Append token to codecov.yml instead of duplicating the file

scripts/append_codecov_token.py

@@ -0,0 +1,36 @@
+"""
+Appends the codecov token to the 'codecov.yml' file at the root of the repository.
+
+This is done by CI during PRs and builds on the pytest-dev repository so we can upload coverage, at least
+until codecov grows some native integration like it has with Travis and AppVeyor.
+
+See discussion in https://github.com/pytest-dev/pytest/pull/6441 for more information.
+"""
+import os.path
+from textwrap import dedent
+
+
+def main():
+    this_dir = os.path.dirname(__file__)
+    cov_file = os.path.join(this_dir, "..", "codecov.yml")
+
+    assert os.path.isfile(cov_file), "{cov_file} does not exist".format(
+        cov_file=cov_file
+    )
+
+    with open(cov_file, "a") as f:
+        # token from: https://codecov.io/gh/pytest-dev/pytest/settings
+        # use same URL to regenerate it if needed
+        text = dedent(
+            """
+            codecov:
+              token: "1eca3b1f-31a2-4fb8-a8c3-138b441b50a7"
+        """
+        )
+        f.write(text)
+
+    print("Token updated:", cov_file)
+
+
+if __name__ == "__main__":
+    main()