drop go1.16 from test-matrix, replace deprecated io/ioutil, and update golangci-lint to v1.49.0

.circleci/config.yml

@@ -7,11 +7,6 @@ workflows:
   ci:
     jobs:
       - lint
-      - go/test:
-          name: test-golang-1.16
-          executor:
-            name: go/golang
-            tag:  1.16-alpine
       - go/test:
           name: test-golang-1.17
           executor:
@@ -55,8 +50,8 @@ jobs:
     steps:
     - checkout
     - go/install-golangci-lint:
-        prefix: v1.48.0
-        version: 1.48.0
+        prefix: v1.49.0
+        version: 1.49.0
     - go/install: {package: git}
     - run:
         name: Lint

.golangci.yml

@@ -32,7 +32,6 @@ linters:
   disable-all: true
   enable:
     - bodyclose
-    - deadcode
     - depguard
     - dogsled
     - errcheck
@@ -42,11 +41,9 @@ linters:
     - goconst
     - gofmt
     - goimports
-    - golint
     - gosimple
     - govet
     - ineffassign
-    - interfacer
     - lll
     - maintidx
     - misspell
@@ -56,13 +53,12 @@ linters:
     - nilnil
     - nolintlint
     - prealloc
+    - revive
     - staticcheck
-    - structcheck
     - stylecheck
     - typecheck
     - unconvert
     - unparam
     - unused
-    - varcheck
     - wastedassign
     - whitespace

assert/assert_ext_test.go

@@ -4,7 +4,7 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
+	"os"
 	"runtime"
 	"strings"
 	"testing"
@@ -33,7 +33,7 @@ that we are testing
 `
 		assert.Equal(t, actual, expectedOne)
 
-		raw, err := ioutil.ReadFile(fileName(t))
+		raw, err := os.ReadFile(fileName(t))
 		assert.NilError(t, err)
 
 		expected := "var expectedOne = `this is the\nactual value\nthat we are testing\n`"
@@ -51,7 +51,7 @@ expected value
 `
 		assert.Equal(t, actual, expectedTwo)
 
-		raw, err := ioutil.ReadFile(fileName(t))
+		raw, err := os.ReadFile(fileName(t))
 		assert.NilError(t, err)
 
 		expected := "const expectedTwo = `this is the new\nexpected value\n`"
@@ -72,7 +72,7 @@ for var inside function
 
 		assert.Equal(t, actual, expectedInsideFunc)
 
-		raw, err := ioutil.ReadFile(fileName(t))
+		raw, err := os.ReadFile(fileName(t))
 		assert.NilError(t, err)
 
 		expected := "expectedInsideFunc := `this is the new\nexpected value\nfor var inside function\n`"
@@ -93,7 +93,7 @@ for const inside function
 
 		assert.Equal(t, actual, expectedConstInsideFunc)
 
-		raw, err := ioutil.ReadFile(fileName(t))
+		raw, err := os.ReadFile(fileName(t))
 		assert.NilError(t, err)
 
 		expected := "const expectedConstInsideFunc = `this is the new\nexpected value\nfor const inside function\n`"

assert/cmd/gty-migrate-from-testify/call.go

@@ -22,8 +22,7 @@ type call struct {
 
 func (c call) String() string {
 	buf := new(bytes.Buffer)
-	//nolint: errcheck
-	format.Node(buf, token.NewFileSet(), c.expr)
+	_ = format.Node(buf, token.NewFileSet(), c.expr)
 	return buf.String()
 }
 

assert/cmd/gty-migrate-from-testify/main.go

@@ -8,7 +8,6 @@ import (
 	"go/ast"
 	"go/format"
 	"go/token"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -126,7 +125,7 @@ func run(opts options) error {
 				return fmt.Errorf("failed to format %s: %w", filename, err)
 			}
 
-			if err := ioutil.WriteFile(absFilename, raw, 0); err != nil {
+			if err := os.WriteFile(absFilename, raw, 0); err != nil {
 				return fmt.Errorf("failed to write file %s: %w", filename, err)
 			}
 		}

assert/cmd/gty-migrate-from-testify/main_test.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
@@ -25,7 +25,7 @@ func TestRun(t *testing.T) {
 	})
 	assert.NilError(t, err)
 
-	raw, err := ioutil.ReadFile(dir.Join("src/example.com/example/some_test.go"))
+	raw, err := os.ReadFile(dir.Join("src/example.com/example/some_test.go"))
 	assert.NilError(t, err)
 	golden.Assert(t, string(raw), "full-expected/some_test.go")
 }

assert/cmp/compare.go

@@ -249,7 +249,7 @@ type causer interface {
 }
 
 func formatErrorMessage(err error) string {
-	//nolint: errorlint // unwrapping is not appropriate here
+	//nolint:errorlint // unwrapping is not appropriate here
 	if _, ok := err.(causer); ok {
 		return fmt.Sprintf("%q\n%+v", err, err)
 	}

fs/example_test.go

@@ -1,7 +1,6 @@
 package fs_test
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -18,7 +17,7 @@ func ExampleNewDir() {
 	dir := fs.NewDir(t, "test-name", fs.WithFile("file1", "content\n"))
 	defer dir.Remove()
 
