chore(migration): Migrate code from googleapis/python-pubsub into packages/google-cloud-pubsub

packages/google-cloud-pubsub/.coveragerc

@@ -0,0 +1,14 @@
+[run]
+branch = True
+
+[report]
+show_missing = True
+omit =
+    google/cloud/__init__.py
+    google/pubsub/__init__.py
+    google/pubsub/gapic_version.py
+exclude_lines =
+    # Re-enable the standard pragma
+    pragma: NO COVER
+    # Ignore debug-only repr
+    def __repr__

packages/google-cloud-pubsub/.flake8

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+[flake8]
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2333):
+# Resolve flake8 lint issues
+ignore = E203, E231, E266, E501, W503
+exclude =
+  # TODO(https://github.com/googleapis/gapic-generator-python/issues/2333):
+  # Ensure that generated code passes flake8 lint
+  **/gapic/**
+  **/services/**
+  **/types/**
+  # Exclude Protobuf gencode
+  *_pb2.py
+
+  # Standard linting exemptions.
+  **/.nox/**
+  __pycache__,
+  .git,
+  *.pyc,
+  conf.py

packages/google-cloud-pubsub/.gitignore

@@ -0,0 +1,64 @@
+*.py[cod]
+*.sw[op]
+
+# C extensions
+*.so
+
+# Packages
+*.egg
+*.egg-info
+dist
+build
+eggs
+.eggs
+parts
+bin
+var
+sdist
+develop-eggs
+.installed.cfg
+lib
+lib64
+__pycache__
+
+# Installer logs
+pip-log.txt
+
+# Unit test / coverage reports
+.coverage
+.nox
+.cache
+.pytest_cache
+
+
+# Mac
+.DS_Store
+
+# JetBrains
+.idea
+
+# VS Code
+.vscode
+
+# emacs
+*~
+
+# Built documentation
+docs/_build
+bigquery/docs/generated
+docs.metadata
+
+# Virtual environment
+env/
+venv/
+
+# Test logs
+coverage.xml
+*sponge_log.xml
+
+# System test environment variables.
+system_tests/local_test_setup
+
+# Make sure a generated file isn't accidentally committed.
+pylintrc
+pylintrc.test

packages/google-cloud-pubsub/.librarian/config.yaml

@@ -0,0 +1,6 @@
+global_files_allowlist:
+  # Allow the container to read and write the root `CHANGELOG.md`
+  # file during the `release` step to update the latest client library
+  # versions which are hardcoded in the file.
+  - path: "CHANGELOG.md"
+    permissions: "read-write"

packages/google-cloud-pubsub/.librarian/generator-input/.repo-metadata.json

@@ -0,0 +1,18 @@
+{
+    "name": "pubsub",
+    "name_pretty": "Google Cloud Pub/Sub",
+    "product_documentation": "https://cloud.google.com/pubsub/docs/",
+    "client_documentation": "https://cloud.google.com/python/docs/reference/pubsub/latest",
+    "issue_tracker": "https://issuetracker.google.com/savedsearches/559741",
+    "release_level": "stable",
+    "language": "python",
+    "repo": "googleapis/python-pubsub",
+    "distribution_name": "google-cloud-pubsub",
+    "api_id": "pubsub.googleapis.com",
+    "requires_billing": true,
+    "default_version": "v1",
+    "codeowner_team": "@googleapis/api-pubsub",
+    "api_shortname": "pubsub",
+    "library_type": "GAPIC_COMBO",
+    "api_description": "is designed to provide reliable, many-to-many, asynchronous messaging between applications. Publisher applications can send messages to a topic and other applications can subscribe to that topic to receive the messages. By decoupling senders and receivers, Google Cloud Pub/Sub allows developers to communicate between independently written applications."
+}