Rebase Ubuntu Core Desktop changes on top of core24:

* Add a Github Actions workflow to test build the snap.
* Configure snap settings defaults via gadget.yaml.
* Configure some interface connects for ubuntu-desktop-session via
  gadget.yaml.
* Turn on the graphical boot splash screen.
* Add a cloud-init script to do some first-boot config for the
  network-manager and lxd snaps.

Co-authored-by: Ken VanDine <ken.vandine@canonical.com>
Co-authored-by: Robert Ancell <robert.ancell@canonical.com>
Co-authored-by: Sergio Costas Rodriguez <sergio.costas@canonical.com>

.github/workflows/build-snap.yml

@@ -0,0 +1,23 @@
+name: build-snap
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - 22
+      - 24
+
+jobs:
+  snap:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: snapcore/action-build@v1
+      id: snapcraft
+      with:
+        # Switch back to stable once https://github.com/canonical/snapcraft/pull/4850 is released.
+        snapcraft-channel: edge
+    - uses: actions/upload-artifact@v4
+      with:
+        name: 'snap'
+        path: ${{ steps.snapcraft.outputs.snap}}

extra/cloud.conf

@@ -0,0 +1,4 @@
+#cloud-config
+datasource_list: [NoCloud]
+runcmd:
+  - /snap/pc-desktop/current/extra-setup.sh

extra/cmdline.extra

@@ -0,0 +1 @@
+quiet splash

extra/extra-setup.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if [ -d /var/snap/network-manager/current/ ]; then
+    mkdir -p /var/snap/network-manager/current/conf.d
+    cat > /var/snap/network-manager/current/conf.d/disable-polkit.conf <<EOF
+[main]
+auth-polkit=false
+EOF
+fi
+
+if [ -x /snap/bin/lxd ]; then
+    #initalize lxd with zfs storage backend for sudo support
+    /snap/bin/lxd init --storage-backend zfs --auto
+fi

gadget/gadget-amd64.yaml

@@ -27,7 +27,7 @@ volumes:
         # UEFI will boot the ESP partition by default first
         type: C12A7328-F81F-11D2-BA4B-00A0C93EC93B
         # Size of around two seeds to allow for remodeling
-        size: 1200M
+        size: 7000M
         update:
           edition: 2
         content:
@@ -59,3 +59,44 @@ volumes:
         filesystem: ext4
         type: 0FC63DAF-8483-4772-8E79-3D69D8477DE4
         size: 1G
+
+defaults:
+  system:
+    experimental.user-daemons: true
+    experimental.dbus-activation: true
+    refresh.retain: 2
+    service.ssh.listen-address: 127.0.0.1
+    swap.size: 4G
+
+# Connect ubuntu-desktop-session
+connections:
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:account-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:avahi-control
+    slot: dVK2PZeOLKA7vf1WPCap9F8luxTk9Oll:avahi-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:desktop-launch
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:hardware-observe
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:home
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:hostname-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:locale-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:login-session-observe
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:login-session-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:mount-observe
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:network-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:network-observe
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:polkit-agent
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:process-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:shutdown
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:system-observe
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:shell-config-files
+    slot: system:system-files
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:time-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:timeserver-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:timezone-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:upower-observe
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:network-manager
+    slot: RmBXKl6HO6YOC2DE4G2q1JzWImC04EUy:service
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:bluez
+    slot: JmzJi9kQvHUWddZ32PDJpBRXUpGRxvNS:service
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:bluetooth-control
+  - plug: LVkazk0JLrL0ivuHRlv3wp3bK1nAgwtN:cups-control
+    slot: m1eQacDdXCthEwWQrESei3Zao3d5gfJF:cups-control

snapcraft.yaml

@@ -1,12 +1,15 @@
-name: pc
+name: pc-desktop
 version: '24-0.1'
 type: gadget
-base: core24
+build-base: core24
+base: core24-desktop
 summary: PC gadget for generic devices
 description: |
-    This gadget enables generic pc devices to work with Ubuntu Core
+    This gadget enables generic pc devices to work with Ubuntu Core Desktop
 confinement: strict
 grade: stable
+platforms:
+  amd64:
 icon: icon.png
 
 #package-repositories:
@@ -86,3 +89,6 @@ parts:
       # We need to install directly in the project dir as snapcraft checks there
       # for gadget.yaml instead of looking first at the prime folder.
       install -m 644 gadget-"${CRAFT_ARCH_BUILD_FOR}".yaml "${CRAFT_PROJECT_DIR}"/gadget.yaml
+  extra:
+    source: ./extra
+    plugin: dump