summaryrefslogtreecommitdiffstats
path: root/src/os/exec
diff options
context:
space:
mode:
Diffstat (limited to 'src/os/exec')
-rw-r--r--src/os/exec/bench_test.go23
-rw-r--r--src/os/exec/env_test.go39
-rw-r--r--src/os/exec/example_test.go155
-rw-r--r--src/os/exec/exec.go789
-rw-r--r--src/os/exec/exec_linux_test.go45
-rw-r--r--src/os/exec/exec_plan9.go19
-rw-r--r--src/os/exec/exec_posix_test.go88
-rw-r--r--src/os/exec/exec_test.go1176
-rw-r--r--src/os/exec/exec_unix.go24
-rw-r--r--src/os/exec/exec_windows.go23
-rw-r--r--src/os/exec/internal_test.go61
-rw-r--r--src/os/exec/lp_js.go23
-rw-r--r--src/os/exec/lp_plan9.go56
-rw-r--r--src/os/exec/lp_test.go33
-rw-r--r--src/os/exec/lp_unix.go59
-rw-r--r--src/os/exec/lp_unix_test.go54
-rw-r--r--src/os/exec/lp_windows.go94
-rw-r--r--src/os/exec/lp_windows_test.go577
-rw-r--r--src/os/exec/read3.go101
19 files changed, 3439 insertions, 0 deletions
diff --git a/src/os/exec/bench_test.go b/src/os/exec/bench_test.go
new file mode 100644
index 0000000..9a94001
--- /dev/null
+++ b/src/os/exec/bench_test.go
@@ -0,0 +1,23 @@
+// Copyright 2019 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 (
+ "testing"
+)
+
+func BenchmarkExecHostname(b *testing.B) {
+ b.ReportAllocs()
+ path, err := LookPath("hostname")
+ if err != nil {
+ b.Fatalf("could not find hostname: %v", err)
+ }
+ b.ResetTimer()
+ for i := 0; i < b.N; i++ {
+ if err := Command(path).Run(); err != nil {
+ b.Fatalf("hostname: %v", err)
+ }
+ }
+}
diff --git a/src/os/exec/env_test.go b/src/os/exec/env_test.go
new file mode 100644
index 0000000..b5ac398
--- /dev/null
+++ b/src/os/exec/env_test.go
@@ -0,0 +1,39 @@
+// Copyright 2017 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 (
+ "reflect"
+ "testing"
+)
+
+func TestDedupEnv(t *testing.T) {
+ tests := []struct {
+ noCase bool
+ in []string
+ want []string
+ }{
+ {
+ noCase: true,
+ in: []string{"k1=v1", "k2=v2", "K1=v3"},
+ want: []string{"K1=v3", "k2=v2"},
+ },
+ {
+ noCase: false,
+ in: []string{"k1=v1", "K1=V2", "k1=v3"},
+ want: []string{"k1=v3", "K1=V2"},
+ },
+ {
+ in: []string{"=a", "=b", "foo", "bar"},
+ want: []string{"=b", "foo", "bar"},
+ },
+ }
+ for _, tt := range tests {
+ got := dedupEnvCase(tt.noCase, tt.in)
+ if !reflect.DeepEqual(got, tt.want) {
+ t.Errorf("Dedup(%v, %q) = %q; want %q", tt.noCase, tt.in, got, tt.want)
+ }
+ }
+}
diff --git a/src/os/exec/example_test.go b/src/os/exec/example_test.go
new file mode 100644
index 0000000..a66890b
--- /dev/null
+++ b/src/os/exec/example_test.go
@@ -0,0 +1,155 @@
+// Copyright 2012 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_test
+
+import (
+ "bytes"
+ "context"
+ "encoding/json"
+ "fmt"
+ "io"
+ "log"
+ "os"
+ "os/exec"
+ "strings"
+ "time"
+)
+
+func ExampleLookPath() {
+ path, err := exec.LookPath("fortune")
+ if err != nil {
+ log.Fatal("installing fortune is in your future")
+ }
+ fmt.Printf("fortune is available at %s\n", path)
+}
+
+func ExampleCommand() {
+ cmd := exec.Command("tr", "a-z", "A-Z")
+ cmd.Stdin = strings.NewReader("some input")
+ var out bytes.Buffer
+ cmd.Stdout = &out
+ err := cmd.Run()
+ if err != nil {
+ log.Fatal(err)
+ }
+ fmt.Printf("in all caps: %q\n", out.String())
+}
+
+func ExampleCommand_environment() {
+ cmd := exec.Command("prog")
+ cmd.Env = append(os.Environ(),
+ "FOO=duplicate_value", // ignored
+ "FOO=actual_value", // this value is used
+ )
+ if err := cmd.Run(); err != nil {
+ log.Fatal(err)
+ }
+}
+
+func ExampleCmd_Output() {
+ out, err := exec.Command("date").Output()
+ if err != nil {
+ log.Fatal(err)
+ }
+ fmt.Printf("The date is %s\n", out)
+}
+
+func ExampleCmd_Run() {
+ cmd := exec.Command("sleep", "1")
+ log.Printf("Running command and waiting for it to finish...")
+ err := cmd.Run()
+ log.Printf("Command finished with error: %v", err)
+}
+
+func ExampleCmd_Start() {
+ cmd := exec.Command("sleep", "5")
+ err := cmd.Start()
+ if err != nil {
+ log.Fatal(err)
+ }
+ log.Printf("Waiting for command to finish...")
+ err = cmd.Wait()
+ log.Printf("Command finished with error: %v", err)
+}
+
+func ExampleCmd_StdoutPipe() {
+ cmd := exec.Command("echo", "-n", `{"Name": "Bob", "Age": 32}`)
+ stdout, err := cmd.StdoutPipe()
+ if err != nil {
+ log.Fatal(err)
+ }
+ if err := cmd.Start(); err != nil {
+ log.Fatal(err)
+ }
+ var person struct {
+ Name string
+ Age int
+ }
+ if err := json.NewDecoder(stdout).Decode(&person); err != nil {
+ log.Fatal(err)
+ }
+ if err := cmd.Wait(); err != nil {
+ log.Fatal(err)
+ }
+ fmt.Printf("%s is %d years old\n", person.Name, person.Age)
+}
+
+func ExampleCmd_StdinPipe() {
+ cmd := exec.Command("cat")
+ stdin, err := cmd.StdinPipe()
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ go func() {
+ defer stdin.Close()
+ io.WriteString(stdin, "values written to stdin are passed to cmd's standard input")
+ }()
+
+ out, err := cmd.CombinedOutput()
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ fmt.Printf("%s\n", out)
+}
+
+func ExampleCmd_StderrPipe() {
+ cmd := exec.Command("sh", "-c", "echo stdout; echo 1>&2 stderr")
+ stderr, err := cmd.StderrPipe()
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ if err := cmd.Start(); err != nil {
+ log.Fatal(err)
+ }
+
+ slurp, _ := io.ReadAll(stderr)
+ fmt.Printf("%s\n", slurp)
+
+ if err := cmd.Wait(); err != nil {
+ log.Fatal(err)
+ }
+}
+
+func ExampleCmd_CombinedOutput() {
+ cmd := exec.Command("sh", "-c", "echo stdout; echo 1>&2 stderr")
+ stdoutStderr, err := cmd.CombinedOutput()
+ if err != nil {
+ log.Fatal(err)
+ }
+ fmt.Printf("%s\n", stdoutStderr)
+}
+
+func ExampleCommandContext() {
+ ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+ defer cancel()
+
+ if err := exec.CommandContext(ctx, "sleep", "5").Run(); err != nil {
+ // This will fail after 100 milliseconds. The 5 second sleep
+ // will be interrupted.
+ }
+}
diff --git a/src/os/exec/exec.go b/src/os/exec/exec.go
new file mode 100644
index 0000000..0c49575
--- /dev/null
+++ b/src/os/exec/exec.go
@@ -0,0 +1,789 @@
+// 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 runs external commands. It wraps os.StartProcess to make it
+// easier to remap stdin and stdout, connect I/O with pipes, and do other
+// adjustments.
+//
+// Unlike the "system" library call from C and other languages, the
+// os/exec package intentionally does not invoke the system shell and
+// does not expand any glob patterns or handle other expansions,
+// pipelines, or redirections typically done by shells. The package
+// behaves more like C's "exec" family of functions. To expand glob
+// patterns, either call the shell directly, taking care to escape any
+// dangerous input, or use the path/filepath package's Glob function.
+// To expand environment variables, use package os's ExpandEnv.
+//
+// Note that the examples in this package assume a Unix system.
+// They may not run on Windows, and they do not run in the Go Playground
+// used by golang.org and godoc.org.
+package exec
+
+import (
+ "bytes"
+ "context"
+ "errors"
+ "internal/syscall/execenv"
+ "io"
+ "os"
+ "path/filepath"
+ "runtime"
+ "strconv"
+ "strings"
+ "sync"
+ "syscall"
+)
+
+// Error is returned by LookPath when it fails to classify a file as an
+// executable.
+type Error struct {
+ // Name is the file name for which the error occurred.
+ Name string
+ // Err is the underlying error.
+ Err error
+}
+
+func (e *Error) Error() string {
+ return "exec: " + strconv.Quote(e.Name) + ": " + e.Err.Error()
+}
+
+func (e *Error) Unwrap() error { return e.Err }
+
+// Cmd represents an external command being prepared or run.
+//
+// A Cmd cannot be reused after calling its Run, Output or CombinedOutput
+// methods.
+type Cmd struct {
+ // Path is the path of the command to run.
+ //
+ // This is the only field that must be set to a non-zero
+ // value. If Path is relative, it is evaluated relative
+ // to Dir.
+ Path string
+
+ // Args holds command line arguments, including the command as Args[0].
+ // If the Args field is empty or nil, Run uses {Path}.
+ //
+ // In typical use, both Path and Args are set by calling Command.
+ Args []string
+
+ // Env specifies the environment of the process.
+ // Each entry is of the form "key=value".
+ // If Env is nil, the new process uses the current process's
+ // environment.
+ // If Env contains duplicate environment keys, only the last
+ // value in the slice for each duplicate key is used.
+ // As a special case on Windows, SYSTEMROOT is always added if
+ // missing and not explicitly set to the empty string.
+ Env []string
+
+ // Dir specifies the working directory of the command.
+ // If Dir is the empty string, Run runs the command in the
+ // calling process's current directory.
+ Dir string
+
+ // Stdin specifies the process's standard input.
+ //
+ // If Stdin is nil, the process reads from the null device (os.DevNull).
+ //
+ // If Stdin is an *os.File, the process's standard input is connected
+ // directly to that file.
+ //
+ // Otherwise, during the execution of the command a separate
+ // goroutine reads from Stdin and delivers that data to the command
+ // over a pipe. In this case, Wait does not complete until the goroutine
+ // stops copying, either because it has reached the end of Stdin
+ // (EOF or a read error) or because writing to the pipe returned an error.
+ Stdin io.Reader
+
+ // Stdout and Stderr specify the process's standard output and error.
+ //
+ // If either is nil, Run connects the corresponding file descriptor
+ // to the null device (os.DevNull).
+ //
+ // If either is an *os.File, the corresponding output from the process
+ // is connected directly to that file.
+ //
+ // Otherwise, during the execution of the command a separate goroutine
+ // reads from the process over a pipe and delivers that data to the
+ // corresponding Writer. In this case, Wait does not complete until the
+ // goroutine reaches EOF or encounters an error.
+ //
+ // If Stdout and Stderr are the same writer, and have a type that can
+ // be compared with ==, at most one goroutine at a time will call Write.
+ Stdout io.Writer
+ Stderr io.Writer
+
+ // ExtraFiles specifies additional open files to be inherited by the
+ // new process. It does not include standard input, standard output, or
+ // standard error. If non-nil, entry i becomes file descriptor 3+i.
+ //
+ // ExtraFiles is not supported on Windows.
+ ExtraFiles []*os.File
+
+ // SysProcAttr holds optional, operating system-specific attributes.
+ // Run passes it to os.StartProcess as the os.ProcAttr's Sys field.
+ SysProcAttr *syscall.SysProcAttr
+
+ // Process is the underlying process, once started.
+ Process *os.Process
+
+ // ProcessState contains information about an exited process,
+ // available after a call to Wait or Run.
+ ProcessState *os.ProcessState
+
+ ctx context.Context // nil means none
+ lookPathErr error // LookPath error, if any.
+ finished bool // when Wait was called
+ childFiles []*os.File
+ closeAfterStart []io.Closer
+ closeAfterWait []io.Closer
+ goroutine []func() error
+ errch chan error // one send per goroutine
+ waitDone chan struct{}
+}
+
+// Command returns the Cmd struct to execute the named program with
+// the given arguments.
+//
+// It sets only the Path and Args in the returned structure.
+//
+// If name contains no path separators, Command uses LookPath to
+// resolve name to a complete path if possible. Otherwise it uses name
+// directly as Path.
