chore(java): add a note in README for migrated split repos (#1687)

* chore(java): add a note in README for migrated split repos

Disable renovate bot and flaky bot for split repositories
that have moved to the Java monorepo.
The Java monorepo will pass the "monorepo=True" parameter
to java.common_templates method in its owlbot.py files so that
the migration note will not appear in the README in the monorepo.

Co-authored-by: Jeff Ching <chingor@google.com>

docker/owlbot/java/README.md

@@ -19,6 +19,38 @@ docker run --rm -v $(pwd):/workspace --user "$(id -u):$(id -g)" gcr.io/repo-auto
 
 ### Building the image
 
+#### Local Docker
+
+From the root of the synthtool repository, run:
+
+```bash
+synthtool$ docker build -f docker/owlbot/java/Dockerfile .
+...
+Removing intermediate container e6d071e39d1b
+ ---> a7d7e0c80b00
+Successfully built a7d7e0c80b00
+```
+
+"a7d7e0c80b00" is the ID of the container image build. Try running the
+postprocessor image with a target repository.
+Here is an example with java-aiplatform repository  below:
+
+```bash
+java-aiplatform$ git checkout -b test_postprocessor origin/main
+branch 'test_postprocessor' set up to track 'origin/main'.
+Switched to a new branch 'test_postprocessor'
+java-aiplatform$ docker run --rm -v $(pwd):/workspace a7d7e0c80b00
+...
+Reformatting source...
+...done
+java-aiplatform$ git diff
+... (shows the generated file differences) ...
+```
+
+This manual confirmation identifies syntax errors in Python scripts and the
+templates.
+
+#### Cloud Build
 This image is built via Cloud Build. From the root of this repository, run:
 
 ```bash
@@ -32,3 +64,21 @@ To rebuild the golden test fixtures:
 1. Delete the `golden` directory.
 2. Copy the `input` directory recursively to `golden`
 3. [Run the latest owlbot image](#running-locally) against the `golden` directory.
+
+### Lint error
+
+When you modify Python scripts, you may encounter lint errors
+Kokoro build:
+
+```
+nox > black --check synthtool tests
+would reformat synthtool/languages/java.py
+
+Oh no! 💥 💔 💥
+1 file would be reformatted, 78 files would be left unchanged.
+```
+
+In this case, install [nox](https://nox.thea.codes/en/stable/) and run
+`nox -s lint` to reproduce the lint problems and `black synthtool` applies
+the suggested formatting.
+

synthtool/gcp/templates/java_library/.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,7 +3,12 @@ name: Bug report
 about: Create a report to help us improve
 
 ---
-
+{% if migrated_split_repo %}
+:bus: This library has moved to
+[google-cloud-java/{{ metadata['repo']['repo_short'] }}](
+https://github.com/googleapis/google-cloud-java/tree/main/{{ metadata['repo']['repo_short'] }}).
+This repository will be archived in the future.
+{% endif %}
 Thanks for stopping by to let us know something could be better!
 
 **PLEASE READ**: If you have a support contract with Google, please create an issue in the [support console](https://cloud.google.com/support/) instead of filing on GitHub. This will ensure a timely response.

synthtool/gcp/templates/java_library/.github/ISSUE_TEMPLATE/feature_request.md

@@ -3,7 +3,12 @@ name: Feature request
 about: Suggest an idea for this library
 
 ---
-
+{% if migrated_split_repo %}
+:bus: This library has moved to
+[google-cloud-java/{{ metadata['repo']['repo_short'] }}](
+https://github.com/googleapis/google-cloud-java/tree/main/{{ metadata['repo']['repo_short'] }}).
+This repository will be archived in the future.
+{% endif %}
 Thanks for stopping by to let us know something could be better!
 
