replace io/ioutil with os

Makefile

@@ -26,4 +26,4 @@ coverage.html: coverage.out
 
 .PHONY: clean
 clean:
-	rm -f undocker-*-v* coverage.html
+	rm -f undocker coverage.html

main_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"errors"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -28,7 +27,7 @@ func TestExecute(t *testing.T) {
 			infile: "t10-in.txt",
 			fixture: func(t *testing.T, dir string) {
 				fname := filepath.Join(dir, "t10-in.txt")
-				if err := ioutil.WriteFile(fname, _foo, 0644); err != nil {
+				if err := os.WriteFile(fname, _foo, 0644); err != nil {
 					t.Fatalf("unexpected error: %v", err)
 				}
 			},
@@ -39,7 +38,7 @@ func TestExecute(t *testing.T) {
 			infile: "t20-in.txt",
 			fixture: func(t *testing.T, dir string) {
 				fname := filepath.Join(dir, "t20-in.txt")
-				if err := ioutil.WriteFile(fname, _foo, 0644); err != nil {
+				if err := os.WriteFile(fname, _foo, 0644); err != nil {
 					t.Fatalf("unexpected error: %v", err)
 				}
 			},
@@ -50,7 +49,7 @@ func TestExecute(t *testing.T) {
 			infile: "t30-in.txt",
 			fixture: func(t *testing.T, dir string) {
 				fname := filepath.Join(dir, "t30-in.txt")
-				if err := ioutil.WriteFile(fname, _foo, 0644); err != nil {
+				if err := os.WriteFile(fname, _foo, 0644); err != nil {
 					t.Fatalf("unexpected error: %v", err)
 				}
 			},
@@ -122,7 +121,7 @@ func TestExecute(t *testing.T) {
 			if tt.outfile == "-" {
 				out = stdout.Bytes()
 			} else {
-				out, err = ioutil.ReadFile(tt.outfile)
+				out, err = os.ReadFile(tt.outfile)
 				if err != nil {
 					t.Fatalf("unexpected error: %v", err)
 				}

release

@@ -6,8 +6,8 @@ _err(){ >&2 echo "ERROR: $*"; exit 1; }
 git status --porcelain | grep -q "" &&
     _err "working tree is dirty, commit your changes first."
 
-[[ "$1" =~ ^v([0-9]+)\.([0-9]+)(\.([0-9]+))?$ ]] || \
-    _err "arg1 accepts the following formats: v1.0 v1.0.0"
+[[ "$1" =~ ^v([0-9]+)\.([0-9]+)(\.([0-9]+))?(-rc([0-9]+))?$ ]] || \
+    _err "arg1 accepts the following formats: v1.0 v1.0.0 v1.0-rc1 v1.0.1-rc1"
 
 git tag | grep -q "^$1$" &&
     _err "tag $1 already exists"
@@ -21,5 +21,5 @@ last_tag=$(git tag | tail -1)
     echo undocker "$1"
     echo
     echo Changelog since "$last_tag":
-    git log --pretty=format:"- [%cn] %s" "$last_tag"..HEAD
+    git log --pretty=format:"- [%an] %s" "$last_tag"..HEAD
 } | git tag -u motiejus@jakstys.lt -F - "$1"