[bug#34971] [PATCH] gnu: Add mako.

[Meiyo Peng]

Hi Ludovic,

Ludovic Courtès writes:

> Meiyo Peng <address@hidden> skribis:
>
>> Ludovic Courtès writes:
>>
>>> Meiyo Peng <address@hidden> skribis:
>>>
>>>> If you have trouble running mako and mako gives you an error message
>>>> like:
>>>>
>>>> #+begin_example
>>>>   Failed to connect to user bus: No such file or directory
>>>> #+end_example
>>>
>>> I would expect Mako to automatically spawn the D-Bus user bus if it’s
>>> not already needed, no?  We don’t need to do anything special with other
>>> D-Bus applications AFAIK.
>>
>> Yeah.  I expect that too.  I am not sure why mako is so special.  mako
>> uses the sd-bus library of systemd/elogind instead of libdbus.  Do you
>> think that could be the cause?
>
> Could you check with ‘strace’ whether it tries to connect to
> /run/dbus/system_bus_socket instead of /var/run/dbus/system_bus_socket?

I get this output from `strace mako`:

#+begin_example
  ...
  socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
  getsockopt(3, SOL_SOCKET, SO_RCVBUF, [212992], [4]) = 0
  setsockopt(3, SOL_SOCKET, SO_RCVBUF, [8388608], 4) = 0
  getsockopt(3, SOL_SOCKET, SO_SNDBUF, [212992], [4]) = 0
  setsockopt(3, SOL_SOCKET, SO_SNDBUF, [8388608], 4) = 0
  connect(3, {sa_family=AF_UNIX, sun_path="/run/user/1000/bus"}, 21) = -1 
ENOENT (No such file or directory)
  close(3)                                = 0
  write(2, "Failed to connect to user bus: N"..., 57Failed to connect to user 
bus: No such file or directory
  ) = 57
  exit_group(1)                           = ?
  +++ exited with 1 +++
#+end_example

It tries to connect to /run/user/1000/bus.

And that error message is from
https://github.com/emersion/mako/blob/master/dbus/dbus.c:

#+begin_src c
  ret = sd_bus_open_user(&state->bus);
  if (ret < 0) {
      fprintf(stderr, "Failed to connect to user bus: %s\n", strerror(-ret));
      goto error;
  }
#+end_src

--
Meiyo Peng
https://www.pengmeiyu.com/