summaryrefslogtreecommitdiff
path: root/libgo/go/os/exec/exec_test.go
blob: ff8954fd020f2d23ed42e3f2d4de601dc0e64358 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
// Copyright 2009 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.

package exec

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"net"
	"net/http"
	"net/http/httptest"
	"os"
	"runtime"
	"strconv"
	"strings"
	"testing"
)

func helperCommand(s ...string) *Cmd {
	cs := []string{"-test.run=TestHelperProcess", "--"}
	cs = append(cs, s...)
	cmd := Command(os.Args[0], cs...)
	cmd.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
	return cmd
}

func TestEcho(t *testing.T) {
	bs, err := helperCommand("echo", "foo bar", "baz").Output()
	if err != nil {
		t.Errorf("echo: %v", err)
	}
	if g, e := string(bs), "foo bar baz\n"; g != e {
		t.Errorf("echo: want %q, got %q", e, g)
	}
}

func TestCatStdin(t *testing.T) {
	// Cat, testing stdin and stdout.
	input := "Input string\nLine 2"
	p := helperCommand("cat")
	p.Stdin = strings.NewReader(input)
	bs, err := p.Output()
	if err != nil {
		t.Errorf("cat: %v", err)
	}
	s := string(bs)
	if s != input {
		t.Errorf("cat: want %q, got %q", input, s)
	}
}

func TestCatGoodAndBadFile(t *testing.T) {
	// Testing combined output and error values.
	bs, err := helperCommand("cat", "/bogus/file.foo", "exec_test.go").CombinedOutput()
	if _, ok := err.(*ExitError); !ok {
		t.Errorf("expected *ExitError from cat combined; got %T: %v", err, err)
	}
	s := string(bs)
	sp := strings.SplitN(s, "\n", 2)
	if len(sp) != 2 {
		t.Fatalf("expected two lines from cat; got %q", s)
	}
	errLine, body := sp[0], sp[1]
	if !strings.HasPrefix(errLine, "Error: open /bogus/file.foo") {
		t.Errorf("expected stderr to complain about file; got %q", errLine)
	}
	if !strings.Contains(body, "func TestHelperProcess(t *testing.T)") {
		t.Errorf("expected test code; got %q (len %d)", body, len(body))
	}
}

func TestNoExistBinary(t *testing.T) {
	// Can't run a non-existent binary
	err := Command("/no-exist-binary").Run()
	if err == nil {
		t.Error("expected error from /no-exist-binary")
	}
}

func TestExitStatus(t *testing.T) {
	// Test that exit values are returned correctly
	err := helperCommand("exit", "42").Run()
	if werr, ok := err.(*ExitError); ok {
		if s, e := werr.Error(), "exit status 42"; s != e {
			t.Errorf("from exit 42 got exit %q, want %q", s, e)
		}
	} else {
		t.Fatalf("expected *ExitError from exit 42; got %T: %v", err, err)
	}
}

func TestPipes(t *testing.T) {
	check := func(what string, err error) {
		if err != nil {
			t.Fatalf("%s: %v", what, err)
		}
	}
	// Cat, testing stdin and stdout.
	c := helperCommand("pipetest")
	stdin, err := c.StdinPipe()
	check("StdinPipe", err)
	stdout, err := c.StdoutPipe()
	check("StdoutPipe", err)
	stderr, err := c.StderrPipe()
	check("StderrPipe", err)

	outbr := bufio.NewReader(stdout)
	errbr := bufio.NewReader(stderr)
	line := func(what string, br *bufio.Reader) string {
		line, _, err := br.ReadLine()
		if err != nil {
			t.Fatalf("%s: %v", what, err)
		}
		return string(line)
	}

	err = c.Start()
	check("Start", err)

	_, err = stdin.Write([]byte("O:I am output\n"))
	check("first stdin Write", err)
	if g, e := line("first output line", outbr), "O:I am output"; g != e {
		t.Errorf("got %q, want %q", g, e)
	}