+//
+// The returned Cmd's Args field is constructed from the command name
+// followed by the elements of arg, so arg should not include the
+// command name itself. For example, Command("echo", "hello").
+// Args[0] is always name, not the possibly resolved Path.
+//
+// On Windows, processes receive the whole command line as a single string
+// and do their own parsing. Command combines and quotes Args into a command
+// line string with an algorithm compatible with applications using
+// CommandLineToArgvW (which is the most common way). Notable exceptions are
+// msiexec.exe and cmd.exe (and thus, all batch files), which have a different
+// unquoting algorithm. In these or other similar cases, you can do the
+// quoting yourself and provide the full command line in SysProcAttr.CmdLine,
+// leaving Args empty.
+func Command(name string, arg ...string) *Cmd {
+ cmd := &Cmd{
+ Path: name,
+ Args: append([]string{name}, arg...),
+ }
+ if filepath.Base(name) == name {
+ if lp, err := LookPath(name); err != nil {
+ cmd.lookPathErr = err
+ } else {
+ cmd.Path = lp
+ }
+ }
+ return cmd
+}
+
+// CommandContext is like Command but includes a context.
+//
+// The provided context is used to kill the process (by calling
+// os.Process.Kill) if the context becomes done before the command
+// completes on its own.
+func CommandContext(ctx context.Context, name string, arg ...string) *Cmd {
+ if ctx == nil {
+ panic("nil Context")
+ }
+ cmd := Command(name, arg...)
+ cmd.ctx = ctx
+ return cmd
+}
+
+// String returns a human-readable description of c.
+// It is intended only for debugging.
+// In particular, it is not suitable for use as input to a shell.
+// The output of String may vary across Go releases.
+func (c *Cmd) String() string {
+ if c.lookPathErr != nil {
+ // failed to resolve path; report the original requested path (plus args)
+ return strings.Join(c.Args, " ")
+ }
+ // report the exact executable path (plus args)
+ b := new(strings.Builder)
+ b.WriteString(c.Path)
+ for _, a := range c.Args[1:] {
+ b.WriteByte(' ')
+ b.WriteString(a)
+ }
+ return b.String()
+}
+
+// interfaceEqual protects against panics from doing equality tests on
+// two interfaces with non-comparable underlying types.
+func interfaceEqual(a, b interface{}) bool {
+ defer func() {
+ recover()
+ }()
+ return a == b
+}
+
+func (c *Cmd) envv() ([]string, error) {
+ if c.Env != nil {
+ return c.Env, nil
+ }
+ return execenv.Default(c.SysProcAttr)
+}
+
+func (c *Cmd) argv() []string {
+ if len(c.Args) > 0 {
+ return c.Args
+ }
+ return []string{c.Path}
+}
+
+// skipStdinCopyError optionally specifies a function which reports
+// whether the provided stdin copy error should be ignored.
+var skipStdinCopyError func(error) bool
+
+func (c *Cmd) stdin() (f *os.File, err error) {
+ if c.Stdin == nil {
+ f, err = os.Open(os.DevNull)
+ if err != nil {
+ return
+ }
+ c.closeAfterStart = append(c.closeAfterStart, f)
+ return
+ }
+
+ if f, ok := c.Stdin.(*os.File); ok {
+ return f, nil
+ }
+
+ pr, pw, err := os.Pipe()
+ if err != nil {
+ return
+ }
+
+ c.closeAfterStart = append(c.closeAfterStart, pr)
+ c.closeAfterWait = append(c.closeAfterWait, pw)
+ c.goroutine = append(c.goroutine, func() error {
+ _, err := io.Copy(pw, c.Stdin)
+ if skip := skipStdinCopyError; skip != nil && skip(err) {
+ err = nil
+ }
+ if err1 := pw.Close(); err == nil {
+ err = err1
+ }
+ return err
+ })
+ return pr, nil
+}
+
+func (c *Cmd) stdout() (f *os.File, err error) {
+ return c.writerDescriptor(c.Stdout)
+}
+
+func (c *Cmd) stderr() (f *os.File, err error) {
+ if c.Stderr != nil && interfaceEqual(c.Stderr, c.Stdout) {
+ return c.childFiles[1], nil
+ }
+ return c.writerDescriptor(c.Stderr)
+}
+
+func (c *Cmd) writerDescriptor(w io.Writer) (f *os.File, err error) {
+ if w == nil {
+ f, err = os.OpenFile(os.DevNull, os.O_WRONLY, 0)
+ if err != nil {
+ return
+ }
+ c.closeAfterStart = append(c.closeAfterStart, f)
+ return
+ }
+
+ if f, ok := w.(*os.File); ok {
+ return f, nil
+ }
+
+ pr, pw, err := os.Pipe()
+ if err != nil {
+ return
+ }
+
+ c.closeAfterStart = append(c.closeAfterStart, pw)
+ c.closeAfterWait = append(c.closeAfterWait, pr)
+ c.goroutine = append(c.goroutine, func() error {
+ _, err := io.Copy(w, pr)
+ pr.Close() // in case io.Copy stopped due to write error
+ return err
+ })
+ return pw, nil
+}
+
+func (c *Cmd) closeDescriptors(closers []io.Closer) {
+ for _, fd := range closers {
+ fd.Close()
+ }
+}
+
+// Run starts the specified command and waits for it to complete.
+//
+// The returned error is nil if the command runs, has no problems
+// copying stdin, stdout, and stderr, and exits with a zero exit
+// status.
+//
+// If the command starts but does not complete successfully, the error is of
+// type *ExitError. Other error types may be returned for other situations.
+//
+// If the calling goroutine has locked the operating system thread
+// with runtime.LockOSThread and modified any inheritable OS-level
+// thread state (for example, Linux or Plan 9 name spaces), the new
+// process will inherit the caller's thread state.
+func (c *Cmd) Run() error {
+ if err := c.Start(); err != nil {
+ return err
+ }
+ return c.Wait()
+}
+
+// lookExtensions finds windows executable by its dir and path.
+// It uses LookPath to try appropriate extensions.
+// lookExtensions does not search PATH, instead it converts `prog` into `.\prog`.
+func lookExtensions(path, dir string) (string, error) {
+ if filepath.Base(path) == path {
+ path = filepath.Join(".", path)
+ }
+ if dir == "" {
+ return LookPath(path)
+ }
+ if filepath.VolumeName(path) != "" {
+ return LookPath(path)
+ }
+ if len(path) > 1 && os.IsPathSeparator(path[0]) {
+ return LookPath(path)
+ }
+ dirandpath := filepath.Join(dir, path)
+ // We assume that LookPath will only add file extension.
+ lp, err := LookPath(dirandpath)
+ if err != nil {
+ return "", err
+ }
+ ext := strings.TrimPrefix(lp, dirandpath)
+ return path + ext, nil
+}
+
+// Start starts the specified command but does not wait for it to complete.
+//
+// If Start returns successfully, the c.Process field will be set.
+//
+// The Wait method will return the exit code and release associated resources
+// once the command exits.
+func (c *Cmd) Start() error {
+ if c.lookPathErr != nil {
+ c.closeDescriptors(c.closeAfterStart)
+ c.closeDescriptors(c.closeAfterWait)
+ return c.lookPathErr
+ }
+ if runtime.GOOS == "windows" {
+ lp, err := lookExtensions(c.Path, c.Dir)
+ if err != nil {
+ c.closeDescriptors(c.closeAfterStart)
+ c.closeDescriptors(c.closeAfterWait)
+ return err
+ }
+ c.Path = lp
+ }
+ if c.Process != nil {
+ return errors.New("exec: already started")
+ }
+ if c.ctx != nil {
+ select {
+ case <-c.ctx.Done():
+ c.closeDescriptors(c.closeAfterStart)
+ c.closeDescriptors(c.closeAfterWait)
+ return c.ctx.Err()
+ default:
+ }
+ }
+
+ c.childFiles = make([]*os.File, 0, 3+len(c.ExtraFiles))
+ type F func(*Cmd) (*os.File, error)
+ for _, setupFd := range []F{(*Cmd).stdin, (*Cmd).stdout, (*Cmd).stderr} {
+ fd, err := setupFd(c)
+ if err != nil {
+ c.closeDescriptors(c.closeAfterStart)
+ c.closeDescriptors(c.closeAfterWait)
+ return err
+ }
+ c.childFiles = append(c.childFiles, fd)
+ }
+ c.childFiles = append(c.childFiles, c.ExtraFiles...)
+
+ envv, err := c.envv()
+ if err != nil {
+ return err
+ }
+
+ c.Process, err = os.StartProcess(c.Path, c.argv(), &os.ProcAttr{
+ Dir: c.Dir,
+ Files: c.childFiles,
+ Env: addCriticalEnv(dedupEnv(envv)),
+ Sys: c.SysProcAttr,
+ })
+ if err != nil {
+ c.closeDescriptors(c.closeAfterStart)
+ c.closeDescriptors(c.closeAfterWait)
+ return err
+ }
+
+ c.closeDescriptors(c.closeAfterStart)
+
+ // Don't allocate the channel unless there are goroutines to fire.
+ if len(c.goroutine) > 0 {
+ c.errch = make(chan error, len(c.goroutine))
+ for _, fn := range c.goroutine {
+ go func(fn func() error) {
+ c.errch <- fn()
+ }(fn)
+ }
+ }
+
+ if c.ctx != nil {
+ c.waitDone = make(chan struct{})
+ go func() {
+ select {
+ case <-c.ctx.Done():
+ c.Process.Kill()
+ case <-c.waitDone:
+ }
+ }()
+ }
+
+ return nil
+}
+
+// An ExitError reports an unsuccessful exit by a command.
+type ExitError struct {
+ *os.ProcessState
+
+ // Stderr holds a subset of the standard error output from the
+ // Cmd.Output method if standard error was not otherwise being
+ // collected.
+ //
+ // If the error output is long, Stderr may contain only a prefix
+ // and suffix of the output, with the middle replaced with
+ // text about the number of omitted bytes.
+ //
+ // Stderr is provided for debugging, for inclusion in error messages.
+ // Users with other needs should redirect Cmd.Stderr as needed.
+ Stderr []byte
+}
+
+func (e *ExitError) Error() string {
+ return e.ProcessState.String()
+}
+
+// Wait waits for the command to exit and waits for any copying to
+// stdin or copying from stdout or stderr to complete.
+//
+// The command must have been started by Start.
+//
+// The returned error is nil if the command runs, has no problems
+// copying stdin, stdout, and stderr, and exits with a zero exit
+// status.
+//
+// If the command fails to run or doesn't complete successfully, the
+// error is of type *ExitError. Other error types may be
+// returned for I/O problems.
+//
+// If any of c.Stdin, c.Stdout or c.Stderr are not an *os.File, Wait also waits
+// for the respective I/O loop copying to or from the process to complete.
+//
+// Wait releases any resources associated with the Cmd.
+func (c *Cmd) Wait() error {
+ if c.Process == nil {
+ return errors.New("exec: not started")
+ }
+ if c.finished {
+ return errors.New("exec: Wait was already called")
+ }
+ c.finished = true
+
+ state, err := c.Process.Wait()
+ if c.waitDone != nil {
+ close(c.waitDone)
+ }
+ c.ProcessState = state
+
+ var copyError error
+ for range c.goroutine {
+ if err := <-c.errch; err != nil && copyError == nil {
+ copyError = err
+ }
+ }
+
+ c.closeDescriptors(c.closeAfterWait)
+
+ if err != nil {
+ return err
+ } else if !state.Success() {
+ return &ExitError{ProcessState: state}
+ }
+
+ return copyError
+}
+
+// Output runs the command and returns its standard output.
+// Any returned error will usually be of type *ExitError.
+// If c.Stderr was nil, Output populates ExitError.Stderr.
+func (c *Cmd) Output() ([]byte, error) {
+ if c.Stdout != nil {
+ return nil, errors.New("exec: Stdout already set")
+ }
+ var stdout bytes.Buffer
+ c.Stdout = &stdout
+
+ captureErr := c.Stderr == nil
+ if captureErr {
+ c.Stderr = &prefixSuffixSaver{N: 32 << 10}
+ }
+
+ err := c.Run()
+ if err != nil && captureErr {
+ if ee, ok := err.(*ExitError); ok {
+ ee.Stderr = c.Stderr.(*prefixSuffixSaver).Bytes()
+ }
+ }
+ return stdout.Bytes(), err
+}
+
+// CombinedOutput runs the command and returns its combined standard
+// output and standard error.
+func (c *Cmd) CombinedOutput() ([]byte, error) {
+ if c.Stdout != nil {
+ return nil, errors.New("exec: Stdout already set")
+ }
+ if c.Stderr != nil {
+ return nil, errors.New("exec: Stderr already set")
+ }
+ var b bytes.Buffer
+ c.Stdout = &b
+ c.Stderr = &b
+ err := c.Run()
+ return b.Bytes(), err
+}
+
+// StdinPipe returns a pipe that will be connected to the command's
+// standard input when the command starts.
