GNOME extension¶

The GNOME extension, referred to internally as gnome, helps build snaps that use GTK 3 or 4, GNOME 42 and higher, and GLib. This extension provides many of the components needed for general desktop apps, making it useful for a broader set of apps outside of those tailored for the GNOME desktop.

This extension is compatible with the core22, core24, and core26 bases.

Included plugs¶

When this extension is used, the following plugs are connected for the app. The paths and default providers differ between bases.

core26

core24

core22

The extension also connects the following plugs to all apps that use it.

On core22 and core24, the extension also adds the gsettings plug. On core26, apps that need this interface must declare it in their plugs key. The GSettings guidance describes when the plug is needed and how apps store settings without it.

Included packages¶

The GNOME extension is derived from two separate snaps – a build snap and a platform snap.

The build snap compiles libraries from source that are commonly used across GNOME apps. Examples include GLib, GTK, and gnome-desktop. These are built to provide newer versions of these packages that exist in the core22, core24, or core26 base snaps (a subset of their respective Ubuntu archives).

The platform snap takes the build snap and makes all of those libraries available at build time to snaps using this extension. This way, snap authors don’t need to include the pieces of the build snap that are unnecessary at runtime, like compilers, in the final snap.

On core26, the default build snap is gnome-core26-sdk and the platform snap is gnome-core26.

Library cleanup¶

On core26, the extension adds a gnome/cleanup part that runs after the project’s parts. During the prime step, it removes shared libraries from the prime directory that are already supplied by the GNOME content snaps or gtk-common-themes snap. These libraries are provided at runtime by the content snaps instead of being bundled into the project.

If your snap bundles a newer or older version of a library provided by those content snaps, use the provided version instead. Shipping an alternative requires at least a distinct SONAME and corresponding filenames, with your app linked against that library.

This cleanup prevents bundled libraries from overriding the content snap’s libraries. Without it, a content snap update could introduce a dependency on a new symbol that an older bundled library doesn’t provide, causing your app to fail.

Included environment variables¶

In addition to using the build and platform snaps, this extension sets several environment variables, links, and default plugs for the app to use, and a default build-environment for each part in your snap to use.

Build variables¶

The following build environment variables are added to each part in a snap that uses this extension.

You can declare additional variables in the build-environment key. Furthermore, these default variables can be overridden by declaring them in the project file.

The paths differ between bases.

core26

core24

core22

Runtime variables¶

The following environment variables are exported when the app runs:

snapcraft.yaml¶

environment:
  SNAP_DESKTOP_RUNTIME: $SNAP/gnome-platform
  GTK_USE_PORTAL: '1'

Included layouts¶

This extension uses layouts to make certain files from the GNOME platform snap available at well-known locations from the root of the snap filesystem.

core26

core24

core22

Example expanded project file¶

Here’s an example of the result of Snapcraft expanding a project file, as immediately prior to build. It demonstrates the added plugs, packages, variables, and layouts that the GNOME extension includes in a project.

The original files were for the GNOME System Monitor snap. These texts contain the difference between the original file and the output of the snapcraft expand-extensions command. Some of the text has been altered for ease of reading.

core26

Expanded project file for GNOME System Monitor

snapcraft.yaml¶

 name: gnome-system-monitor
 adopt-info: gnome-system-monitor
 summary: System Monitor
 description: |
   GNOME System Monitor is a GNOME process viewer and system monitor with
   an attractive, easy-to-use interface, It has features, such as a tree
   view for process dependencies, icons for processes, the ability to hide
   processes that you don't want to see, graphical time histories of
   CPU/memory/swap usage, the ability to kill/renice processes needing root
   access, as well as the standard features that you might expect from a
   process viewer.

