mirror of
https://github.com/golang/go
synced 2024-11-06 14:16:15 -07:00
c007ce824d
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
// 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"
|
|
"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 binary 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 strings.Split(path, "\000") {
|
|
if err := findExecutable(dir + "/" + file); err == nil {
|
|
return dir + "/" + file, nil
|
|
}
|
|
}
|
|
return "", &Error{file, ErrNotFound}
|
|
}
|