+// The pipe will be closed automatically after Wait sees the command exit.
+// A caller need only call Close to force the pipe to close sooner.
+// For example, if the command being run will not exit until standard input
+// is closed, the caller must close the pipe.
+func (c *Cmd) StdinPipe() (io.WriteCloser, error) {
+ if c.Stdin != nil {
+ return nil, errors.New("exec: Stdin already set")
+ }
+ if c.Process != nil {
+ return nil, errors.New("exec: StdinPipe after process started")
+ }
+ pr, pw, err := os.Pipe()
+ if err != nil {
+ return nil, err
+ }
+ c.Stdin = pr
+ c.closeAfterStart = append(c.closeAfterStart, pr)
+ wc := &closeOnce{File: pw}
+ c.closeAfterWait = append(c.closeAfterWait, wc)
+ return wc, nil
+}
+
+type closeOnce struct {
+ *os.File
+
+ once sync.Once
+ err error
+}
+
+func (c *closeOnce) Close() error {
+ c.once.Do(c.close)
+ return c.err
+}
+
+func (c *closeOnce) close() {
+ c.err = c.File.Close()
+}
+
+// StdoutPipe returns a pipe that will be connected to the command's
+// standard output when the command starts.
+//
+// Wait will close the pipe after seeing the command exit, so most callers
+// need not close the pipe themselves. It is thus incorrect to call Wait
+// before all reads from the pipe have completed.
+// For the same reason, it is incorrect to call Run when using StdoutPipe.
+// See the example for idiomatic usage.
+func (c *Cmd) StdoutPipe() (io.ReadCloser, error) {
+ if c.Stdout != nil {
+ return nil, errors.New("exec: Stdout already set")
+ }
+ if c.Process != nil {
+ return nil, errors.New("exec: StdoutPipe after process started")
+ }
+ pr, pw, err := os.Pipe()
+ if err != nil {
+ return nil, err
+ }
+ c.Stdout = pw
+ c.closeAfterStart = append(c.closeAfterStart, pw)
+ c.closeAfterWait = append(c.closeAfterWait, pr)
+ return pr, nil
+}
+
+// StderrPipe returns a pipe that will be connected to the command's
+// standard error when the command starts.
+//
+// Wait will close the pipe after seeing the command exit, so most callers
+// need not close the pipe themselves. It is thus incorrect to call Wait
+// before all reads from the pipe have completed.
+// For the same reason, it is incorrect to use Run when using StderrPipe.
+// See the StdoutPipe example for idiomatic usage.
+func (c *Cmd) StderrPipe() (io.ReadCloser, error) {
+ if c.Stderr != nil {
+ return nil, errors.New("exec: Stderr already set")
+ }
+ if c.Process != nil {
+ return nil, errors.New("exec: StderrPipe after process started")
+ }
+ pr, pw, err := os.Pipe()
+ if err != nil {
+ return nil, err
+ }
+ c.Stderr = pw
+ c.closeAfterStart = append(c.closeAfterStart, pw)
+ c.closeAfterWait = append(c.closeAfterWait, pr)
+ return pr, nil
+}
+
+// prefixSuffixSaver is an io.Writer which retains the first N bytes
+// and the last N bytes written to it. The Bytes() methods reconstructs
+// it with a pretty error message.
+type prefixSuffixSaver struct {
+ N int // max size of prefix or suffix
+ prefix []byte
+ suffix []byte // ring buffer once len(suffix) == N
+ suffixOff int // offset to write into suffix
+ skipped int64
+
+ // TODO(bradfitz): we could keep one large []byte and use part of it for
+ // the prefix, reserve space for the '... Omitting N bytes ...' message,
+ // then the ring buffer suffix, and just rearrange the ring buffer
+ // suffix when Bytes() is called, but it doesn't seem worth it for
+ // now just for error messages. It's only ~64KB anyway.
+}
+
+func (w *prefixSuffixSaver) Write(p []byte) (n int, err error) {
+ lenp := len(p)
+ p = w.fill(&w.prefix, p)
+
+ // Only keep the last w.N bytes of suffix data.
+ if overage := len(p) - w.N; overage > 0 {
+ p = p[overage:]
+ w.skipped += int64(overage)
+ }
+ p = w.fill(&w.suffix, p)
+
+ // w.suffix is full now if p is non-empty. Overwrite it in a circle.
+ for len(p) > 0 { // 0, 1, or 2 iterations.
+ n := copy(w.suffix[w.suffixOff:], p)
+ p = p[n:]
+ w.skipped += int64(n)
+ w.suffixOff += n
+ if w.suffixOff == w.N {
+ w.suffixOff = 0
+ }
+ }
+ return lenp, nil
+}
+
+// fill appends up to len(p) bytes of p to *dst, such that *dst does not
+// grow larger than w.N. It returns the un-appended suffix of p.
+func (w *prefixSuffixSaver) fill(dst *[]byte, p []byte) (pRemain []byte) {
+ if remain := w.N - len(*dst); remain > 0 {
+ add := minInt(len(p), remain)
+ *dst = append(*dst, p[:add]...)
+ p = p[add:]
+ }
+ return p
+}
+
+func (w *prefixSuffixSaver) Bytes() []byte {
+ if w.suffix == nil {
+ return w.prefix
+ }
+ if w.skipped == 0 {
+ return append(w.prefix, w.suffix...)
+ }
+ var buf bytes.Buffer
+ buf.Grow(len(w.prefix) + len(w.suffix) + 50)
+ buf.Write(w.prefix)
+ buf.WriteString("\n... omitting ")
+ buf.WriteString(strconv.FormatInt(w.skipped, 10))
+ buf.WriteString(" bytes ...\n")
+ buf.Write(w.suffix[w.suffixOff:])
+ buf.Write(w.suffix[:w.suffixOff])
+ return buf.Bytes()
+}
+
+func minInt(a, b int) int {
+ if a < b {
+ return a
+ }
+ return b
+}
+
+// dedupEnv returns a copy of env with any duplicates removed, in favor of
+// later values.
+// Items not of the normal environment "key=value" form are preserved unchanged.
+func dedupEnv(env []string) []string {
+ return dedupEnvCase(runtime.GOOS == "windows", env)
+}
+
+// dedupEnvCase is dedupEnv with a case option for testing.
+// If caseInsensitive is true, the case of keys is ignored.
+func dedupEnvCase(caseInsensitive bool, env []string) []string {
+ out := make([]string, 0, len(env))
+ saw := make(map[string]int, len(env)) // key => index into out
+ for _, kv := range env {
+ eq := strings.Index(kv, "=")
+ if eq < 0 {
+ out = append(out, kv)
+ continue
+ }
+ k := kv[:eq]
+ if caseInsensitive {
+ k = strings.ToLower(k)
+ }
+ if dupIdx, isDup := saw[k]; isDup {
+ out[dupIdx] = kv
+ continue
+ }
+ saw[k] = len(out)
+ out = append(out, kv)
+ }
+ return out
+}
+
+// addCriticalEnv adds any critical environment variables that are required
+// (or at least almost always required) on the operating system.
+// Currently this is only used for Windows.
+func addCriticalEnv(env []string) []string {
+ if runtime.GOOS != "windows" {
+ return env
+ }
+ for _, kv := range env {
+ eq := strings.Index(kv, "=")
+ if eq < 0 {
+ continue
+ }
+ k := kv[:eq]
+ if strings.EqualFold(k, "SYSTEMROOT") {
+ // We already have it.
+ return env
+ }
+ }
+ return append(env, "SYSTEMROOT="+os.Getenv("SYSTEMROOT"))
+}
diff --git a/src/os/exec/exec_linux_test.go b/src/os/exec/exec_linux_test.go
new file mode 100644
index 0000000..6f85020
--- /dev/null
+++ b/src/os/exec/exec_linux_test.go
@@ -0,0 +1,45 @@
+// Copyright 2020 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.
+
+// +build linux,cgo
+
+// On systems that use glibc, calling malloc can create a new arena,
+// and creating a new arena can read /sys/devices/system/cpu/online.
+// If we are using cgo, we will call malloc when creating a new thread.
+// That can break TestExtraFiles if we create a new thread that creates
+// a new arena and opens the /sys file while we are checking for open
+// file descriptors. Work around the problem by creating threads up front.
+// See issue 25628.
+
+package exec_test
+
+import (
+ "os"
+ "sync"
+ "syscall"
+ "time"
+)
+
+func init() {
+ if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
+ return
+ }
+
+ // Start some threads. 10 is arbitrary but intended to be enough
+ // to ensure that the code won't have to create any threads itself.
+ // In particular this should be more than the number of threads
+ // the garbage collector might create.
+ const threads = 10
+
+ var wg sync.WaitGroup
+ wg.Add(threads)
+ ts := syscall.NsecToTimespec((100 * time.Microsecond).Nanoseconds())
+ for i := 0; i < threads; i++ {
+ go func() {
+ defer wg.Done()
+ syscall.Nanosleep(&ts, nil)
+ }()
+ }
+ wg.Wait()
+}
diff --git a/src/os/exec/exec_plan9.go b/src/os/exec/exec_plan9.go
new file mode 100644
index 0000000..21ac7b7
--- /dev/null
+++ b/src/os/exec/exec_plan9.go
@@ -0,0 +1,19 @@
+// Copyright 2019 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 "io/fs"
+
+func init() {
+ skipStdinCopyError = func(err error) bool {
+ // Ignore hungup errors copying to stdin if the program
+ // completed successfully otherwise.
+ // See Issue 35753.
+ pe, ok := err.(*fs.PathError)
+ return ok &&
+ pe.Op == "write" && pe.Path == "|1" &&
+ pe.Err.Error() == "i/o on hungup channel"
+ }
+}
diff --git a/src/os/exec/exec_posix_test.go b/src/os/exec/exec_posix_test.go
new file mode 100644
index 0000000..d4d67ac
--- /dev/null
+++ b/src/os/exec/exec_posix_test.go
@@ -0,0 +1,88 @@
+// Copyright 2017 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.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package exec_test
+
+import (
+ "os/user"
+ "runtime"
+ "strconv"
+ "syscall"
+ "testing"
+ "time"
+)
+
+func TestCredentialNoSetGroups(t *testing.T) {
+ if runtime.GOOS == "android" {
+ t.Skip("unsupported on Android")
+ }
+
+ u, err := user.Current()
+ if err != nil {
+ t.Fatalf("error getting current user: %v", err)
+ }
+
+ uid, err := strconv.Atoi(u.Uid)
+ if err != nil {
+ t.Fatalf("error converting Uid=%s to integer: %v", u.Uid, err)
+ }
+
+ gid, err := strconv.Atoi(u.Gid)
+ if err != nil {
+ t.Fatalf("error converting Gid=%s to integer: %v", u.Gid, err)
+ }
+
+ // If NoSetGroups is true, setgroups isn't called and cmd.Run should succeed
+ cmd := helperCommand(t, "echo", "foo")
+ cmd.SysProcAttr = &syscall.SysProcAttr{
+ Credential: &syscall.Credential{
+ Uid: uint32(uid),
+ Gid: uint32(gid),
+ NoSetGroups: true,
+ },
+ }
+
+ if err = cmd.Run(); err != nil {
+ t.Errorf("Failed to run command: %v", err)
+ }
+}
+
+// For issue #19314: make sure that SIGSTOP does not cause the process
+// to appear done.
+func TestWaitid(t *testing.T) {
+ t.Parallel()
+
+ cmd := helperCommand(t, "sleep")
+ if err := cmd.Start(); err != nil {
+ t.Fatal(err)
+ }
+
+ // The sleeps here are unnecessary in the sense that the test
+ // should still pass, but they are useful to make it more
+ // likely that we are testing the expected state of the child.
+ time.Sleep(100 * time.Millisecond)
+
+ if err := cmd.Process.Signal(syscall.SIGSTOP); err != nil {
+ cmd.Process.Kill()
+ t.Fatal(err)
+ }
+
+ ch := make(chan error)
+ go func() {
+ ch <- cmd.Wait()
+ }()
+
+ time.Sleep(100 * time.Millisecond)
+
+ if err := cmd.Process.Signal(syscall.SIGCONT); err != nil {
+ t.Error(err)
+ syscall.Kill(cmd.Process.Pid, syscall.SIGCONT)
+ }
+
+ cmd.Process.Kill()
+
+ <-ch
+}
diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
new file mode 100644
index 0000000..8b0c93f
--- /dev/null
+++ b/src/os/exec/exec_test.go
@@ -0,0 +1,1176 @@
+// 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.
+
+// Use an external test to avoid os/exec -> net/http -> crypto/x509 -> os/exec
+// circular dependency on non-cgo darwin.
