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127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
/*
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Copyright (c) 2009 The Go Authors. All rights reserved.
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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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* 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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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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*/
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package resolvepath
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import (
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"errors"
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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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// 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 chkStat(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 d.IsDir() {
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return os.ErrPermission
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}
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return nil
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}
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func hasExt(file string) bool {
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i := strings.LastIndex(file, ".")
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if i < 0 {
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return false
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}
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return strings.LastIndexAny(file, `:\/`) < i
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}
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func findExecutable(file string, exts []string) (string, error) {
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if len(exts) == 0 {
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return file, chkStat(file)
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}
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if hasExt(file) {
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if chkStat(file) == nil {
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return file, nil
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}
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}
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for _, e := range exts {
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if f := file + e; chkStat(f) == nil {
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return f, nil
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}
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}
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return "", os.ErrNotExist
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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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// LookPath also uses PATHEXT environment variable to match
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// a suitable candidate.
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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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var exts []string
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x := os.Getenv(`PATHEXT`)
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if x != "" {
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for _, e := range strings.Split(strings.ToLower(x), `;`) {
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if e == "" {
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continue
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}
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if e[0] != '.' {
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e = "." + e
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}
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exts = append(exts, e)
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}
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} else {
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exts = []string{".com", ".exe", ".bat", ".cmd"}
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}
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if strings.ContainsAny(file, `:\/`) {
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if f, err := findExecutable(file, exts); err == nil {
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return f, nil
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} else {
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return "", &exec.Error{file, err}
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}
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}
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// See https://github.com/golang/go/issues/38736
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// DO NOT lookup current folder
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//if f, err := findExecutable(filepath.Join(".", file), exts); err == nil {
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// return f, nil
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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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// empty dir means dupicate semicolon in PATH, should not resolve files in current working dir...
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if strings.TrimSpace(dir) == "" {
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continue
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}
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if f, err := findExecutable(filepath.Join(dir, file), exts); err == nil {
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return f, nil
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}
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}
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return "", &exec.Error{file, ErrNotFound}
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}
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