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// Copyright 2022 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testing
import (
"fmt"
"os"
"os/exec"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// This won't run automatically because of the filename of this file, but it is
// exported and tests from other packages are meant to call it directly.
func TestZombieProcessLeaking(t *testing.T) {
// Test that we don't leave behind any zombies after a test run.
// Perform a sanity check first. Make a zombie process so that we can
// verify that our detection works.
cmd := exec.Command("true")
require.NoError(t, cmd.Start())
require.Eventually(t, func() bool {
_, _, result := zombieProcessesPresent()
return result
},
10*time.Second,
100*time.Millisecond,
"Zombie detection doesn't work. Perhaps ps works differently on this platform?",
)
require.NoError(t, cmd.Wait())
// This is not primarily to enable parallalism, but to move the test to
// the end of the run, since Go executes all parallel tests at the
// end. This doesn't guarantee that it's the last one though, since we
// can execute at the same time as the others.
t.Parallel()
var output string
var err error
// Use Eventually(), since we aren't guaranteed to be the last test.
assert.Eventuallyf(t, func() bool {
var result bool
output, err, result = zombieProcessesPresent()
return !result
},
60*time.Second,
1*time.Second,
"Zombie processes are still present! Missing Wait()?",
)
if t.Failed() {
t.Logf("ps output: %s, error: %v", output, err)
}
}
func zombieProcessesPresent() (string, error, bool) {
cmdStr := fmt.Sprintf("ps -ef | grep %d | grep '<defunct>' | grep -v grep", os.Getpid())
cmd := exec.Command("/bin/sh", "-c", cmdStr)
output, err := cmd.Output()
if err == nil {
return string(output), err, true
} else {
return string(output), err, false
}
}
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