+
+package exec_test
+
+import (
+ "bufio"
+ "bytes"
+ "context"
+ "fmt"
+ "internal/poll"
+ "internal/testenv"
+ "io"
+ "log"
+ "net"
+ "net/http"
+ "net/http/httptest"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "runtime"
+ "strconv"
+ "strings"
+ "testing"
+ "time"
+)
+
+// haveUnexpectedFDs is set at init time to report whether any
+// file descriptors were open at program start.
+var haveUnexpectedFDs bool
+
+// unfinalizedFiles holds files that should not be finalized,
+// because that would close the associated file descriptor,
+// which we don't want to do.
+var unfinalizedFiles []*os.File
+
+func init() {
+ if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
+ return
+ }
+ if runtime.GOOS == "windows" {
+ return
+ }
+ for fd := uintptr(3); fd <= 100; fd++ {
+ if poll.IsPollDescriptor(fd) {
+ continue
+ }
+ // We have no good portable way to check whether an FD is open.
+ // We use NewFile to create a *os.File, which lets us
+ // know whether it is open, but then we have to cope with
+ // the finalizer on the *os.File.
+ f := os.NewFile(fd, "")
+ if _, err := f.Stat(); err != nil {
+ // Close the file to clear the finalizer.
+ // We expect the Close to fail.
+ f.Close()
+ } else {
+ fmt.Printf("fd %d open at test start\n", fd)
+ haveUnexpectedFDs = true
+ // Use a global variable to avoid running
+ // the finalizer, which would close the FD.
+ unfinalizedFiles = append(unfinalizedFiles, f)
+ }
+ }
+}
+
+func helperCommandContext(t *testing.T, ctx context.Context, s ...string) (cmd *exec.Cmd) {
+ testenv.MustHaveExec(t)
+
+ cs := []string{"-test.run=TestHelperProcess", "--"}
+ cs = append(cs, s...)
+ if ctx != nil {
+ cmd = exec.CommandContext(ctx, os.Args[0], cs...)
+ } else {
+ cmd = exec.Command(os.Args[0], cs...)
+ }
+ cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
+ return cmd
+}
+
+func helperCommand(t *testing.T, s ...string) *exec.Cmd {
+ return helperCommandContext(t, nil, s...)
+}
+
+func TestEcho(t *testing.T) {
+ bs, err := helperCommand(t, "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 TestCommandRelativeName(t *testing.T) {
+ testenv.MustHaveExec(t)
+
+ // Run our own binary as a relative path
+ // (e.g. "_test/exec.test") our parent directory.
+ base := filepath.Base(os.Args[0]) // "exec.test"
+ dir := filepath.Dir(os.Args[0]) // "/tmp/go-buildNNNN/os/exec/_test"
+ if dir == "." {
+ t.Skip("skipping; running test at root somehow")
+ }
+ parentDir := filepath.Dir(dir) // "/tmp/go-buildNNNN/os/exec"
+ dirBase := filepath.Base(dir) // "_test"
+ if dirBase == "." {
+ t.Skipf("skipping; unexpected shallow dir of %q", dir)
+ }
+
+ cmd := exec.Command(filepath.Join(dirBase, base), "-test.run=TestHelperProcess", "--", "echo", "foo")
+ cmd.Dir = parentDir
+ cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1"}
+
+ out, err := cmd.Output()
+ if err != nil {
+ t.Errorf("echo: %v", err)
+ }
+ if g, e := string(out), "foo\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(t, "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 TestEchoFileRace(t *testing.T) {
+ cmd := helperCommand(t, "echo")
+ stdin, err := cmd.StdinPipe()
+ if err != nil {
+ t.Fatalf("StdinPipe: %v", err)
+ }
+ if err := cmd.Start(); err != nil {
+ t.Fatalf("Start: %v", err)
+ }
+ wrote := make(chan bool)
+ go func() {
+ defer close(wrote)
+ fmt.Fprint(stdin, "echo\n")
+ }()
+ if err := cmd.Wait(); err != nil {
+ t.Fatalf("Wait: %v", err)
+ }
+ <-wrote
+}
+
+func TestCatGoodAndBadFile(t *testing.T) {
+ // Testing combined output and error values.
+ bs, err := helperCommand(t, "cat", "/bogus/file.foo", "exec_test.go").CombinedOutput()
+ if _, ok := err.(*exec.ExitError); !ok {
+ t.Errorf("expected *exec.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 TestNoExistExecutable(t *testing.T) {
+ // Can't run a non-existent executable
+ err := exec.Command("/no-exist-executable").Run()
+ if err == nil {
+ t.Error("expected error from /no-exist-executable")
+ }
+}
+
+func TestExitStatus(t *testing.T) {
+ // Test that exit values are returned correctly
+ cmd := helperCommand(t, "exit", "42")
+ err := cmd.Run()
+ want := "exit status 42"
+ switch runtime.GOOS {
+ case "plan9":
+ want = fmt.Sprintf("exit status: '%s %d: 42'", filepath.Base(cmd.Path), cmd.ProcessState.Pid())
+ }
+ if werr, ok := err.(*exec.ExitError); ok {
+ if s := werr.Error(); s != want {
+ t.Errorf("from exit 42 got exit %q, want %q", s, want)
+ }
+ } else {
+ t.Fatalf("expected *exec.ExitError from exit 42; got %T: %v", err, err)
+ }
+}
+
+func TestExitCode(t *testing.T) {
+ // Test that exit code are returned correctly
+ cmd := helperCommand(t, "exit", "42")
+ cmd.Run()
+ want := 42
+ if runtime.GOOS == "plan9" {
+ want = 1
+ }
+ got := cmd.ProcessState.ExitCode()
+ if want != got {
+ t.Errorf("ExitCode got %d, want %d", got, want)
+ }
+
+ cmd = helperCommand(t, "/no-exist-executable")
+ cmd.Run()
+ want = 2
+ if runtime.GOOS == "plan9" {
+ want = 1
+ }
+ got = cmd.ProcessState.ExitCode()
+ if want != got {
+ t.Errorf("ExitCode got %d, want %d", got, want)
+ }
+
+ cmd = helperCommand(t, "exit", "255")
+ cmd.Run()
+ want = 255
+ if runtime.GOOS == "plan9" {
+ want = 1
+ }
+ got = cmd.ProcessState.ExitCode()
+ if want != got {
+ t.Errorf("ExitCode got %d, want %d", got, want)
+ }
+
+ cmd = helperCommand(t, "cat")
+ cmd.Run()
+ want = 0
+ got = cmd.ProcessState.ExitCode()
+ if want != got {
+ t.Errorf("ExitCode got %d, want %d", got, want)
+ }
+
+ // Test when command does not call Run().
+ cmd = helperCommand(t, "cat")
+ want = -1
+ got = cmd.ProcessState.ExitCode()
+ if want != got {
+ t.Errorf("ExitCode got %d, want %d", got, want)
+ }
+}
+
+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(t, "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)
+}
+
+const stdinCloseTestString = "Some test string."
+
+// Issue 6270.
+func TestStdinClose(t *testing.T) {
+ check := func(what string, err error) {
+ if err != nil {
+ t.Fatalf("%s: %v", what, err)
+ }
+ }
+ cmd := helperCommand(t, "stdinClose")
+ stdin, err := cmd.StdinPipe()
+ check("StdinPipe", err)
+ // Check that we can access methods of the underlying os.File.`
+ if _, ok := stdin.(interface {
+ Fd() uintptr
+ }); !ok {
+ t.Error("can't access methods of underlying *os.File")
+ }
+ check("Start", cmd.Start())
+ go func() {
+ _, err := io.Copy(stdin, strings.NewReader(stdinCloseTestString))
+ check("Copy", err)
+ // Before the fix, this next line would race with cmd.Wait.
+ check("Close", stdin.Close())
+ }()
+ check("Wait", cmd.Wait())
+}
+
+// Issue 17647.
+// It used to be the case that TestStdinClose, above, would fail when
+// run under the race detector. This test is a variant of TestStdinClose
+// that also used to fail when run under the race detector.
+// This test is run by cmd/dist under the race detector to verify that
+// the race detector no longer reports any problems.
+func TestStdinCloseRace(t *testing.T) {
+ cmd := helperCommand(t, "stdinClose")
+ stdin, err := cmd.StdinPipe()
+ if err != nil {
+ t.Fatalf("StdinPipe: %v", err)
+ }
+ if err := cmd.Start(); err != nil {
+ t.Fatalf("Start: %v", err)
+ }
+ go func() {
+ // We don't check the error return of Kill. It is
+ // possible that the process has already exited, in
+ // which case Kill will return an error "process
+ // already finished". The purpose of this test is to
+ // see whether the race detector reports an error; it
+ // doesn't matter whether this Kill succeeds or not.
+ cmd.Process.Kill()
+ }()
+ go func() {
+ // Send the wrong string, so that the child fails even
+ // if the other goroutine doesn't manage to kill it first.
+ // This test is to check that the race detector does not
+ // falsely report an error, so it doesn't matter how the
+ // child process fails.
+ io.Copy(stdin, strings.NewReader("unexpected string"))
+ if err := stdin.Close(); err != nil {
+ t.Errorf("stdin.Close: %v", err)
+ }
+ }()
+ if err := cmd.Wait(); err == nil {
+ t.Fatalf("Wait: succeeded unexpectedly")
+ }
+}
+
+// Issue 5071
+func TestPipeLookPathLeak(t *testing.T) {
+ // If we are reading from /proc/self/fd we (should) get an exact result.
+ tolerance := 0
+
+ // Reading /proc/self/fd is more reliable than calling lsof, so try that
+ // first.
+ numOpenFDs := func() (int, []byte, error) {
+ fds, err := os.ReadDir("/proc/self/fd")
+ if err != nil {
+ return 0, nil, err
+ }
+ return len(fds), nil, nil
+ }
+ want, before, err := numOpenFDs()
+ if err != nil {
+ // We encountered a problem reading /proc/self/fd (we might be on
+ // a platform that doesn't have it). Fall back onto lsof.
+ t.Logf("using lsof because: %v", err)
+ numOpenFDs = func() (int, []byte, error) {
+ // Android's stock lsof does not obey the -p option,
+ // so extra filtering is needed.
+ // https://golang.org/issue/10206
+ if runtime.GOOS == "android" {
+ // numOpenFDsAndroid handles errors itself and
+ // might skip or fail the test.
+ n, lsof := numOpenFDsAndroid(t)
+ return n, lsof, nil
+ }
+ lsof, err := exec.Command("lsof", "-b", "-n", "-p", strconv.Itoa(os.Getpid())).Output()
+ return bytes.Count(lsof, []byte("\n")), lsof, err
+ }
+
+ // lsof may see file descriptors associated with the fork itself,
+ // so we allow some extra margin if we have to use it.
+ // https://golang.org/issue/19243
+ tolerance = 5
+
+ // Retry reading the number of open file descriptors.
+ want, before, err = numOpenFDs()
+ if err != nil {
+ t.Log(err)
+ t.Skipf("skipping test; error finding or running lsof")
+ }
+ }
+
+ for i := 0; i < 6; i++ {
+ cmd := exec.Command("something-that-does-not-exist-executable")
+ cmd.StdoutPipe()
+ cmd.StderrPipe()
+ cmd.StdinPipe()
+ if err := cmd.Run(); err == nil {
+ t.Fatal("unexpected success")
+ }
+ }
+ got, after, err := numOpenFDs()
+ if err != nil {
+ // numOpenFDs has already succeeded once, it should work here.
+ t.Errorf("unexpected failure: %v", err)
+ }
+ if got-want > tolerance {
+ t.Errorf("number of open file descriptors changed: got %v, want %v", got, want)
+ if before != nil {
+ t.Errorf("before:\n%v\n", before)
+ }
+ if after != nil {
+ t.Errorf("after:\n%v\n", after)
+ }
+ }
+}
+
+func numOpenFDsAndroid(t *testing.T) (n int, lsof []byte) {
+ raw, err := exec.Command("lsof").Output()
+ if err != nil {
+ t.Skip("skipping test; error finding or running lsof")
+ }
+
+ // First find the PID column index by parsing the first line, and
+ // select lines containing pid in the column.
+ pid := []byte(strconv.Itoa(os.Getpid()))
+ pidCol := -1
+
+ s := bufio.NewScanner(bytes.NewReader(raw))
+ for s.Scan() {
+ line := s.Bytes()
+ fields := bytes.Fields(line)
+ if pidCol < 0 {
+ for i, v := range fields {
+ if bytes.Equal(v, []byte("PID")) {
+ pidCol = i
+ break
+ }
+ }
+ lsof = append(lsof, line...)
+ continue
+ }
+ if bytes.Equal(fields[pidCol], pid) {
+ lsof = append(lsof, '\n')
+ lsof = append(lsof, line...)
