cmd/go: improve handling of tmpdir being noexec

Author: ZekeLu

src/cmd/go/internal/work/action.go

@@ -13,6 +13,7 @@ import (
 	"context"
 	"debug/elf"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -254,7 +255,13 @@ func (b *Builder) Init() {
 	} else {
 		tmp, err := os.MkdirTemp(cfg.Getenv("GOTMPDIR"), "go-build")
 		if err != nil {
-			base.Fatalf("go: creating work dir: %v", err)
+			if errors.Is(err, os.ErrPermission) {
+				base.Fatalf("go: creating work dir: %v.\n"+
+					"\tRun 'go env -w GOTMPDIR=...' to specify another temporary directory.\n"+
+					"\tFor more about GOTMPDIR, see 'go help environment'.", err)
+			} else {
+				base.Fatalf("go: creating work dir: %v", err)
+			}
 		}
 		if !filepath.IsAbs(tmp) {
 			abs, err := filepath.Abs(tmp)