test/others: check external network namespaces

Acked-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/others/netns_ext/Makefile

+run:
+	./run.sh

test/others/netns_ext/_run.sh

+echo $$ > $1
+while :; do
+	sleep 1
+done

test/others/netns_ext/run.sh

+#!/bin/bash
+
+set -e
+
+CRIU=../../../criu/criu
+setsid unshare -n bash -c 'unshare -n sh _run.sh pidfile2 & unshare -n sh _run.sh pidfile3 & ip link add xxx type veth && ip link add mymacvlan1 link xxx type macvlan mode bridge && . _run.sh pidfile' < /dev/zero &> output &
+sleep 1
+while :; do
+	test -f pidfile && test -f pidfile2 && break;
+	sleep 0.1
+done
+
+pid=$(cat pidfile)
+pid2=$(cat pidfile2)
+
+touch test_netns
+mount --bind /proc/$pid/ns/net test_netns
+touch test_netns2
+mount --bind /proc/$pid2/ns/net test_netns2
+mkdir -p images
+ino=$(ls -iL test_netns | awk '{ print $1 }')
+ino2=$(ls -iL test_netns2 | awk '{ print $1 }')
+exec 33< test_netns
+exec 34< test_netns2
+$CRIU dump -t $pid -o dump.log -D images --external net[$ino]:test_netns --external net[$ino2]:test_netns2
+cat images/dump.log | grep -B 5 Error || echo ok
+$CRIU restore -o restore.log -D images --inherit-fd fd[33]:test_netns --inherit-fd fd[34]:test_netns2 -d
+cat images/restore.log | grep -B 5 Error || echo ok
+new_ino=$(ls -iL /proc/$pid/ns/net | awk '{ print $1 }')
+new_ino2=$(ls -iL /proc/$pid2/ns/net | awk '{ print $1 }')
+[ "$ino" -ne "$new_ino" ] && {
+	echo FAIL
+	exit 1
+}
+[ "$ino2" -ne "$new_ino2" ] && {
+	echo FAIL
+	exit 1
+}
+echo PASS
+exit 0