+ }
+ }
+ if pidCol < 0 {
+ t.Fatal("error processing lsof output: unexpected header format")
+ }
+ if err := s.Err(); err != nil {
+ t.Fatalf("error processing lsof output: %v", err)
+ }
+ return bytes.Count(lsof, []byte("\n")), lsof
+}
+
+func TestExtraFilesFDShuffle(t *testing.T) {
+ t.Skip("flaky test; see https://golang.org/issue/5780")
+ switch runtime.GOOS {
+ case "windows":
+ t.Skip("no operating system support; skipping")
+ }
+
+ // syscall.StartProcess maps all the FDs passed to it in
+ // ProcAttr.Files (the concatenation of stdin,stdout,stderr and
+ // ExtraFiles) into consecutive FDs in the child, that is:
+ // Files{11, 12, 6, 7, 9, 3} should result in the file
+ // represented by FD 11 in the parent being made available as 0
+ // in the child, 12 as 1, etc.
+ //
+ // We want to test that FDs in the child do not get overwritten
+ // by one another as this shuffle occurs. The original implementation
+ // was buggy in that in some data dependent cases it would overwrite
+ // stderr in the child with one of the ExtraFile members.
+ // Testing for this case is difficult because it relies on using
+ // the same FD values as that case. In particular, an FD of 3
+ // must be at an index of 4 or higher in ProcAttr.Files and
+ // the FD of the write end of the Stderr pipe (as obtained by
+ // StderrPipe()) must be the same as the size of ProcAttr.Files;
+ // therefore we test that the read end of this pipe (which is what
+ // is returned to the parent by StderrPipe() being one less than
+ // the size of ProcAttr.Files, i.e. 3+len(cmd.ExtraFiles).
+ //
+ // Moving this test case around within the overall tests may
+ // affect the FDs obtained and hence the checks to catch these cases.
+ npipes := 2
+ c := helperCommand(t, "extraFilesAndPipes", strconv.Itoa(npipes+1))
+ rd, wr, _ := os.Pipe()
+ defer rd.Close()
+ if rd.Fd() != 3 {
+ t.Errorf("bad test value for test pipe: fd %d", rd.Fd())
+ }
+ stderr, _ := c.StderrPipe()
+ wr.WriteString("_LAST")
+ wr.Close()
+
+ pipes := make([]struct {
+ r, w *os.File
+ }, npipes)
+ data := []string{"a", "b"}
+
+ for i := 0; i < npipes; i++ {
+ r, w, err := os.Pipe()
+ if err != nil {
+ t.Fatalf("unexpected error creating pipe: %s", err)
+ }
+ pipes[i].r = r
+ pipes[i].w = w
+ w.WriteString(data[i])
+ c.ExtraFiles = append(c.ExtraFiles, pipes[i].r)
+ defer func() {
+ r.Close()
+ w.Close()
+ }()
+ }
+ // Put fd 3 at the end.
+ c.ExtraFiles = append(c.ExtraFiles, rd)
+
+ stderrFd := int(stderr.(*os.File).Fd())
+ if stderrFd != ((len(c.ExtraFiles) + 3) - 1) {
+ t.Errorf("bad test value for stderr pipe")
+ }
+
+ expected := "child: " + strings.Join(data, "") + "_LAST"
+
+ err := c.Start()
+ if err != nil {
+ t.Fatalf("Run: %v", err)
+ }
+ ch := make(chan string, 1)
+ go func(ch chan string) {
+ buf := make([]byte, 512)
+ n, err := stderr.Read(buf)
+ if err != nil {
+ t.Errorf("Read: %s", err)
+ ch <- err.Error()
+ } else {
+ ch <- string(buf[:n])
+ }
+ close(ch)
+ }(ch)
+ select {
+ case m := <-ch:
+ if m != expected {
+ t.Errorf("Read: '%s' not '%s'", m, expected)
+ }
+ case <-time.After(5 * time.Second):
+ t.Errorf("Read timedout")
+ }
+ c.Wait()
+}
+
+func TestExtraFiles(t *testing.T) {
+ if haveUnexpectedFDs {
+ // The point of this test is to make sure that any
+ // descriptors we open are marked close-on-exec.
+ // If haveUnexpectedFDs is true then there were other
+ // descriptors open when we started the test,
+ // so those descriptors are clearly not close-on-exec,
+ // and they will confuse the test. We could modify
+ // the test to expect those descriptors to remain open,
+ // but since we don't know where they came from or what
+ // they are doing, that seems fragile. For example,
+ // perhaps they are from the startup code on this
+ // system for some reason. Also, this test is not
+ // system-specific; as long as most systems do not skip
+ // the test, we will still be testing what we care about.
+ t.Skip("skipping test because test was run with FDs open")
+ }
+
+ testenv.MustHaveExec(t)
+ testenv.MustHaveGoBuild(t)
+
+ // This test runs with cgo disabled. External linking needs cgo, so
+ // it doesn't work if external linking is required.
+ testenv.MustInternalLink(t)
+
+ if runtime.GOOS == "windows" {
+ t.Skipf("skipping test on %q", runtime.GOOS)
+ }
+
+ // 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.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+ // quiet expected TLS handshake error "remote error: bad certificate"
+ ts.Config.ErrorLog = log.New(io.Discard, "", 0)
+ ts.StartTLS()
+ defer ts.Close()
+ _, err = http.Get(ts.URL)
+ if err == nil {
+ t.Errorf("success trying to fetch %s; want an error", ts.URL)
+ }
+
+ tf, err := os.CreateTemp("", "")
+ 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, io.SeekStart)
+ if err != nil {
+ t.Fatalf("Seek: %v", err)
+ }
+
+ tempdir := t.TempDir()
+ exe := filepath.Join(tempdir, "read3.exe")
+
+ c := exec.Command(testenv.GoToolPath(t), "build", "-o", exe, "read3.go")
+ // Build the test without cgo, so that C library functions don't
+ // open descriptors unexpectedly. See issue 25628.
+ c.Env = append(os.Environ(), "CGO_ENABLED=0")
+ if output, err := c.CombinedOutput(); err != nil {
+ t.Logf("go build -o %s read3.go\n%s", exe, output)
+ t.Fatalf("go build failed: %v", err)
+ }
+
+ // Use a deadline to try to get some output even if the program hangs.
+ ctx := context.Background()
+ if deadline, ok := t.Deadline(); ok {
+ // Leave a 20% grace period to flush output, which may be large on the
+ // linux/386 builders because we're running the subprocess under strace.
+ deadline = deadline.Add(-time.Until(deadline) / 5)
+
+ var cancel context.CancelFunc
+ ctx, cancel = context.WithDeadline(ctx, deadline)
+ defer cancel()
+ }
+
+ c = exec.CommandContext(ctx, exe)
+ var stdout, stderr bytes.Buffer
+ c.Stdout = &stdout
+ c.Stderr = &stderr
+ c.ExtraFiles = []*os.File{tf}
+ if runtime.GOOS == "illumos" {
+ // Some facilities in illumos are implemented via access
+ // to /proc by libc; such accesses can briefly occupy a
+ // low-numbered fd. If this occurs concurrently with the
+ // test that checks for leaked descriptors, the check can
+ // become confused and report a spurious leaked descriptor.
+ // (See issue #42431 for more detailed analysis.)
+ //
+ // Attempt to constrain the use of additional threads in the
+ // child process to make this test less flaky:
+ c.Env = append(os.Environ(), "GOMAXPROCS=1")
+ }
+ err = c.Run()
+ if err != nil {
+ t.Fatalf("Run: %v\n--- stdout:\n%s--- stderr:\n%s", err, stdout.Bytes(), stderr.Bytes())
+ }
+ if stdout.String() != text {
+ t.Errorf("got stdout %q, stderr %q; want %q on stdout", stdout.String(), stderr.String(), 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 *exec.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++ {
+ if testing.Short() && i >= 3 {
+ break
+ }
+ la := listen()
+ ca := helperCommand(t, "describefiles")
+ ca.ExtraFiles = []*os.File{listenerFile(la)}
+ lb := listen()
+ cb := helperCommand(t, "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()
+ for _, f := range ca.ExtraFiles {
+ f.Close()
+ }
+ for _, f := range cb.ExtraFiles {
+ f.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)
+
+ 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 "echoenv":
+ for _, s := range args {
+ fmt.Println(os.Getenv(s))
+ }
+ os.Exit(0)
+ 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 "stdinClose":
+ b, err := io.ReadAll(os.Stdin)
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+ os.Exit(1)
+ }
+ if s := string(b); s != stdinCloseTestString {
+ fmt.Fprintf(os.Stderr, "Error: Read %q, want %q", s, stdinCloseTestString)
+ os.Exit(1)
+ }
+ os.Exit(0)
+ case "exit":
+ n, _ := strconv.Atoi(args[0])
+ os.Exit(n)
+ case "describefiles":
+ f := os.NewFile(3, fmt.Sprintf("fd3"))
+ ln, err := net.FileListener(f)
+ if err == nil {
+ fmt.Printf("fd3: listener %s\n", ln.Addr())
+ ln.Close()
+ }
+ os.Exit(0)
+ case "extraFilesAndPipes":
+ n, _ := strconv.Atoi(args[0])
+ pipes := make([]*os.File, n)
+ for i := 0; i < n; i++ {
+ pipes[i] = os.NewFile(uintptr(3+i), strconv.Itoa(i))
+ }
+ response := ""
+ for i, r := range pipes {
+ ch := make(chan string, 1)
+ go func(c chan string) {
+ buf := make([]byte, 10)
+ n, err := r.Read(buf)
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "Child: read error: %v on pipe %d\n", err, i)
+ os.Exit(1)
+ }
+ c <- string(buf[:n])
+ close(c)
+ }(ch)
+ select {
+ case m := <-ch:
+ response = response + m
+ case <-time.After(5 * time.Second):
+ fmt.Fprintf(os.Stderr, "Child: Timeout reading from pipe: %d\n", i)
+ os.Exit(1)
+ }
+ }
+ fmt.Fprintf(os.Stderr, "child: %s", response)
+ os.Exit(0)
+ case "exec":
+ cmd := exec.Command(args[1])
+ cmd.Dir = args[0]
+ output, err := cmd.CombinedOutput()
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "Child: %s %s", err, string(output))
+ os.Exit(1)
+ }
+ fmt.Printf("%s", string(output))
+ os.Exit(0)
+ case "lookpath":
+ p, err := exec.LookPath(args[0])
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "LookPath failed: %v\n", err)
+ os.Exit(1)
+ }
+ fmt.Print(p)
+ os.Exit(0)
+ case "stderrfail":
+ fmt.Fprintf(os.Stderr, "some stderr text\n")
+ os.Exit(1)
+ case "sleep":
+ time.Sleep(3 * time.Second)
+ os.Exit(0)
+ default:
+ fmt.Fprintf(os.Stderr, "Unknown command %q\n", cmd)
+ os.Exit(2)
+ }
+}
+
+type delayedInfiniteReader struct{}
+
+func (delayedInfiniteReader) Read(b []byte) (int, error) {
+ time.Sleep(100 * time.Millisecond)
+ for i := range b {
+ b[i] = 'x'
+ }
+ return len(b), nil
+}
+
+// Issue 9173: ignore stdin pipe writes if the program completes successfully.
