[GH1] replace globs with patterns that mergebot can process (#81414)

https://github.com/pytorch/pytorch/pull/81330#issuecomment-1182345751 shouldn't have happened and should have matched the linalg rule.

The reason it happened is cuz we don't treat the patterns like globs.

We may follow this up with a BE change to make the patterns be treated more like globs, which I expected originally.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81414
Approved by: https://github.com/malfet

.github/scripts/test_gitutils.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-from gitutils import PeekableIterator
+from gitutils import PeekableIterator, patterns_to_regex
 from unittest import TestCase, main
 
 class TestPeekableIterator(TestCase):
@@ -22,6 +22,18 @@ class TestPeekableIterator(TestCase):
                 self.assertTrue(iter_.peek() is None)
 
 
+class TestPattern(TestCase):
+    def test_double_asterisks(self) -> None:
+        allowed_patterns = [
+            "aten/src/ATen/native/**LinearAlgebra*",
+        ]
+        patterns_re = patterns_to_regex(allowed_patterns)
+        fnames = [
+            "aten/src/ATen/native/LinearAlgebra.cpp",
+            "aten/src/ATen/native/cpu/LinearAlgebraKernel.cpp"]
+        for filename in fnames:
+            self.assertTrue(patterns_re.match(filename))
+
 
 if __name__ == '__main__':
     main()