snap: add chvt and the session wrapper

scripts/bin/core-desktop-session-wrapper.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# This script runs outside of snap confinement as a wrapper around the
+# confined desktop session.
+snap_cmd="$1"
+snap_name="$(echo "$snap_cmd" | cut -d . -f 1)"
+
+# Set up PATH and XDG_DATA_DIRS to allow calling snaps
+if [ -f /snap/snapd/current/etc/profile.d/apps-bin-path.sh ]; then
+    source /snap/snapd/current/etc/profile.d/apps-bin-path.sh
+fi
+
+export XDG_CURRENT_DESKTOP=ubuntu:GNOME
+export GSETTINGS_BACKEND=keyfile
+export MOZ_ENABLE_WAYLAND=1
+
+dbus-update-activation-environment --systemd --all
+
+# Don't set this in our own environment, since it will make
+# gnome-session believe it is running in X mode
+dbus-update-activation-environment --systemd WAYLAND_DISPLAY=wayland-0
+
+# Symlink the Wayland socket from the snap's private directory
+ln -sf "snap.$snap_name/wayland-0" $XDG_RUNTIME_DIR/wayland-0
+
+exec "$@"

snap/snapcraft.yaml

@@ -152,6 +152,13 @@ parts:
     prime:
       - -usr/share/fonts/truetype/dejavu
 
+  chvt:
+    plugin: nil
+    stage-packages:
+      - kbd
+    prime:
+      - bin/chvt
+
   graphics-core22:
     after:
       - ubuntu-frame