+func TestIgnorePipeErrorOnSuccess(t *testing.T) {
+ testenv.MustHaveExec(t)
+
+ testWith := func(r io.Reader) func(*testing.T) {
+ return func(t *testing.T) {
+ cmd := helperCommand(t, "echo", "foo")
+ var out bytes.Buffer
+ cmd.Stdin = r
+ cmd.Stdout = &out
+ if err := cmd.Run(); err != nil {
+ t.Fatal(err)
+ }
+ if got, want := out.String(), "foo\n"; got != want {
+ t.Errorf("output = %q; want %q", got, want)
+ }
+ }
+ }
+ t.Run("10MB", testWith(strings.NewReader(strings.Repeat("x", 10<<20))))
+ t.Run("Infinite", testWith(delayedInfiniteReader{}))
+}
+
+type badWriter struct{}
+
+func (w *badWriter) Write(data []byte) (int, error) {
+ return 0, io.ErrUnexpectedEOF
+}
+
+func TestClosePipeOnCopyError(t *testing.T) {
+ testenv.MustHaveExec(t)
+
+ if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
+ t.Skipf("skipping test on %s - no yes command", runtime.GOOS)
+ }
+ cmd := exec.Command("yes")
+ cmd.Stdout = new(badWriter)
+ c := make(chan int, 1)
+ go func() {
+ err := cmd.Run()
+ if err == nil {
+ t.Errorf("yes completed successfully")
+ }
+ c <- 1
+ }()
+ select {
+ case <-c:
+ // ok
+ case <-time.After(5 * time.Second):
+ t.Fatalf("yes got stuck writing to bad writer")
+ }
+}
+
+func TestOutputStderrCapture(t *testing.T) {
+ testenv.MustHaveExec(t)
+
+ cmd := helperCommand(t, "stderrfail")
+ _, err := cmd.Output()
+ ee, ok := err.(*exec.ExitError)
+ if !ok {
+ t.Fatalf("Output error type = %T; want ExitError", err)
+ }
+ got := string(ee.Stderr)
+ want := "some stderr text\n"
+ if got != want {
+ t.Errorf("ExitError.Stderr = %q; want %q", got, want)
+ }
+}
+
+func TestContext(t *testing.T) {
+ ctx, cancel := context.WithCancel(context.Background())
+ c := helperCommandContext(t, ctx, "pipetest")
+ stdin, err := c.StdinPipe()
+ if err != nil {
+ t.Fatal(err)
+ }
+ stdout, err := c.StdoutPipe()
+ if err != nil {
+ t.Fatal(err)
+ }
+ if err := c.Start(); err != nil {
+ t.Fatal(err)
+ }
+
+ if _, err := stdin.Write([]byte("O:hi\n")); err != nil {
+ t.Fatal(err)
+ }
+ buf := make([]byte, 5)
+ n, err := io.ReadFull(stdout, buf)
+ if n != len(buf) || err != nil || string(buf) != "O:hi\n" {
+ t.Fatalf("ReadFull = %d, %v, %q", n, err, buf[:n])
+ }
+ waitErr := make(chan error, 1)
+ go func() {
+ waitErr <- c.Wait()
+ }()
+ cancel()
+ select {
+ case err := <-waitErr:
+ if err == nil {
+ t.Fatal("expected Wait failure")
+ }
+ case <-time.After(3 * time.Second):
+ t.Fatal("timeout waiting for child process death")
+ }
+}
+
+func TestContextCancel(t *testing.T) {
+ ctx, cancel := context.WithCancel(context.Background())
+ defer cancel()
+ c := helperCommandContext(t, ctx, "cat")
+
+ r, w, err := os.Pipe()
+ if err != nil {
+ t.Fatal(err)
+ }
+ c.Stdin = r
+
+ stdout, err := c.StdoutPipe()
+ if err != nil {
+ t.Fatal(err)
+ }
+ readDone := make(chan struct{})
+ go func() {
+ defer close(readDone)
+ var a [1024]byte
+ for {
+ n, err := stdout.Read(a[:])
+ if err != nil {
+ if err != io.EOF {
+ t.Errorf("unexpected read error: %v", err)
+ }
+ return
+ }
+ t.Logf("%s", a[:n])
+ }
+ }()
+
+ if err := c.Start(); err != nil {
+ t.Fatal(err)
+ }
+
+ if err := r.Close(); err != nil {
+ t.Fatal(err)
+ }
+
+ if _, err := io.WriteString(w, "echo"); err != nil {
+ t.Fatal(err)
+ }
+
+ cancel()
+
+ // Calling cancel should have killed the process, so writes
+ // should now fail. Give the process a little while to die.
+ start := time.Now()
+ for {
+ if _, err := io.WriteString(w, "echo"); err != nil {
+ break
+ }
+ if time.Since(start) > time.Second {
+ t.Fatal("canceling context did not stop program")
+ }
+ time.Sleep(time.Millisecond)
+ }
+
+ if err := w.Close(); err != nil {
+ t.Errorf("error closing write end of pipe: %v", err)
+ }
+ <-readDone
+
+ if err := c.Wait(); err == nil {
+ t.Error("program unexpectedly exited successfully")
+ } else {
+ t.Logf("exit status: %v", err)
+ }
+}
+
+// test that environment variables are de-duped.
+func TestDedupEnvEcho(t *testing.T) {
+ testenv.MustHaveExec(t)
+
+ cmd := helperCommand(t, "echoenv", "FOO")
+ cmd.Env = append(cmd.Env, "FOO=bad", "FOO=good")
+ out, err := cmd.CombinedOutput()
+ if err != nil {
+ t.Fatal(err)
+ }
+ if got, want := strings.TrimSpace(string(out)), "good"; got != want {
+ t.Errorf("output = %q; want %q", got, want)
+ }
+}
+
+func TestString(t *testing.T) {
+ echoPath, err := exec.LookPath("echo")
+ if err != nil {
+ t.Skip(err)
+ }
+ tests := [...]struct {
+ path string
+ args []string
+ want string
+ }{
+ {"echo", nil, echoPath},
+ {"echo", []string{"a"}, echoPath + " a"},
+ {"echo", []string{"a", "b"}, echoPath + " a b"},
+ }
+ for _, test := range tests {
+ cmd := exec.Command(test.path, test.args...)
+ if got := cmd.String(); got != test.want {
+ t.Errorf("String(%q, %q) = %q, want %q", test.path, test.args, got, test.want)
+ }
+ }
+}
+
+func TestStringPathNotResolved(t *testing.T) {
+ _, err := exec.LookPath("makemeasandwich")
+ if err == nil {
+ t.Skip("wow, thanks")
+ }
+ cmd := exec.Command("makemeasandwich", "-lettuce")
+ want := "makemeasandwich -lettuce"
+ if got := cmd.String(); got != want {
+ t.Errorf("String(%q, %q) = %q, want %q", "makemeasandwich", "-lettuce", got, want)
+ }
+}
+
+// start a child process without the user code explicitly starting
+// with a copy of the parent's. (The Windows SYSTEMROOT issue: Issue
+// 25210)
+func TestChildCriticalEnv(t *testing.T) {
+ testenv.MustHaveExec(t)
+ if runtime.GOOS != "windows" {
+ t.Skip("only testing on Windows")
+ }
+ cmd := helperCommand(t, "echoenv", "SYSTEMROOT")
+ cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1"}
+ out, err := cmd.CombinedOutput()
+ if err != nil {
+ t.Fatal(err)
+ }
+ if strings.TrimSpace(string(out)) == "" {
+ t.Error("no SYSTEMROOT found")
+ }
+}
diff --git a/src/os/exec/exec_unix.go b/src/os/exec/exec_unix.go
new file mode 100644
index 0000000..51c5242
--- /dev/null
+++ b/src/os/exec/exec_unix.go
@@ -0,0 +1,24 @@
+// Copyright 2015 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.
+
+// +build !plan9,!windows
+
+package exec
+
+import (
+ "io/fs"
+ "syscall"
+)
+
+func init() {
+ skipStdinCopyError = func(err error) bool {
+ // Ignore EPIPE errors copying to stdin if the program
+ // completed successfully otherwise.
+ // See Issue 9173.
+ pe, ok := err.(*fs.PathError)
+ return ok &&
+ pe.Op == "write" && pe.Path == "|1" &&
+ pe.Err == syscall.EPIPE
+ }
+}
diff --git a/src/os/exec/exec_windows.go b/src/os/exec/exec_windows.go
new file mode 100644
index 0000000..bb937f8
--- /dev/null
+++ b/src/os/exec/exec_windows.go
@@ -0,0 +1,23 @@
+// Copyright 2017 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 (
+ "io/fs"
+ "syscall"
+)
+
+func init() {
+ skipStdinCopyError = func(err error) bool {
+ // Ignore ERROR_BROKEN_PIPE and ERROR_NO_DATA errors copying
+ // to stdin if the program completed successfully otherwise.
+ // See Issue 20445.
+ const _ERROR_NO_DATA = syscall.Errno(0xe8)
+ pe, ok := err.(*fs.PathError)
+ return ok &&
+ pe.Op == "write" && pe.Path == "|1" &&
+ (pe.Err == syscall.ERROR_BROKEN_PIPE || pe.Err == _ERROR_NO_DATA)
+ }
+}
diff --git a/src/os/exec/internal_test.go b/src/os/exec/internal_test.go
new file mode 100644
index 0000000..68d517f
--- /dev/null
+++ b/src/os/exec/internal_test.go
@@ -0,0 +1,61 @@
+// Copyright 2015 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 (
+ "io"
+ "testing"
+)
+
+func TestPrefixSuffixSaver(t *testing.T) {
+ tests := []struct {
+ N int
+ writes []string
+ want string
+ }{
+ {
+ N: 2,
+ writes: nil,
+ want: "",
+ },
+ {
+ N: 2,
+ writes: []string{"a"},
+ want: "a",
+ },
+ {
+ N: 2,
+ writes: []string{"abc", "d"},
+ want: "abcd",
+ },
+ {
+ N: 2,
+ writes: []string{"abc", "d", "e"},
+ want: "ab\n... omitting 1 bytes ...\nde",
+ },
+ {
+ N: 2,
+ writes: []string{"ab______________________yz"},
+ want: "ab\n... omitting 22 bytes ...\nyz",
+ },
+ {
+ N: 2,
+ writes: []string{"ab_______________________y", "z"},
+ want: "ab\n... omitting 23 bytes ...\nyz",
+ },
+ }
+ for i, tt := range tests {
+ w := &prefixSuffixSaver{N: tt.N}
+ for _, s := range tt.writes {
+ n, err := io.WriteString(w, s)
+ if err != nil || n != len(s) {
+ t.Errorf("%d. WriteString(%q) = %v, %v; want %v, %v", i, s, n, err, len(s), nil)
+ }
+ }
+ if got := string(w.Bytes()); got != tt.want {
+ t.Errorf("%d. Bytes = %q; want %q", i, got, tt.want)
+ }
+ }
+}
diff --git a/src/os/exec/lp_js.go b/src/os/exec/lp_js.go
new file mode 100644
index 0000000..6750fb9
--- /dev/null
+++ b/src/os/exec/lp_js.go
@@ -0,0 +1,23 @@
+// Copyright 2018 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.
+
+// +build js,wasm
+
+package exec
+
+import (
+ "errors"
+)
+
+// ErrNotFound is the error resulting if a path search failed to find an executable file.
+var ErrNotFound = errors.New("executable file not found in $PATH")
+
+// LookPath searches for an executable named file in the
+// directories named by the PATH environment variable.
+// If file contains a slash, it is tried directly and the PATH is not consulted.
+// The result may be an absolute path or a path relative to the current directory.
+func LookPath(file string) (string, error) {
+ // Wasm can not execute processes, so act as if there are no executables at all.
+ return "", &Error{file, ErrNotFound}
+}
diff --git a/src/os/exec/lp_plan9.go b/src/os/exec/lp_plan9.go
new file mode 100644
index 0000000..e8826a5
--- /dev/null
+++ b/src/os/exec/lp_plan9.go
@@ -0,0 +1,56 @@
+// Copyright 2011 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 (
+ "errors"
+ "io/fs"
+ "os"
+ "path/filepath"
+ "strings"
+)
+
+// ErrNotFound is the error resulting if a path search failed to find an executable file.
+var ErrNotFound = errors.New("executable file not found in $path")
+
+func findExecutable(file string) error {
+ d, err := os.Stat(file)
+ if err != nil {
+ return err
+ }
+ if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
+ return nil
+ }
+ return fs.ErrPermission
+}
+
+// LookPath searches for an executable named file in the
+// directories named by the path environment variable.
+// If file begins with "/", "#", "./", or "../", it is tried
+// directly and the path is not consulted.
+// The result may be an absolute path or a path relative to the current directory.
+func LookPath(file string) (string, error) {
+ // skip the path lookup for these prefixes
+ skip := []string{"/", "#", "./", "../"}
+
+ for _, p := range skip {
+ if strings.HasPrefix(file, p) {
+ err := findExecutable(file)
+ if err == nil {
+ return file, nil
+ }
+ return "", &Error{file, err}
+ }
+ }
+
+ path := os.Getenv("path")
+ for _, dir := range filepath.SplitList(path) {
+ path := filepath.Join(dir, file)
+ if err := findExecutable(path); err == nil {
+ return path, nil
+ }
+ }
+ return "", &Error{file, ErrNotFound}
+}
diff --git a/src/os/exec/lp_test.go b/src/os/exec/lp_test.go
new file mode 100644
index 0000000..77d8e84
--- /dev/null
+++ b/src/os/exec/lp_test.go
@@ -0,0 +1,33 @@
+// Copyright 2011 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 (
+ "testing"
+)
+
+var nonExistentPaths = []string{
+ "some-non-existent-path",
+ "non-existent-path/slashed",
+}
+
+func TestLookPathNotFound(t *testing.T) {
+ for _, name := range nonExistentPaths {
+ path, err := LookPath(name)
+ if err == nil {
+ t.Fatalf("LookPath found %q in $PATH", name)
+ }
+ if path != "" {
+ t.Fatalf("LookPath path == %q when err != nil", path)
+ }
+ perr, ok := err.(*Error)
+ if !ok {
+ t.Fatal("LookPath error is not an exec.Error")
+ }
+ if perr.Name != name {
+ t.Fatalf("want Error name %q, got %q", name, perr.Name)
+ }
+ }
+}
diff --git a/src/os/exec/lp_unix.go b/src/os/exec/lp_unix.go
new file mode 100644
index 0000000..66c1df7
--- /dev/null
+++ b/src/os/exec/lp_unix.go
@@ -0,0 +1,59 @@
+// Copyright 2010 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.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package exec
+
+import (
+ "errors"
+ "io/fs"
+ "os"
+ "path/filepath"
+ "strings"
+)
+
+// ErrNotFound is the error resulting if a path search failed to find an executable file.
