Re: [PATCH 2/3] img/app: dbus: don't listen on VSOCK

[Demi Marie Obenour <demiobenour@gmail.com>]

[-- Attachment #1.1.1: Type: text/plain, Size: 2002 bytes --]

On 11/14/25 06:45, Alyssa Ross wrote:
> Demi Marie Obenour <demiobenour@gmail.com> writes:
> 
>> On 11/13/25 12:56, Alyssa Ross wrote:
>>> Demi Marie Obenour <demiobenour@gmail.com> writes:
>>>
>>>>> diff --git a/img/app/image/etc/s6-rc/dbus-vsock/notification-fd.license b/img/app/image/etc/s6-rc/dbus-vsock/notification-fd.license
>>>>> new file mode 100644
>>>>> index 0000000..0d3d47c
>>>>> --- /dev/null
>>>>> +++ b/img/app/image/etc/s6-rc/dbus-vsock/notification-fd.license
>>>>> @@ -0,0 +1,2 @@
>>>>> +SPDX-License-Identifier: CC0-1.0
>>>>> +SPDX-FileCopyrightText: 2025 Alyssa Ross <hi@alyssa.is>
>>>>> diff --git a/img/app/image/etc/s6-rc/dbus-vsock/run b/img/app/image/etc/s6-rc/dbus-vsock/run
>>>>> new file mode 100755
>>>>> index 0000000..37fae7d
>>>>> --- /dev/null
>>>>> +++ b/img/app/image/etc/s6-rc/dbus-vsock/run
>>>>> @@ -0,0 +1,17 @@
>>>>> +#!/bin/execlineb -P
>>>>> +# SPDX-License-Identifier: EUPL-1.2+
>>>>> +# SPDX-FileCopyrightText: 2025 Alyssa Ross <hi@alyssa.is>
>>>>> +
>>>>> +if { modprobe vsock }
>>>>> +
>>>>> +export LISTEN_FDS 1
>>>>> +getpid LISTEN_PID
>>>>> +export SYSTEMD_LOG_LEVEL notice
>>>>> +
>>>>> +systemd-socket-activate -l vsock::219 --now
>>>>> +
>>>>> +# Notify readiness.
>>>>> +if { fdmove 1 3 echo }
>>>>> +fdclose 3
>>>>> +
>>>>> +socat ACCEPT-FD:4,fork UNIX-CONNECT:/run/session-bus
>>>>
>>>> I'd prefer to use NOTIFY_SOCKET here.
>>>
>>> Then we have to run a whole background process to translate the
>>> systemd protocol to the s6 one.  Doesn't seem worth it to me.
>> Whoops, wrong environment variable name :).  I meant $LISTEN_FDS.
> 
> I still don't understand what you mean.  You'd like this to calculate
> 2 + LISTEN_FDS, and substitute that into the socat command line, even
> though we know the result will always be 4?

Oh, I hadn't thought of that.  systemd does support named file
descriptors, which do need a more complex calculation.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)

[-- Attachment #1.1.2: OpenPGP public key --]
[-- Type: application/pgp-keys, Size: 7253 bytes --]

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]