	_, err = stdin.Write([]byte("E:I am error\n"))
	check("second stdin Write", err)
	if g, e := line("first error line", errbr), "E:I am error"; g != e {
		t.Errorf("got %q, want %q", g, e)
	}

	_, err = stdin.Write([]byte("O:I am output2\n"))
	check("third stdin Write 3", err)
	if g, e := line("second output line", outbr), "O:I am output2"; g != e {
		t.Errorf("got %q, want %q", g, e)
	}

	stdin.Close()
	err = c.Wait()
	check("Wait", err)
}

var testedAlreadyLeaked = false

func TestExtraFiles(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("no operating system support; skipping")
	}

	// Ensure that file descriptors have not already been leaked into
	// our environment.
	if !testedAlreadyLeaked {
		testedAlreadyLeaked = true
		for fd := os.Stderr.Fd() + 1; fd <= 101; fd++ {
			err := os.NewFile(fd, "").Close()
			if err == nil {
				t.Logf("Something already leaked - closed fd %d", fd)
			}
		}
	}

	// Force network usage, to verify the epoll (or whatever) fd
	// doesn't leak to the child,
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatal(err)
	}
	defer ln.Close()

	// Make sure duplicated fds don't leak to the child.
	f, err := ln.(*net.TCPListener).File()
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	ln2, err := net.FileListener(f)
	if err != nil {
		t.Fatal(err)
	}
	defer ln2.Close()

	// Force TLS root certs to be loaded (which might involve
	// cgo), to make sure none of that potential C code leaks fds.
	ts := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Hello"))
	}))
	defer ts.Close()
	http.Get(ts.URL) // ignore result; just calling to force root cert loading

	tf, err := ioutil.TempFile("", "")
	if err != nil {
		t.Fatalf("TempFile: %v", err)
	}
	defer os.Remove(tf.Name())
	defer tf.Close()

	const text = "Hello, fd 3!"
	_, err = tf.Write([]byte(text))
	if err != nil {
		t.Fatalf("Write: %v", err)
	}
	_, err = tf.Seek(0, os.SEEK_SET)
	if err != nil {
		t.Fatalf("Seek: %v", err)
	}

	c := helperCommand("read3")
	c.ExtraFiles = []*os.File{tf}
	bs, err := c.CombinedOutput()
	if err != nil {
		t.Fatalf("CombinedOutput: %v; output %q", err, bs)
	}
	if string(bs) != text {
		t.Errorf("got %q; want %q", string(bs), text)
	}
}

func TestExtraFilesRace(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("no operating system support; skipping")
	}
	listen := func() net.Listener {
		ln, err := net.Listen("tcp", "127.0.0.1:0")
		if err != nil {
			t.Fatal(err)
		}
		return ln
	}
	listenerFile := func(ln net.Listener) *os.File {
		f, err := ln.(*net.TCPListener).File()
		if err != nil {
			t.Fatal(err)
		}
		return f
	}
	runCommand := func(c *Cmd, out chan<- string) {
		bout, err := c.CombinedOutput()
		if err != nil {
			out <- "ERROR:" + err.Error()
		} else {
			out <- string(bout)
		}
	}

	for i := 0; i < 10; i++ {
		la := listen()
		ca := helperCommand("describefiles")
		ca.ExtraFiles = []*os.File{listenerFile(la)}
		lb := listen()
		cb := helperCommand("describefiles")
		cb.ExtraFiles = []*os.File{listenerFile(lb)}
		ares := make(chan string)
		bres := make(chan string)
		go runCommand(ca, ares)
		go runCommand(cb, bres)
		if got, want := <-ares, fmt.Sprintf("fd3: listener %s\n", la.Addr()); got != want {
			t.Errorf("iteration %d, process A got:\n%s\nwant:\n%s\n", i, got, want)
		}
		if got, want := <-bres, fmt.Sprintf("fd3: listener %s\n", lb.Addr()); got != want {
			t.Errorf("iteration %d, process B got:\n%s\nwant:\n%s\n", i, got, want)
		}
		la.Close()
		lb.Close()
	}
}

// TestHelperProcess isn't a real test. It's used as a helper process
// for TestParameterRun.
func TestHelperProcess(*testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
		return
	}
	defer os.Exit(0)

