1 files changed, 47 insertions, 0 deletions
diff --git a/ci/check_rust_versions.py b/ci/check_rust_versions.py
new file mode 100644
index 00000000..56aac1a4
--- /dev/null
+++ b/ci/check_rust_versions.py
@@ -0,0 +1,47 @@
+# This script checks that the Minimum Supported Rust Version (MSRV) has the same value
+# in several places throughout the source tree.
+
+import re
+import sys
+
+PLACES_TO_CHECK = [
+    ['configure.ac',                     r'MINIMUM_RUST_VER=(.*)'],
+    ['Cargo.toml',                       r'rust-version\s*=\s*"(.*)"'],
+    ['ci/container_builds.yml',          r'RUST_MINIMUM:\s*"(.*)"'],
+    ['devel-docs/devel_environment.rst', r'rust (.*) or later'],
+]
+
+versions = []
+
+for filename, regex in PLACES_TO_CHECK:
+    r = re.compile(regex)
+
+    with open(filename) as f:
+        matched = False
+        for idx, line in enumerate(f.readlines()):
+            matches = r.search(line)
+            if matches is not None:
+                matched = True
+                line_number = idx + 1
+                versions.append([filename, line_number, matches.group(1), line])
+
+        if not matched:
+            raise Exception(f'file {filename} does not have a line that matches {regex}')
+
+assert len(versions) > 0
+
+all_the_same = True
+
+for filename, line_number, version, line in versions[1:]:
+    if version != versions[0][2]:
+        all_the_same = False
+
+if not all_the_same:
+    print(f'Version numbers do not match in these lines, please fix them!\n', file=sys.stderr)
+
+    for filename, line_number, version, line in versions:
+        print(f'{filename}:{line_number}: {line}', file=sys.stderr)
+
+    sys.exit(1)
+
+print(f'Versions number match.  All good!', file=sys.stderr)