Lint: ioutil is deprecated, I have the power of search and replace

.golangci.yml

@@ -62,8 +62,6 @@ issues:
     - ineffective break statement. Did you mean to break out of the outer loop
     # revive: irrelevant error about naming
     - "var-naming: don't use leading k in Go names"
-    # staticcheck: we'll keep using ioutil for now
-    - 'SA1019: "io/ioutil" has been deprecated since Go 1.16'
 
   exclude-rules:
     # Add all linters here -- Comment this block out for testing linters

agreement/fuzzer/tests_test.go

@@ -20,7 +20,6 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"math"
 	"math/rand"
@@ -440,7 +439,7 @@ func TestFuzzer(t *testing.T) {
 		t.Run(testName, func(t *testing.T) {
 			partitiontest.PartitionTest(t) // Check if this expect test should by run, may SKIP
 			jsonFilename := jsonFiles[testName]
-			jsonBytes, err := ioutil.ReadFile(jsonFilename)
+			jsonBytes, err := os.ReadFile(jsonFilename)
 			require.NoError(t, err)
 			var fuzzerTest FuzzerTestFile
 			err = json.Unmarshal(jsonBytes, &fuzzerTest)

cmd/algod/main.go

@@ -19,7 +19,6 @@ package main
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -119,7 +118,7 @@ func run() int {
 	}
 
 	// Load genesis
-	genesisText, err := ioutil.ReadFile(genesisPath)
+	genesisText, err := os.ReadFile(genesisPath)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Cannot read genesis file %s: %v\n", genesisPath, err)
 		return 1

cmd/algod/main_test.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -30,15 +29,15 @@ import (
 
 func BenchmarkAlgodStartup(b *testing.B) {
 	tmpDir := b.TempDir()
-	genesisFile, err := ioutil.ReadFile("../../installer/genesis/devnet/genesis.json")
+	genesisFile, err := os.ReadFile("../../installer/genesis/devnet/genesis.json")
 	require.NoError(b, err)
 
 	dataDirectory = &tmpDir
 	bInitAndExit := true
 	initAndExit = &bInitAndExit
 	b.StartTimer()
 	for n := 0; n < b.N; n++ {
-		err := ioutil.WriteFile(filepath.Join(tmpDir, config.GenesisJSONFile), genesisFile, 0766)
+		err := os.WriteFile(filepath.Join(tmpDir, config.GenesisJSONFile), genesisFile, 0766)
 		require.NoError(b, err)
 		fmt.Printf("file %s was written\n", filepath.Join(tmpDir, config.GenesisJSONFile))
 		run()

cmd/algofix/main.go

@@ -13,7 +13,7 @@ import (
 	"go/parser"
 	"go/scanner"
 	"go/token"
-	"io/ioutil"
+	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -135,7 +135,7 @@ func processFile(filename string, useStdin bool) error {
 		defer f.Close()
 	}
 
-	src, err := ioutil.ReadAll(f)
+	src, err := io.ReadAll(f)
 	if err != nil {
 		return err
 	}
@@ -209,7 +209,7 @@ func processFile(filename string, useStdin bool) error {
 	}
 
 	fixedSome = true
-	return ioutil.WriteFile(f.Name(), newSrc, 0)
+	return os.WriteFile(f.Name(), newSrc, 0)
 }
 
 var gofmtBuf bytes.Buffer
@@ -248,7 +248,7 @@ func isGoFile(f os.FileInfo) bool {
 }
 
 func writeTempFile(dir, prefix string, data []byte) (string, error) {
-	file, err := ioutil.TempFile(dir, prefix)
+	file, err := os.CreateTemp(dir, prefix)
 	if err != nil {
 		return "", err
 	}

cmd/algofix/typecheck.go

@@ -9,7 +9,6 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -161,12 +160,12 @@ func typecheck(cfg *TypeConfig, f *ast.File) (typeof map[interface{}]string, ass
 			if err != nil {
 				return err
 			}
-			dir, err := ioutil.TempDir(os.TempDir(), "fix_cgo_typecheck")
+			dir, err := os.MkdirTemp(os.TempDir(), "fix_cgo_typecheck")
 			if err != nil {
 				return err
 			}
 			defer os.RemoveAll(dir)
-			err = ioutil.WriteFile(filepath.Join(dir, "in.go"), txt, 0600)
+			err = os.WriteFile(filepath.Join(dir, "in.go"), txt, 0600)
 			if err != nil {
 				return err
 			}
@@ -175,7 +174,7 @@ func typecheck(cfg *TypeConfig, f *ast.File) (typeof map[interface{}]string, ass
 			if err != nil {
 				return err
 			}
-			out, err := ioutil.ReadFile(filepath.Join(dir, "_cgo_gotypes.go"))
+			out, err := os.ReadFile(filepath.Join(dir, "_cgo_gotypes.go"))
 			if err != nil {
 				return err
 			}

cmd/algoh/main.go

@@ -19,7 +19,6 @@ package main
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"os/signal"
@@ -351,8 +350,8 @@ func captureErrorLogs(algohConfig algoh.HostConfig, errorOutput stdCollector, ou
 		log.EventWithDetails(telemetryspec.HostApplicationState, telemetryspec.ErrorOutputEvent, details)
 