-	files, err := ioutil.ReadDir(dir.Path())
+	files, err := os.ReadDir(dir.Path())
 	assert.NilError(t, err)
 	assert.Assert(t, cmp.Len(files, 0))
 }
@@ -28,7 +27,7 @@ func ExampleNewFile() {
 	file := fs.NewFile(t, "test-name", fs.WithContent("content\n"), fs.AsUser(0, 0))
 	defer file.Remove()
 
-	content, err := ioutil.ReadFile(file.Path())
+	content, err := os.ReadFile(file.Path())
 	assert.NilError(t, err)
 	assert.Equal(t, "content\n", content)
 }

fs/file.go

@@ -5,7 +5,6 @@ contents and structure of a directory.
 package fs // import "gotest.tools/v3/fs"
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -46,7 +45,7 @@ func NewFile(t assert.TestingT, prefix string, ops ...PathOp) *File {
 	if ht, ok := t.(helperT); ok {
 		ht.Helper()
 	}
-	tempfile, err := ioutil.TempFile("", cleanPrefix(prefix)+"-")
+	tempfile, err := os.CreateTemp("", cleanPrefix(prefix)+"-")
 	assert.NilError(t, err)
 
 	file := &File{path: tempfile.Name()}
@@ -72,8 +71,7 @@ func (f *File) Path() string {
 
 // Remove the file
 func (f *File) Remove() {
-	//nolint: errcheck
-	os.Remove(f.path)
+	_ = os.Remove(f.path)
 }
 
 // Dir is a temporary directory
@@ -90,7 +88,7 @@ func NewDir(t assert.TestingT, prefix string, ops ...PathOp) *Dir {
 	if ht, ok := t.(helperT); ok {
 		ht.Helper()
 	}
-	path, err := ioutil.TempDir("", cleanPrefix(prefix)+"-")
+	path, err := os.MkdirTemp("", cleanPrefix(prefix)+"-")
 	assert.NilError(t, err)
 	dir := &Dir{path: path}
 	cleanup.Cleanup(t, dir.Remove)
@@ -106,8 +104,7 @@ func (d *Dir) Path() string {
 
 // Remove the directory
 func (d *Dir) Remove() {
-	//nolint: errcheck
-	os.RemoveAll(d.path)
+	_ = os.RemoveAll(d.path)
 }
 
 // Join returns a new path with this directory as the base of the path

fs/file_test.go

@@ -2,7 +2,6 @@ package fs_test
 
 import (
 	"errors"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -97,15 +96,11 @@ func TestNewDir_IntegrationWithCleanup(t *testing.T) {
 }
 
 func TestDirFromPath(t *testing.T) {
-	tmpdir, err := ioutil.TempDir("", t.Name())
-	assert.NilError(t, err)
-	t.Cleanup(func() {
-		os.RemoveAll(tmpdir)
-	})
+	tmpdir := t.TempDir()
 
 	dir := fs.DirFromPath(t, tmpdir, fs.WithFile("newfile", ""))
 
-	_, err = os.Stat(dir.Join("newfile"))
+	_, err := os.Stat(dir.Join("newfile"))
 	assert.NilError(t, err)
 
 	assert.Equal(t, dir.Path(), tmpdir)

fs/manifest.go

@@ -3,7 +3,6 @@ package fs
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -84,7 +83,7 @@ func manifestFromDir(path string) (Manifest, error) {
 
 func newDirectory(path string, info os.FileInfo) (*directory, error) {
 	items := make(map[string]dirEntry)
-	children, err := ioutil.ReadDir(path)
+	children, err := os.ReadDir(path)
 	if err != nil {
 		return nil, err
 	}
@@ -103,7 +102,11 @@ func newDirectory(path string, info os.FileInfo) (*directory, error) {
 	}, nil
 }
 
-func getTypedResource(path string, info os.FileInfo) (dirEntry, error) {
+func getTypedResource(path string, entry os.DirEntry) (dirEntry, error) {
+	info, err := entry.Info()
+	if err != nil {
+		return nil, err
+	}
 	switch {
 	case info.IsDir():
 		return newDirectory(path, info)

fs/manifest_test.go

@@ -3,7 +3,6 @@ package fs
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 	"os"
 	"runtime"
 	"strings"
@@ -92,12 +91,12 @@ var cmpManifest = cmp.Options{
 		if x == nil || y == nil {
 			return x == y
 		}
-		xContent, err := ioutil.ReadAll(x)
+		xContent, err := io.ReadAll(x)
 		if err != nil {
 			return false
 		}
 
-		yContent, err := ioutil.ReadAll(y)
+		yContent, err := io.ReadAll(y)
 		if err != nil {
 			return false
 		}
@@ -106,5 +105,5 @@ var cmpManifest = cmp.Options{
 }
 
 func readCloser(s string) io.ReadCloser {
-	return ioutil.NopCloser(strings.NewReader(s))
+	return io.NopCloser(strings.NewReader(s))
 }