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2fc67e71af
// Executable returns the path name for the executable that started
// the current process. There is no guarantee that the path is still
// pointing to the correct executable. If a symlink was used to start
// the process, depending on the operating system, the result might
// be the symlink or the path it pointed to. If a stable result is
// needed, path/filepath.EvalSymlinks might help.
//
// Executable returns an absolute path unless an error occurred.
//
// The main use case is finding resources located relative to an
// executable.
//
// Executable is not supported on nacl or OpenBSD (unless procfs is
// mounted.)
func Executable() (string, error) {
return executable()
}
Fixes #12773.
Change-Id: I469738d905b12f0b633ea4d88954f8859227a88c
Reviewed-on: https://go-review.googlesource.com/16551
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os_test
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import (
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"fmt"
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"internal/testenv"
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"os"
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osexec "os/exec"
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"path/filepath"
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"runtime"
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"testing"
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)
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const executable_EnvVar = "OSTEST_OUTPUT_EXECPATH"
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func TestExecutable(t *testing.T) {
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testenv.MustHaveExec(t) // will also execlude nacl, which doesn't support Executable anyway
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ep, err := os.Executable()
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if err != nil {
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switch goos := runtime.GOOS; goos {
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case "openbsd": // procfs is not mounted by default
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t.Skipf("Executable failed on %s: %v, expected", goos, err)
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}
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t.Fatalf("Executable failed: %v", err)
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}
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// we want fn to be of the form "dir/prog"
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dir := filepath.Dir(filepath.Dir(ep))
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fn, err := filepath.Rel(dir, ep)
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if err != nil {
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t.Fatalf("filepath.Rel: %v", err)
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}
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cmd := &osexec.Cmd{}
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// make child start with a relative program path
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cmd.Dir = dir
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cmd.Path = fn
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// forge argv[0] for child, so that we can verify we could correctly
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// get real path of the executable without influenced by argv[0].
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cmd.Args = []string{"-", "-test.run=XXXX"}
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cmd.Env = append(os.Environ(), fmt.Sprintf("%s=1", executable_EnvVar))
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("exec(self) failed: %v", err)
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}
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outs := string(out)
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if !filepath.IsAbs(outs) {
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t.Fatalf("Child returned %q, want an absolute path", out)
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}
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if !sameFile(outs, ep) {
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t.Fatalf("Child returned %q, not the same file as %q", out, ep)
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}
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}
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func sameFile(fn1, fn2 string) bool {
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fi1, err := os.Stat(fn1)
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if err != nil {
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return false
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}
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fi2, err := os.Stat(fn2)
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if err != nil {
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return false
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}
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return os.SameFile(fi1, fi2)
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}
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func init() {
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if e := os.Getenv(executable_EnvVar); e != "" {
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// first chdir to another path
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dir := "/"
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if runtime.GOOS == "windows" {
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cwd, err := os.Getwd()
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if err != nil {
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panic(err)
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}
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dir = filepath.VolumeName(cwd)
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}
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os.Chdir(dir)
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if ep, err := os.Executable(); err != nil {
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fmt.Fprint(os.Stderr, "ERROR: ", err)
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} else {
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fmt.Fprint(os.Stderr, ep)
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}
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os.Exit(0)
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}
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}
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