Linux: add script and instructions for creating snap packages

We will now maintain the Blender package on snapcraft.io/blender.

Differential Revision: https://developer.blender.org/D5342

release/freedesktop/snap/README.txt

@@ -0,0 +1,38 @@
+
+Snap Package Instructions
+=========================
+
+This folder contains the scripts for creating and uploading the snap on:
+https://snapcraft.io/blender
+
+
+Setup
+-----
+
+This has only been tested to work on Ubuntu.
+
+# Install required packages
+sudo apt install snapd snapcraft
+
+
+Steps
+-----
+
+# Build the snap file
+python3 bundle.py --version 2.XX --url https://download.blender.org/release/Blender2.XX/blender-2.XX-x86_64.tar.bz2
+
+# Install snap to test
+# --dangerous is needed since the snap has not been signed yet
+# --classic is required for installing Blender in general
+sudo snap install --dangerous --classic blender_2.XX_amd64.snap
+
+# Upload
+snapcraft push --release=stable blender_2.XX_amd64.snap
+
+
+Release Values
+--------------
+
+stable: final release
+candidate: release candidates
+

release/freedesktop/snap/bundle.py

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+#!/usr/bin/env python3
+
+import argparse
+import os
+import pathlib
+import subprocess
+
+parser = argparse.ArgumentParser()
+parser.add_argument("--version", required=True)
+parser.add_argument("--url", required=True)
+parser.add_argument("--grade", default="stable", choices=["stable", "devel"])
+args = parser.parse_args()
+
+yaml_text = pathlib.Path("snapcraft.yaml.in").read_text()
+yaml_text = yaml_text.replace("@VERSION@", args.version)
+yaml_text = yaml_text.replace("@URL@", args.url)
+yaml_text = yaml_text.replace("@GRADE@", args.grade)
+pathlib.Path("snapcraft.yaml").write_text(yaml_text)
+
+subprocess.call(["snapcraft", "clean"])
+subprocess.call(["snapcraft", "snap"])

release/freedesktop/snap/snapcraft.yaml.in

@@ -0,0 +1,48 @@
+name: blender
+summary: Blender is the free and open source 3D creation suite.
+description: |
+    Blender is the free and open source 3D creation suite. It supports the
+    entirety of the 3D pipeline—modeling, rigging, animation, simulation,
+    rendering, compositing and motion tracking, and video editing.
+
+    Blender is a public project, made by hundreds of people from around the
+    world; by studios and individual artists, professionals and hobbyists,
+    scientists, students, VFX experts, animators, game artists, modders, and
+    the list goes on.
+
+    The standard snap channels are used in the following way:
+
+           stable - Latest stable release.
+        candidate - Test builds for the upcoming stable release.
+
+icon: ../icons/scalable/apps/blender.svg
+
+passthrough:
+    license: GPL-3.0
+
+confinement: classic
+
+apps:
+    blender:
+        command: ./blender
+        desktop: ./blender.desktop
+
+version: @VERSION@
+grade: @GRADE@
+
+parts:
+    blender:
+        plugin: dump
+        source: @URL@
+        build-attributes: [keep-execstack, no-patchelf]
+        override-build: |
+            snapcraftctl build
+            sed -i 's|Icon=blender|Icon=${SNAP}/blender.svg|' ${SNAPCRAFT_PART_INSTALL}/blender.desktop
+        stage-packages:
+            - libxcb1
+            - libxext6
+            - libx11-6
+            - libxi6
+            - libxfixes3
+            - libxrender1
+            - libxxf86vm1