server,security: remove some deprecated ioutil usages

build/bazelutil/nogo_config.json

@@ -772,11 +772,6 @@
             "pkg/.*_generated\\.go$": "generated code",
             "pkg/roachprod/vm/aws/embedded\\.go$": "generated code",
             "pkg/security/securitytest/embedded\\.go$": "generated code",
-            "pkg/security/securityassets/security_assets.go$": "excluded until all uses of io/ioutil are replaced",
-            "pkg/security/securitytest/securitytest.go$": "excluded until all uses of io/ioutil are replaced",
-            "pkg/server/dumpstore/dumpstore.go$": "excluded until all uses of io/ioutil are replaced",
-            "pkg/server/dumpstore/dumpstore_test.go$": "excluded until all uses of io/ioutil are replaced",
-            "pkg/server/profiler/profilestore_test.go$": "excluded until all uses of io/ioutil are replaced",
             "pkg/util/bulk/tracing_aggregator.go$":"temporary exclusion until #100438 is resolved",
             "pkg/util/log/file_api.go$": "excluded until all uses of io/ioutil are replaced",
             "pkg/build/bazel/bazel\\.go$": "Runfile function deprecated"

pkg/security/securityassets/security_assets.go

@@ -6,7 +6,7 @@
 package securityassets
 
 import (
-	"io/ioutil"
+	"io/fs"
 	"os"
 
 	"github.com/cockroachdb/errors/oserror"
@@ -21,7 +21,7 @@ type Loader struct {
 
 // defaultLoader uses real filesystem calls.
 var defaultLoader = Loader{
-	ReadDir:  ioutil.ReadDir,
+	ReadDir:  readDir,
 	ReadFile: os.ReadFile,
 	Stat:     os.Stat,
 }
@@ -55,3 +55,23 @@ func (al Loader) FileExists(filename string) (bool, error) {
 	}
 	return true, nil
 }
+
+// readDir reads the directory named by dirname and returns a list of
+// fs.FileInfo for the directory's contents, sorted by filename. If an error
+// occurs reading the directory, ReadDir returns no directory entries along with
+// the error.
+func readDir(dirname string) ([]os.FileInfo, error) {
+	entries, err := os.ReadDir(dirname)
+	if err != nil {
+		return nil, err
+	}
+	infos := make([]fs.FileInfo, 0, len(entries))
+	for _, entry := range entries {
+		info, err := entry.Info()
+		if err != nil {
+			return nil, err
+		}
+		infos = append(infos, info)
+	}
+	return infos, nil
+}

pkg/server/dumpstore/dumpstore.go

@@ -7,7 +7,7 @@ package dumpstore
 
 import (
 	"context"
-	"io/ioutil"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"time"
@@ -85,11 +85,20 @@ func (s *DumpStore) GetFullPath(fileName string) string {
 func (s *DumpStore) GC(ctx context.Context, now time.Time, dumper Dumper) {
 	// NB: ioutil.ReadDir sorts the file names in ascending order.
 	// This brings the oldest files first.
-	files, err := ioutil.ReadDir(s.dir)
+	entries, err := os.ReadDir(s.dir)
 	if err != nil {
 		log.Dev.Warningf(ctx, "%v", err)
 		return
 	}
+	files := make([]fs.FileInfo, 0, len(entries))
+	for _, entry := range entries {
+		info, err := entry.Info()
+		if err != nil {
+			log.Dev.Warningf(ctx, "%v", err)
+			return
+		}
+		files = append(files, info)
+	}
 
 	maxS := s.maxCombinedFileSizeSetting.Get(&s.st.SV)
 

pkg/server/dumpstore/dumpstore_test.go

@@ -8,7 +8,7 @@ package dumpstore
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -187,9 +187,17 @@ func populate(t *testing.T, dirName string, fileNames []string, sizes []int64) [
 	}
 
 	// Retrieve the file list for the remainder of the test.
-	files, err := ioutil.ReadDir(dirName)
+	entries, err := os.ReadDir(dirName)
 	if err != nil {
 		t.Fatal(err)
 	}
+	files := make([]fs.FileInfo, 0, len(entries))
+	for _, entry := range entries {
+		info, err := entry.Info()
+		if err != nil {
+			t.Fatal(err)
+		}
+		files = append(files, info)
+	}
 	return files
 }

pkg/server/profiler/profilestore_test.go

@@ -8,7 +8,7 @@ package profiler
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"testing"
@@ -221,9 +221,17 @@ func populate(t *testing.T, dirName string, fileNames []string) []os.FileInfo {
 	}
 
 	// Retrieve the file list for the remainder of the test.
-	files, err := ioutil.ReadDir(dirName)
+	entries, err := os.ReadDir(dirName)
 	if err != nil {
 		t.Fatal(err)
 	}
+	files := make([]fs.FileInfo, 0, len(entries))
+	for _, entry := range entries {
+		info, err := entry.Info()
+		if err != nil {
+			t.Fatal(err)
+		}
+		files = append(files, info)
+	}
 	return files
 }