 grade: stable
 confinement: strict
 base: core26

 parts:
   gnome-system-monitor:
     source: https://gitlab.gnome.org/GNOME/gnome-system-monitor.git
     source-type: git
     source-tag: '51.1'
     source-depth: 1
     plugin: meson
-    parse-info: [usr/share/metainfo/gnome-system-monitor.metainfo.xml]
     meson-parameters:
       - --prefix=/usr
       - --buildtype=release
       - -Dsystemd=true
     override-pull: |
       craftctl default
       craftctl set version=$(git describe --tags --abbrev=10)
     build-packages:
       - catch2
       - libgtop2-dev
       - libsigc++-2.0-dev
       - libsystemd-dev
     stage-packages:
       - libsigc++-2.0-0v5
+    build-environment:
+      - SNAPCRAFT_GNOME_SDK: /snap/gnome-core26-sdk/current/
+      - PATH: /snap/gnome-core26-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-core26-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-core26-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-core26-sdk/current/usr/lib:/snap/gnome-core26-sdk/current/usr/lib/vala-current:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-core26-sdk/current/usr/lib/pkgconfig:/snap/gnome-core26-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-core26-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-core26-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-core26-sdk/current/usr/lib/python3.10:/snap/gnome-core26-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-core26-sdk/current/usr/lib/girepository-1.0:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
+      - CMAKE_PREFIX_PATH: $CRAFT_STAGE/usr:/snap/gnome-core26-sdk/current/usr${CMAKE_PREFIX_PATH:+:$CMAKE_PREFIX_PATH}

   libraries:
     after: [gnome-system-monitor]
     plugin: nil
     stage-packages:
       - libgtop-2.0-11
+    build-environment:
+      - SNAPCRAFT_GNOME_SDK: /snap/gnome-core26-sdk/current/
+      - PATH: /snap/gnome-core26-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-core26-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-core26-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-core26-sdk/current/usr/lib:/snap/gnome-core26-sdk/current/usr/lib/vala-current:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-core26-sdk/current/usr/lib/pkgconfig:/snap/gnome-core26-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-core26-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-core26-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-core26-sdk/current/usr/lib/python3.10:/snap/gnome-core26-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-core26-sdk/current/usr/lib/girepository-1.0:/snap/gnome-core26-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
+      - CMAKE_PREFIX_PATH: $CRAFT_STAGE/usr:/snap/gnome-core26-sdk/current/usr${CMAKE_PREFIX_PATH:+:$CMAKE_PREFIX_PATH}
+
+  gnome/gpu/wrapper:
+    source: /snap/snapcraft/x20/share/snapcraft/extensions/gpu/command-chain
+    plugin: make
+    make-parameters:
+    - GPU_INTERFACE=gpu-2604
+
+  gnome/gpu/cleanup:
+    after:
+    - gnome-system-monitor
+    - libraries
+    source: https://github.com/canonical/gpu-snap.git
+    plugin: nil
+    override-prime: |
+      craftctl default
+      ${CRAFT_PART_SRC}/bin/gpu-2604-cleanup mesa-2604
+
+  gnome/sdk:
+    source: /snap/snapcraft/x20/share/snapcraft/extensions/desktop/command-chain
+    plugin: make
+    build-snaps:
+    - gnome-core26-sdk
+
+  gnome/cleanup:
+    after:
+    - gnome-system-monitor
+    - libraries
+    plugin: nil
+    build-snaps:
+    - gnome-core26-sdk
+    - gtk-common-themes
+    override-prime: |
+      set -eux
+      for snap in "gnome-core26-sdk" "gtk-common-themes"; do
+          cd "/snap/$snap/current" && find . -type f,l \( -name "*.so.*" -o -name "*.so" \) -exec rm -f "$CRAFT_PRIME/{}" \;
+      done
+
+layout:
+  /usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkitgtk-6.0:
+    bind: $SNAP/gnome-platform/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkitgtk-6.0
+  /usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.1:
+    bind: $SNAP/gnome-platform/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.1
+  /usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/libproxy:
+    bind: $SNAP/gnome-platform/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/libproxy
+  /usr/share/xml/iso-codes:
+    bind: $SNAP/gnome-platform/usr/share/xml/iso-codes
+  /usr/libexec/glycin-loaders:
+    bind: $SNAP/gnome-platform/usr/libexec/glycin-loaders
+
+assumes:
+- snapd2.43
+
+hooks:
+  configure:
+    command-chain:
+    - snap/command-chain/hooks-configure-fonts
+    plugs:
+    - desktop

 apps:
   gnome-system-monitor:
-    extensions: [ gnome ]
     command: usr/bin/gnome-system-monitor
     plugs:
+      - desktop
+      - desktop-legacy
+      - gsettings
+      - opengl
+      - wayland
+      - x11
       - unity7
       - mount-observe
       - network-observe
       - hardware-observe
       - system-observe
       - process-control
       - run-systemd-sessions
     desktop: usr/share/applications/org.gnome.SystemMonitor.desktop
     common-id: org.gnome.SystemMonitor.desktop
+    command-chain:
+      - snap/command-chain/gpu-2604-wrapper
+      - snap/command-chain/desktop-launch

