Re: [RFC PATCH] Run PipeWire and WirePlumber in the VMs

Alyssa Ross
2025-06-26T08:36:33Z

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Demi Marie Obenour <demiobenour@gmail.com> writes:

> WirePlumber is completely overkill as a session manager here, and
> ideally a trivial session manager would be used instead. Also, this
> code has seen absolutely no testing beyond "it builds", not least
> because there is no way to add a virtio-sound device to Cloud Hypervisor
> yet and I haven't tried using QEMU TCG.
>
> Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>

We indeed can't test sound works, but doat least try running the VM and
make sure that it works like it did before! With this applied, the
application no longer starts, because the new files weren't added to the
Makefile.

Well done for figuring out s6 though. :)

> ---
> img/app/default.nix | 5 ++++-
> img/app/etc/fstab | 5 +++--
> .../etc/s6-rc/app/dependencies.d/wireplumber | 0
> img/app/etc/s6-rc/directories/type | 1 +
> img/app/etc/s6-rc/directories/up | 11 ++++++++++
> .../s6-rc/pipewire/dependencies.d/directories | 0
> img/app/etc/s6-rc/pipewire/notification-fd | 1 +
> img/app/etc/s6-rc/pipewire/run | 20 +++++++++++++++++++
> img/app/etc/s6-rc/pipewire/type | 1 +
> .../dependencies.d/directories | 0
> img/app/etc/s6-rc/wayland-proxy-virtwl/run | 11 ----------
> .../etc/s6-rc/wireplumber/dependencies.d/dbus | 0
> .../s6-rc/wireplumber/dependencies.d/pipewire | 0
> img/app/etc/s6-rc/wireplumber/run | 16 +++++++++++++++
> img/app/etc/s6-rc/wireplumber/type | 1 +
> 15 files changed, 58 insertions(+), 14 deletions(-)
> create mode 100644 img/app/etc/s6-rc/app/dependencies.d/wireplumber
> create mode 100644 img/app/etc/s6-rc/directories/type
> create mode 100644 img/app/etc/s6-rc/directories/up
> create mode 100644 img/app/etc/s6-rc/pipewire/dependencies.d/directories
> create mode 100644 img/app/etc/s6-rc/pipewire/notification-fd
> create mode 100644 img/app/etc/s6-rc/pipewire/run
> create mode 100644 img/app/etc/s6-rc/pipewire/type
> create mode 100644 img/app/etc/s6-rc/wayland-proxy-virtwl/dependencies.d/directories
> create mode 100644 img/app/etc/s6-rc/wireplumber/dependencies.d/dbus
> create mode 100644 img/app/etc/s6-rc/wireplumber/dependencies.d/pipewire
> create mode 100644 img/app/etc/s6-rc/wireplumber/run
> create mode 100644 img/app/etc/s6-rc/wireplumber/type

Files that can't include comments need to have .license files next to
them for "reuse lint" to pass. (This is one of the checks included if
you do a full release build by building release.nix.)

> diff --git a/img/app/default.nix b/img/app/default.nix
> index a196205..32ddb67 100644
> --- a/img/app/default.nix
> +++ b/img/app/default.nix
> @@ -8,7 +8,7 @@ pkgsStatic.callPackage (
> { lib, stdenvNoCC, runCommand, writeClosure
> , erofs-utils, jq, s6-rc, util-linux
> , busybox, cacert, dejavu_fonts, execline, kmod, linux_latest, mdevd, s6
> -, s6-linux-init, xdg-desktop-portal-spectrum,
> +, s6-linux-init, xdg-desktop-portal-spectrum
> }:
>
> let
> @@ -48,6 +48,9 @@ let
> pkgs.xwayland
> pkgs.xdg-desktop-portal
> pkgs.xdg-desktop-portal-gtk
> + # Depends on pulseaudio libs
> + pkgs.pipewire
> + pkgs.wireplumber
> ];
> })).fhsenv;
> in
> diff --git a/img/app/etc/fstab b/img/app/etc/fstab
> index a95088b..40aa3bd 100644
> --- a/img/app/etc/fstab
> +++ b/img/app/etc/fstab
> @@ -1,7 +1,8 @@
> # SPDX-License-Identifier: CC0-1.0
> # SPDX-FileCopyrightText: 2020-2022 Alyssa Ross <hi@alyssa.is>
> proc /proc proc defaults 0 0
> -devpts /dev/pts devpts defaults,gid=4,mode=620 0 0
> +devpts /dev/pts devpts defaults,gid=4,mode=620 0 0
> tmpfs /dev/shm tmpfs defaults 0 0
> sysfs /sys sysfs defaults 0 0
> -tmpfs /tmp tmpfs defaults 0 0
> +tmpfs /tmp tmpfs defaults,mode=1755 0 0

Want to send the permissions changes from this patch separately? We
probably need to check the permissions for all mountpoints across hosts
and guests.

> +tmpfs /run tmpfs defaults 0 0

We already have /run from s6-linux-init.

> diff --git a/img/app/etc/s6-rc/pipewire/notification-fd b/img/app/etc/s6-rc/pipewire/notification-fd
> new file mode 100644
> index 0000000..7ed6ff8
> --- /dev/null
> +++ b/img/app/etc/s6-rc/pipewire/notification-fd
> @@ -0,0 +1 @@
> +5
> diff --git a/img/app/etc/s6-rc/pipewire/run b/img/app/etc/s6-rc/pipewire/run
> new file mode 100644

This needs to be executable.

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