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// 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)
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)
}
}
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