From bd42ca1110c0aff7a91bdb5e2077e6d69721f4f8 Mon Sep 17 00:00:00 2001
From: josh <jwpowell055@gmail.com>
Date: Wed, 1 Nov 2017 22:37:17 -0600
Subject: Adding check_bazel_workspace.py to perform a sanity check that the
 external repo dependencies expressed via git submodules and those expressed
 as Bazel WORKSPACE rules agree exactly.

---
 tools/run_tests/sanity/check_bazel_workspace.py | 49 +++++++++++++++++++++++++
 tools/run_tests/sanity/sanity_tests.yaml        |  1 +
 2 files changed, 50 insertions(+)
 create mode 100644 tools/run_tests/sanity/check_bazel_workspace.py

diff --git a/tools/run_tests/sanity/check_bazel_workspace.py b/tools/run_tests/sanity/check_bazel_workspace.py
new file mode 100644
index 0000000000..776c78b03f
--- /dev/null
+++ b/tools/run_tests/sanity/check_bazel_workspace.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+
+# Copyright 2016 gRPC authors.
+#
+# 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.
+
+from __future__ import print_function
+
+import ast
+import os
+import re
+import subprocess
+import sys
+
+os.chdir(os.path.join(os.path.dirname(sys.argv[0]), '../../..'))
+
+git_hash_pattern = re.compile('[0-9a-f]{40}')
+
+# Parse git hashes from submodules
+git_submodules = subprocess.check_output('git submodule', shell=True).strip().split('\n')
+git_submodule_hashes = {re.search(git_hash_pattern, s).group() for s in git_submodules}
+
+# Parse git hashes from Bazel WORKSPACE {new_}http_archive rules
+with open('WORKSPACE', 'r') as f:
+  workspace_rules = [expr.value for expr in ast.parse(f.read()).body]
+
+http_archive_rules = [rule for rule in workspace_rules if rule.func.id.endswith('http_archive')]
+archive_urls = [kw.value.s for rule in http_archive_rules for kw in rule.keywords if kw.arg == 'url']
+workspace_git_hashes = {re.search(git_hash_pattern, url).group() for url in archive_urls}
+
+# Validate the equivalence of the git submodules and Bazel git dependencies. The
+# condition we impose is that there is a git submodule for every dependency in
+# the workspace, but not necessarily conversely. E.g. Bloaty is a dependency
+# not used by any of the targets built by Bazel.
+if len(workspace_git_hashes - git_submodule_hashes) > 0:
+    print("Found discrepancies between git submodules and Bazel WORKSPACE dependencies")
+    sys.exit(1)
+
+sys.exit(0)
diff --git a/tools/run_tests/sanity/sanity_tests.yaml b/tools/run_tests/sanity/sanity_tests.yaml
index 4bc4b7c56f..57292a4f40 100644
--- a/tools/run_tests/sanity/sanity_tests.yaml
+++ b/tools/run_tests/sanity/sanity_tests.yaml
@@ -1,4 +1,5 @@
 # a set of tests that are run in parallel for sanity tests
+- script: tools/run_tests/sanity/check_bazel_workspace.py
 - script: tools/run_tests/sanity/check_cache_mk.sh
 - script: tools/run_tests/sanity/check_owners.sh
 - script: tools/run_tests/sanity/check_sources_and_headers.py
-- 
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