app_containers: Add automatic shortcut generation

We don't use the .nspawn files because they live in /etc...

app_containers/.local/bin/generate_shortcut_container_app

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+die() {
+  echo "$1" >&2
+  exit 1
+}
+
+container_name="$1"
+[ -z "container_name" ] && die "Please provide name of container"
+container_root=/var/lib/machines/$container_name
+
+app_name="$2"
+[ -z "$app_name" ] && die "Please provide name of app"
+
+desktop_file=$container_root/usr/share/applications/$app_name.desktop
+desktop_file_content=$(sudo cat $desktop_file 2>/dev/null)
+[ $? == 0 ] || die "App $app_name not found in container $container_name"
+
+icon_name=$(echo "$desktop_file_content" | grep "Icon=" | head -1 | cut -d'=' -f 2)
+[ -z "$icon_name" ] && die "No icon defined for app $app_name"
+
+icon_root=$container_root/usr/share/icons/hicolor
+icons=($(sudo find $icon_root -name "$icon_name.*"))
+[ ${#icons[@]} == 0 ] && die "Cannot find any icon for app $app_name"
+
+for icon in ${icons[@]}; do
+  icon_target=${icon//$icon_root/$HOME/.local/share/icons/hicolor}
+  icon_target_dir=$(dirname "$icon_target")
+  echo "Copying $icon to $icon_target in $icon_target_dir"
+  mkdir -p "$icon_target_dir"
+  sudo cat "$icon" > "$icon_target"
+done
+
+mkdir -p $HOME/.local/share/applications
+echo "$desktop_file_content" | sed -r "s@^Exec=(.*)\$@Exec=env CONTAINER_NAME=$container_name $HOME/.local/bin/run_app_container \\1@g" > $HOME/.local/share/applications/$app_name.desktop
+echo "Created $HOME/.local/share/applications/$app_name.desktop"

app_containers/.local/bin/run_app_container

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+
+die() {
+  echo "$1" >&2
+  exit 1
+}
+
+[ -z "$CONTAINER_NAME" ] && die "\$CONTAINER_NAME not set"
+[ -z "$DISPLAY" ] && die "\$DISPLAY not set (you must run the script in a desktop environment"
+
+# Source configuration files if any
+config="$HOME/.config/app_containers/$CONTAINER_NAME.sh"
+if [ -f "$config" ]; then
+  source "$config"
+fi
+
+# Create a XDG_RUNTIME_DIR for guest on host
+container_xdg_runtime="$(mktemp -d)"
+trap 'rm -rf -- "$container_xdg_runtime"' EXIT
+
+# Link the current wayland session to the container's xdg runtime
+# Note that the session itself must be bind-mounted first
+ln -s /run/host/$WAYLAND_DISPLAY $container_xdg_runtime/$WAYLAND_DISPLAY
+
+# From <https://liolok.com/run-desktop-app-with-systemd-nspawn-container>
+if [[ -n $DBUS_SESSION_BUS_ADDRESS ]]; then # remove prefix
+    host_bus=${DBUS_SESSION_BUS_ADDRESS#unix:path=}
+else # default guess
+    host_bus=$XDG_RUNTIME_DIR/bus
+fi
+
+if [[ -n $PULSE_SERVER ]]; then # remove prefix
+  host_pulse=${PULSE_SERVER#unix:}
+else # default guess
+  host_pulse=$XDG_RUNTIME_DIR/pulse
+fi
+
+# Default username (assume `user` always has the same uid as the host user)
+run_as=user
+homedir=/home/user
+if [ "$CONTAINER_RUN_AS_ROOT" = true ]; then
+  run_as=root
+  homedir=/root
+fi
+
+SUDO_ASKPASS=$HOME/.local/bin/askpass-bemenu sudo -A systemd-nspawn -M $CONTAINER_NAME \
+    `# DNS (when containers do not have their own netns)` \
+    --bind-ro=/run/systemd/resolve/stub-resolv.conf:/etc/resolv.conf \
+    `# GPU` \
+    --bind=/dev/dri \
+    --bind=/dev/shm \
+    --property=DeviceAllow='/dev/dri rw' \
+    --property=DeviceAllow='/dev/shm rw' \
+    `# Input devices` \
+    --bind-ro=/dev/input \
+    --property=DeviceAllow='char-input r' \
+    `# Xdg runtime` \
+    --bind=$container_xdg_runtime:/run/xdg \
+    --setenv=XDG_RUNTIME_DIR=/run/xdg \
+    `# Xorg / Xwayland` \
+    --bind-ro=/tmp/.X11-unix \
+    --setenv=DISPLAY=$DISPLAY \
+    `# Wayland (note the symlink created before in xdg runtime)` \
+    --bind-ro=$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY:/run/host/$WAYLAND_DISPLAY \
+    --setenv=WAYLAND_DISPLAY=$WAYLAND_DISPLAY \
+    `# PulseAudio` \
+    --bind-ro=$host_pulse:/run/host/pulse \
+    --setenv=PULSE_SERVER=unix:/run/host/pulse/native \
+    `# DBus` \
+    --bind-ro=$host_bus:/run/host/bus \
+    --setenv=DBUS_SESSION_BUS_ADDRESS=unix:path=/run/host/bus \
+    `# Scaling `\
+    --setenv=GDK_SCALE="$GDK_SCALE" \
+    `# Extra params` \
+    $SYSTEMD_NSPAWN_EXTRA_ARGS \
+    `# Launch app` \
+    --user=$run_as --chdir=$homedir --as-pid2 $@ 

utils/.local/bin/askpass-bemenu

@@ -0,0 +1,7 @@
+#!/bin/sh
+/usr/bin/bemenu \
+    --prompt "$1" \
+    --password \
+    --no-exec \
+    </dev/null
+# must close stdin, otherwise bemenu hangs