#!/bin/sh
# 40-sysctl.sh — Apply kernel parameters required for K8s networking

# Apply all .conf files in sysctl.d
for conf in /etc/sysctl.d/*.conf; do
    [ -f "$conf" ] || continue
    while IFS='=' read -r key value; do
        case "$key" in
            '#'*|'') continue ;;
        esac
        # NOTE: do NOT use tr -d '[:space:]' — see 30-kernel-modules.sh for the
        # rationale. Use explicit whitespace chars so this works under
        # Ubuntu's busybox-static tr too.
        key="$(printf '%s' "$key" | tr -d ' \t\r\n')"
        value="$(printf '%s' "$value" | tr -d ' \t\r\n')"
        if [ -n "$key" ] && [ -n "$value" ]; then
            sysctl -w "${key}=${value}" >/dev/null 2>&1 || \
                log_warn "Failed to set sysctl: ${key}=${value}"
        fi
    done < "$conf"
done

log_ok "Sysctl settings applied"