Added recipes for some Linux system libraries.

addons/gitbranch.py

@@ -21,19 +21,26 @@ def _clone(env: Environment, repo_name: str, remote_url: str):
 def _git_branch(env: Environment, repo_name: str, remote_url: str, git_ref: str = 'main') -> dict:
     repo, origin = _clone(env, repo_name, remote_url)
     worktree_dir = os.path.join(env['CLONE_DIR'], 'git', repo_name, hashlib.shake_128(git_ref.encode('utf-8')).hexdigest(6)) # TODO: commit hash would be better, right? -> not if it's a branch!
+    update_submodules = False
     if not os.path.exists(worktree_dir):
         print(f'Checking out into {worktree_dir}.')
         origin.fetch(tags=True, force=True)
         os.makedirs(worktree_dir)
         repo.git.worktree('add', worktree_dir, git_ref)
+        worktree_repo = Repo(worktree_dir)
+        update_submodules = True
     elif env['UPDATE_REPOSITORIES']:
         worktree_repo = Repo(worktree_dir)
         if not worktree_repo.head.is_detached:
             print(f'Updating git repository at {worktree_dir}')
             worktree_origin = worktree_repo.remotes['origin']
             worktree_origin.pull()
+            update_submodules = True
         else:
             print(f'Not updating git repository {worktree_dir} as it is not on a branch.')
+    if update_submodules:
+        for submodule in worktree_repo.submodules:
+            submodule.update(init=True)
     return {
         'checkout_root': worktree_dir,
         'repo': repo,