Handle IPv6-less hosts in ip6tables shim

qbittorrent/rootfs/usr/local/sbin/sysctl

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REAL_SYSCTL="/sbin/sysctl"
+if [[ ! -x "${REAL_SYSCTL}" ]]; then
+    REAL_SYSCTL="/usr/sbin/sysctl"
+fi
+
+if [[ "$#" -ge 2 && "$1" == "-q" && "$2" == "net.ipv4.conf.all.src_valid_mark=1" ]]; then
+    if "${REAL_SYSCTL}" "$@" >/dev/null 2>&1; then
+        exit 0
+    fi
+    # Suppress failure for this specific key to keep wg-quick from aborting in unprivileged environments.
+    exit 0
+fi
+
+exec "${REAL_SYSCTL}" "$@"