procfs_linux_test.go

Documentation: k8s.io/kubernetes/pkg/util/procfs

     1  //go:build linux
     2  // +build linux
     3  
     4  /*
     5  Copyright 2015 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package procfs
    21  
    22  import (
    23  	"os"
    24  	"os/signal"
    25  	"path/filepath"
    26  	"regexp"
    27  	"runtime"
    28  	"syscall"
    29  	"testing"
    30  	"time"
    31  
    32  	"github.com/stretchr/testify/assert"
    33  )
    34  
    35  func verifyContainerName(procCgroupText, expectedName string, expectedErr bool, t *testing.T) {
    36  	name, err := containerNameFromProcCgroup(procCgroupText)
    37  	if expectedErr && err == nil {
    38  		t.Errorf("Expected error but did not get error in verifyContainerName")
    39  		return
    40  	} else if !expectedErr && err != nil {
    41  		t.Errorf("Expected no error, but got error %+v in verifyContainerName", err)
    42  		return
    43  	} else if expectedErr {
    44  		return
    45  	}
    46  	if name != expectedName {
    47  		t.Errorf("Expected container name %s but got name %s", expectedName, name)
    48  	}
    49  }
    50  
    51  func TestContainerNameFromProcCgroup(t *testing.T) {
    52  	procCgroupValid := "2:devices:docker/kubelet"
    53  	verifyContainerName(procCgroupValid, "docker/kubelet", false, t)
    54  
    55  	procCgroupEmpty := ""
    56  	verifyContainerName(procCgroupEmpty, "", true, t)
    57  
    58  	content, err := os.ReadFile("example_proc_cgroup")
    59  	if err != nil {
    60  		t.Errorf("Could not read example /proc cgroup file")
    61  	}
    62  	verifyContainerName(string(content), "/user/1000.user/c1.session", false, t)
    63  
    64  	procCgroupNoDevice := "2:freezer:docker/kubelet\n5:cpuacct:pkg/kubectl"
    65  	verifyContainerName(procCgroupNoDevice, "", true, t)
    66  
    67  	procCgroupInvalid := "devices:docker/kubelet\ncpuacct:pkg/kubectl"
    68  	verifyContainerName(procCgroupInvalid, "", true, t)
    69  }
    70  
    71  func TestPidOf(t *testing.T) {
    72  	if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
    73  		t.Skipf("not supported on GOOS=%s", runtime.GOOS)
    74  	}
    75  	pids, err := PidOf(filepath.Base(os.Args[0]))
    76  	assert.Empty(t, err)
    77  	assert.NotZero(t, pids)
    78  	assert.Contains(t, pids, os.Getpid())
    79  }
    80  
    81  func TestPKill(t *testing.T) {
    82  	if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
    83  		t.Skipf("not supported on GOOS=%s", runtime.GOOS)
    84  	}
    85  	sig := syscall.SIGCONT
    86  	c := make(chan os.Signal, 1)
    87  	signal.Notify(c, sig)
    88  	defer signal.Stop(c)
    89  	PKill(os.Args[0], sig)
    90  	select {
    91  	case s := <-c:
    92  		if s != sig {
    93  			t.Fatalf("signal was %v, want %v", s, sig)
    94  		}
    95  	case <-time.After(1 * time.Second):
    96  		t.Fatalf("timeout waiting for %v", sig)
    97  	}
    98  }
    99  
   100  func BenchmarkGetPids(b *testing.B) {
   101  	if runtime.GOOS == "darwin" || runtime.GOOS == "windows" {
   102  		b.Skipf("not supported on GOOS=%s", runtime.GOOS)
   103  	}
   104  
   105  	re, err := regexp.Compile("(^|/)" + filepath.Base(os.Args[0]) + "$")
   106  	assert.Empty(b, err)
   107  
   108  	for i := 0; i < b.N; i++ {
   109  		pids := getPids(re)
   110  
   111  		b.StopTimer()
   112  		assert.NotZero(b, pids)
   113  		assert.Contains(b, pids, os.Getpid())
   114  		b.StartTimer()
   115  	}
   116  }
   117
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