refactor: move from io/ioutil to io and os package (#17109)

The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

4 files changed, 11 insertions, 13 deletions

diff --git a/build/generate-bindata.go b/build/generate-bindata.go
index efd172f779..477139d67b 100644
--- a/build/generate-bindata.go
+++ b/build/generate-bindata.go
@@ -11,7 +11,6 @@ import (
 	"bytes"
 	"crypto/sha1"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -28,7 +27,7 @@ func needsUpdate(dir string, filename string) (bool, []byte) {
 		needRegen = true
 	}
 
-	oldHash, err := ioutil.ReadFile(filename + ".hash")
+	oldHash, err := os.ReadFile(filename + ".hash")
 	if err != nil {
 		oldHash = []byte{}
 	}
@@ -83,5 +82,5 @@ func main() {
 	if err != nil {
 		log.Fatalf("%v\n", err)
 	}
-	_ = ioutil.WriteFile(filename+".hash", newHash, 0666)
+	_ = os.WriteFile(filename+".hash", newHash, 0666)
 }
diff --git a/build/generate-emoji.go b/build/generate-emoji.go
index da4e12373c..aa56d45f74 100644
--- a/build/generate-emoji.go
+++ b/build/generate-emoji.go
@@ -12,9 +12,10 @@ import (
 	"flag"
 	"fmt"
 	"go/format"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
+	"os"
 	"regexp"
 	"sort"
 	"strconv"
@@ -67,7 +68,7 @@ func main() {
 	}
 
 	// write
-	err = ioutil.WriteFile(*flagOut, buf, 0644)
+	err = os.WriteFile(*flagOut, buf, 0644)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -96,7 +97,7 @@ func generate() ([]byte, error) {
 	defer res.Body.Close()
 
 	// read all
-	body, err := ioutil.ReadAll(res.Body)
+	body, err := io.ReadAll(res.Body)
 	if err != nil {
 		return nil, err
 	}
@@ -157,7 +158,7 @@ func generate() ([]byte, error) {
 
 	// write a JSON file to use with tribute (write before adding skin tones since we can't support them there yet)
 	file, _ := json.Marshal(data)
-	_ = ioutil.WriteFile("assets/emoji.json", file, 0644)
+	_ = os.WriteFile("assets/emoji.json", file, 0644)
 
 	// Add skin tones to emoji that support it
 	var (
diff --git a/build/generate-gitignores.go b/build/generate-gitignores.go
index d0b972e803..811953ee4a 100644
--- a/build/generate-gitignores.go
+++ b/build/generate-gitignores.go
@@ -9,7 +9,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -34,7 +33,7 @@ func main() {
 	flag.StringVar(&githubApiToken, "token", "", "github api token")
 	flag.Parse()
 
-	file, err := ioutil.TempFile(os.TempDir(), prefix)
+	file, err := os.CreateTemp(os.TempDir(), prefix)
 
 	if err != nil {
 		log.Fatalf("Failed to create temp file. %s", err)
@@ -114,13 +113,13 @@ func main() {
 	for dst, src := range filesToCopy {
 		// Read all content of src to data
 		src = path.Join(destination, src)
-		data, err := ioutil.ReadFile(src)
+		data, err := os.ReadFile(src)
 		if err != nil {
 			log.Fatalf("Failed to read src file. %s", err)
 		}
 		// Write data to dst
 		dst = path.Join(destination, dst)
-		err = ioutil.WriteFile(dst, data, 0644)
+		err = os.WriteFile(dst, data, 0644)
 		if err != nil {
 			log.Fatalf("Failed to write new file. %s", err)
 		}
diff --git a/build/generate-licenses.go b/build/generate-licenses.go
index 4009a0351d..75fb7cc810 100644
--- a/build/generate-licenses.go
+++ b/build/generate-licenses.go
@@ -9,7 +9,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
@@ -34,7 +33,7 @@ func main() {
 	flag.StringVar(&githubApiToken, "token", "", "github api token")
 	flag.Parse()
 
-	file, err := ioutil.TempFile(os.TempDir(), prefix)
+	file, err := os.CreateTemp(os.TempDir(), prefix)
 
 	if err != nil {
 		log.Fatalf("Failed to create temp file. %s", err)