chore: remove refs to deprecated io/ioutil (#716)

c-bindings/c-bindings.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"unsafe"
@@ -238,7 +237,7 @@ func jsonnet_evaluate_snippet_multi(vmRef *C.struct_JsonnetVm, filename *C.char,
 //export jsonnet_evaluate_file
 func jsonnet_evaluate_file(vmRef *C.struct_JsonnetVm, filename *C.char, e *C.int) *C.char {
 	f := C.GoString(filename)
-	data, err := ioutil.ReadFile(f)
+	data, err := os.ReadFile(f)
 	if err != nil {
 		*e = 1
 		return C.CString(fmt.Sprintf("Failed to read input file: %s: %s", f, err.Error()))
@@ -249,7 +248,7 @@ func jsonnet_evaluate_file(vmRef *C.struct_JsonnetVm, filename *C.char, e *C.int
 //export jsonnet_evaluate_file_stream
 func jsonnet_evaluate_file_stream(vmRef *C.struct_JsonnetVm, filename *C.char, e *C.int) *C.char {
 	f := C.GoString(filename)
-	data, err := ioutil.ReadFile(f)
+	data, err := os.ReadFile(f)
 	if err != nil {
 		*e = 1
 		return C.CString(fmt.Sprintf("Failed to read input file: %s: %s", f, err.Error()))
@@ -260,7 +259,7 @@ func jsonnet_evaluate_file_stream(vmRef *C.struct_JsonnetVm, filename *C.char, e
 //export jsonnet_evaluate_file_multi
 func jsonnet_evaluate_file_multi(vmRef *C.struct_JsonnetVm, filename *C.char, e *C.int) *C.char {
 	f := C.GoString(filename)
-	data, err := ioutil.ReadFile(f)
+	data, err := os.ReadFile(f)
 	if err != nil {
 		*e = 1
 		return C.CString(fmt.Sprintf("Failed to read input file: %s: %s", f, err.Error()))
@@ -622,7 +621,7 @@ func jsonnet_fmt_snippet(vmRef *C.struct_JsonnetVm, filename *C.char, code *C.ch
 //export jsonnet_fmt_file
 func jsonnet_fmt_file(vmRef *C.struct_JsonnetVm, filename *C.char, e *C.int) *C.char {
 	f := C.GoString(filename)
-	data, err := ioutil.ReadFile(f)
+	data, err := os.ReadFile(f)
 	if err != nil {
 		*e = 1
 		return C.CString(fmt.Sprintf("Failed to read input file: %s: %s", f, err.Error()))

cmd/dumpstdlibast/dumpstdlibast.go

@@ -15,7 +15,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -29,7 +28,7 @@ func main() {
 		fmt.Fprintf(os.Stderr, "usage: %s <file>\n", filepath.Base(os.Args[0]))
 		os.Exit(2)
 	}
-	buf, err := ioutil.ReadFile(os.Args[1])
+	buf, err := os.ReadFile(os.Args[1])
 	if err != nil {
 		panic(err)
 	}

cmd/internal/cmd/utils.go

@@ -20,7 +20,7 @@ package cmd
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"path/filepath"
@@ -81,12 +81,12 @@ func ReadInput(filenameIsCode bool, filename *string) (input string, err error)
 		*filename = "<cmdline>"
 	} else if *filename == "-" {
 		var bytes []byte
-		bytes, err = ioutil.ReadAll(os.Stdin)
+		bytes, err = io.ReadAll(os.Stdin)
 		input = string(bytes)
 		*filename = "<stdin>"
 	} else {
 		var bytes []byte
-		bytes, err = ioutil.ReadFile(*filename)
+		bytes, err = os.ReadFile(*filename)
 		input = string(bytes)
 	}
 	return

cmd/jsonnet-lint/cmd.go

@@ -3,7 +3,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -166,7 +165,7 @@ func main() {
 		if err != nil {
 			die(err)
 		}
-		data, err := ioutil.ReadAll(f)
+		data, err := io.ReadAll(f)
 		if err != nil {
 			die(err)
 		}

cmd/jsonnet/cmd.go

@@ -19,7 +19,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -327,7 +326,7 @@ func writeMultiOutputFiles(output map[string]string, outputDir, outputFile strin
 		}
 
 		if _, err := os.Stat(filename); !os.IsNotExist(err) {
-			existingContent, err := ioutil.ReadFile(filename)
+			existingContent, err := os.ReadFile(filename)
 			if err != nil {
 				return err
 			}
@@ -344,7 +343,7 @@ func writeMultiOutputFiles(output map[string]string, outputDir, outputFile strin
 			}
 		}
 
-		err = ioutil.WriteFile(filename, []byte(newContent), 0666)
+		err = os.WriteFile(filename, []byte(newContent), 0666)
 		if err != nil {
 			return err
 		}

imports.go

@@ -18,7 +18,6 @@ package jsonnet
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"unsafe"
@@ -241,7 +240,7 @@ func (importer *FileImporter) tryPath(dir, importedPath string) (found bool, con
 	if cacheEntry, isCached := importer.fsCache[absPath]; isCached {
 		entry = cacheEntry
 	} else {
-		contentBytes, err := ioutil.ReadFile(absPath)
+		contentBytes, err := os.ReadFile(absPath)
 		if err != nil {
 			if os.IsNotExist(err) {
 				entry = &fsCacheEntry{

internal/testutils/test_utils.go

@@ -3,7 +3,6 @@ package testutils
 
 import (
 	"bytes"
-	"io/ioutil"
 	"os"
 