 plugs:
   run-systemd-sessions:
     interface: system-files
     read:
     - /run/systemd/sessions
+  gpu-2604:
+    interface: content
+    target: $SNAP/gpu-2604
+    default-provider: mesa-2604
+  desktop:
+    mount-host-font-cache: false
+  gtk-3-themes:
+    interface: content
+    target: $SNAP/data-dir/themes
+    default-provider: gtk-common-themes
+  icon-themes:
+    interface: content
+    target: $SNAP/data-dir/icons
+    default-provider: gtk-common-themes
+  sound-themes:
+    interface: content
+    target: $SNAP/data-dir/sounds
+    default-provider: gtk-common-themes
+  gnome-core26:
+    interface: content
+    target: $SNAP/gnome-platform
+    default-provider: gnome-core26

 slots:
   gnome-system-monitor:
   # for GtkApplication registration
     interface: dbus
     bus: session
     name: org.gnome.SystemMonitor
+
+environment:
+  SNAP_DESKTOP_RUNTIME: $SNAP/gnome-platform
+  GTK_USE_PORTAL: '1'

core24

Expanded project file for GNOME System Monitor

snapcraft.yaml¶

 name: gnome-system-monitor
 adopt-info: gnome-system-monitor
 summary: System Monitor
 description: |
   GNOME System Monitor is a GNOME process viewer and system monitor with
   an attractive, easy-to-use interface, It has features, such as a tree
   view for process dependencies, icons for processes, the ability to hide
   processes that you don't want to see, graphical time histories of
   CPU/memory/swap usage, the ability to kill/renice processes needing root
   access, as well as the standard features that you might expect from a
   process viewer.

 grade: stable
 confinement: strict
 base: core24

-build-snaps:
-  - gnome-46-2404/latest/candidate

 parts:
   gnome-system-monitor:
     source: https://gitlab.gnome.org/GNOME/gnome-system-monitor.git
     source-type: git
     source-tag: "46.0"
     source-depth: 1
     plugin: meson
-    parse-info: [usr/share/metainfo/gnome-system-monitor.appdata.xml]
     meson-parameters:
       - --prefix=/snap/gnome-system-monitor/current/usr
       - --buildtype=release
       - -Dsystemd=true
     organize:
       snap/gnome-system-monitor/current/usr: usr
     override-pull: |
       craftctl default
       craftctl set version=$(git describe --tags --abbrev=10)
       sed -i.bak -e 's|Icon=@APP_ID@$|Icon=${SNAP}/meta/gui/org.gnome.SystemMonitor.svg|g'  ./data/org.gnome.SystemMonitor.desktop.in.in
       sed -i.bak -E -e 's|^(NotShowIn=.*)$|# \1|g' ./data/org.gnome.SystemMonitor.desktop.in.in
     override-build: |
       craftctl default
       mkdir -p $CRAFT_PART_INSTALL/meta/gui/
       cp $CRAFT_PART_BUILD/data/org.gnome.SystemMonitor.desktop $CRAFT_PART_INSTALL/meta/gui/
       cp $CRAFT_PART_SRC/data/icons/public/hicolor/scalable/apps/org.gnome.SystemMonitor.svg $CRAFT_PART_INSTALL/meta/gui/
     build-packages:
       - desktop-file-utils
       - docbook-to-man
       - libgtop2-dev
       - libsigc++-2.0-dev
       - libsystemd-dev
       - policykit-1
       - yelp-tools
     stage-packages:
       - libsigc++-2.0-0v5
     build-snaps:
       - gnome-46-2404-sdk/latest/candidate