	// Determine which command to use to display open files.
	ofcmd := "lsof"
	switch runtime.GOOS {
	case "freebsd", "netbsd", "openbsd":
		ofcmd = "fstat"
	}

	args := os.Args
	for len(args) > 0 {
		if args[0] == "--" {
			args = args[1:]
			break
		}
		args = args[1:]
	}
	if len(args) == 0 {
		fmt.Fprintf(os.Stderr, "No command\n")
		os.Exit(2)
	}

	cmd, args := args[0], args[1:]
	switch cmd {
	case "echo":
		iargs := []interface{}{}
		for _, s := range args {
			iargs = append(iargs, s)
		}
		fmt.Println(iargs...)
	case "cat":
		if len(args) == 0 {
			io.Copy(os.Stdout, os.Stdin)
			return
		}
		exit := 0
		for _, fn := range args {
			f, err := os.Open(fn)
			if err != nil {
				fmt.Fprintf(os.Stderr, "Error: %v\n", err)
				exit = 2
			} else {
				defer f.Close()
				io.Copy(os.Stdout, f)
			}
		}
		os.Exit(exit)
	case "pipetest":
		bufr := bufio.NewReader(os.Stdin)
		for {
			line, _, err := bufr.ReadLine()
			if err == io.EOF {
				break
			} else if err != nil {
				os.Exit(1)
			}
			if bytes.HasPrefix(line, []byte("O:")) {
				os.Stdout.Write(line)
				os.Stdout.Write([]byte{'\n'})
			} else if bytes.HasPrefix(line, []byte("E:")) {
				os.Stderr.Write(line)
				os.Stderr.Write([]byte{'\n'})
			} else {
				os.Exit(1)
			}
		}
	case "read3": // read fd 3
		fd3 := os.NewFile(3, "fd3")
		bs, err := ioutil.ReadAll(fd3)
		if err != nil {
			fmt.Printf("ReadAll from fd 3: %v", err)
			os.Exit(1)
		}
		switch runtime.GOOS {
		case "darwin":
			// TODO(bradfitz): broken? Sometimes.
			// http://golang.org/issue/2603
			// Skip this additional part of the test for now.
		case "netbsd":
			// TODO(jsing): This currently fails on NetBSD due to
			// the cloned file descriptors that result from opening
			// /dev/urandom.
			// http://golang.org/issue/3955
		default:
			// Now verify that there are no other open fds.
			var files []*os.File
			for wantfd := os.Stderr.Fd() + 2; wantfd <= 100; wantfd++ {
				f, err := os.Open(os.Args[0])
				if err != nil {
					fmt.Printf("error opening file with expected fd %d: %v", wantfd, err)
					os.Exit(1)
				}
				if got := f.Fd(); got != wantfd {
					fmt.Printf("leaked parent file. fd = %d; want %d\n", got, wantfd)
					out, _ := Command(ofcmd, "-p", fmt.Sprint(os.Getpid())).CombinedOutput()
					fmt.Print(string(out))
					os.Exit(1)
				}
				files = append(files, f)
			}
			for _, f := range files {
				f.Close()
			}
		}
		// Referring to fd3 here ensures that it is not
		// garbage collected, and therefore closed, while
		// executing the wantfd loop above.  It doesn't matter
		// what we do with fd3 as long as we refer to it;
		// closing it is the easy choice.
		fd3.Close()
		os.Stderr.Write(bs)
	case "exit":
		n, _ := strconv.Atoi(args[0])
		os.Exit(n)
	case "describefiles":
		for fd := uintptr(3); fd < 25; fd++ {
			f := os.NewFile(fd, fmt.Sprintf("fd-%d", fd))
			ln, err := net.FileListener(f)
			if err == nil {
				fmt.Printf("fd%d: listener %s\n", fd, ln.Addr())
				ln.Close()
			}
		}
		os.Exit(0)
	default:
		fmt.Fprintf(os.Stderr, "Unknown command %q\n", cmd)
		os.Exit(2)
	}
}