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-rw-r--r--src/os/executable_test.go88
1 files changed, 88 insertions, 0 deletions
diff --git a/src/os/executable_test.go b/src/os/executable_test.go
new file mode 100644
index 0000000..f25ee0c
--- /dev/null
+++ b/src/os/executable_test.go
@@ -0,0 +1,88 @@
+// 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)
+ }
+}