+var ErrNotFound = errors.New("executable file not found in $PATH")
+
+func findExecutable(file string) error {
+ d, err := os.Stat(file)
+ if err != nil {
+ return err
+ }
+ if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
+ return nil
+ }
+ return fs.ErrPermission
+}
+
+// LookPath searches for an executable named file in the
+// directories named by the PATH environment variable.
+// If file contains a slash, it is tried directly and the PATH is not consulted.
+// The result may be an absolute path or a path relative to the current directory.
+func LookPath(file string) (string, error) {
+ // NOTE(rsc): I wish we could use the Plan 9 behavior here
+ // (only bypass the path if file begins with / or ./ or ../)
+ // but that would not match all the Unix shells.
+
+ if strings.Contains(file, "/") {
+ err := findExecutable(file)
+ if err == nil {
+ return file, nil
+ }
+ return "", &Error{file, err}
+ }
+ path := os.Getenv("PATH")
+ for _, dir := range filepath.SplitList(path) {
+ if dir == "" {
+ // Unix shell semantics: path element "" means "."
+ dir = "."
+ }
+ path := filepath.Join(dir, file)
+ if err := findExecutable(path); err == nil {
+ return path, nil
+ }
+ }
+ return "", &Error{file, ErrNotFound}
+}
diff --git a/src/os/exec/lp_unix_test.go b/src/os/exec/lp_unix_test.go
new file mode 100644
index 0000000..296480f
--- /dev/null
+++ b/src/os/exec/lp_unix_test.go
@@ -0,0 +1,54 @@
+// Copyright 2013 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.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package exec
+
+import (
+ "os"
+ "testing"
+)
+
+func TestLookPathUnixEmptyPath(t *testing.T) {
+ tmp, err := os.MkdirTemp("", "TestLookPathUnixEmptyPath")
+ if err != nil {
+ t.Fatal("TempDir failed: ", err)
+ }
+ defer os.RemoveAll(tmp)
+ wd, err := os.Getwd()
+ if err != nil {
+ t.Fatal("Getwd failed: ", err)
+ }
+ err = os.Chdir(tmp)
+ if err != nil {
+ t.Fatal("Chdir failed: ", err)
+ }
+ defer os.Chdir(wd)
+
+ f, err := os.OpenFile("exec_me", os.O_CREATE|os.O_EXCL, 0700)
+ if err != nil {
+ t.Fatal("OpenFile failed: ", err)
+ }
+ err = f.Close()
+ if err != nil {
+ t.Fatal("Close failed: ", err)
+ }
+
+ pathenv := os.Getenv("PATH")
+ defer os.Setenv("PATH", pathenv)
+
+ err = os.Setenv("PATH", "")
+ if err != nil {
+ t.Fatal("Setenv failed: ", err)
+ }
+
+ path, err := LookPath("exec_me")
+ if err == nil {
+ t.Fatal("LookPath found exec_me in empty $PATH")
+ }
+ if path != "" {
+ t.Fatalf("LookPath path == %q when err != nil", path)
+ }
+}
diff --git a/src/os/exec/lp_windows.go b/src/os/exec/lp_windows.go
new file mode 100644
index 0000000..e7a2cdf
--- /dev/null
+++ b/src/os/exec/lp_windows.go
@@ -0,0 +1,94 @@
+// Copyright 2010 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 (
+ "errors"
+ "io/fs"
+ "os"
+ "path/filepath"
+ "strings"
+)
+
+// ErrNotFound is the error resulting if a path search failed to find an executable file.
+var ErrNotFound = errors.New("executable file not found in %PATH%")
+
+func chkStat(file string) error {
+ d, err := os.Stat(file)
+ if err != nil {
+ return err
+ }
+ if d.IsDir() {
+ return fs.ErrPermission
+ }
+ return nil
+}
+
+func hasExt(file string) bool {
+ i := strings.LastIndex(file, ".")
+ if i < 0 {
+ return false
+ }
+ return strings.LastIndexAny(file, `:\/`) < i
+}
+
+func findExecutable(file string, exts []string) (string, error) {
+ if len(exts) == 0 {
+ return file, chkStat(file)
+ }
+ if hasExt(file) {
+ if chkStat(file) == nil {
+ return file, nil
+ }
+ }
+ for _, e := range exts {
+ if f := file + e; chkStat(f) == nil {
+ return f, nil
+ }
+ }
+ return "", fs.ErrNotExist
+}
+
+// LookPath searches for an executable named file in the
+// directories named by the PATH environment variable.
+// If file contains a slash, it is tried directly and the PATH is not consulted.
+// LookPath also uses PATHEXT environment variable to match
+// a suitable candidate.
+// The result may be an absolute path or a path relative to the current directory.
+func LookPath(file string) (string, error) {
+ var exts []string
+ x := os.Getenv(`PATHEXT`)
+ if x != "" {
+ for _, e := range strings.Split(strings.ToLower(x), `;`) {
+ if e == "" {
+ continue
+ }
+ if e[0] != '.' {
+ e = "." + e
+ }
+ exts = append(exts, e)
+ }
+ } else {
+ exts = []string{".com", ".exe", ".bat", ".cmd"}
+ }
+
+ if strings.ContainsAny(file, `:\/`) {
+ if f, err := findExecutable(file, exts); err == nil {
+ return f, nil
+ } else {
+ return "", &Error{file, err}
+ }
+ }
+ if f, err := findExecutable(filepath.Join(".", file), exts); err == nil {
+ return f, nil
+ }
+ path := os.Getenv("path")
+ for _, dir := range filepath.SplitList(path) {
+ if f, err := findExecutable(filepath.Join(dir, file), exts); err == nil {
+ return f, nil
+ }
+ }
+ return "", &Error{file, ErrNotFound}
+}
diff --git a/src/os/exec/lp_windows_test.go b/src/os/exec/lp_windows_test.go
new file mode 100644
index 0000000..c6f3d5d
--- /dev/null
+++ b/src/os/exec/lp_windows_test.go
@@ -0,0 +1,577 @@
+// Copyright 2013 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.
+
+// Use an external test to avoid os/exec -> internal/testenv -> os/exec
+// circular dependency.
+
+package exec_test
+
+import (
+ "fmt"
+ "internal/testenv"
+ "io"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "strconv"
+ "strings"
+ "testing"
+)
+
+func installExe(t *testing.T, dest, src string) {
+ fsrc, err := os.Open(src)
+ if err != nil {
+ t.Fatal("os.Open failed: ", err)
+ }
+ defer fsrc.Close()
+ fdest, err := os.Create(dest)
+ if err != nil {
+ t.Fatal("os.Create failed: ", err)
+ }
+ defer fdest.Close()
+ _, err = io.Copy(fdest, fsrc)
+ if err != nil {
+ t.Fatal("io.Copy failed: ", err)
+ }
+}
+
+func installBat(t *testing.T, dest string) {
+ f, err := os.Create(dest)
+ if err != nil {
+ t.Fatalf("failed to create batch file: %v", err)
+ }
+ defer f.Close()
+ fmt.Fprintf(f, "@echo %s\n", dest)
+}
+
+func installProg(t *testing.T, dest, srcExe string) {
+ err := os.MkdirAll(filepath.Dir(dest), 0700)
+ if err != nil {
+ t.Fatal("os.MkdirAll failed: ", err)
+ }
+ if strings.ToLower(filepath.Ext(dest)) == ".bat" {
+ installBat(t, dest)
+ return
+ }
+ installExe(t, dest, srcExe)
+}
+
+type lookPathTest struct {
+ rootDir string
+ PATH string
+ PATHEXT string
+ files []string
+ searchFor string
+ fails bool // test is expected to fail
+}
+
+func (test lookPathTest) runProg(t *testing.T, env []string, args ...string) (string, error) {
+ cmd := exec.Command(args[0], args[1:]...)
+ cmd.Env = env
+ cmd.Dir = test.rootDir
+ args[0] = filepath.Base(args[0])
+ cmdText := fmt.Sprintf("%q command", strings.Join(args, " "))
+ out, err := cmd.CombinedOutput()
+ if (err != nil) != test.fails {
+ if test.fails {
+ t.Fatalf("test=%+v: %s succeeded, but expected to fail", test, cmdText)
+ }
+ t.Fatalf("test=%+v: %s failed, but expected to succeed: %v - %v", test, cmdText, err, string(out))
+ }
+ if err != nil {
+ return "", fmt.Errorf("test=%+v: %s failed: %v - %v", test, cmdText, err, string(out))
+ }
+ // normalise program output
+ p := string(out)
+ // trim terminating \r and \n that batch file outputs
+ for len(p) > 0 && (p[len(p)-1] == '\n' || p[len(p)-1] == '\r') {
+ p = p[:len(p)-1]
+ }
+ if !filepath.IsAbs(p) {
+ return p, nil
+ }
+ if p[:len(test.rootDir)] != test.rootDir {
+ t.Fatalf("test=%+v: %s output is wrong: %q must have %q prefix", test, cmdText, p, test.rootDir)
+ }
+ return p[len(test.rootDir)+1:], nil
+}
+
+func updateEnv(env []string, name, value string) []string {
+ for i, e := range env {
+ if strings.HasPrefix(strings.ToUpper(e), name+"=") {
+ env[i] = name + "=" + value
+ return env
+ }
+ }
+ return append(env, name+"="+value)
+}
+
+func createEnv(dir, PATH, PATHEXT string) []string {
+ env := os.Environ()
+ env = updateEnv(env, "PATHEXT", PATHEXT)
+ // Add dir in front of every directory in the PATH.
+ dirs := filepath.SplitList(PATH)
+ for i := range dirs {
+ dirs[i] = filepath.Join(dir, dirs[i])
+ }
+ path := strings.Join(dirs, ";")
+ env = updateEnv(env, "PATH", os.Getenv("SystemRoot")+"/System32;"+path)
+ return env
+}
+
+// createFiles copies srcPath file into multiply files.
+// It uses dir as prefix for all destination files.
+func createFiles(t *testing.T, dir string, files []string, srcPath string) {
+ for _, f := range files {
+ installProg(t, filepath.Join(dir, f), srcPath)
+ }
+}
+
+func (test lookPathTest) run(t *testing.T, tmpdir, printpathExe string) {
+ test.rootDir = tmpdir
+ createFiles(t, test.rootDir, test.files, printpathExe)
+ env := createEnv(test.rootDir, test.PATH, test.PATHEXT)
+ // Run "cmd.exe /c test.searchFor" with new environment and
+ // work directory set. All candidates are copies of printpath.exe.
+ // These will output their program paths when run.
+ should, errCmd := test.runProg(t, env, "cmd", "/c", test.searchFor)
+ // Run the lookpath program with new environment and work directory set.
+ env = append(env, "GO_WANT_HELPER_PROCESS=1")
+ have, errLP := test.runProg(t, env, os.Args[0], "-test.run=TestHelperProcess", "--", "lookpath", test.searchFor)
+ // Compare results.
+ if errCmd == nil && errLP == nil {
+ // both succeeded
+ if should != have {
+ t.Fatalf("test=%+v failed: expected to find %q, but found %q", test, should, have)
+ }
+ return
+ }
+ if errCmd != nil && errLP != nil {
+ // both failed -> continue
+ return
+ }
+ if errCmd != nil {
+ t.Fatal(errCmd)
+ }
+ if errLP != nil {
+ t.Fatal(errLP)
+ }
+}
+
+var lookPathTests = []lookPathTest{
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`, `p2\a`},
+ searchFor: `a`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1.dir;p2.dir`,
+ files: []string{`p1.dir\a`, `p2.dir\a.exe`},
+ searchFor: `a`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `a.exe`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\b.exe`},
+ searchFor: `b`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\b`, `p2\a`},
+ searchFor: `a`,
+ fails: true, // TODO(brainman): do not know why this fails
+ },
+ // If the command name specifies a path, the shell searches
+ // the specified path for an executable file matching
+ // the command name. If a match is found, the external
+ // command (the executable file) executes.
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `p2\a`,
+ },
+ // If the command name specifies a path, the shell searches
+ // the specified path for an executable file matching the command
+ // name. ... If no match is found, the shell reports an error
+ // and command processing completes.
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\b.exe`, `p2\a.exe`},
+ searchFor: `p2\b`,
+ fails: true,
+ },
+ // If the command name does not specify a path, the shell
+ // searches the current directory for an executable file
+ // matching the command name. If a match is found, the external
+ // command (the executable file) executes.
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`a`, `p1\a.exe`, `p2\a.exe`},
+ searchFor: `a`,
+ },
+ // The shell now searches each directory specified by the
+ // PATH environment variable, in the order listed, for an
+ // executable file matching the command name. If a match
+ // is found, the external command (the executable file) executes.
