65 lines
2.4 KiB
Go
65 lines
2.4 KiB
Go
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// 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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"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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// 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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