migrate away from deprecated ioutil APIs (#7175)

Co-authored-by: Callum Waters <cmwaters19@gmail.com>
Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

test/e2e/app/snapshots.go

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"math"
 	"os"
 	"path/filepath"
@@ -48,7 +47,7 @@ func (s *SnapshotStore) loadMetadata() error {
 	file := filepath.Join(s.dir, "metadata.json")
 	metadata := []abci.Snapshot{}
 
-	bz, err := ioutil.ReadFile(file)
+	bz, err := os.ReadFile(file)
 	switch {
 	case errors.Is(err, os.ErrNotExist):
 	case err != nil:
@@ -75,7 +74,7 @@ func (s *SnapshotStore) saveMetadata() error {
 	// save the file to a new file and move it to make saving atomic.
 	newFile := filepath.Join(s.dir, "metadata.json.new")
 	file := filepath.Join(s.dir, "metadata.json")
-	err = ioutil.WriteFile(newFile, bz, 0644) // nolint: gosec
+	err = os.WriteFile(newFile, bz, 0644) // nolint: gosec
 	if err != nil {
 		return err
 	}
@@ -96,7 +95,7 @@ func (s *SnapshotStore) Create(state *State) (abci.Snapshot, error) {
 		Hash:   hashItems(state.Values),
 		Chunks: byteChunks(bz),
 	}
-	err = ioutil.WriteFile(filepath.Join(s.dir, fmt.Sprintf("%v.json", state.Height)), bz, 0644)
+	err = os.WriteFile(filepath.Join(s.dir, fmt.Sprintf("%v.json", state.Height)), bz, 0644)
 	if err != nil {
 		return abci.Snapshot{}, err
 	}
@@ -146,7 +145,7 @@ func (s *SnapshotStore) LoadChunk(height uint64, format uint32, chunk uint32) ([
 	defer s.RUnlock()
 	for _, snapshot := range s.metadata {
 		if snapshot.Height == height && snapshot.Format == format {
-			bz, err := ioutil.ReadFile(filepath.Join(s.dir, fmt.Sprintf("%v.json", height)))
+			bz, err := os.ReadFile(filepath.Join(s.dir, fmt.Sprintf("%v.json", height)))
 			if err != nil {
 				return nil, err
 			}

test/e2e/app/state.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"sort"
 	"sync"
@@ -45,7 +44,7 @@ func NewState(file string, persistInterval uint64) (*State, error) {
 // load loads state from disk. It does not take out a lock, since it is called
 // during construction.
 func (s *State) load() error {
-	bz, err := ioutil.ReadFile(s.file)
+	bz, err := os.ReadFile(s.file)
 	if err != nil {
 		return fmt.Errorf("failed to read state from %q: %w", s.file, err)
 	}
@@ -66,7 +65,7 @@ func (s *State) save() error {
 	// We write the state to a separate file and move it to the destination, to
 	// make it atomic.
 	newFile := fmt.Sprintf("%v.new", s.file)
-	err = ioutil.WriteFile(newFile, bz, 0644)
+	err = os.WriteFile(newFile, bz, 0644)
 	if err != nil {
 		return fmt.Errorf("failed to write state to %q: %w", s.file, err)
 	}

test/e2e/runner/evidence.go

@@ -5,8 +5,8 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
+	"os"
 	"path/filepath"
 	"time"
 
@@ -232,7 +232,7 @@ func getRandomValidatorIndex(privVals []types.MockPV, vals *types.ValidatorSet)
 }
 
 func readPrivKey(keyFilePath string) (crypto.PrivKey, error) {
-	keyJSONBytes, err := ioutil.ReadFile(keyFilePath)
+	keyJSONBytes, err := os.ReadFile(keyFilePath)
 	if err != nil {
 		return nil, err
 	}

test/e2e/runner/setup.go

@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -51,7 +50,7 @@ func Setup(testnet *e2e.Testnet) error {
 	if err != nil {
 		return err
 	}
-	err = ioutil.WriteFile(filepath.Join(testnet.Dir, "docker-compose.yml"), compose, 0644)
+	err = os.WriteFile(filepath.Join(testnet.Dir, "docker-compose.yml"), compose, 0644)
 	if err != nil {
 		return err
 	}
@@ -92,7 +91,7 @@ func Setup(testnet *e2e.Testnet) error {
 		if err != nil {
 			return err
 		}
-		err = ioutil.WriteFile(filepath.Join(nodeDir, "config", "app.toml"), appCfg, 0644)
+		err = os.WriteFile(filepath.Join(nodeDir, "config", "app.toml"), appCfg, 0644)
 		if err != nil {
 			return err
 		}
@@ -410,11 +409,11 @@ func UpdateConfigStateSync(node *e2e.Node, height int64, hash []byte) error {
 
 	// FIXME Apparently there's no function to simply load a config file without
 	// involving the entire Viper apparatus, so we'll just resort to regexps.
-	bz, err := ioutil.ReadFile(cfgPath)
+	bz, err := os.ReadFile(cfgPath)
 	if err != nil {
 		return err
 	}
 	bz = regexp.MustCompile(`(?m)^trust-height =.*`).ReplaceAll(bz, []byte(fmt.Sprintf(`trust-height = %v`, height)))
 	bz = regexp.MustCompile(`(?m)^trust-hash =.*`).ReplaceAll(bz, []byte(fmt.Sprintf(`trust-hash = "%X"`, hash)))
-	return ioutil.WriteFile(cfgPath, bz, 0644)
+	return os.WriteFile(cfgPath, bz, 0644)
 }