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92 lines
2.3 KiB
Bash
Executable File
92 lines
2.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Shared functions for hosts-guard pacman hooks
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# This file is sourced by pacman-pre-unlock-hosts.sh and pacman-post-relock-hosts.sh
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TARGET=/etc/hosts
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LOGTAG=hosts-guard-hook
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# Check if target has a read-only mount
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is_ro_mount() {
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findmnt -no OPTIONS -T "$TARGET" 2>/dev/null | grep -qw ro
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}
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# Count mount layers for the target
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mount_layers_count() {
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awk '$5=="/etc/hosts"{c++} END{print c+0}' /proc/self/mountinfo 2>/dev/null || echo 0
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}
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# Collapse all bind mount layers
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collapse_mounts() {
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local i=0
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if command -v mountpoint >/dev/null 2>&1; then
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while mountpoint -q "$TARGET"; do
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umount -l "$TARGET" >/dev/null 2>&1 || break
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i=$((i + 1))
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((i > 20)) && break
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done
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else
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local cnt
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cnt=$(mount_layers_count)
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while ((cnt > 1)); do
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umount -l "$TARGET" >/dev/null 2>&1 || break
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i=$((i + 1))
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((i > 20)) && break
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cnt=$(mount_layers_count)
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done
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fi
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}
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# Stop systemd units related to hosts guard
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stop_units_if_present() {
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local units=(hosts-bind-mount.service hosts-guard.path)
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for u in "${units[@]}"; do
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if command -v systemctl >/dev/null 2>&1; then
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if systemctl list-unit-files 2>/dev/null | grep -q "^$u"; then
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systemctl stop "$u" >/dev/null 2>&1 || true
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fi
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fi
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done
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}
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# Remove immutable/append-only attributes
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remove_host_attrs() {
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if command -v lsattr >/dev/null 2>&1; then
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local attrs
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attrs=$(lsattr -d "$TARGET" 2>/dev/null || true)
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if echo "$attrs" | grep -q " i "; then
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chattr -i "$TARGET" >/dev/null 2>&1 || true
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fi
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if echo "$attrs" | grep -q " a "; then
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chattr -a "$TARGET" >/dev/null 2>&1 || true
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fi
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fi
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}
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# Apply immutable attribute
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apply_immutable() {
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if command -v chattr >/dev/null 2>&1; then
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chattr +i "$TARGET" >/dev/null 2>&1 || true
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fi
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}
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# Apply a single read-only bind mount layer
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apply_ro_bind_mount() {
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mount --bind "$TARGET" "$TARGET" >/dev/null 2>&1 || true
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mount -o remount,ro,bind "$TARGET" >/dev/null 2>&1 || true
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}
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# Start the path watcher service
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start_path_watcher() {
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if command -v systemctl >/dev/null 2>&1; then
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systemctl start hosts-guard.path >/dev/null 2>&1 || true
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fi
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}
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# Log to system logger and run log file
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log_hook() {
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local phase="$1"
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local state="$2"
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logger -t "$LOGTAG" "$phase: $state"
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echo "$(date -Is) $phase-$state" >>/run/hosts-guard-hook.log 2>/dev/null || true
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}
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