chore: remove refs to deprecated io/ioutil

pkg/custompluginmonitor/custom_plugin_monitor.go

@@ -18,7 +18,7 @@ package custompluginmonitor
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"time"
 
 	"github.com/golang/glog"
@@ -57,7 +57,7 @@ func NewCustomPluginMonitorOrDie(configPath string) types.Monitor {
 		configPath: configPath,
 		tomb:       tomb.NewTomb(),
 	}
-	f, err := ioutil.ReadFile(configPath)
+	f, err := os.ReadFile(configPath)
 	if err != nil {
 		glog.Fatalf("Failed to read configuration file %q: %v", configPath, err)
 	}

pkg/custompluginmonitor/plugin/plugin.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os/exec"
 	"strings"
 	"sync"
@@ -132,12 +131,12 @@ func (p *Plugin) runRules() {
 // readFromReader reads the maxBytes from the reader and drains the rest.
 func readFromReader(reader io.ReadCloser, maxBytes int64) ([]byte, error) {
 	limitReader := io.LimitReader(reader, maxBytes)
-	data, err := ioutil.ReadAll(limitReader)
+	data, err := io.ReadAll(limitReader)
 	if err != nil {
 		return []byte{}, err
 	}
 	// Drain the reader
-	if _, err := io.Copy(ioutil.Discard, reader); err != nil {
+	if _, err := io.Copy(io.Discard, reader); err != nil {
 		return []byte{}, err
 	}
 	return data, nil

pkg/exporters/k8sexporter/problemclient/configs.go

@@ -16,8 +16,8 @@ package problemclient
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net/url"
+	"os"
 	"strconv"
 
 	"k8s.io/apimachinery/pkg/runtime/schema"
@@ -137,7 +137,7 @@ func getKubeClientConfig(uri *url.URL) (*kube_rest.Config, error) {
 
 	if useServiceAccount {
 		// If a readable service account token exists, then use it
-		if contents, err := ioutil.ReadFile(defaultServiceAccountFile); err == nil {
+		if contents, err := os.ReadFile(defaultServiceAccountFile); err == nil {
 			kubeConfig.BearerToken = string(contents)
 		}
 	}

pkg/exporters/stackdriver/stackdriver_exporter.go

@@ -18,7 +18,7 @@ package stackdriverexporter
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"reflect"
 	"time"
@@ -209,7 +209,7 @@ func NewExporterOrDie(clo types.CommandLineOptions) types.Exporter {
 	se := stackdriverExporter{}
 
 	// Apply configurations.
-	f, err := ioutil.ReadFile(options.configPath)
+	f, err := os.ReadFile(options.configPath)
 	if err != nil {
 		glog.Fatalf("Failed to read configuration file %q: %v", options.configPath, err)
 	}

pkg/systemlogmonitor/log_monitor.go

@@ -18,7 +18,7 @@ package systemlogmonitor
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"time"
 
 	"github.com/golang/glog"
@@ -62,7 +62,7 @@ func NewLogMonitorOrDie(configPath string) types.Monitor {
 		tomb:       tomb.NewTomb(),
 	}
 
-	f, err := ioutil.ReadFile(configPath)
+	f, err := os.ReadFile(configPath)
 	if err != nil {
 		glog.Fatalf("Failed to read configuration file %q: %v", configPath, err)
 	}

pkg/systemlogmonitor/logwatchers/filelog/log_watcher_test.go

@@ -17,7 +17,6 @@ limitations under the License.
 package filelog
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 	"time"
@@ -139,7 +138,7 @@ Jan  2 03:04:05 kernel: [2.000000] 3
 	}
 	for c, test := range testCases {
 		t.Logf("TestCase #%d: %#v", c+1, test)
-		f, err := ioutil.TempFile("", "log_watcher_test")
+		f, err := os.CreateTemp("", "log_watcher_test")
 		assert.NoError(t, err)
 		defer func() {
 			f.Close()

