tests/int: add a test for host mntns vs hooks

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

tests/integration/host-mntns.bats

@@ -0,0 +1,33 @@
+#!/usr/bin/env bats
+
+load helpers
+
+function setup() {
+	requires root
+	setup_busybox
+}
+
+function teardown() {
+	[ ! -v ROOT ] && return 0 # nothing to teardown
+
+	# XXX runc does not unmount a container which
+	# shares mount namespace with the host.
+	umount -R --lazy "$ROOT"/bundle/rootfs
+
+	teardown_bundle
+}
+
+@test "runc run [host mount ns + hooks]" {
+	update_config '	  .process.args = ["/bin/echo", "Hello World"]
+			| .hooks |= . + {"createRuntime": [{"path": "/bin/sh", "args": ["/bin/sh", "-c", "touch createRuntimeHook.$$"]}]}
+			| .linux.namespaces -= [{"type": "mount"}]
+			| .linux.maskedPaths = []
+			| .linux.readonlyPaths = []'
+	runc run test_host_mntns
+	[ "$status" -eq 0 ]
+	runc delete -f test_host_mntns
+
+	# There should be one such file.
+	run -0 ls createRuntimeHook.*
+	[ "$(echo "$output" | wc -w)" -eq 1 ]
+}