Build: checkout assets directory automatically

This changes `make update` to download the assets repository automatically
if it does not exist already. If it does exist, it is updated. Precompiled libraries
have the same behavior. This is required for T103620.

`pipeline_config.yaml` is updated as well for the builtbot.

Differential Revision: https://developer.blender.org/D17090

build_files/config/pipeline_config.yaml

@@ -43,6 +43,10 @@ update-code:
             branch: trunk
             commit_id: HEAD
             path: lib/benchmarks
+        assets:
+            branch: trunk
+            commit_id: HEAD
+            path: lib/assets
 
 #
 # Buildbot only configs

build_files/utils/make_update.py

@@ -104,17 +104,30 @@ def svn_update(args: argparse.Namespace, release_version: Optional[str]) -> None
             svn_url_tests = svn_url + lib_tests
             call(svn_non_interactive + ["checkout", svn_url_tests, lib_tests_dirpath])
 
-    # Update precompiled libraries and tests
+    lib_assets = "assets"
+    lib_assets_dirpath = os.path.join(lib_dirpath, lib_assets)
+
+    if not os.path.exists(lib_assets_dirpath):
+        print_stage("Checking out Assets")
+
+        if make_utils.command_missing(args.svn_command):
+            sys.stderr.write("svn not found, can't checkout assets\n")
+            sys.exit(1)
+
+        svn_url_assets = svn_url + lib_assets
+        call(svn_non_interactive + ["checkout", svn_url_assets, lib_assets_dirpath])
+
+    # Update precompiled libraries, assets and tests
 
     if not os.path.isdir(lib_dirpath):
         print("Library path: %r, not found, skipping" % lib_dirpath)
     else:
         paths_local_and_remote = []
         if os.path.exists(os.path.join(lib_dirpath, ".svn")):
-            print_stage("Updating Precompiled Libraries and Tests (one repository)")
+            print_stage("Updating Precompiled Libraries, Assets and Tests (one repository)")
             paths_local_and_remote.append((lib_dirpath, svn_url))
         else:
-            print_stage("Updating Precompiled Libraries and Tests (multiple repositories)")
+            print_stage("Updating Precompiled Libraries, Assets and Tests (multiple repositories)")
             # Separate paths checked out.
             for dirname in os.listdir(lib_dirpath):
                 if dirname.startswith("."):