DEBUG: check if br_netfilter is present

Author: swagatbora90

cmd/nerdctl/network/network_create_linux_test.go

@@ -190,9 +190,10 @@ func TestNetworkCreateICC(t *testing.T) {
 				helpers.Anyhow("network", "rm", data.Identifier())
 			},
 			Command: func(data test.Data, helpers test.Helpers) test.TestableCommand {
-				// DEBUG
-				iptablesSave := "iptables-save | grep CNI-ISOLATION || true"
-				helpers.Custom("sh", "-ec", iptablesSave).Run(&test.Expected{})
+				// DEBUG: Check br_netfilter module status
+				helpers.Custom("sh", "-ec", "lsmod | grep br_netfilter || echo 'br_netfilter not loaded'").Run(&test.Expected{})
+				helpers.Custom("sh", "-ec", "cat /proc/sys/net/bridge/bridge-nf-call-iptables 2>/dev/null || echo 'bridge-nf-call-iptables not available'").Run(&test.Expected{})
+				helpers.Custom("sh", "-ec", "ls /proc/sys/net/bridge/ 2>/dev/null || echo 'bridge sysctl not available'").Run(&test.Expected{})
 				// Try to ping the other container in the same network
 				// This should fail when ICC is disabled
 				return helpers.Command("run", "--rm", "--net", data.Identifier(),