pkg/systemstatsmonitor/net_collector_test.go

@@ -1,7 +1,6 @@
 package systemstatsmonitor
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"regexp"
@@ -48,12 +47,8 @@ func newFakeInt64Metric(metricID metrics.MetricID, viewName string, description
 // testCollectAux is a test auxiliary function used for testing netCollector.Collect
 func testCollectAux(t *testing.T, name string, excludeInterfaceRegexp ssmtypes.NetStatsInterfaceRegexp, validate func(*testing.T, *netCollector)) {
 	// mkdir /tmp/proc-X
-	procDir, err := ioutil.TempDir(os.TempDir(), "proc-")
-	if err != nil {
-		t.Fatalf("Failed to create temp proc directory: %v", err)
-	}
-	// rm -r /tmp/proc-X
-	defer os.RemoveAll(procDir)
+	procDir := t.TempDir()
+
 	// mkdir -C /tmp/proc-X/net
 	procNetDir := path.Join(procDir, "net")
 	if err := os.Mkdir(procNetDir, 0777); err != nil {

pkg/systemstatsmonitor/osfeature_collector.go

@@ -15,7 +15,7 @@ package systemstatsmonitor
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -102,7 +102,7 @@ func (ofc *osFeatureCollector) recordFeaturesFromCmdline(cmdlineArgs []system.Cm
 func (ofc *osFeatureCollector) recordFeaturesFromModules(modules []system.Module) {
 	// Collect known modules (default modules based on guest OS present in known-modules.json)
 	var knownModules []system.Module
-	f, err := ioutil.ReadFile(ofc.config.KnownModulesConfigPath)
+	f, err := os.ReadFile(ofc.config.KnownModulesConfigPath)
 	if err != nil {
 		glog.Warningf("Failed to read configuration file %s: %v",
 			ofc.config.KnownModulesConfigPath, err)

pkg/systemstatsmonitor/system_stats_monitor.go

@@ -18,7 +18,7 @@ package systemstatsmonitor
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"time"
 
@@ -58,7 +58,7 @@ func NewSystemStatsMonitorOrDie(configPath string) types.Monitor {
 	}
 
 	// Apply configurations.
-	f, err := ioutil.ReadFile(configPath)
+	f, err := os.ReadFile(configPath)
 	if err != nil {
 		glog.Fatalf("Failed to read configuration file %q: %v", configPath, err)
 	}

pkg/util/metrics/helpers_test.go

@@ -16,7 +16,7 @@ limitations under the License.
 package metrics
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 )
 
@@ -121,7 +121,7 @@ func TestPrometheusMetricsParsingAndMatching(t *testing.T) {
 
 	for _, test := range testCases {
 		t.Run(test.name, func(t *testing.T) {
-			b, err := ioutil.ReadFile(test.metricsTextPath)
+			b, err := os.ReadFile(test.metricsTextPath)
 			if err != nil {
 				t.Errorf("Unexpected error reading file %s: %v", test.metricsTextPath, err)
 			}

pkg/util/nethealth/nethealth.go

@@ -28,7 +28,7 @@ import (
 	"crypto/sha512"
 	"encoding/hex"
 	"flag"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"strings"
@@ -92,7 +92,7 @@ func main() {
 	if res.ContentLength != objectLength {
 		log.Fatalf("Length reported (%d) is not equal to expected length (%d)", res.ContentLength, objectLength)
 	}
-	blobData, err := ioutil.ReadAll(res.Body)
+	blobData, err := io.ReadAll(res.Body)
 	res.Body.Close()
 	if err != nil {
 		log.Fatal("Failed to read full content", err)
@@ -110,7 +110,7 @@ func main() {
 	if err != nil {
 		log.Fatalf("Failure (%s) while reading %s", err, objectHashUrl)
 	}
-	content, err := ioutil.ReadAll(res.Body)
+	content, err := io.ReadAll(res.Body)
 	res.Body.Close()
 	if err != nil {
 		log.Fatal("Failed to read full content of hash file", err)