 	"github.com/sergi/go-diff/diffmatchpatch"
@@ -31,15 +30,15 @@ func CompareWithGolden(result string, golden []byte) (string, bool) {
 // are actually different from what is already there. It returns whether or not
 // the overwrite was performed (i.e. the desired content was different than actual).
 func UpdateGoldenFile(path string, content []byte, mode os.FileMode) (changed bool, err error) {
-	old, err := ioutil.ReadFile(path)
+	old, err := os.ReadFile(path)
 	if err != nil && !os.IsNotExist(err) {
 		return false, err
 	}
 	// If it exists and already has the right content, do nothing,
 	if bytes.Equal(old, content) && !os.IsNotExist(err) {
 		return false, nil
 	}
-	if err := ioutil.WriteFile(path, content, mode); err != nil {
+	if err := os.WriteFile(path, content, mode); err != nil {
 		return false, err
 	}
 	return true, nil

linter/linter_test.go

@@ -3,7 +3,7 @@ package linter
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -27,7 +27,7 @@ type ChangedGoldensList struct {
 
 func runTest(t *testing.T, test *linterTest, changedGoldensList *ChangedGoldensList) {
 	read := func(file string) []byte {
-		bytz, err := ioutil.ReadFile(file)
+		bytz, err := os.ReadFile(file)
 		if err != nil {
 			t.Fatalf("reading file: %s: %v", file, err)
 		}
@@ -61,7 +61,7 @@ func runTest(t *testing.T, test *linterTest, changedGoldensList *ChangedGoldensL
 			changedGoldensList.changedGoldens = append(changedGoldensList.changedGoldens, test.output)
 		}
 	} else {
-		golden, err := ioutil.ReadFile(test.output)
+		golden, err := os.ReadFile(test.output)
 		if err != nil {
 			t.Error(err)
 			return
@@ -74,7 +74,7 @@ func runTest(t *testing.T, test *linterTest, changedGoldensList *ChangedGoldensL
 
 func runTests(t *testing.T, tests []*linterTest) {
 	read := func(file string) []byte {
-		bytz, err := ioutil.ReadFile(file)
+		bytz, err := os.ReadFile(file)
 		if err != nil {
 			t.Fatalf("reading file: %s: %v", file, err)
 		}

main_test.go

@@ -22,7 +22,6 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -229,7 +228,7 @@ func compareSingleGolden(path string, result jsonnetResult) []error {
 	if result.outputMulti != nil {
 		return []error{fmt.Errorf("outputMulti is populated in a single-file test for %v", path)}
 	}
-	golden, err := ioutil.ReadFile(path)
+	golden, err := os.ReadFile(path)
 	if err != nil {
 		return []error{fmt.Errorf("reading file %s: %v", path, err)}
 	}
@@ -254,14 +253,14 @@ func updateSingleGolden(path string, result jsonnetResult) (updated []string, er
 }
 
 func compareMultifileGolden(path string, result jsonnetResult) []error {
-	expectFiles, err := ioutil.ReadDir(path)
+	expectFiles, err := os.ReadDir(path)
 	if err != nil {
 		return []error{fmt.Errorf("reading golden dir %v: %v", path, err)}
 	}
 	goldenContent := map[string][]byte{}
 	var errs []error
 	for _, f := range expectFiles {
-		golden, err := ioutil.ReadFile(filepath.Join(path, f.Name()))
+		golden, err := os.ReadFile(filepath.Join(path, f.Name()))
 		if err != nil {
 			return []error{fmt.Errorf("reading file %s: %v", f.Name(), err)}
 		}
@@ -284,7 +283,7 @@ func compareMultifileGolden(path string, result jsonnetResult) []error {
 }
 
 func updateMultifileGolden(path string, result jsonnetResult) ([]string, error) {
-	expectFiles, err := ioutil.ReadDir(path)
+	expectFiles, err := os.ReadDir(path)
 	if err != nil {
 		return nil, fmt.Errorf("reading golden directory %v: %v", path, err)
 	}
@@ -312,7 +311,7 @@ func updateMultifileGolden(path string, result jsonnetResult) ([]string, error)
 
 func runTest(t *testing.T, test *mainTest) {
 	read := func(file string) []byte {
-		bytz, err := ioutil.ReadFile(file)
+		bytz, err := os.ReadFile(file)
 		if err != nil {
 			t.Fatalf("reading file: %s: %v", file, err)
 		}
@@ -413,7 +412,7 @@ func TestEvalUnusualFilenames(t *testing.T) {
 	dir := os.Getenv("TEST_TMPDIR")
 	if len(dir) == 0 {
 		var err error
-		if dir, err = ioutil.TempDir("", "jsonnet"); err != nil {
+		if dir, err = os.MkdirTemp("", "jsonnet"); err != nil {
 			t.Fatal(err)
 		}
 		defer func() {
@@ -425,11 +424,11 @@ func TestEvalUnusualFilenames(t *testing.T) {
 	}
 
 	copySmallFile := func(t *testing.T, dst, src string) {
-		b, err := ioutil.ReadFile(src)
+		b, err := os.ReadFile(src)
 		if err != nil {
 			t.Fatal(err)
 		}
-		if err := ioutil.WriteFile(dst, b, 0444); err != nil {
+		if err := os.WriteFile(dst, b, 0444); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -502,10 +501,10 @@ func TestEvalUnusualFilenames(t *testing.T) {
 `),
 		},
 	} {
-		if err := ioutil.WriteFile(f.name+".jsonnet", f.content, 0444); err != nil {
+		if err := os.WriteFile(f.name+".jsonnet", f.content, 0444); err != nil {
 			t.Fatal(err)
 		}
-		if err := ioutil.WriteFile(f.name+".golden", f.golden, 0444); err != nil {
+		if err := os.WriteFile(f.name+".golden", f.golden, 0444); err != nil {
 			t.Fatal(err)
 		}
 		t.Run(f.name, func(t *testing.T) {