#!/bin/bash
#
# Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
#
# This library is free software; you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; version 2.1 of the License.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA

TEST_DESC="UST - Namespace contexts change"

CURDIR=$(dirname "$0")/
TESTDIR=$CURDIR/../../..

TESTAPP_PATH="$TESTDIR/utils/testapp"
TESTAPP_NAME="gen-ust-events-ns"
TESTAPP_BIN="$TESTAPP_PATH/$TESTAPP_NAME/$TESTAPP_NAME"
NUM_EVENT=1000
EVENT_NAME="tp:tptest"

TESTS_PER_NS=16

NUM_TESTS=$((TESTS_PER_NS * 5))

source "$TESTDIR/utils/utils.sh"

# MUST set TESTDIR before calling those functions

function test_ns()
{
	local ns=$1

	local session_name="${ns}_ns"
	local chan_name="${ns}_ns"
	local context_name="${ns}_ns"

	local trace_path
	local ns_inode
	local file_sync_before_last
	local file_sync_after_unshare

	# Check if the kernel has support for this ns type
	if [ ! -f "/proc/$$/ns/$ns" ]; then
		skip 0 "System has no $ns namespace support" $TESTS_PER_NS
		return
	fi

	# Get the current ns inode number
	ns_inode=$(stat -c '%i' -L "/proc/$$/ns/$ns")
	ok $? "Get current $ns namespace inode: $ns_inode" || ns_inode="invalid"

	trace_path=$(mktemp -d)
	file_sync_before_last=$(mktemp -u)
	file_sync_after_unshare=$(mktemp -u)

	start_lttng_sessiond

	create_lttng_session_ok "$session_name" "$trace_path"
	enable_ust_lttng_channel_ok "$session_name" "$chan_name"
	add_context_ust_ok "$session_name" "$chan_name" "$context_name"
	enable_ust_lttng_event_ok "$session_name" "$EVENT_NAME" "$chan_name"
	start_lttng_tracing_ok "$session_name"

	$TESTAPP_BIN -n "$ns" -i $NUM_EVENT -a "$file_sync_after_unshare" -b "$file_sync_before_last" &
	app_pid=$!

	# Let the app do it's thing before entering the synchronisation loop
	sleep 0.5

	while [ ! -f "$file_sync_after_unshare" ]; do
		# Break if the app failed / died
		if [ ! -f "/proc/$app_pid" ]; then
			break
		fi
		echo "# Waiting for app..."
		sleep 0.5
	done

	app_ns_inode=$(stat -c '%i' -L "/proc/$app_pid/ns/$ns")
	ok $? "Get current $ns namespace inode: $app_ns_inode" || app_ns_inode="invalid"

	test "$ns_inode" != "invalid" && test "$app_ns_inode" != "invalid" && test "$ns_inode" != "$app_ns_inode"
	ok $? "Reported namespace inode changed after unshare"

	touch "$file_sync_before_last"

	# stop and destroy
	stop_lttng_tracing_ok "$session_name"
	destroy_lttng_session_ok "$session_name"
	stop_lttng_sessiond

	# Check that the events contain the right namespace inode number
	validate_trace_count "${ns}_ns = $ns_inode" "$trace_path" $NUM_EVENT
	validate_trace_count "${ns}_ns = $app_ns_inode" "$trace_path" $NUM_EVENT

	rm -rf "$trace_path"
	rm -f "$file_sync_before_last"
	rm -f "$file_sync_after_unshare"
}


plan_tests $NUM_TESTS

print_test_banner "$TEST_DESC"

isroot=0
if [ "$(id -u)" == "0" ]; then
	isroot=1
fi

skip $isroot "Root access is needed. Skipping all tests." "$NUM_TESTS" && exit 0

system_has_ns=0
if [ -d "/proc/$$/ns" ]; then
	system_has_ns=1
fi

skip $system_has_ns "System has no namespaces support" $NUM_TESTS && exit 0


test_ns cgroup
test_ns ipc
test_ns mnt
test_ns net
#test_ns pid # pid_ns is special, can't be changed that way
#test_ns user # user_ns can only be change when the app is single threaded, this is always false for an ust instrumented app
test_ns uts