+    build-environment:
+      - PATH: /snap/gnome-46-2404-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-46-2404-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-46-2404-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib:/snap/gnome-46-2404-sdk/current/usr/lib/vala-current:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/lib/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-46-2404-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-46-2404-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-46-2404-sdk/current/usr/lib/python3.10:/snap/gnome-46-2404-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/girepository-1.0:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
   libraries:
     after:
       - gnome-system-monitor
     plugin: nil
     stage-packages:
       - libgtop-2.0-11
     prime:
   # Find files provided by the base and platform snap and ensure they aren't
   # duplicated in this snap
       - usr/lib/*/libgtop*
       - usr/lib/*/libsigc-2.0.so.0*
+    build-environment:
+      - PATH: /snap/gnome-46-2404-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-46-2404-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-46-2404-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib:/snap/gnome-46-2404-sdk/current/usr/lib/vala-current:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/lib/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-46-2404-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-46-2404-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-46-2404-sdk/current/usr/lib/python3.10:/snap/gnome-46-2404-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/girepository-1.0:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
   cleanup:
     after:
       - libraries
     plugin: nil
     build-snaps:
       - core24
       - gnome-46-2404
     override-prime: |
       set -eux
       for snap in "core24" "gnome-46-2404"; do
         cd "/snap/$snap/current" && find . -type f,l -exec rm -f "$CRAFT_PRIME/{}" \;
       done
+    build-environment:
+      - PATH: /snap/gnome-46-2404-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-46-2404-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-46-2404-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib:/snap/gnome-46-2404-sdk/current/usr/lib/vala-current:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/lib/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-46-2404-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-46-2404-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-46-2404-sdk/current/usr/lib/python3.10:/snap/gnome-46-2404-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/girepository-1.0:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
+  snapcraft/core:
+    build-snaps:
+      - gnome-46-2404/latest/candidate
+    plugin: nil
+    build-environment:
+      - PATH: /snap/gnome-46-2404-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-46-2404-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-46-2404-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-46-2404-sdk/current/usr/lib:/snap/gnome-46-2404-sdk/current/usr/lib/vala-current:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/lib/pkgconfig:/snap/gnome-46-2404-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-46-2404-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-46-2404-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-46-2404-sdk/current/usr/lib/python3.10:/snap/gnome-46-2404-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-46-2404-sdk/current/usr/lib/girepository-1.0:/snap/gnome-46-2404-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
+  gnome/gpu/wrapper:
+    source: /snap/snapcraft/13181/share/snapcraft/extensions/gpu/command-chain
+    plugin: make
+    make-parameters:
+      - GPU_INTERFACE=gpu-2404
+  gnome/sdk:
+    source: /snap/snapcraft/13181/share/snapcraft/extensions/desktop/command-chain
+    plugin: make
+
+layout:
+  /usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.1:
+    bind: $SNAP/gnome-platform/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.1
+  /usr/share/xml/iso-codes:
+    bind: $SNAP/gnome-platform/usr/share/xml/iso-codes
+  /usr/share/libdrm:
+    bind: $SNAP/gpu-2404/libdrm
+  /usr/share/drirc.d:
+    symlink: $SNAP/gpu-2404/drirc.d
+  /usr/share/X11/XErrorDB:
+    symlink: $SNAP/gpu-2404/X11/XErrorDB
+assumes:
+  - snapd2.43
+hooks:
+  configure:
+    command-chain:
+      - snap/command-chain/hooks-configure-fonts
+    plugs:
+      - desktop

 apps:
   gnome-system-monitor:
-    extensions: [ gnome ]
     command: usr/bin/gnome-system-monitor
     desktop: usr/share/applications/org.gnome.SystemMonitor.desktop
     plugs:
+      - desktop
+      - desktop-legacy
+      - gsettings
+      - opengl
+      - wayland
+      - x11
       - unity7
       - mount-observe
       - network-observe
       - hardware-observe
       - system-observe
       - process-control
       - run-systemd-sessions
+    command-chain:
+      - snap/command-chain/gpu-2404-wrapper
+      - snap/command-chain/desktop-launch

 plugs:
   run-systemd-sessions:
     interface: system-files
     read:
       - /run/systemd/sessions
+  desktop:
+    mount-host-font-cache: false
+  gtk-3-themes:
+    interface: content
+    target: $SNAP/data-dir/themes
+    default-provider: gtk-common-themes
+  icon-themes:
+    interface: content
+    target: $SNAP/data-dir/icons
+    default-provider: gtk-common-themes
+  sound-themes:
+    interface: content
+    target: $SNAP/data-dir/sounds
+    default-provider: gtk-common-themes
+  gnome-46-2404:
+    interface: content
+    target: $SNAP/gnome-platform
+    default-provider: gnome-46-2404
+  gpu-2404:
+    interface: content
+    target: $SNAP/gpu-2404
+    default-provider: mesa-2404

 slots:
   gnome-system-monitor:
   # for GtkApplication registration
     interface: dbus
     bus: session
     name: org.gnome.SystemMonitor