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `a`,
+ },
+ // The shell now searches each directory specified by the
+ // PATH environment variable, in the order listed, for an
+ // executable file matching the command name. If no match
+ // is found, the shell reports an error and command processing
+ // completes.
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `b`,
+ fails: true,
+ },
+ // If the command name includes a file extension, the shell
+ // searches each directory for the exact file name specified
+ // by the command name.
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `a.exe`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `a.com`,
+ fails: true, // includes extension and not exact file name match
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1`,
+ files: []string{`p1\a.exe.exe`},
+ searchFor: `a.exe`,
+ },
+ {
+ PATHEXT: `.COM;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.exe`, `p2\a.exe`},
+ searchFor: `a.exe`,
+ },
+ // If the command name does not include a file extension, the shell
+ // adds the extensions listed in the PATHEXT environment variable,
+ // one by one, and searches the directory for that file name. Note
+ // that the shell tries all possible file extensions in a specific
+ // directory before moving on to search the next directory
+ // (if there is one).
+ {
+ PATHEXT: `.COM;.EXE`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.bat`, `p2\a.exe`},
+ searchFor: `a`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.bat`, `p2\a.exe`},
+ searchFor: `a`,
+ },
+ {
+ PATHEXT: `.COM;.EXE;.BAT`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.bat`, `p1\a.exe`, `p2\a.bat`, `p2\a.exe`},
+ searchFor: `a`,
+ },
+ {
+ PATHEXT: `.COM`,
+ PATH: `p1;p2`,
+ files: []string{`p1\a.bat`, `p2\a.exe`},
+ searchFor: `a`,
+ fails: true, // tried all extensions in PATHEXT, but none matches
+ },
+}
+
+func TestLookPath(t *testing.T) {
+ tmp, err := os.MkdirTemp("", "TestLookPath")
+ if err != nil {
+ t.Fatal("TempDir failed: ", err)
+ }
+ defer os.RemoveAll(tmp)
+
+ printpathExe := buildPrintPathExe(t, tmp)
+
+ // Run all tests.
+ for i, test := range lookPathTests {
+ dir := filepath.Join(tmp, "d"+strconv.Itoa(i))
+ err := os.Mkdir(dir, 0700)
+ if err != nil {
+ t.Fatal("Mkdir failed: ", err)
+ }
+ test.run(t, dir, printpathExe)
+ }
+}
+
+type commandTest struct {
+ PATH string
+ files []string
+ dir string
+ arg0 string
+ want string
+ fails bool // test is expected to fail
+}
+
+func (test commandTest) isSuccess(rootDir, output string, err error) error {
+ if err != nil {
+ return fmt.Errorf("test=%+v: exec: %v %v", test, err, output)
+ }
+ path := output
+ if path[:len(rootDir)] != rootDir {
+ return fmt.Errorf("test=%+v: %q must have %q prefix", test, path, rootDir)
+ }
+ path = path[len(rootDir)+1:]
+ if path != test.want {
+ return fmt.Errorf("test=%+v: want %q, got %q", test, test.want, path)
+ }
+ return nil
+}
+
+func (test commandTest) runOne(rootDir string, env []string, dir, arg0 string) error {
+ cmd := exec.Command(os.Args[0], "-test.run=TestHelperProcess", "--", "exec", dir, arg0)
+ cmd.Dir = rootDir
+ cmd.Env = env
+ output, err := cmd.CombinedOutput()
+ err = test.isSuccess(rootDir, string(output), err)
+ if (err != nil) != test.fails {
+ if test.fails {
+ return fmt.Errorf("test=%+v: succeeded, but expected to fail", test)
+ }
+ return err
+ }
+ return nil
+}
+
+func (test commandTest) run(t *testing.T, rootDir, printpathExe string) {
+ createFiles(t, rootDir, test.files, printpathExe)
+ PATHEXT := `.COM;.EXE;.BAT`
+ env := createEnv(rootDir, test.PATH, PATHEXT)
+ env = append(env, "GO_WANT_HELPER_PROCESS=1")
+ err := test.runOne(rootDir, env, test.dir, test.arg0)
+ if err != nil {
+ t.Error(err)
+ }
+}
+
+var commandTests = []commandTest{
+ // testing commands with no slash, like `a.exe`
+ {
+ // should find a.exe in current directory
+ files: []string{`a.exe`},
+ arg0: `a.exe`,
+ want: `a.exe`,
+ },
+ {
+ // like above, but add PATH in attempt to break the test
+ PATH: `p2;p`,
+ files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
+ arg0: `a.exe`,
+ want: `a.exe`,
+ },
+ {
+ // like above, but use "a" instead of "a.exe" for command
+ PATH: `p2;p`,
+ files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
+ arg0: `a`,
+ want: `a.exe`,
+ },
+ // testing commands with slash, like `.\a.exe`
+ {
+ // should find p\a.exe
+ files: []string{`p\a.exe`},
+ arg0: `p\a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but adding `.` in front of executable should still be OK
+ files: []string{`p\a.exe`},
+ arg0: `.\p\a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but with PATH added in attempt to break it
+ PATH: `p2`,
+ files: []string{`p\a.exe`, `p2\a.exe`},
+ arg0: `p\a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but make sure .exe is tried even for commands with slash
+ PATH: `p2`,
+ files: []string{`p\a.exe`, `p2\a.exe`},
+ arg0: `p\a`,
+ want: `p\a.exe`,
+ },
+ // tests commands, like `a.exe`, with c.Dir set
+ {
+ // should not find a.exe in p, because LookPath(`a.exe`) will fail
+ files: []string{`p\a.exe`},
+ dir: `p`,
+ arg0: `a.exe`,
+ want: `p\a.exe`,
+ fails: true,
+ },
+ {
+ // LookPath(`a.exe`) will find `.\a.exe`, but prefixing that with
+ // dir `p\a.exe` will refer to a non-existent file
+ files: []string{`a.exe`, `p\not_important_file`},
+ dir: `p`,
+ arg0: `a.exe`,
+ want: `a.exe`,
+ fails: true,
+ },
+ {
+ // like above, but making test succeed by installing file
+ // in referred destination (so LookPath(`a.exe`) will still
+ // find `.\a.exe`, but we successfully execute `p\a.exe`)
+ files: []string{`a.exe`, `p\a.exe`},
+ dir: `p`,
+ arg0: `a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but add PATH in attempt to break the test
+ PATH: `p2;p`,
+ files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
+ dir: `p`,
+ arg0: `a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but use "a" instead of "a.exe" for command
+ PATH: `p2;p`,
+ files: []string{`a.exe`, `p\a.exe`, `p2\a.exe`},
+ dir: `p`,
+ arg0: `a`,
+ want: `p\a.exe`,
+ },
+ {
+ // finds `a.exe` in the PATH regardless of dir set
+ // because LookPath returns full path in that case
+ PATH: `p2;p`,
+ files: []string{`p\a.exe`, `p2\a.exe`},
+ dir: `p`,
+ arg0: `a.exe`,
+ want: `p2\a.exe`,
+ },
+ // tests commands, like `.\a.exe`, with c.Dir set
+ {
+ // should use dir when command is path, like ".\a.exe"
+ files: []string{`p\a.exe`},
+ dir: `p`,
+ arg0: `.\a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but with PATH added in attempt to break it
+ PATH: `p2`,
+ files: []string{`p\a.exe`, `p2\a.exe`},
+ dir: `p`,
+ arg0: `.\a.exe`,
+ want: `p\a.exe`,
+ },
+ {
+ // like above, but make sure .exe is tried even for commands with slash
+ PATH: `p2`,
+ files: []string{`p\a.exe`, `p2\a.exe`},
+ dir: `p`,
+ arg0: `.\a`,
+ want: `p\a.exe`,
+ },
+}
+
+func TestCommand(t *testing.T) {
+ tmp, err := os.MkdirTemp("", "TestCommand")
+ if err != nil {
+ t.Fatal("TempDir failed: ", err)
+ }
+ defer os.RemoveAll(tmp)
+
+ printpathExe := buildPrintPathExe(t, tmp)
+
+ // Run all tests.
+ for i, test := range commandTests {
+ dir := filepath.Join(tmp, "d"+strconv.Itoa(i))
+ err := os.Mkdir(dir, 0700)
+ if err != nil {
+ t.Fatal("Mkdir failed: ", err)
+ }
+ test.run(t, dir, printpathExe)
+ }
+}
+
+// buildPrintPathExe creates a Go program that prints its own path.
+// dir is a temp directory where executable will be created.
+// The function returns full path to the created program.
+func buildPrintPathExe(t *testing.T, dir string) string {
+ const name = "printpath"
+ srcname := name + ".go"
+ err := os.WriteFile(filepath.Join(dir, srcname), []byte(printpathSrc), 0644)
+ if err != nil {
+ t.Fatalf("failed to create source: %v", err)
+ }
+ if err != nil {
+ t.Fatalf("failed to execute template: %v", err)
+ }
+ outname := name + ".exe"
+ cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", outname, srcname)
+ cmd.Dir = dir
+ out, err := cmd.CombinedOutput()
+ if err != nil {
+ t.Fatalf("failed to build executable: %v - %v", err, string(out))
+ }
+ return filepath.Join(dir, outname)
+}
+
+const printpathSrc = `
+package main
+
+import (
+ "os"
+ "syscall"
+ "unicode/utf16"
+ "unsafe"
+)
+
+func getMyName() (string, error) {
+ var sysproc = syscall.MustLoadDLL("kernel32.dll").MustFindProc("GetModuleFileNameW")
+ b := make([]uint16, syscall.MAX_PATH)
+ r, _, err := sysproc.Call(0, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)))
+ n := uint32(r)
+ if n == 0 {
+ return "", err
+ }
+ return string(utf16.Decode(b[0:n])), nil
+}
+
+func main() {
+ path, err := getMyName()
+ if err != nil {
+ os.Stderr.Write([]byte("getMyName failed: " + err.Error() + "\n"))
+ os.Exit(1)
+ }
+ os.Stdout.Write([]byte(path))
+}
+`
diff --git a/src/os/exec/read3.go b/src/os/exec/read3.go
new file mode 100644
index 0000000..8cc24da
--- /dev/null
+++ b/src/os/exec/read3.go
@@ -0,0 +1,101 @@
+// Copyright 2020 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.
+
+// +build ignore
+
+// This is a test program that verifies that it can read from
+// descriptor 3 and that no other descriptors are open.
+// This is not done via TestHelperProcess and GO_WANT_HELPER_PROCESS
+// because we want to ensure that this program does not use cgo,
+// because C libraries can open file descriptors behind our backs
+// and confuse the test. See issue 25628.
+package main
+
+import (
+ "fmt"
+ "internal/poll"
+ "io"
+ "os"
+ "os/exec"
+ "runtime"
+ "strings"
+)
+
+func main() {
+ fd3 := os.NewFile(3, "fd3")
+ bs, err := io.ReadAll(fd3)
+ if err != nil {
+ fmt.Printf("ReadAll from fd 3: %v\n", err)
+ os.Exit(1)
+ }
+
+ // Now verify that there are no other open fds.
+ // stdin == 0
+ // stdout == 1
+ // stderr == 2
+ // descriptor from parent == 3
+ // All descriptors 4 and up should be available,
+ // except for any used by the network poller.
+ var files []*os.File
+ for wantfd := uintptr(4); wantfd <= 100; wantfd++ {
+ if poll.IsPollDescriptor(wantfd) {
+ continue
+ }
+ 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)
+ fdfile := fmt.Sprintf("/proc/self/fd/%d", wantfd)
+ link, err := os.Readlink(fdfile)
+ fmt.Printf("readlink(%q) = %q, %v\n", fdfile, link, err)
+ var args []string
+ switch runtime.GOOS {
+ case "plan9":
+ args = []string{fmt.Sprintf("/proc/%d/fd", os.Getpid())}
+ case "aix", "solaris", "illumos":
+ args = []string{fmt.Sprint(os.Getpid())}
+ default:
+ args = []string{"-p", fmt.Sprint(os.Getpid())}
+ }
+
+ // Determine which command to use to display open files.
+ ofcmd := "lsof"
+ switch runtime.GOOS {
+ case "dragonfly", "freebsd", "netbsd", "openbsd":
+ ofcmd = "fstat"
+ case "plan9":
+ ofcmd = "/bin/cat"
+ case "aix":
+ ofcmd = "procfiles"
+ case "solaris", "illumos":
+ ofcmd = "pfiles"
+ }
+
+ cmd := exec.Command(ofcmd, args...)
+ out, err := cmd.CombinedOutput()
+ if err != nil {
+ fmt.Fprintf(os.Stderr, "%s failed: %v\n", strings.Join(cmd.Args, " "), err)
+ }
+ fmt.Printf("%s", 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.Stdout.Write(bs)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-27 07:24:27 +0000