// Copyright 2016 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 os_test
|
|
import (
|
"fmt"
|
"internal/testenv"
|
"os"
|
osexec "os/exec"
|
"path/filepath"
|
"runtime"
|
"testing"
|
)
|
|
const executable_EnvVar = "OSTEST_OUTPUT_EXECPATH"
|
|
func TestExecutable(t *testing.T) {
|
testenv.MustHaveExec(t) // will also exclude nacl, which doesn't support Executable anyway
|
ep, err := os.Executable()
|
if err != nil {
|
t.Fatalf("Executable failed: %v", err)
|
}
|
// we want fn to be of the form "dir/prog"
|
dir := filepath.Dir(filepath.Dir(ep))
|
fn, err := filepath.Rel(dir, ep)
|
if err != nil {
|
t.Fatalf("filepath.Rel: %v", err)
|
}
|
|
cmd := &osexec.Cmd{}
|
// make child start with a relative program path
|
cmd.Dir = dir
|
cmd.Path = fn
|
// forge argv[0] for child, so that we can verify we could correctly
|
// get real path of the executable without influenced by argv[0].
|
cmd.Args = []string{"-", "-test.run=XXXX"}
|
if runtime.GOOS == "openbsd" || runtime.GOOS == "aix" {
|
// OpenBSD and AIX rely on argv[0]
|
cmd.Args[0] = fn
|
}
|
cmd.Env = append(os.Environ(), fmt.Sprintf("%s=1", executable_EnvVar))
|
out, err := cmd.CombinedOutput()
|
if err != nil {
|
t.Fatalf("exec(self) failed: %v", err)
|
}
|
outs := string(out)
|
if !filepath.IsAbs(outs) {
|
t.Fatalf("Child returned %q, want an absolute path", out)
|
}
|
if !sameFile(outs, ep) {
|
t.Fatalf("Child returned %q, not the same file as %q", out, ep)
|
}
|
}
|
|
func sameFile(fn1, fn2 string) bool {
|
fi1, err := os.Stat(fn1)
|
if err != nil {
|
return false
|
}
|
fi2, err := os.Stat(fn2)
|
if err != nil {
|
return false
|
}
|
return os.SameFile(fi1, fi2)
|
}
|
|
func init() {
|
if e := os.Getenv(executable_EnvVar); e != "" {
|
// first chdir to another path
|
dir := "/"
|
if runtime.GOOS == "windows" {
|
cwd, err := os.Getwd()
|
if err != nil {
|
panic(err)
|
}
|
dir = filepath.VolumeName(cwd)
|
}
|
os.Chdir(dir)
|
if ep, err := os.Executable(); err != nil {
|
fmt.Fprint(os.Stderr, "ERROR: ", err)
|
} else {
|
fmt.Fprint(os.Stderr, ep)
|
}
|
os.Exit(0)
|
}
|
}
|