+environment:
+  SNAP_DESKTOP_RUNTIME: $SNAP/gnome-platform
+  GTK_USE_PORTAL: "1"

core22

Expanded project file for GNOME System Monitor

snapcraft.yaml¶

 summary: System Monitor
 description: |
   GNOME System Monitor is a GNOME process viewer and system monitor with
   an attractive, easy-to-use interface, It has features, such as a tree
   view for process dependencies, icons for processes, the ability to hide
   processes that you don't want to see, graphical time histories of
   CPU/memory/swap usage, the ability to kill/renice processes needing root
   access, as well as the standard features that you might expect from a
   process viewer.

 grade: stable
 confinement: strict
 base: core22

-build-snaps:
-  - gnome-42-2204/latest/candidate

 slots:
   # for GtkApplication registration
   gnome-system-monitor:
     interface: dbus
     bus: session
     name: org.gnome.SystemMonitor

 parts:
   gnome-system-monitor:
     # ext:updatesnap
     source: https://gitlab.gnome.org/GNOME/gnome-system-monitor.git
     source-type: git
     source-tag: "46.0"
     source-depth: 1
     plugin: meson
-    parse-info: [usr/share/metainfo/gnome-system-monitor.appdata.xml]
     meson-parameters:
       - --prefix=/snap/gnome-system-monitor/current/usr
       - --buildtype=release
       - -Dsystemd=true
     organize:
       snap/gnome-system-monitor/current/usr: usr
     override-pull: |
       craftctl default
       craftctl set version=$(git describe --tags --abbrev=10)
       sed -i.bak -e 's|Icon=org.gnome.SystemMonitor$|Icon=${SNAP}/meta/gui/org.gnome.SystemMonitor.svg|g' gnome-system-monitor.desktop.in
       sed -i.bak -E -e 's|^(NotShowIn=.*)$|# \1|g' gnome-system-monitor.desktop.in
     override-build: |
       craftctl default
       mkdir -p $CRAFT_PART_INSTALL/meta/gui/
       cp $CRAFT_PART_BUILD/gnome-system-monitor.desktop $CRAFT_PART_INSTALL/meta/gui/
       cp $CRAFT_PART_SRC/data/icons/public/hicolor/scalable/apps/org.gnome.SystemMonitor.svg $CRAFT_PART_INSTALL/meta/gui/
     build-packages:
       - desktop-file-utils
       - docbook-to-man
       - libgtop2-dev
       - libsigc++-2.0-dev
       - libsystemd-dev
       - policykit-1
       - yelp-tools
     stage-packages:
       - libsigc++-2.0-0v5
+    build-environment:
+      - PATH: /snap/gnome-42-2204-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-42-2204-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-42-2204-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib:/snap/gnome-42-2204-sdk/current/usr/lib/vala-current:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/lib/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-42-2204-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-42-2204-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-42-2204-sdk/current/usr/lib/python3.10:/snap/gnome-42-2204-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/girepository-1.0:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
   libraries:
     after:
       - gnome-system-monitor
     plugin: nil
     stage-packages:
       - libgtop-2.0-11
     prime:
     # Find files provided by the base and platform snap and ensure they aren't
     # duplicated in this snap
       - usr/lib/*/libgtop*
       - usr/lib/*/libsigc-2.0.so.0*
+    build-environment:
+      - PATH: /snap/gnome-42-2204-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-42-2204-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-42-2204-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib:/snap/gnome-42-2204-sdk/current/usr/lib/vala-current:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/lib/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-42-2204-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-42-2204-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-42-2204-sdk/current/usr/lib/python3.10:/snap/gnome-42-2204-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/girepository-1.0:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
   cleanup:
     after:
       - libraries
     plugin: nil
     build-snaps:
       - core22
       - gnome-42-2204
     override-prime: |
       set -eux
       for snap in "core22" "gnome-42-2204"; do
         cd "/snap/$snap/current" && find . -type f,l -exec rm -f "$CRAFT_PRIME/{}" \;
       done
+    build-environment:
+      - PATH: /snap/gnome-42-2204-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-42-2204-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-42-2204-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib:/snap/gnome-42-2204-sdk/current/usr/lib/vala-current:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/lib/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-42-2204-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-42-2204-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-42-2204-sdk/current/usr/lib/python3.10:/snap/gnome-42-2204-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/girepository-1.0:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
+  snapcraft/core:
+    build-snaps:
+      - gnome-42-2204/latest/candidate
+    plugin: nil
+    build-environment:
+      - PATH: /snap/gnome-42-2204-sdk/current/usr/bin${PATH:+:$PATH}
+      - XDG_DATA_DIRS: $CRAFT_STAGE/usr/share:/snap/gnome-42-2204-sdk/current/usr/share:/usr/share${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}
+      - LD_LIBRARY_PATH: /snap/gnome-42-2204-sdk/current/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR:/snap/gnome-42-2204-sdk/current/usr/lib:/snap/gnome-42-2204-sdk/current/usr/lib/vala-current:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pulseaudio${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+      - PKG_CONFIG_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/lib/pkgconfig:/snap/gnome-42-2204-sdk/current/usr/share/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}
+      - GETTEXTDATADIRS: /snap/gnome-42-2204-sdk/current/usr/share/gettext-current${GETTEXTDATADIRS:+:$GETTEXTDATADIRS}
+      - GDK_PIXBUF_MODULE_FILE: /snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gdk-pixbuf-current/loaders.cache
+      - ACLOCAL_PATH: /snap/gnome-42-2204-sdk/current/usr/share/aclocal${ACLOCAL_PATH:+:$ACLOCAL_PATH}
+      - PYTHONPATH: /snap/gnome-42-2204-sdk/current/usr/lib/python3.10:/snap/gnome-42-2204-sdk/current/usr/lib/python3/dist-packages:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/gobject-introspection${PYTHONPATH:+:$PYTHONPATH}
+      - GI_TYPELIB_PATH: /snap/gnome-42-2204-sdk/current/usr/lib/girepository-1.0:/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/girepository-1.0${GI_TYPELIB_PATH:+:$GI_TYPELIB_PATH}
+  gnome/sdk:
+    source: /snap/snapcraft/13181/share/snapcraft/extensions/desktop/command-chain
+    plugin: make
+    build-snaps:
+      - gnome-42-2204-sdk

