misc/cgo/testcshared: use adb exec-out instead of adb shell

Adb exec-out is like adb shell except non-flaky in non-interactive
settings. Don't ask why.

Change-Id: I7ac3c72912883d80bc787c1d0fc101db6bae9c52
Reviewed-on: https://go-review.googlesource.com/c/go/+/170952
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

misc/cgo/testcshared/cshared_test.go

@@ -46,7 +46,7 @@ func testMain(m *testing.M) int {
 
 	androiddir = fmt.Sprintf("/data/local/tmp/testcshared-%d", os.Getpid())
 	if GOOS == "android" {
-		args := append(adbCmd(), "shell", "mkdir", "-p", androiddir)
+		args := append(adbCmd(), "exec-out", "mkdir", "-p", androiddir)
 		cmd := exec.Command(args[0], args[1:]...)
 		out, err := cmd.CombinedOutput()
 		if err != nil {
@@ -191,7 +191,7 @@ func adbRun(t *testing.T, env []string, adbargs ...string) string {
 	if GOOS != "android" {
 		t.Fatalf("trying to run adb command when operating system is not android.")
 	}
-	args := append(adbCmd(), "shell")
+	args := append(adbCmd(), "exec-out")
 	// Propagate LD_LIBRARY_PATH to the adb shell invocation.
 	for _, e := range env {
 		if strings.Index(e, "LD_LIBRARY_PATH=") != -1 {
@@ -298,7 +298,7 @@ func cleanupAndroid() {
 	if GOOS != "android" {
 		return
 	}
-	args := append(adbCmd(), "shell", "rm", "-rf", androiddir)
+	args := append(adbCmd(), "exec-out", "rm", "-rf", androiddir)
 	cmd := exec.Command(args[0], args[1:]...)
 	out, err := cmd.CombinedOutput()
 	if err != nil {