.service pins it. Editing the sources changes nothing until
install.sh is re-run as root, which regenerates the guarded artifacts.
Companion to 6e3d61d (same fix for setup_midnight_shutdown.sh).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JsCs1GUyiinA7bg68YvAh1
Replaces the bespoke chattr/bind-mount/systemd-watcher implementations for
/etc/hosts and /etc/shutdown-schedule.conf with the new shared guard-lib
(~/guard-lib, guardctl), so screen-locker and steam-backlog-enforcer's new
block-gaming feature stop maintaining parallel copies of the same
tamper-resistance mechanism.
- pacman_wrapper.sh: pre/post hook fallbacks now call guard-lib's generic
unlock-all/relock-all scripts (covers every registered guard instance,
not just /etc/hosts)
- setup_midnight_shutdown.sh: installs/updates its guarded config via
guardctl file-guard instead of hand-rolled chattr + systemd unit
generation; the schedule ratchet logic (block-if-more-lenient) stays
bespoke since guardctl's generic unlock can't represent it
- new hosts/guard/plugins/nsswitch-plugin.sh, resolved-plugin.sh
Also fixes, at user's request even though pre-existing: 3 shellcheck
SC2329 false positives in pacman_wrapper.sh (functions invoked indirectly
by name, not actually dead) and 1 SC2001 style warning (echo|sed VM-name
extraction replaced with parameter expansion, verified equivalent output).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AFNiYQQgSLAkiBXswyimPq
- linux_configuration/tests: update script paths after periodic_background/
reorganisation (hosts_file_monitor, makepkg_capped, music_parallelism,
shutdown_timer_monitor, usage_monitoring_installer_efficiency)
- test_i3blocks_efficiency.sh: remove checks for HEARTBEAT_INTERVAL_S and
WARP_POLL_INTERVAL_S constants that no longer exist
- test_pacman_wrapper_security.sh: remove tests 20-21 (builtin time helpers /
external date calls) that are no longer applicable; update path
- generate_hosts_file.sh: add sed unblock rules for delio.com.pl and
loverslab.com to stay consistent with install.sh whitelist
- steam_backlog_enforcer/scanning.py: remove unplayable_reason arg from
logger.info call (too many format args); drop matching test assertion
- steam_backlog_enforcer/tests/test_protondb.py: add
test_unplayable_reason_no_trending_tier to restore 100% branch coverage
on protondb.py line 97 (was previously covered indirectly)
- Screen locker: disable VT switching (Ctrl+Alt+Fn) via setxkbmap
srvrkeys:none on startup; restore on close (production mode only).
Gracefully skips if setxkbmap is not installed (shutil.which).
Tests: 7 new tests, 100% branch coverage maintained.
- Midnight shutdown: restore real schedule values (Mon-Wed 21:00,
Thu-Sun 22:00, morning end 05:00); re-enable the three commented-out
leniency checks in check_schedule_protection(); self-lock script with
chattr +i at end of enable_midnight_shutdown().
- Hosts install: add UNBLOCK_STATE_FILE tracking for whitelisted domains;
check_unblock_entries_protection() blocks installation if the unblock
list grows; save state after install; self-lock install.sh and
generate_hosts_file.sh with chattr +i.
