main: accept -dev, -nodev, -suid, -nosuid, -exec, -noexec

When mounted via /etc/fstab like this,

  /a /b fuse.gocryptfs default 0 0

we always get extra options passed. As reported by @mahkoh
at https://github.com/rfjakob/gocryptfs/pull/233 :

  mount passes `-o noexec` if `-o user` is set and `-o exec` is not set.
  If both `-o user` and `-o exec` are set, it passes `-o exec`.

Make these options work, and in addtion, also make -suid and -rw
work the same way.

Reported-by: @mahkoh

2 files changed, 32 insertions, 3 deletions

diff --git a/tests/cli/cli_test.go b/tests/cli/cli_test.go
index 8808742..5508360 100644
--- a/tests/cli/cli_test.go
+++ b/tests/cli/cli_test.go
@@ -449,6 +449,30 @@ func TestMultipleOperationFlags(t *testing.T) {
 	}
 }
 
+func TestNoexec(t *testing.T) {
+	dir := test_helpers.InitFS(t)
+	mnt := dir + ".mnt"
+	err := os.Mkdir(mnt, 0700)
+	if err != nil {
+		t.Fatal(err)
+	}
+	test_helpers.MountOrFatal(t, dir, mnt, "-extpass=echo test", "-noexec")
+	defer test_helpers.UnmountPanic(mnt)
+	sh := mnt + "/x.sh"
+	content := `#!/bin/bash
+echo hello
+`
+	err = ioutil.WriteFile(sh, []byte(content), 0755)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = exec.Command(sh).Run()
+	exitCode := test_helpers.ExtractCmdExitCode(err)
+	if exitCode != int(syscall.EACCES) {
+		t.Errorf("got exitcode %d instead of EPERM (%d)", exitCode, syscall.EPERM)
+	}
+}
+
 // Test that a missing argument to "-o" triggers exit code 1.
 // See also cli_args_test.go for comprehensive tests of "-o" parsing.
 func TestMissingOArg(t *testing.T) {
diff --git a/tests/test_helpers/helpers.go b/tests/test_helpers/helpers.go
index e7fcf4b..ef748e2 100644
--- a/tests/test_helpers/helpers.go
+++ b/tests/test_helpers/helpers.go
@@ -433,9 +433,14 @@ func ExtractCmdExitCode(err error) int {
 		return 0
 	}
 	// OMG this is convoluted
-	err2 := err.(*exec.ExitError)
-	code := err2.Sys().(syscall.WaitStatus).ExitStatus()
-	return code
+	if err2, ok := err.(*exec.ExitError); ok {
+		return err2.Sys().(syscall.WaitStatus).ExitStatus()
+	}
+	if err2, ok := err.(*os.PathError); ok {
+		return int(err2.Err.(syscall.Errno))
+	}
+	log.Panicf("could not decode error %#v", err)
+	return 0
 }
 
 // ListFds lists our open file descriptors.