testsAndMisc/linux_configuration/scripts/periodic_background/hosts
Krzysztof kuhy Rudnicki 779ace0c87 fix(hosts-guard): stop setup aborting silently, so the guards actually enable
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
2026-07-17 08:25:51 +02:00
..
guard fix(hosts-guard): stop setup aborting silently, so the guards actually enable 2026-07-17 08:25:51 +02:00
generate_hosts_file.sh feat(phone): automate BL-9000 fresh-phone recovery after factory reset 2026-05-31 16:22:49 +02:00
install.sh fix(hosts): stop chattr +i'ing install.sh and generate_hosts_file.sh sources 2026-07-17 08:06:46 +02:00