Add qemu example for running alsa

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

examples/README.md

@@ -56,6 +56,7 @@ Optional feature enablers:
 - [`experimental/net-user-v2`](./experimental/net-user-v2.yaml): [experimental] user-v2 network
   to enable VM-to-VM communication without root privilege
 - [`experimental/vnc`](./experimental/vnc.yaml): [experimental] use vnc display and xorg server
+- [`experimental/alsa`](./experimental/alsa.yaml): [experimental] use alsa and default audio device
 
 Lost+found:
 - ~`centos`~: Removed in Lima v0.8.0, as CentOS 8 reached [EOL](https://www.centos.org/centos-linux-eol/).

examples/experimental/alsa.yaml

@@ -0,0 +1,55 @@
+# A template to run ubuntu using audio: default
+# This template requires Lima v0.23.0 or later.
+images:
+# Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
+- location: "https://cloud-images.ubuntu.com/releases/24.04/release-20240423/ubuntu-24.04-server-cloudimg-amd64.img"
+  arch: "x86_64"
+  digest: "sha256:32a9d30d18803da72f5936cf2b7b9efcb4d0bb63c67933f17e3bdfd1751de3f3"
+- location: "https://cloud-images.ubuntu.com/releases/24.04/release-20240423/ubuntu-24.04-server-cloudimg-arm64.img"
+  arch: "aarch64"
+  digest: "sha256:c841bac00925d3e6892d979798103a867931f255f28fefd9d5e07e3e22d0ef22"
+# Fallback to the latest release image.
+# Hint: run `limactl prune` to invalidate the cache
+- location: "https://cloud-images.ubuntu.com/releases/24.04/release/ubuntu-24.04-server-cloudimg-amd64.img"
+  arch: "x86_64"
+- location: "https://cloud-images.ubuntu.com/releases/24.04/release/ubuntu-24.04-server-cloudimg-arm64.img"
+  arch: "aarch64"
+
+mounts:
+- location: "~"
+- location: "/tmp/lima"
+  writable: true
+
+vmType: "qemu"
+audio:
+  device: "default"
+
+provision:
+- mode: system
+  script: |
+    #!/bin/bash
+    set -eux -o pipefail
+    test -e /lib/modules/$(uname -r)/kernel/sound/pci/hda/snd-hda-intel.ko* && exit 0
+    apt-get install -y linux-modules-extra-$(uname -r)
+    modprobe snd-hda-intel
+- mode: system
+  script: |
+    #!/bin/bash
+    set -eux -o pipefail
+    command -v aplay >/dev/null 2>&1 && exit 0
+    apt-get install -y --no-install-recommends alsa-utils
+probes:
+- description: "alsa to be installed"
+  script: |
+    #!/bin/bash
+    set -eux -o pipefail
+    if ! timeout 30s bash -c "until command -v aplay >/dev/null 2>&1; do sleep 3; done"; then
+      echo >&2 "alsa is not installed yet"
+      exit 1
+    fi
+  hint: See "/var/log/cloud-init-output.log". in the guest
+message: |
+  To get a list of all available audio devices:
+  $ sudo aplay -L
+  To test the audio device, use something like:
+  $ sudo speaker-test -c2 -twav