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747 |
jeremybenn |
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package exec
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"net/http/httptest"
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"os"
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"runtime"
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"strconv"
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"strings"
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"syscall"
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"testing"
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)
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func helperCommand(s ...string) *Cmd {
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cs := []string{"-test.run=TestHelperProcess", "--"}
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cs = append(cs, s...)
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cmd := Command(os.Args[0], cs...)
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cmd.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
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return cmd
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}
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func TestEcho(t *testing.T) {
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bs, err := helperCommand("echo", "foo bar", "baz").Output()
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if err != nil {
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t.Errorf("echo: %v", err)
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}
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if g, e := string(bs), "foo bar baz\n"; g != e {
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t.Errorf("echo: want %q, got %q", e, g)
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}
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}
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func TestCatStdin(t *testing.T) {
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// Cat, testing stdin and stdout.
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input := "Input string\nLine 2"
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p := helperCommand("cat")
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p.Stdin = strings.NewReader(input)
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bs, err := p.Output()
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if err != nil {
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t.Errorf("cat: %v", err)
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}
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s := string(bs)
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if s != input {
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t.Errorf("cat: want %q, got %q", input, s)
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}
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}
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func TestCatGoodAndBadFile(t *testing.T) {
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// Testing combined output and error values.
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bs, err := helperCommand("cat", "/bogus/file.foo", "exec_test.go").CombinedOutput()
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if _, ok := err.(*ExitError); !ok {
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t.Errorf("expected *ExitError from cat combined; got %T: %v", err, err)
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}
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s := string(bs)
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sp := strings.SplitN(s, "\n", 2)
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if len(sp) != 2 {
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t.Fatalf("expected two lines from cat; got %q", s)
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}
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errLine, body := sp[0], sp[1]
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if !strings.HasPrefix(errLine, "Error: open /bogus/file.foo") {
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t.Errorf("expected stderr to complain about file; got %q", errLine)
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}
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if !strings.Contains(body, "func TestHelperProcess(t *testing.T)") {
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t.Errorf("expected test code; got %q (len %d)", body, len(body))
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}
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}
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func TestNoExistBinary(t *testing.T) {
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// Can't run a non-existent binary
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err := Command("/no-exist-binary").Run()
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if err == nil {
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t.Error("expected error from /no-exist-binary")
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}
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}
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func TestExitStatus(t *testing.T) {
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// Test that exit values are returned correctly
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err := helperCommand("exit", "42").Run()
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if werr, ok := err.(*ExitError); ok {
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if s, e := werr.Error(), "exit status 42"; s != e {
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t.Errorf("from exit 42 got exit %q, want %q", s, e)
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}
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} else {
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t.Fatalf("expected *ExitError from exit 42; got %T: %v", err, err)
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}
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}
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func TestPipes(t *testing.T) {
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check := func(what string, err error) {
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if err != nil {
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t.Fatalf("%s: %v", what, err)
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}
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}
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// Cat, testing stdin and stdout.
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c := helperCommand("pipetest")
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stdin, err := c.StdinPipe()
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check("StdinPipe", err)
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stdout, err := c.StdoutPipe()
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check("StdoutPipe", err)
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stderr, err := c.StderrPipe()
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check("StderrPipe", err)
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outbr := bufio.NewReader(stdout)
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errbr := bufio.NewReader(stderr)
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line := func(what string, br *bufio.Reader) string {
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line, _, err := br.ReadLine()
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if err != nil {
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t.Fatalf("%s: %v", what, err)
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}
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return string(line)
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}
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err = c.Start()
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check("Start", err)
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_, err = stdin.Write([]byte("O:I am output\n"))
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check("first stdin Write", err)
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if g, e := line("first output line", outbr), "O:I am output"; g != e {
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t.Errorf("got %q, want %q", g, e)
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}
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_, err = stdin.Write([]byte("E:I am error\n"))
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check("second stdin Write", err)
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if g, e := line("first error line", errbr), "E:I am error"; g != e {
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t.Errorf("got %q, want %q", g, e)
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}
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_, err = stdin.Write([]byte("O:I am output2\n"))
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check("third stdin Write 3", err)
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if g, e := line("second output line", outbr), "O:I am output2"; g != e {
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t.Errorf("got %q, want %q", g, e)
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}
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stdin.Close()
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err = c.Wait()
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check("Wait", err)
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}
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func TestExtraFiles(t *testing.T) {
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if runtime.GOOS == "windows" {
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t.Logf("no operating system support; skipping")
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return
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}
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// Ensure that file descriptors have not already been leaked into
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// our environment.
