mirror of https://github.com/tailscale/tailscale/
tempfork/osexec: remove old fork of os/exec
This package was a temporary fork of os/exec to fix an EINTR loop bug that was fixed upstream for Go 1.15 inpull/946/head8c1db77a92(https://go-review.googlesource.com/c/go/+/232862), in src/os/exec_unix.go:8c1db77a92 (diff-72072cbd53a7240debad8aa506ff7ec795f9cfac7322e779f9bac29a4d0d0bd4)
Brad Fitzpatrick
4 years ago
parent
5b338bf011
commit
8f76548fd9
@ -1,47 +0,0 @@
|
|||||||
This is a temporary fork of Go 1.13's os/exec package,
|
|
||||||
to work around https://github.com/golang/go/issues/36644.
|
|
||||||
|
|
||||||
The main modification (outside of removing some tests that require
|
|
||||||
internal-only packages to run) is:
|
|
||||||
|
|
||||||
```
|
|
||||||
commit 3c66be240f1ee1f1b5f03bed79eb0d9f8c08965a
|
|
||||||
Author: Avery Pennarun <apenwarr@gmail.com>
|
|
||||||
Date: Sun Jan 19 03:17:30 2020 -0500
|
|
||||||
|
|
||||||
Cmd.Wait(): handle EINTR return code from os.Process.Wait().
|
|
||||||
|
|
||||||
This is probably not actually the correct fix; most likely
|
|
||||||
os.Process.Wait() itself should be fixed to retry on EINTR so that it
|
|
||||||
never leaks out of that function. But if we're going to patch a
|
|
||||||
particular module, it's safer to patch a higher-level one like os/exec
|
|
||||||
rather than the os module itself.
|
|
||||||
|
|
||||||
diff --git a/exec.go b/exec.go
|
|
||||||
index 17ef003e..5375e673 100644
|
|
||||||
--- a/exec.go
|
|
||||||
+++ b/exec.go
|
|
||||||
@@ -498,7 +498,21 @@ func (c *Cmd) Wait() error {
|
|
||||||
}
|
|
||||||
c.finished = true
|
|
||||||
|
|
||||||
- state, err := c.Process.Wait()
|
|
||||||
+ var err error
|
|
||||||
+ var state *os.ProcessState
|
|
||||||
+ for {
|
|
||||||
+ state, err = c.Process.Wait()
|
|
||||||
+ if err != nil {
|
|
||||||
+ xe, ok := err.(*os.SyscallError)
|
|
||||||
+ if ok {
|
|
||||||
+ if xe.Unwrap() == syscall.EINTR {
|
|
||||||
+ // temporary error, retry wait syscall
|
|
||||||
+ continue
|
|
||||||
+ }
|
|
||||||
+ }
|
|
||||||
+ }
|
|
||||||
+ break
|
|
||||||
+ }
|
|
||||||
if c.waitDone != nil {
|
|
||||||
close(c.waitDone)
|
|
||||||
}
|
|
||||||
```
|
|
||||||
@ -1,23 +0,0 @@
|
|||||||
// 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)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,39 +0,0 @@
|
|||||||
// 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)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,156 +0,0 @@
|
|||||||
// 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"
|
|
||||||
"io/ioutil"
|
|
||||||
"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, _ := ioutil.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.
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,797 +0,0 @@
|
|||||||
// 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"
|
|
||||||
"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 {
|
|
||||||
if c.Env != nil {
|
|
||||||
return c.Env
|
|
||||||
}
|
|
||||||
return os.Environ()
|
|
||||||
}
|
|
||||||
|
|
||||||
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.
|
|
||||||
// It is non-nil everywhere but Plan 9, which lacks EPIPE. See exec_posix.go.
|
|
||||||
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.
|
|
||||||
//
|
|
||||||
// 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...)
|
|
||||||
|
|
||||||
var err error
|
|
||||||
c.Process, err = os.StartProcess(c.Path, c.argv(), &os.ProcAttr{
|
|
||||||
Dir: c.Dir,
|
|
||||||
Files: c.childFiles,
|
|
||||||
Env: addCriticalEnv(dedupEnv(c.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
|
|
||||||
|
|
||||||
var err error
|
|
||||||
var state *os.ProcessState
|
|
||||||
for {
|
|
||||||
state, err = c.Process.Wait()
|
|
||||||
if err != nil {
|
|
||||||
xe, ok := err.(*os.SyscallError)
|
|
||||||
if ok {
|
|
||||||
if xe.Unwrap() == syscall.EINTR {
|
|
||||||
// temporary error, retry wait syscall
|
|
||||||
continue
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
break
|
|
||||||
}
|
|
||||||
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; however, an implication is that
|
|
||||||
// it is 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; however, an implication is that
|
|
||||||
// it is 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"))
|
|
||||||
}
|
|
||||||
@ -1,24 +0,0 @@
|
|||||||
// 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 (
|
|
||||||
"os"
|
|
||||||
"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.(*os.PathError)
|
|
||||||
return ok &&
|
|
||||||
pe.Op == "write" && pe.Path == "|1" &&
|
|
||||||
pe.Err == syscall.EPIPE
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,23 +0,0 @@
|
|||||||
// 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 (
|
|
||||||
"os"
|
|
||||||
"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.(*os.PathError)
|
|
||||||
return ok &&
|
|
||||||
pe.Op == "write" && pe.Path == "|1" &&
|
|
||||||
(pe.Err == syscall.ERROR_BROKEN_PIPE || pe.Err == _ERROR_NO_DATA)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,61 +0,0 @@
|
|||||||
// 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)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,23 +0,0 @@
|
|||||||
// 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}
|
|
||||||
}
|
|
||||||
@ -1,55 +0,0 @@
|
|||||||
// 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"
|
|
||||||
"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 os.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}
|
|
||||||
}
|
|
||||||
@ -1,33 +0,0 @@
|
|||||||
// 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)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,58 +0,0 @@
|
|||||||
// 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 nacl netbsd openbsd solaris
|
|
||||||
|
|
||||||
package exec
|
|
||||||
|
|
||||||
import (
|
|
||||||
"errors"
|
|
||||||
"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 os.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}
|
|
||||||
}
|
|
||||||
@ -1,50 +0,0 @@
|
|||||||
// 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 := t.TempDir()
|
|
||||||
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)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@ -1,93 +0,0 @@
|
|||||||
// 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"
|
|
||||||
"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 os.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 "", os.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}
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue