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// Copyright 2012 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.
// +build darwin linux freebsd netbsd windows
package osext
import (
"fmt"
"os"
oexec "os/exec"
"path/filepath"
"runtime"
"testing"
)
const execPath_EnvVar = "OSTEST_OUTPUT_EXECPATH"
func TestExecPath(t *testing.T) {
ep, err := Executable()
if err != nil {
t.Fatalf("ExecPath 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 := &oexec.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"}
cmd.Env = []string{fmt.Sprintf("%s=1", execPath_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(execPath_EnvVar); e != "" {
// first chdir to another path
dir := "/"
if runtime.GOOS == "windows" {
dir = filepath.VolumeName(".")
}
os.Chdir(dir)
if ep, err := Executable(); err != nil {
fmt.Fprint(os.Stderr, "ERROR: ", err)
} else {
fmt.Fprint(os.Stderr, ep)
}
os.Exit(0)
}
}
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