fix: Add fetch for default branch

synthtool/gcp/common.py

@@ -19,6 +19,7 @@
 from copy import deepcopy
 from pathlib import Path
 from typing import Dict, List, Optional
+import requests
 import jinja2
 
 from synthtool import shell, _tracked_paths
@@ -58,6 +59,11 @@ def _generic_library(self, directory: str, **kwargs) -> Path:
 
         t = templates.TemplateGroup(self._template_root / directory, self.excludes)
 
+        if "repository" in kwargs["metadata"] and "repo" in kwargs["metadata"]:
+            kwargs["metadata"]["repo"]["default_branch"] = _get_default_branch_name(
+                kwargs["metadata"]["repository"]
+            )
+
         # TODO: migrate to python.py once old sample gen is deprecated
         if directory == "python_samples":
             t.env.globals["get_help"] = lambda filename: shell.run(
@@ -353,3 +359,10 @@ def _load_repo_metadata(metadata_file: str = "./.repo-metadata.json") -> Dict:
         with open(metadata_file) as f:
             return json.load(f)
     return {}
+
+
+def _get_default_branch_name(repository_name: str) -> str:
+    github_req = requests.get(f"https://api.github.com/repos/{repository_name}")
+    github_req.raise_for_status()
+
+    return github_req.json()["default_branch"]

synthtool/gcp/templates/node_library/.github/workflows/ci.yaml

@@ -1,7 +1,7 @@
 on:
   push:
     branches:
-      - master
+      - default-branch
   pull_request:
 name: ci
 jobs:

synthtool/gcp/templates/node_library/README.md

@@ -25,7 +25,7 @@
 {% endif %}
 
 A comprehensive list of changes in each version may be found in
-[the CHANGELOG](https://github.com/{{ metadata['repo']['repo'] }}/blob/master/CHANGELOG.md).
+[the CHANGELOG](https://github.com/{{ metadata['repo']['repo'] }}/blob/{{metadata['repo']['default_branch']}}/CHANGELOG.md).
 
 {% if metadata['repo']['client_documentation'] %}* [{{ metadata['repo']['name_pretty'] }} {{ metadata['repo']['language']|language_pretty }} Client API Reference][client-docs]{% endif %}
 {% if metadata['repo']['product_documentation'] %}* [{{ metadata['repo']['name_pretty'] }} Documentation][product-docs]{% endif %}
@@ -75,11 +75,11 @@ Google APIs Client Libraries, in [Client Libraries Explained][explained].
 {% if metadata['samples']|length %}
 ## Samples
 
-Samples are in the [`samples/`](https://github.com/{{  metadata['repo']['repo'] }}/tree/master/samples) directory. Each sample's `README.md` has instructions for running its sample.
+Samples are in the [`samples/`](https://github.com/{{  metadata['repo']['repo'] }}/tree/{{ metadata['repo']['default_branch'] }}/samples) directory. Each sample's `README.md` has instructions for running its sample.
 
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
-{% for sample in metadata['samples'] %}| {{ sample.title }} | [source code](https://github.com/{{ metadata['repo']['repo']  }}/blob/master/{{ sample.file }}) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/{{ metadata['repo']['repo'] }}&page=editor&open_in_editor={{ sample.file }},samples/README.md) |
+{% for sample in metadata['samples'] %}| {{ sample.title }} | [source code](https://github.com/{{ metadata['repo']['repo']  }}/blob/{{ metadata['repo']['default_branch'] }}/{{ sample.file }}) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/{{ metadata['repo']['repo'] }}&page=editor&open_in_editor={{ sample.file }},samples/README.md) |
 {% endfor %}
 {% endif %}
 {% if metadata['repo']['client_documentation'] %}
@@ -141,7 +141,7 @@ More Information: [Google Cloud Platform Launch Stages][launch_stages]
 
 ## Contributing
 
-Contributions welcome! See the [Contributing Guide](https://github.com/{{ metadata['repo']['repo'] }}/blob/master/CONTRIBUTING.md).
+Contributions welcome! See the [Contributing Guide](https://github.com/{{ metadata['repo']['repo'] }}/blob/{{ metadata['repo']['default_branch'] }}/CONTRIBUTING.md).
 
 Please note that this `README.md`, the `samples/README.md`,
 and a variety of configuration files in this repository (including `.nycrc` and `tsconfig.json`)
@@ -153,7 +153,7 @@ to its template in this
 
 Apache Version 2.0
 
-See [LICENSE](https://github.com/{{ metadata['repo']['repo'] }}/blob/master/LICENSE)
+See [LICENSE](https://github.com/{{ metadata['repo']['repo'] }}/blob/{{ metadata['repo']['default_branch'] }}/LICENSE)
 
 {% if metadata['repo']['client_documentation'] %}[client-docs]: {{ metadata['repo']['client_documentation'] }}{% endif %}
 {% if metadata['repo']['product_documentation'] %}[product-docs]: {{ metadata['repo']['product_documentation'] }}{% endif %}

synthtool/gcp/templates/node_library/samples/README.md

@@ -45,7 +45,7 @@ Before running the samples, make sure you've followed the steps outlined in
 
 {%- endif %}
 
-View the [source code](https://github.com/{{ metadata['repo']['repo']  }}/blob/master/{{ sample.file }}).
+View the [source code](https://github.com/{{ metadata['repo']['repo']  }}/blob/{{ metadata['repo']['default_branch'] }}/{{ sample.file }}).
 
 [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/{{ metadata['repo']['repo']  }}&page=editor&open_in_editor={{ sample.file }},samples/README.md)
 

tests/test_common.py

@@ -12,14 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synthtool.gcp.common import decamelize
+from synthtool.gcp.common import decamelize, _get_default_branch_name
 from pathlib import Path
 from pytest import raises
 import os
+import requests_mock
 import synthtool as s
 import tempfile
 import shutil
 
+
 MOCK = Path(__file__).parent / "generationmock"
 template_dir = Path(__file__).parent.parent / "synthtool/gcp/templates"
 common = s.gcp.CommonTemplates(template_path=template_dir)
@@ -41,6 +43,14 @@ def test_handles_empty_string():
     assert decamelize("") == ""
 
 
+def test_get_default_branch():
+    with requests_mock.Mocker() as m:
+        m.get(
+            "https://api.github.com/repos/repo_name", text='{"default_branch": "main"}',
+        )
+        assert _get_default_branch_name("repo_name") == "main"
+
+
 def test_py_samples_clientlib():
     path_to_gen = MOCK / "client_library"
     with tempfile.TemporaryDirectory() as tempdir: