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Ensure only $PATH is searched when switching to external commands
I added a work around to the exec.LookPath issue (golang/go#38736) on windows
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| // +build !windows | ||
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| package execext | ||
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| import "os/exec" | ||
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| // LookPath searches for an executable named file in the directories named by | ||
| // the PATH environment variable. | ||
| // If file contains a slash, it is tried directly and the PATH is not consulted. | ||
| // The result may be an absolute path or a path relative to the current directory. | ||
| func LookPath(file string) (string, error) { | ||
| return exec.LookPath(file) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| // Copyright (c) 2009 The Go Authors. All rights reserved. | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without | ||
| // modification, are permitted provided that the following conditions are | ||
| // met: | ||
| // | ||
| // * Redistributions of source code must retain the above copyright | ||
| // notice, this list of conditions and the following disclaimer. | ||
| // * Redistributions in binary form must reproduce the above | ||
| // copyright notice, this list of conditions and the following disclaimer | ||
| // in the documentation and/or other materials provided with the | ||
| // distribution. | ||
| // * Neither the name of Google Inc. nor the names of its | ||
| // contributors may be used to endorse or promote products derived from | ||
| // this software without specific prior written permission. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
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| // EXTENDED: | ||
| // This package provides an alternative LookPath function to avoid accidentally | ||
| // executing matching binaries in the current directory on windows | ||
| package execext | ||
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| import ( | ||
| "errors" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
| ) | ||
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| // ErrNotFound is the error resulting if a path search failed to find an executable file. | ||
| var ErrNotFound = errors.New("executable file not found in %PATH%") | ||
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| func chkStat(file string) error { | ||
| d, err := os.Stat(file) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if d.IsDir() { | ||
| return os.ErrPermission | ||
| } | ||
| return nil | ||
| } | ||
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| func hasExt(file string) bool { | ||
| i := strings.LastIndex(file, ".") | ||
| if i < 0 { | ||
| return false | ||
| } | ||
| return strings.LastIndexAny(file, `:\/`) < i | ||
| } | ||
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| func findExecutable(file string, exts []string) (string, error) { | ||
| if len(exts) == 0 { | ||
| return file, chkStat(file) | ||
| } | ||
| if hasExt(file) { | ||
| if chkStat(file) == nil { | ||
| return file, nil | ||
| } | ||
| } | ||
| for _, e := range exts { | ||
| if f := file + e; chkStat(f) == nil { | ||
| return f, nil | ||
| } | ||
| } | ||
| return "", os.ErrNotExist | ||
| } | ||
|
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| // LookPath searches for an executable named file in the | ||
| // directories named by the PATH environment variable. | ||
| // If file contains a slash, it is tried directly and the PATH is not consulted. | ||
| // LookPath also uses PATHEXT environment variable to match | ||
| // a suitable candidate. | ||
| // The result may be an absolute path or a path relative to the current directory. | ||
| func LookPath(file string) (string, error) { | ||
| var exts []string | ||
| x := os.Getenv(`PATHEXT`) | ||
| if x != "" { | ||
| for _, e := range strings.Split(strings.ToLower(x), `;`) { | ||
| if e == "" { | ||
| continue | ||
| } | ||
| if e[0] != '.' { | ||
| e = "." + e | ||
| } | ||
| exts = append(exts, e) | ||
| } | ||
| } else { | ||
| exts = []string{".com", ".exe", ".bat", ".cmd"} | ||
| } | ||
|
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| if strings.ContainsAny(file, `:\/`) { | ||
| if f, err := findExecutable(file, exts); err == nil { | ||
| return f, nil | ||
| } else { | ||
| return "", &Error{file, err} | ||
| } | ||
| } | ||
| // EXTENDED: this is the only part removed to avoid searching for executables in the | ||
| // current directory | ||
| // Check https://github.com/golang/go/issues/38736 | ||
| // if f, err := findExecutable(filepath.Join(".", file), exts); err == nil { | ||
| // return f, nil | ||
| // } | ||
| path := os.Getenv("path") | ||
| for _, dir := range filepath.SplitList(path) { | ||
| if f, err := findExecutable(filepath.Join(dir, file), exts); err == nil { | ||
| return f, nil | ||
| } | ||
| } | ||
| return "", &Error{file, ErrNotFound} | ||
| } |