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for fd := os.Stderr.Fd() + 1; fd <= 101; fd++ {
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err := syscall.Close(fd)
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if err == nil {
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t.Logf("Something already leaked - closed fd %d", fd)
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}
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}
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// Force network usage, to verify the epoll (or whatever) fd
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// doesn't leak to the child,
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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defer ln.Close()
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// Force TLS root certs to be loaded (which might involve
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// cgo), to make sure none of that potential C code leaks fds.
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ts := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("Hello"))
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}))
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defer ts.Close()
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http.Get(ts.URL) // ignore result; just calling to force root cert loading
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tf, err := ioutil.TempFile("", "")
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if err != nil {
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t.Fatalf("TempFile: %v", err)
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}
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defer os.Remove(tf.Name())
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defer tf.Close()
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const text = "Hello, fd 3!"
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_, err = tf.Write([]byte(text))
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if err != nil {
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t.Fatalf("Write: %v", err)
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}
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_, err = tf.Seek(0, os.SEEK_SET)
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if err != nil {
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t.Fatalf("Seek: %v", err)
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}
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c := helperCommand("read3")
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c.ExtraFiles = []*os.File{tf}
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bs, err := c.CombinedOutput()
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if err != nil {
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t.Fatalf("CombinedOutput: %v; output %q", err, bs)
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}
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if string(bs) != text {
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t.Errorf("got %q; want %q", string(bs), text)
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}
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}
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// TestHelperProcess isn't a real test. It's used as a helper process
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// for TestParameterRun.
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func TestHelperProcess(*testing.T) {
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if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
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return
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}
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defer os.Exit(0)
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// Determine which command to use to display open files.
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ofcmd := "lsof"
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switch runtime.GOOS {
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case "freebsd", "netbsd", "openbsd":
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ofcmd = "fstat"
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}
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args := os.Args
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for len(args) > 0 {
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if args[0] == "--" {
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args = args[1:]
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break
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}
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args = args[1:]
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}
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if len(args) == 0 {
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fmt.Fprintf(os.Stderr, "No command\n")
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os.Exit(2)
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}
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cmd, args := args[0], args[1:]
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switch cmd {
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case "echo":
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iargs := []interface{}{}
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for _, s := range args {
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iargs = append(iargs, s)
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}
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fmt.Println(iargs...)
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case "cat":
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if len(args) == 0 {
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io.Copy(os.Stdout, os.Stdin)
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return
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}
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exit := 0
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for _, fn := range args {
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f, err := os.Open(fn)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error: %v\n", err)
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exit = 2
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} else {
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defer f.Close()
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io.Copy(os.Stdout, f)
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}
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}
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os.Exit(exit)
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case "pipetest":
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bufr := bufio.NewReader(os.Stdin)
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for {
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line, _, err := bufr.ReadLine()
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if err == io.EOF {
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break
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} else if err != nil {
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os.Exit(1)
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}
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if bytes.HasPrefix(line, []byte("O:")) {
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os.Stdout.Write(line)
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os.Stdout.Write([]byte{'\n'})
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} else if bytes.HasPrefix(line, []byte("E:")) {
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os.Stderr.Write(line)
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os.Stderr.Write([]byte{'\n'})
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} else {
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os.Exit(1)
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}
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}
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case "read3": // read fd 3
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fd3 := os.NewFile(3, "fd3")
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bs, err := ioutil.ReadAll(fd3)
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if err != nil {
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fmt.Printf("ReadAll from fd 3: %v", err)
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os.Exit(1)
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}
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switch runtime.GOOS {
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case "darwin":
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// TODO(bradfitz): broken? Sometimes.
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// http://golang.org/issue/2603
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// Skip this additional part of the test for now.
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default:
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// Now verify that there are no other open fds.
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var files []*os.File
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for wantfd := os.Stderr.Fd() + 2; wantfd <= 100; wantfd++ {
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f, err := os.Open(os.Args[0])
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if err != nil {
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fmt.Printf("error opening file with expected fd %d: %v", wantfd, err)
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os.Exit(1)
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}
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if got := f.Fd(); got != wantfd {
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fmt.Printf("leaked parent file. fd = %d; want %d\n", got, wantfd)
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out, _ := Command(ofcmd, "-p", fmt.Sprint(os.Getpid())).CombinedOutput()
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fmt.Print(string(out))
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os.Exit(1)
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}
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files = append(files, f)
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}
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for _, f := range files {
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f.Close()
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}
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| 311 |
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}
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// Referring to fd3 here ensures that it is not
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// garbage collected, and therefore closed, while
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// executing the wantfd loop above. It doesn't matter
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// what we do with fd3 as long as we refer to it;
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// closing it is the easy choice.
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fd3.Close()
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os.Stderr.Write(bs)
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case "exit":
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n, _ := strconv.Atoi(args[0])
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os.Exit(n)
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default:
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fmt.Fprintf(os.Stderr, "Unknown command %q\n", cmd)
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os.Exit(2)
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}
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}
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