tpl: Sync go_templates for Go 1.18

Using Go tag go1.18 4aa1efed4853ea067d665a952eee77c52faac774

Updates #9677

tpl/internal/go_templates/testenv/testenv.go

@@ -11,6 +11,7 @@
 package testenv
 
 import (
+	"bytes"
 	"errors"
 	"flag"
 	"github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"
@@ -22,6 +23,7 @@ import (
 	"strings"
 	"sync"
 	"testing"
+	"time"
 )
 
 // Builder reports the name of the builder running this test
@@ -306,3 +308,59 @@ func SkipIfShortAndSlow(t testing.TB) {
 		t.Skipf("skipping test in -short mode on %s", runtime.GOARCH)
 	}
 }
+
+// RunWithTimeout runs cmd and returns its combined output. If the
+// subprocess exits with a non-zero status, it will log that status
+// and return a non-nil error, but this is not considered fatal.
+func RunWithTimeout(t testing.TB, cmd *exec.Cmd) ([]byte, error) {
+	args := cmd.Args
+	if args == nil {
+		args = []string{cmd.Path}
+	}
+
+	var b bytes.Buffer
+	cmd.Stdout = &b
+	cmd.Stderr = &b
+	if err := cmd.Start(); err != nil {
+		t.Fatalf("starting %s: %v", args, err)
+	}
+
+	// If the process doesn't complete within 1 minute,
+	// assume it is hanging and kill it to get a stack trace.
+	p := cmd.Process
+	done := make(chan bool)
+	go func() {
+		scale := 1
+		// This GOARCH/GOOS test is copied from cmd/dist/test.go.
+		// TODO(iant): Have cmd/dist update the environment variable.
+		if runtime.GOARCH == "arm" || runtime.GOOS == "windows" {
+			scale = 2
+		}
+		if s := os.Getenv("GO_TEST_TIMEOUT_SCALE"); s != "" {
+			if sc, err := strconv.Atoi(s); err == nil {
+				scale = sc
+			}
+		}
+
+		select {
+		case <-done:
+		case <-time.After(time.Duration(scale) * time.Minute):
+			p.Signal(Sigquit)
+			// If SIGQUIT doesn't do it after a little
+			// while, kill the process.
+			select {
+			case <-done:
+			case <-time.After(time.Duration(scale) * 30 * time.Second):
+				p.Signal(os.Kill)
+			}
+		}
+	}()
+
+	err := cmd.Wait()
+	if err != nil {
+		t.Logf("%s exit status: %v", args, err)
+	}
+	close(done)
+
+	return b.Bytes(), err
+}

tpl/internal/go_templates/testenv/testenv_cgo.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cgo
+//go:build cgo
 
 package testenv
 

tpl/internal/go_templates/testenv/testenv_notunix.go

@@ -0,0 +1,13 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build windows || plan9 || (js && wasm)
+
+package testenv
+
+import "os"
+
+// Sigquit is the signal to send to kill a hanging subprocess.
+// On Unix we send SIGQUIT, but on non-Unix we only have os.Kill.
+var Sigquit = os.Kill

tpl/internal/go_templates/testenv/testenv_notwin.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !windows
+//go:build !windows
 
 package testenv
 

tpl/internal/go_templates/testenv/testenv_unix.go

@@ -0,0 +1,13 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
+
+package testenv
+
+import "syscall"
+
+// Sigquit is the signal to send to kill a hanging subprocess.
+// Send SIGQUIT to get a stack trace.
+var Sigquit = syscall.SIGQUIT