testsAndMisc/linux_configuration/tests/test_hosts_file_monitor.sh

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#!/bin/bash
# Regression tests for hosts-file-monitor.sh behavior.
set -euo pipefail
SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
REPO_DIR=$(cd -- "$SCRIPT_DIR/.." && pwd)
TARGET_SCRIPT="$REPO_DIR/scripts/system-maintenance/bin/hosts-file-monitor.sh"
fail() {
printf 'FAIL: %s\n' "$1" >&2
exit 1
}
assert_equals() {
local expected="$1"
local actual="$2"
local context="$3"
if [[ "$expected" != "$actual" ]]; then
fail "$context (expected: '$expected', actual: '$actual')"
fi
}
TMP_DIR=$(mktemp -d)
cleanup() {
rm -rf "$TMP_DIR"
}
trap cleanup EXIT
WORKTREE="$TMP_DIR/worktree"
BIN_DIR="$TMP_DIR/bin"
mkdir -p "$WORKTREE/scripts/system-maintenance/bin" "$BIN_DIR"
cp "$TARGET_SCRIPT" "$WORKTREE/scripts/system-maintenance/bin/hosts-file-monitor.sh"
cat >"$BIN_DIR/tee" <<'EOF'
#!/bin/bash
while IFS= read -r _; do
:
done
EOF
chmod +x "$BIN_DIR/tee"
cat >"$BIN_DIR/sleep" <<'EOF'
#!/bin/bash
printf '%s\n' "$1" >> "${SLEEP_LOG:?}"
exit 99
EOF
chmod +x "$BIN_DIR/sleep"
cat >"$BIN_DIR/inotifywait" <<'EOF'
#!/bin/bash
while IFS= read -r line; do
printf '%s\n' "$line"
done <<< "${MOCK_INOTIFY_OUTPUT:-}"
EOF
chmod +x "$BIN_DIR/inotifywait"
run_shell() {
env -i PATH="$BIN_DIR" HOSTS_FILE_MONITOR_SKIP_MAIN=1 /bin/bash -c "$1"
}
make_hosts_file() {
local file_path="$1"
local include_custom="$2"
local include_stevenblack="$3"
local i
: >"$file_path"
for ((i = 1; i <= 1005; i++)); do
printf '127.0.0.1 example-%d.test\n' "$i" >>"$file_path"
done
if [[ $include_custom -eq 1 ]]; then
printf '# Custom blocking entries\n' >>"$file_path"
fi
if [[ $include_stevenblack -eq 1 ]]; then
printf '# StevenBlack hosts\n' >>"$file_path"
fi
}
printf 'Checking intact hosts files are accepted...\n'
hosts_ok="$TMP_DIR/hosts-ok"
make_hosts_file "$hosts_ok" 1 1
ok_result=$(run_shell "source '$WORKTREE/scripts/system-maintenance/bin/hosts-file-monitor.sh'; HOSTS_FILE='$hosts_ok'; if needs_restoration; then printf restore; else printf ok; fi")
assert_equals 'ok' "$ok_result" 'needs_restoration should accept intact hosts files'
printf 'Checking missing markers trigger restoration...\n'
hosts_missing="$TMP_DIR/hosts-missing"
make_hosts_file "$hosts_missing" 1 0
missing_result=$(run_shell "source '$WORKTREE/scripts/system-maintenance/bin/hosts-file-monitor.sh'; HOSTS_FILE='$hosts_missing'; if needs_restoration; then printf restore; else printf ok; fi")
assert_equals 'restore' "$missing_result" 'needs_restoration should reject files missing required markers'
printf 'Checking inotify path is preferred when available...\n'
inotify_mode=$(run_shell "source '$WORKTREE/scripts/system-maintenance/bin/hosts-file-monitor.sh'; monitor_with_inotify() { printf inotify; }; monitor_with_polling() { printf polling; }; start_monitoring")
assert_equals 'inotify' "$inotify_mode" 'start_monitoring should prefer inotifywait when present'
printf 'Checking polling fallback is used without inotifywait...\n'
mv "$BIN_DIR/inotifywait" "$BIN_DIR/inotifywait.off"
poll_mode=$(run_shell "source '$WORKTREE/scripts/system-maintenance/bin/hosts-file-monitor.sh'; monitor_with_inotify() { printf inotify; }; monitor_with_polling() { printf polling; }; start_monitoring")
mv "$BIN_DIR/inotifywait.off" "$BIN_DIR/inotifywait"
assert_equals 'polling' "$poll_mode" 'start_monitoring should fall back to polling when inotifywait is absent'
printf 'hosts-file-monitor.sh regression checks passed.\n'