 		// Write stdout & stderr streams to disk
-		_ = ioutil.WriteFile(filepath.Join(absolutePath, nodecontrol.StdOutFilename), []byte(output.output), os.ModePerm)
-		_ = ioutil.WriteFile(filepath.Join(absolutePath, nodecontrol.StdErrFilename), []byte(errorOutput.output), os.ModePerm)
+		_ = os.WriteFile(filepath.Join(absolutePath, nodecontrol.StdOutFilename), []byte(output.output), os.ModePerm)
+		_ = os.WriteFile(filepath.Join(absolutePath, nodecontrol.StdErrFilename), []byte(errorOutput.output), os.ModePerm)
 	}
 	if errorCondition && algohConfig.UploadOnError {
 		fmt.Fprintf(os.Stdout, "Uploading logs...\n")

cmd/algokey/common.go

@@ -18,7 +18,7 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"os"
 
 	"github.com/algorand/go-algorand/crypto"
@@ -63,7 +63,7 @@ func loadMnemonic(mnemonic string) crypto.Seed {
 }
 
 func loadKeyfile(keyfile string) crypto.Seed {
-	seedbytes, err := ioutil.ReadFile(keyfile)
+	seedbytes, err := os.ReadFile(keyfile)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Cannot read key seed from %s: %v\n", keyfile, err)
 		os.Exit(1)
@@ -75,7 +75,7 @@ func loadKeyfile(keyfile string) crypto.Seed {
 }
 
 func writePrivateKey(keyfile string, seed crypto.Seed) {
-	err := ioutil.WriteFile(keyfile, seed[:], 0600)
+	err := os.WriteFile(keyfile, seed[:], 0600)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Cannot write key to %s: %v\n", keyfile, err)
 		os.Exit(1)
@@ -84,7 +84,7 @@ func writePrivateKey(keyfile string, seed crypto.Seed) {
 
 func writePublicKey(pubkeyfile string, checksummed string) {
 	data := fmt.Sprintf("%s\n", checksummed)
-	err := ioutil.WriteFile(pubkeyfile, []byte(data), 0666)
+	err := os.WriteFile(pubkeyfile, []byte(data), 0666)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Cannot write public key to %s: %v\n", pubkeyfile, err)
 		os.Exit(1)
@@ -100,7 +100,7 @@ func computeMnemonic(seed crypto.Seed) string {
 	return mnemonic
 }
 
-// writeFile is a wrapper of ioutil.WriteFile which considers the special
+// writeFile is a wrapper of os.WriteFile which considers the special
 // case of stdout filename
 func writeFile(filename string, data []byte, perm os.FileMode) error {
 	var err error
@@ -111,14 +111,14 @@ func writeFile(filename string, data []byte, perm os.FileMode) error {
 		}
 		return nil
 	}
-	return ioutil.WriteFile(filename, data, perm)
+	return os.WriteFile(filename, data, perm)
 }
 
-// readFile is a wrapper of ioutil.ReadFile which considers the
+// readFile is a wrapper of os.ReadFile which considers the
 // special case of stdin filename
 func readFile(filename string) ([]byte, error) {
 	if filename == stdinFileNameValue {
-		return ioutil.ReadAll(os.Stdin)
+		return io.ReadAll(os.Stdin)
 	}
-	return ioutil.ReadFile(filename)
+	return os.ReadFile(filename)
 }

cmd/algokey/keyreg.go

@@ -20,7 +20,6 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -248,7 +247,7 @@ func run(params keyregCmdParams) error {
 			return fmt.Errorf("failed to write transaction to stdout: %w", err)
 		}
 	} else {
-		if err = ioutil.WriteFile(params.txFile, data, 0600); err != nil {
+		if err = os.WriteFile(params.txFile, data, 0600); err != nil {
 			return fmt.Errorf("failed to write transaction to '%s': %w", params.txFile, err)
 		}
 	}

cmd/algokey/multisig.go

@@ -19,7 +19,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -66,7 +65,7 @@ var multisigCmd = &cobra.Command{
 		seed := loadKeyfileOrMnemonic(multisigKeyfile, multisigMnemonic)
 		key := crypto.GenerateSignatureSecrets(seed)
 
-		txdata, err := ioutil.ReadFile(multisigTxfile)
+		txdata, err := os.ReadFile(multisigTxfile)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Cannot read transactions from %s: %v\n", multisigTxfile, err)
 			os.Exit(1)
@@ -101,7 +100,7 @@ var multisigCmd = &cobra.Command{
 			outBytes = append(outBytes, protocol.Encode(&stxn)...)
 		}
 
