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exec.LookPath() unix/windows separation
R=brainman, rsc, vcc, rsc1 CC=golang-dev https://golang.org/cl/2068041
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| // Copyright 2010 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| package exec | ||
|
|
||
| import ( | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| func canExec(file string) bool { | ||
| d, err := os.Stat(file) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| return d.IsRegular() && d.Permission()&0111 != 0 | ||
| } | ||
|
|
||
| // LookPath searches for an executable binary 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. | ||
| func LookPath(file string) (string, os.Error) { | ||
| // NOTE(rsc): I wish we could use the Plan 9 behavior here | ||
| // (only bypass the path if file begins with / or ./ or ../) | ||
| // but that would not match all the Unix shells. | ||
|
|
||
| if strings.Index(file, "/") >= 0 { | ||
| if canExec(file) { | ||
| return file, nil | ||
| } | ||
| return "", os.ENOENT | ||
| } | ||
| pathenv := os.Getenv("PATH") | ||
| for _, dir := range strings.Split(pathenv, ":", -1) { | ||
| if dir == "" { | ||
| // Unix shell semantics: path element "" means "." | ||
| dir = "." | ||
| } | ||
| if canExec(dir + "/" + file) { | ||
| return dir + "/" + file, nil | ||
| } | ||
| } | ||
| return "", os.ENOENT | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| // Copyright 2010 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| package exec | ||
|
|
||
| import ( | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| func chkStat(file string) bool { | ||
| d, err := os.Stat(file) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| return d.IsRegular() | ||
| } | ||
|
|
||
| func canExec(file string, exts []string) (string, bool) { | ||
| if len(exts) == 0 { | ||
| return file, chkStat(file) | ||
| } | ||
| f := strings.ToLower(file) | ||
| for _, e := range exts { | ||
| if strings.HasSuffix(f, e) { | ||
| return file, chkStat(file) | ||
| } | ||
| } | ||
| for _, e := range exts { | ||
| if f := file + e; chkStat(f) { | ||
| return f, true | ||
| } | ||
| } | ||
| return ``, false | ||
| } | ||
|
|
||
| func LookPath(file string) (string, os.Error) { | ||
| exts := []string{} | ||
| if x := os.Getenv(`PATHEXT`); x != `` { | ||
| exts = strings.Split(strings.ToLower(x), `;`, -1) | ||
| for i, e := range exts { | ||
| if e == `` || e[0] != '.' { | ||
| exts[i] = `.` + e | ||
| } | ||
| } | ||
| } | ||
| if strings.Index(file, `\`) >= 0 || strings.Index(file, `/`) >= 0 { | ||
| if f, ok := canExec(file, exts); ok { | ||
| return f, nil | ||
| } | ||
| return ``, os.ENOENT | ||
| } | ||
| if pathenv := os.Getenv(`PATH`); pathenv == `` { | ||
| if f, ok := canExec(`.\`+file, exts); ok { | ||
| return f, nil | ||
| } | ||
| } else { | ||
| for _, dir := range strings.Split(pathenv, `;`, -1) { | ||
| if f, ok := canExec(dir+`\`+file, exts); ok { | ||
| return f, nil | ||
| } | ||
| } | ||
| } | ||
| return ``, os.ENOENT | ||
| } |