7cd7bb0a1f
It's common for Windows machines to have trailing empty PATH components and users there don't expect that to mean "." like it does on Unix. To avoid unexpected behavior and somewhat improve security, treat the empty PATH component differently on Windows.
71 lines
2.6 KiB
Go
71 lines
2.6 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package subprocess
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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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"runtime"
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"strings"
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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 string) (string, error) {
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sep := string([]rune{os.PathSeparator})
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exts := findPathExtensions()
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if strings.Contains(file, sep) {
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path, err := findExecutable(file, exts)
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if err == nil {
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return path, nil
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}
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return "", exec.ErrNotFound
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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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// Windows often has empty components in the PATH and
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// treating them as "." is not expected.
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if runtime.GOOS == "windows" {
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continue
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}
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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 resolved, err := findExecutable(path, exts); err == nil {
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return resolved, nil
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}
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}
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return "", exec.ErrNotFound
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}
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