[PATCH v2] linux: return UNSUPPORTED in tst-mount if !support_can_chroot

[Florian Weimer]

* Carlos O'Donell:

>> I think you should call and check support_enter_mount_namespace instead,
>> to make sure that the test does not modify the original mount namespace.
>
> Like this in the child?
>
> diff --git a/sysdeps/unix/sysv/linux/tst-mount.c b/sysdeps/unix/sysv/linux/tst-mount.c
> index 502d7e3433..d19d70d42d 100644
> --- a/sysdeps/unix/sysv/linux/tst-mount.c
> +++ b/sysdeps/unix/sysv/linux/tst-mount.c
> @@ -107,7 +107,11 @@ do_test (void)
>  
>    pid_t pid = xfork ();
>    if (pid == 0)
> -    subprocess ();
> +    {
> +      if (!support_enter_mount_namespace ())
> +        FAIL_UNSUPPORTED ("could not enter new mount namespace");
> +      subprocess ();
> +    }

Yes, except that you need to change

  xwaitpid (pid, &status, 0);
  TEST_VERIFY (WIFEXITED (status));

as well, to handle status 77.

I'm not entirely sure the fork is necessary, though.

Thanks,
Florian