misc/cgo: disable testcarchive, testplugin during -short test (including all.bash)

These tests take 20 seconds each to rebuild the entire world
in their respective modes. That's too much for short mode,
including all.bash on developer machines.

Keep doing it on builders and if someone runs 'go test' by hand
in that directory.

For #26473.

Change-Id: I3dc6955bc3aa7a20fd170efcde72a7d19b37bdbf
Reviewed-on: https://go-review.googlesource.com/c/go/+/177417
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

misc/cgo/testcarchive/carchive_test.go

@@ -8,6 +8,7 @@ import (
 	"bufio"
 	"bytes"
 	"debug/elf"
+	"flag"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -36,6 +37,11 @@ var GOOS, GOARCH, GOPATH string
 var libgodir string
 
 func TestMain(m *testing.M) {
+	flag.Parse()
+	if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
+		fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
+		os.Exit(0)
+	}
 	log.SetFlags(log.Lshortfile)
 	os.Exit(testMain(m))
 }

misc/cgo/testcshared/cshared_test.go

@@ -7,6 +7,7 @@ package cshared_test
 import (
 	"bytes"
 	"debug/elf"
+	"flag"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -36,6 +37,11 @@ func TestMain(m *testing.M) {
 
 func testMain(m *testing.M) int {
 	log.SetFlags(log.Lshortfile)
+	flag.Parse()
+	if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
+		fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
+		os.Exit(0)
+	}
 
 	GOOS = goEnv("GOOS")
 	GOARCH = goEnv("GOARCH")

misc/cgo/testplugin/plugin_test.go

@@ -7,6 +7,7 @@ package plugin_test
 import (
 	"bytes"
 	"context"
+	"flag"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -22,6 +23,11 @@ import (
 var gcflags string = os.Getenv("GO_GCFLAGS")
 
 func TestMain(m *testing.M) {
+	flag.Parse()
+	if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
+		fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
+		os.Exit(0)
+	}
 	log.SetFlags(log.Lshortfile)
 	os.Exit(testMain(m))
 }

src/cmd/dist/test.go

@@ -991,7 +991,7 @@ func (t *tester) runHostTest(dir, pkg string) error {
 	if err := cmd.Run(); err != nil {
 		return err
 	}
-	return t.dirCmd(dir, "./test.test").Run()
+	return t.dirCmd(dir, "./test.test", "-test.short").Run()
 }
 
 func (t *tester) cgoTest(dt *distTest) error {