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027855e8d8
The changes are likely to break users, and we need to make it easy to unbreak without code changes. For #43724. Fixes #53962. Change-Id: I105c5d6c801d354467e0cefd268189c18846858e Reviewed-on: https://go-review.googlesource.com/c/go/+/419794 Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Russ Cox <rsc@golang.org>
67 lines
1.9 KiB
Go
67 lines
1.9 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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//go:build unix
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package exec
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import (
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"errors"
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"internal/godebug"
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"io/fs"
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"os"
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"path/filepath"
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"strings"
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)
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// ErrNotFound is the error resulting if a path search failed to find an executable file.
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var ErrNotFound = errors.New("executable file not found in $PATH")
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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 fs.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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// Otherwise, on success, the result is an absolute path.
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//
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// In older versions of Go, LookPath could return a path relative to the current directory.
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// As of Go 1.19, LookPath will instead return that path along with an error satisfying
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// errors.Is(err, ErrDot). See the package documentation for more details.
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func LookPath(file 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 "", &Error{file, err}
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}
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path := os.Getenv("PATH")
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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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if !filepath.IsAbs(path) && godebug.Get("execerrdot") != "0" {
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return path, &Error{file, ErrDot}
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}
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return path, nil
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}
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}
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return "", &Error{file, ErrNotFound}
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}
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