Add a check to ensure that version.bzl and MODULE.bazel remain in syn…

…c. (#697)

* add MODULE.bazel

* Add a check to ensure that version.bzl and MODULE.bazel remain in sync.

MODULE.bazel

@@ -1,6 +1,6 @@
 module(
     name = "rules_pkg",
-    version = "0.9.0",  # Must sync with version.bzl.
+    version = "0.10.0",  # Must sync with version.bzl.
     repo_name = "rules_pkg",
     compatibility_level = 1,
 )

distro/BUILD

@@ -87,6 +87,7 @@ py_test(
     data = [
         "testdata/BUILD.tpl",
         ":distro",
+        "//:standard_package",
     ],
     local = True,
     python_version = "PY3",

distro/packaging_test.py

@@ -15,6 +15,7 @@
 """Test that the rules_pkg distribution is usable."""
 
 import os
+import re
 import subprocess
 import unittest
 
@@ -34,6 +35,24 @@ def setUp(self):
     self.dest_repo = 'not_named_rules_pkg'
     self.version = release_version.RELEASE_VERSION
 
+  def testVersionsMatch(self):
+    """version.bzl must match MODULE.bazel"""
+    module_bazel_path = self.data_files.Rlocation(
+          'rules_pkg/MODULE.bazel')
+    with open(module_bazel_path, encoding="utf-8") as inp:
+      want = 'version = "%s"' % self.version
+      content = inp.read()
+      if _VERBOSE:
+        print('=== Expect', want)
+      module_block_re = re.compile
+      m = re.search(
+          r"""module\([^)]+\)""",
+          content,
+          flags=re.MULTILINE|re.DOTALL)
+      self.assertTrue(m)
+      got = m.group()
+      self.assertIn(want, got, 'Expected <%s>, got <%s>' % (want, got))
+
   def testBuild(self):
     # Set up a fresh Bazel workspace using the currently build repo.
     tempdir = os.path.join(os.environ['TEST_TMPDIR'], 'build')

version.bzl

@@ -13,4 +13,4 @@
 # limitations under the License.
 """The version of rules_pkg."""
 
-version = "0.9.0"
+version = "0.10.0"