54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
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package exec
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import (
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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)
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func findExecutable(file string) error {
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d, err := os.Stat(file)
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if err != nil {
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return err
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}
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if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
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return nil
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}
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return os.ErrPermission
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}
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// LookPath searches for an executable named file in the
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// directories named by the PATH environment variable.
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// If file contains a slash, it is tried directly and the PATH is not consulted.
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// The result may be an absolute path or a path relative to the current directory.
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func LookPath(file, path string) (string, error) {
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// NOTE(rsc): I wish we could use the Plan 9 behavior here
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// (only bypass the path if file begins with / or ./ or ../)
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// but that would not match all the Unix shells.
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if strings.Contains(file, "/") {
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err := findExecutable(file)
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if err == nil {
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return file, nil
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}
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return "", &exec.Error{file, err}
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}
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for _, dir := range filepath.SplitList(path) {
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if dir == "" {
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// Unix shell semantics: path element "" means "."
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dir = "."
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}
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path := filepath.Join(dir, file)
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if err := findExecutable(path); err == nil {
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return path, nil
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}
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}
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return "", &exec.Error{file, exec.ErrNotFound}
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}
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