-		err = ioutil.WriteFile(multisigOutfile, outBytes, 0600)
+		err = os.WriteFile(multisigOutfile, outBytes, 0600)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Cannot write signed transactions to %s: %v\n", multisigOutfile, err)
 			os.Exit(1)

cmd/algokey/sign.go

@@ -19,7 +19,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -52,7 +51,7 @@ var signCmd = &cobra.Command{
 		seed := loadKeyfileOrMnemonic(signKeyfile, signMnemonic)
 		key := crypto.GenerateSignatureSecrets(seed)
 
-		txdata, err := ioutil.ReadFile(signTxfile)
+		txdata, err := os.ReadFile(signTxfile)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Cannot read transactions from %s: %v\n", signTxfile, err)
 			os.Exit(1)
@@ -78,7 +77,7 @@ var signCmd = &cobra.Command{
 			outBytes = append(outBytes, protocol.Encode(&stxn)...)
 		}
 
-		err = ioutil.WriteFile(signOutfile, outBytes, 0600)
+		err = os.WriteFile(signOutfile, outBytes, 0600)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Cannot write signed transactions to %s: %v\n", signOutfile, err)
 			os.Exit(1)

cmd/algons/dnsCmd.go

@@ -20,7 +20,6 @@ import (
 	"bufio"
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"regexp"
@@ -477,7 +476,7 @@ func doExportZone(network string, outputFilename string) bool {
 		return false
 	}
 	if outputFilename != "" {
-		err = ioutil.WriteFile(outputFilename, exportedZone, 0666)
+		err = os.WriteFile(outputFilename, exportedZone, 0666)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Unable to write exported zone file : %v\n", err)
 			return false

cmd/buildtools/genesis.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -102,7 +101,7 @@ var timestampCmd = &cobra.Command{
 			// Write out the genesis file in the same way we do to generate originally
 			// (see gen/generate.go)
 			jsonData := protocol.EncodeJSON(genesis)
-			err = ioutil.WriteFile(timestampFile, append(jsonData, '\n'), 0666)
+			err = os.WriteFile(timestampFile, append(jsonData, '\n'), 0666)
 			if err != nil {
 				reportErrorf("Error saving genesis file '%s': %v\n", timestampFile, err)
 			}
@@ -117,7 +116,7 @@ var dumpGenesisIDCmd = &cobra.Command{
 	Short: "Dump the genesis ID for the specified genesis file",
 	Run: func(cmd *cobra.Command, args []string) {
 		// Load genesis
-		genesisText, err := ioutil.ReadFile(genesisFile)
+		genesisText, err := os.ReadFile(genesisFile)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Cannot read genesis file %s: %v\n", genesisFile, err)
 			os.Exit(1)
@@ -139,7 +138,7 @@ var dumpGenesisHashCmd = &cobra.Command{
 	Short: "Dump the genesis Hash for the specified genesis file",
 	Run: func(cmd *cobra.Command, args []string) {
 		// Load genesis
-		genesisText, err := ioutil.ReadFile(genesisFile)
+		genesisText, err := os.ReadFile(genesisFile)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Cannot read genesis file %s: %v\n", genesisFile, err)
 			os.Exit(1)
@@ -206,7 +205,7 @@ var ensureCmd = &cobra.Command{
 			} else {
 				// Write source genesis (now updated with release timestamp, if applicable)
 				jsonData := protocol.EncodeJSON(sourceGenesis)
-				err = ioutil.WriteFile(targetFile, jsonData, 0666)
+				err = os.WriteFile(targetFile, jsonData, 0666)
 				if err != nil {
 					reportErrorf("Error writing target genesis file '%s': %v\n", targetFile, err)
 				}
@@ -231,13 +230,13 @@ func ensureReleaseGenesis(src bookkeeping.Genesis, releaseFile string) (err erro
 
 	releaseGenesis = src
 	jsonData := protocol.EncodeJSON(releaseGenesis)
-	err = ioutil.WriteFile(releaseFile, jsonData, 0666)
+	err = os.WriteFile(releaseFile, jsonData, 0666)
 	if err != nil {
 		return fmt.Errorf("error saving file: %v", err)
 	}
 
 	hash := releaseGenesis.Hash()
-	err = ioutil.WriteFile(releaseFileHash, []byte(hash.String()), 0666)
+	err = os.WriteFile(releaseFileHash, []byte(hash.String()), 0666)
 	if err != nil {
 		return fmt.Errorf("error saving hash file '%s': %v", releaseFileHash, err)
 	}
@@ -278,7 +277,7 @@ func verifyGenesisHashes(src, release bookkeeping.Genesis, hashFile string) (err
 		return fmt.Errorf("source and release hashes differ - genesis.json may have diverge from released version")
 	}
 
-	relHashBytes, err := ioutil.ReadFile(hashFile)
+	relHashBytes, err := os.ReadFile(hashFile)
 	if err != nil {
 		return fmt.Errorf("error loading release hash file '%s'", hashFile)
 	}