feat: expose host apps in the cpak session

Author: mirkobrombin

cpak.json

@@ -39,7 +39,17 @@
     "deviceAll": false,
     "notification": false,
     "openURI": false,
-    "filesystem": [],
+    "hostApplications": true,
+    "filesystem": [
+      { "path": "xdg-desktop", "access": "read-write" },
+      { "path": "xdg-documents", "access": "read-write" },
+      { "path": "xdg-download", "access": "read-write" },
+      { "path": "xdg-music", "access": "read-write" },
+      { "path": "xdg-pictures", "access": "read-write" },
+      { "path": "xdg-public-share", "access": "read-write" },
+      { "path": "xdg-templates", "access": "read-write" },
+      { "path": "xdg-videos", "access": "read-write" }
+    ],
     "env": [
       "PATH=/opt/singularity/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
       "LD_LIBRARY_PATH=/opt/singularity/lib",

cpak/singularity-cpak-session

@@ -19,4 +19,14 @@ if [ -z "$owner" ] || ! kill -0 "$owner" 2>/dev/null; then
     chmod 0444 "$lock"
 fi
 
+if [ -n "${CPAK_DESKTOP_RUNTIME:-}" ]; then
+    outer_wayland="${WAYLAND_DISPLAY:-wayland-0}"
+    case "$outer_wayland" in
+        /*) ;;
+        *) outer_wayland="${XDG_RUNTIME_DIR}/${outer_wayland}" ;;
+    esac
+    export XDG_RUNTIME_DIR="$CPAK_DESKTOP_RUNTIME"
+    export WAYLAND_DISPLAY="$outer_wayland"
+fi
+
 exec /opt/singularity/bin/singularity-labwc-session "$@"