Repository: Project-MONAI/MONAI

Issue:
unit test error from `python -m tests.clang_format_utils`
**Describe the bug**
error from `python -m tests.clang_format_utils`
```
2021-11-14 22:26:15,861 - INFO - Downloaded: /__w/MONAI/MONAI/.clang-format-bin/clang-format
2021-11-14 22:26:15,864 - ERROR - check_hash failed 938869fb71b05f5ba345ab36dfbbc4388f53a550.
clang-format: 1.86MB [00:02, 675kB/s]                            
Download /__w/MONAI/MONAI/.clang-format-bin/clang-format failed: sha1 check of downloaded file failed: URL=https://oss-clang-format.s3.us-east-2.amazonaws.com/linux64/clang-format-linux64, filepath=/__w/MONAI/MONAI/.clang-format-bin/clang-format, expected sha1=9073602de1c4e1748f2feea5a0782417b20e3043.
Please remove /__w/MONAI/MONAI/.clang-format-bin/clang-format and retry.
```


Discussion:
Thanks for your report, I also saw this error in PR: https://github.com/Project-MONAI/MONAI/pull/3325/.


Resolving patch:
diff --git a/monai/apps/__init__.py b/monai/apps/__init__.py
--- a/monai/apps/__init__.py
+++ b/monai/apps/__init__.py
@@ -11,4 +11,4 @@
 
 from .datasets import CrossValidation, DecathlonDataset, MedNISTDataset
 from .mmars import MODEL_DESC, RemoteMMARKeys, download_mmar, get_model_spec, load_from_mmar
-from .utils import check_hash, download_and_extract, download_url, extractall, get_logger, logger
+from .utils import SUPPORTED_HASH_TYPES, check_hash, download_and_extract, download_url, extractall, get_logger, logger
diff --git a/monai/apps/utils.py b/monai/apps/utils.py
--- a/monai/apps/utils.py
+++ b/monai/apps/utils.py
@@ -22,7 +22,7 @@
 from urllib.error import ContentTooShortError, HTTPError, URLError
 from urllib.request import urlretrieve
 
-from monai.utils import min_version, optional_import
+from monai.utils import look_up_option, min_version, optional_import
 
 gdown, has_gdown = optional_import("gdown", "3.6")
 
@@ -33,9 +33,10 @@
 else:
     tqdm, has_tqdm = optional_import("tqdm", "4.47.0", min_version, "tqdm")
 
-__all__ = ["check_hash", "download_url", "extractall", "download_and_extract", "get_logger"]
+__all__ = ["check_hash", "download_url", "extractall", "download_and_extract", "get_logger", "SUPPORTED_HASH_TYPES"]
 
 DEFAULT_FMT = "%(asctime)s - %(levelname)s - %(message)s"
+SUPPORTED_HASH_TYPES = {"md5": hashlib.md5, "sha1": hashlib.sha1, "sha256": hashlib.sha256, "sha512": hashlib.sha512}
 
 
 def get_logger(
@@ -117,18 +118,16 @@ def check_hash(filepath: str, val: Optional[str] = None, hash_type: str = "md5")
     Args:
         filepath: path of source file to verify hash value.
         val: expected hash value of the file.
-        hash_type: 'md5' or 'sha1', defaults to 'md5'.
+        hash_type: type of hash algorithm to use, default is `"md5"`.
+            The supported hash types are `"md5"`, `"sha1"`, `"sha256"`, `"sha512"`.
+            See also: :py:data:`monai.apps.utils.SUPPORTED_HASH_TYPES`.
 
     """
     if val is None:
         logger.info(f"Expected {hash_type} is None, skip {hash_type} check for file {filepath}.")
         return True
-    if hash_type.lower() == "md5":
-        actual_hash = hashlib.md5()
-    elif hash_type.lower() == "sha1":
-        actual_hash = hashlib.sha1()
-    else:
-        raise NotImplementedError(f"Unknown 'hash_type' {hash_type}.")
+    actual_hash_func = look_up_option(hash_type.lower(), SUPPORTED_HASH_TYPES)
+    actual_hash = actual_hash_func()
     try:
         with open(filepath, "rb") as f:
             for chunk in iter(lambda: f.read(1024 * 1024), b""):


Test patch:
diff --git a/tests/clang_format_utils.py b/tests/clang_format_utils.py
--- a/tests/clang_format_utils.py
+++ b/tests/clang_format_utils.py
@@ -34,8 +34,8 @@
 # This dictionary maps each platform to a relative path to a file containing its reference hash.
 # github/pytorch/pytorch/tree/63d62d3e44a0a4ec09d94f30381d49b78cc5b095/tools/clang_format_hash
 PLATFORM_TO_HASH = {
-    "Darwin": "b24cc8972344c4e01afbbae78d6a414f7638ff6f",
-    "Linux": "9073602de1c4e1748f2feea5a0782417b20e3043",
+    "Darwin": "1485a242a96c737ba7cdd9f259114f2201accdb46d87ac7a8650b1a814cd4d4d",
+    "Linux": "e1c8b97b919541a99e0a355df5c3f9e8abebc64259dbee6f8c68e1ef90582856",
 }
 
 # Directory and file paths for the clang-format binary.
@@ -58,7 +58,7 @@ def get_and_check_clang_format():
 
     try:
         download_url(
-            PLATFORM_TO_CF_URL[HOST_PLATFORM], CLANG_FORMAT_PATH, PLATFORM_TO_HASH[HOST_PLATFORM], hash_type="sha1"
+            PLATFORM_TO_CF_URL[HOST_PLATFORM], CLANG_FORMAT_PATH, PLATFORM_TO_HASH[HOST_PLATFORM], hash_type="sha256"
         )
     except Exception as e:
         print(f"Download {CLANG_FORMAT_PATH} failed: {e}")
diff --git a/tests/test_check_hash.py b/tests/test_check_hash.py
--- a/tests/test_check_hash.py
+++ b/tests/test_check_hash.py
@@ -41,7 +41,7 @@ def test_result(self, md5_value, t, expected_result):
             self.assertTrue(result == expected_result)
 
     def test_hash_type_error(self):
-        with self.assertRaises(NotImplementedError):
+        with self.assertRaises(ValueError):
             with tempfile.TemporaryDirectory() as tempdir:
                 check_hash(tempdir, "test_hash", "test_type")