 **PLEASE READ**: If you have a support contract with Google, please create an issue in the [support console](https://cloud.google.com/support/) instead of filing on GitHub. This will ensure a timely response.

synthtool/gcp/templates/java_library/.kokoro/nightly/integration.cfg

@@ -23,7 +23,7 @@ env_vars: {
 
 env_vars: {
   key: "ENABLE_FLAKYBOT"
-  value: "true"
+  value: {% if migrated_split_repo %}"false"{% else %}"true"{% endif %}
 }
 
 env_vars: {

synthtool/gcp/templates/java_library/.kokoro/nightly/java11-integration.cfg

@@ -23,7 +23,7 @@ env_vars: {
 
 env_vars: {
   key: "ENABLE_FLAKYBOT"
-  value: "true"
+  value: {% if migrated_split_repo %}"false"{% else %}"true"{% endif %}
 }
 
 env_vars: {

synthtool/gcp/templates/java_library/.kokoro/nightly/samples.cfg

@@ -34,5 +34,5 @@ env_vars: {
 
 env_vars: {
   key: "ENABLE_FLAKYBOT"
-  value: "true"
+  value: {% if migrated_split_repo %}"false"{% else %}"true"{% endif %}
 }

synthtool/gcp/templates/java_library/README.md

@@ -17,7 +17,14 @@ Java idiomatic client for [{{metadata['repo']['name_pretty']}}][product-docs].
 > Note: This client is a work-in-progress, and may occasionally
 > make backwards-incompatible changes.
 {% endif %}
-
+{% if migrated_split_repo %}
+:bus: In October 2022, this library has moved to
+[google-cloud-java/{{ metadata['repo']['repo_short'] }}](
+https://github.com/googleapis/google-cloud-java/tree/main/{{ metadata['repo']['repo_short'] }}).
+This repository will be archived in the future.
+Future releases will appear in the new repository (https://github.com/googleapis/google-cloud-java/releases).
+The Maven artifact coordinates (`{{ group_id }}:{{ artifact_id }}`) remain the same.
+{% endif %}
 ## Quickstart
 
 {% if 'snippets' in metadata and metadata['snippets'][metadata['repo']['api_shortname'] + '_install_with_bom'] -%}

synthtool/gcp/templates/java_library/renovate.json

@@ -1,5 +1,7 @@
-{
-  "extends": [
+{% if migrated_split_repo %}{
+  "enabled": false,
+{% else %}{
+{% endif %}  "extends": [
     ":separateMajorReleases",
     ":combinePatchMinorReleases",
     ":ignoreUnstable",

synthtool/languages/java.py

@@ -484,7 +484,37 @@ def common_templates(
         excludes (List[str], optional): List of template paths to ignore
         **kwargs: Additional options for CommonTemplates.java_library()
     """
-    kwargs["metadata"] = _common_template_metadata()
+    metadata = _common_template_metadata()
+    kwargs["metadata"] = metadata
+
+    # Generate flat to tell this repository is a split repo that have migrated
+    # to monorepo. The owlbot.py in the monorepo sets monorepo=True.
+    monorepo = kwargs.get("monorepo", False)
+    split_repo = not monorepo
+    repo_metadata = metadata["repo"]
+    repo_short = repo_metadata["repo_short"]
+    # Special libraries that are not GAPIC_AUTO but in the monorepo
+    special_libs_in_monorepo = [
+        "java-translate",
+        "java-dns",
+        "java-notification",
+        "java-resourcemanager",
+    ]
+    kwargs["migrated_split_repo"] = split_repo and (
+        repo_metadata["library_type"] == "GAPIC_AUTO"
+        or (repo_short and repo_short in special_libs_in_monorepo)
+    )
+    logger.info(
+        "monorepo: {}, split_repo: {}, library_type: {},"
+        " repo_short: {}, migrated_split_repo: {}".format(
+            monorepo,
+            split_repo,
+            repo_metadata["library_type"],
+            repo_short,
+            kwargs["migrated_split_repo"],
+        )
+    )
+
     templates = gcp.CommonTemplates(template_path=template_path).java_library(**kwargs)
 
     # skip README generation on Kokoro (autosynth)