+layout:
+  /usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.0:
+    bind: $SNAP/gnome-platform/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.0
+  /usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.1:
+    bind: $SNAP/gnome-platform/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR/webkit2gtk-4.1
+  /usr/share/xml/iso-codes:
+    bind: $SNAP/gnome-platform/usr/share/xml/iso-codes
+  /usr/share/libdrm:
+    bind: $SNAP/gnome-platform/usr/share/libdrm

+architectures:
+  - build-on:
+      - amd64
+    build-for:
+      - amd64
+assumes:
+  - snapd2.43
+hooks:
+  configure:
+    command-chain:
+      - snap/command-chain/hooks-configure-fonts
+    plugs:
+      - desktop

 apps:
   gnome-system-monitor:
-  extensions:
-    - gnome
     command: usr/bin/gnome-system-monitor
     common-id: gnome-system-monitor.desktop
     desktop: usr/share/applications/gnome-system-monitor.desktop
+    plugs:
+      - desktop
+      - desktop-legacy
+      - gsettings
+      - opengl
+      - wayland
+      - x11
       - unity7
       - mount-observe
       - network-observe
       - hardware-observe
       - system-observe
       - process-control
       - run-systemd-sessions
+    command-chain:
+      - snap/command-chain/desktop-launch

 plugs:
   run-systemd-sessions:
     interface: system-files
     read:
       - /run/systemd/sessions
+  desktop:
+    mount-host-font-cache: false
+  gtk-3-themes:
+    interface: content
+    target: $SNAP/data-dir/themes
+    default-provider: gtk-common-themes
+  icon-themes:
+    interface: content
+    target: $SNAP/data-dir/icons
+    default-provider: gtk-common-themes
+  sound-themes:
+    interface: content
+    target: $SNAP/data-dir/sounds
+    default-provider: gtk-common-themes
+  gnome-42-2204:
+    interface: content
+    target: $SNAP/gnome-platform
+    default-provider: gnome-42-2204

+environment:
+  SNAP_DESKTOP_RUNTIME: $SNAP/gnome-platform
+  GTK_USE_PORTAL: "1"